JPH07195078A - Current detecting circuit of electrolytic device - Google Patents

Abstract

PURPOSE:To detect the electrolysis current of an electrolytic device with high accuracy and to reduce the production cost of a current detecting circuit by amplifying the voltage across a resistor interposed between an electrolytic power source and an electrolytic cell and detecting the electrolytic current from the output voltage thereof. CONSTITUTION:The electrolytic cell 25 is disposed with a positive electrode and a negative electrode across an electrolytic diaphragm in an electrolytic chamber into which water to be electrolyzed is introduced. Besides, the electrolytic power source 30 supplies the electrolytic voltage to both electrodes of the electrolytic cell 25. At this time, a resistor 3 is interposed between the negative electrode side and cathode electrode of the electrolytic power source 30. The input side of a voltage amplifier 4 is connected to both ends of the resistor 3. Further, the analog voltage outputted from the voltage amplifier 4 is converted by an A/D converter 5 to a digital value. The current value flowing in the resistor 3 is calculated by a calculating means 1 in accordance with the voltage value of an A/D converter 5 and the resistance value of the resistor 3. As a result, the electrolytic current is detected with high accuracy and the production cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolyzer for electrolyzing electrolyzed water to generate alkaline ionized water and strongly acidic water, and more particularly to detecting an abnormality on the electrolysis power source side by a load current in an electrolyzer. The present invention relates to a current detection circuit of an electrolysis device.

[0002]

2. Description of the Related Art When tap water or other raw water is electrolyzed in an electrolytic cell, alkaline ionized water is produced from the cathode side of the electrolytic cell and acidic water is produced from the anode side. When decomposed, strong acidic water having bactericidal power can be generated. Such an electrolyzer is known as an alkaline ionized water producing device when drinking alkaline ionized water, and is also known as a strongly acidic water producing device when using strongly acidic water for medical treatment.

This type of electrolyzer usually comprises an electrolyzer, an electrolysis power source, a controller and the like as main parts. The electrolyzer comprises an anode chamber and a cathode chamber separated by a diaphragm. An anode is arranged in the anode chamber and a cathode is arranged opposite to the cathode chamber. The electrolysis power source is connected to a positive electrode and a negative electrode, and a DC voltage is applied to both electrodes based on a control signal from a control unit to electrolyze water introduced into the electrolytic cell. There is.

Further, this electrolysis apparatus is equipped with an ammeter and a shunt in order to detect the current supplied to the electrolysis cell to know the electrolysis state. This shunt is a shunt resistance with the internal resistance of the ammeter and is generally known as a shunt resistance, and is provided between the electrolytic cell and the electrolytic power source.

As for this shunt resistor, for example, in a general popular type model in which an electrolytic current is used in a range of 0 to 50 A, a resistor having a resistance value of about 1 mΩ is used in view of the shunt ratio with the internal resistance. The voltage across the shunt resistor is set to 0 to 50 mV depending on the supply current during electrolysis. This output voltage is converted into a digital signal by an A / D converter and then given to the control unit. In this controller, the current value is calculated from the voltage value of the digital signal and the known resistance value of the shunt resistor. As a result, the electrolysis current during electrolysis can be detected, and the electrolysis state can be known.

[0006]

By the way, for this type of electrolysis device, it is necessary to use an electrolysis device having a relatively large shunt resistance of 1 mΩ and high accuracy because of the relationship of the shunt ratio to the internal resistance used for current detection. For this reason, conventionally, a resistor made of manganese has been used, but this manganese is expensive, and there is a drawback that the manufacturing cost of the electrolysis device cannot be reduced.

The present invention was devised to solve the above problems, and an object thereof is to provide a current detection circuit for an electrolysis device which can detect an electrolysis current with high accuracy and at a low manufacturing cost. It is in.

[0008]

In order to solve the above problems, a current detection circuit of an electrolysis apparatus according to the present invention has a positive electrode and a negative electrode with an electrolytic diaphragm interposed between them in an electrolysis chamber into which water to be electrolyzed is introduced. The electrolytic cell, an electrolytic power source for applying an electrolytic voltage to the both electrodes, a resistor interposed between the negative electrode side of the electrolytic power source and the negative electrode, and an input side connected to both ends of the resistor. A voltage amplifier, and an A / D converter for converting an analog voltage output from the voltage amplifier into a digital value,
The present invention is characterized by comprising an arithmetic means for calculating a current value flowing through the resistor from the voltage value from the A / D converter and the resistance value of the resistor.

[0009]

With the above structure, when electrolyzed water is introduced into the electrolytic cell and an electrolysis voltage is applied from the electrolysis power source to both electrodes of the electrolytic cell, electrolysis of the electrolyzed water starts. At this time, an electrolytic current flows through a resistor connected between the negative electrode side of the electrolysis power source and the negative electrode, and a voltage appears across the resistor. This analog voltage is amplified by a voltage amplifier, then converted into a digital signal by an A / D converter, and given to a calculation means.
The calculation means calculates a current value from the voltage value indicated by the digital signal and the known resistance value of the resistor. Therefore, the electrolytic current can be detected and the state of electrolysis can be known. By using the voltage amplifier in this way, the electrolytic current can be detected by amplifying the voltage across the resistor,
As the resistor, a conductive material having a resistance value as low as possible can be used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a strongly acidic water generator to which the electrolyzer according to the present invention is applied.

This electrolyzer electrolyzes mixed water obtained by adding salt water to tap water, and vibrio parahaemolyticus, resistant Staphylococcus aureus (M
It is applied to a strong acid water generator that generates strong acid water used for sterilizing liquids such as RSA), and a mixture liquid storage tank 20, a metering pulse pump 22, an electrolysis tank 25, an electrolysis power source 30, and a generated water storage are provided in the main body of the device not shown. The tank 36, the generated water discharge pump 38, the current detection circuit 2, the control unit 1, and other main parts are accommodated.

Water supply pipe 12 for introducing tap water from the water pipe
In addition, an electromagnetic water supply valve 13 and a flow meter 16 are provided. An electrolytic cell 25 is connected to the outlet side of the flow meter 16 via a thermometer 19, and a discharge pipe 24 from the mixed liquid storage tank 20 is connected to the outlet side of the check valve 23. The mixed solution storage tank 20 stores a high-concentration saline solution necessary for producing strongly acidic water, and this saline solution is mixed with tap water by a metering pulse pump 22 for adjusting the discharge amount. It has become.

The electrolytic cell 25 comprises an anode chamber 25a and a cathode chamber 25b separated by a diaphragm 26. An anode 27 is placed in the anode chamber 25a, and a cathode 28 is placed opposite to the cathode chamber 25b. There is. Tap water or mixed water is introduced into the electrolytic cell 25 from the water supply pipe 12 connected to the lower inlet. Drain pipes 31 and 32 are connected to the upper side outlets of the anode chamber 25a and the cathode chamber 25b, respectively, so that strongly acidic water generated by electrolysis of mixed water is electromagnetically three-wayed via the drain pipe 31. The alkaline ionized water is discharged through the drain pipe 32 and the external drain pipe 34 while being sent to the valve 33 side.

The anode 27 is connected to the positive terminal of the electrolytic power source 30, and the cathode 28 is connected to the negative terminal of the electrolytic power source 30 via the resistor 3. This electrolysis power source 30 uses both of the electrodes 27 of the electrolysis tank 25 as a constant DC voltage for electrolysis.
28 is applied. The resistor 3 is
Current detection circuit 2 together with amplifier 4 and A / D converter 5
Make up.

One of the outlet sides of the electromagnetic three-way valve 33 is connected to the external drainage pipe 34, and the other of the outlet sides thereof extends to the produced water storage tank 36 via the drainage pipe 35. This electromagnetic three-way valve 33 normally produces a strongly acidic water and a water storage tank 36.
The strong acid water from the electrolytic cell 25 is stored in the produced water storage tank 36.

The produced water storage tank 36 is provided with a liquid amount detection sensor 37 for detecting the stored amount of produced water and a discharge pump 38. The discharge pump 38 discharges the generated water from the generated water storage tank 36 and discharges the generated water from the generated water storage tank 36 through the drain pipe 39.
It is designed to send water to the side.

The control unit 1 has a CP (not shown).
A microcomputer including U, ROM, and RAM, which controls the operation of the entire apparatus and monitors the electrolysis state of the electrolysis tank 25 and the abnormality of the electrolysis power supply 30 based on the output signal from the current detection circuit 2. It is configured. The CPU of the control unit 1 includes an A / D converter 5, an ammeter 10, an indicator lamp 11, an electromagnetic water supply valve 13, a flow meter 16, a thermometer 19, a liquid amount sensor 21, a metering pulse pump 22, an electrolysis power source 30. The electromagnetic three-way valve 33, the liquid amount sensor 37, the discharge pump 38, etc. are connected in one direction or in both directions according to their functions.

FIG. 2 is an electrical block diagram of the current detection circuit. In this current detection circuit 2, the input side of an amplifier 4 is connected to the connection points a and b at both ends of the resistor 3, and the output side of this amplifier 4 is connected to the control section 1 via an A / D converter 5. The current flowing through the resistor 3 is detected during energization.

The resistor 3 uses, as a material, a wire that does not easily generate heat even when a large current flows during electrolysis of strong electrolyzed water with an increased current load and maintains a predetermined stable resistance value Ra. This wire may be a commercially available copper wire cut into a suitable length.

The amplifier 4 is a non-inverting voltage amplifier in which the signal voltage on the input side that matches the polarities of the electrolytic cell 25 and the electrolytic power source 30 is not inverted on the output side, and greatly amplifies the voltage across the resistor 3. It is configured to let.

That is, in the amplifier 4, the inverting input terminal is connected to the negative terminal of the electrolytic power source 30 via the connection point a, and the non-inverting input terminal is connected to the terminal portion of the cathode 28 via the connection point b. Has been done. An input resistor 6 whose one end is grounded is connected to a connection point c on the non-inverting input terminal side, and one end of a feedback resistor 7 whose other end is connected to an output side terminal d of the amplifier 4 is connected. There is.

As a result, from the electrolysis power source 30 to the electrolysis tank 25
When a constant DC voltage is supplied to the negative electrode, an electrolytic current flows between the negative terminal of the electrolysis power source 30 and the cathode 28 side of the electrolytic cell 25 through the resistor 3, and the resistance is applied to both ends of the resistor 3. Value R
The voltage Vi, which is the product of a and the current value I, appears, and the amplifier 4
Given to the input side of.

The amplifier 4 has a resistance value R of the resistor 3.
Since the amplification factor is determined by a and the resistance value Rf of the feedback resistor 7, the input voltage Vi from the output side of the amplifier 4 is determined.
The voltage Vo that is Rf / Ra times the output voltage is output. The analog output voltage Vo is converted into a digital signal by the A / D converter 5 and sent to the control unit 1.

In the control section 1, the current value is calculated based on the output voltage Vo and the known resistance values Ra and Rf to derive the electrolytic current I. In this example, the resistance value Ra of the resistor 3 is 1 mΩ, and the voltage V
When i is output in the range of 0 to 50 mV, the amplifier 4
The output voltage Vo is set to 0 to 5V. Therefore, the control unit 1 can accurately calculate the electrolytic current flowing through the resistor 3 at 0 to 50A.

The control unit 1 sends the detected current value to the ammeter 10 to display the current value. Also,
When a current exceeding 50 A is detected, it is determined that the current is an overcurrent, the electrolysis power supply 30 is turned off, an abnormality alarm signal is sent to the display lamp 11, and the abnormality is informed by blinking this lamp. Furthermore, the control unit 1
Determines whether the above-mentioned output voltage is 0V or 5V after starting electrolysis, and when 0V, it is determined that the electrolysis power supply 30 is abnormal and the indicator lamp 11 is made to blink.

That is, this electrolysis apparatus is constructed so that a control signal is sent from the control section 1 to the electrolysis power supply 30 to drive the electrolysis power supply 30 to supply a DC electrolysis voltage to the electrolysis cell 25. However, if the breaker of the electrolysis power supply 30 is turned off for some reason or the fuse is blown in the case of a switch, the electrolysis power supply 30 does not operate even though the control signal is correctly sent. Therefore, the electrolytic voltage is not supplied to the electrolytic cell 25 and the electrolysis is not started.

However, the current detection circuit 2 of the present embodiment makes it possible to know the supply state of the electrolysis voltage by constantly monitoring the output voltage, so that the conventional problem can be avoided and a failure or the like can be left for a long time. The problem such as being done is solved. Further, since the current detection circuit 2 amplifies a minute voltage by using the non-inverting voltage amplifier, the resistance value of the resistor 3 can be made as small as 1 mΩ, and as described above, the structure is simple and inexpensive but reliable. A flexible wire can be used.

The case of using the above electrolysis apparatus will be described. First, the user activates an operation unit (not shown). Then, the control unit 1 causes the electromagnetic water supply valve 13
Turn on to start the introduction of tap water,
Drive. Along with this, a DC voltage is applied from the electrolysis power source 30 to both electrodes 27, 28 of the electrolytic cell 25.

Next, the control unit 1 rotationally drives the pulse motor to feed salt water from the mixed liquid storage tank 20 to the mixer 17 side by the constant pulse pump 22 to add it to tap water. When this mixed water flows into the electrolytic bath 25, strong electrolytic treatment is performed. In this example, the pH before electrolysis is around 7 and the residual chlorine concentration is 0.3 to 0.8 ppm in tap water, the pH after electrolysis is around 2, and the redox potential is 1100 to 1400 mV and residual chlorine. Concentration is 20 ~
It became 50 ppm.

After that, the strongly acidic water generated on the side of the anode chamber 25a is discharged to the side of the electromagnetic three-way valve 33, and the alkaline ionized water generated on the side of the cathode chamber 25b passes through the external drain pipe 35 to a faucet (not shown). Water is sent. On the other hand, the strongly acidic water is guided from the electromagnetic three-way valve 33 to the produced water storage tank 36 side, is sent to the produced water storage tank 36, and is sequentially stored. When the faucets 8 and 9 are opened, the control unit 1
The discharge pump is driven to discharge the generated water from the generated water storage tank 36 and discharge it from the faucets 8 and 9. As a result, the user can take in both the alkaline ionized water and the strongly acidic water and can use them without waste.

[0031]

The current detection circuit of the electrolysis apparatus according to the present invention amplifies the voltage across the resistor interposed between the electrolysis power source and the electrolysis cell, and detects the electrolysis current from this output voltage. You can know the state properly. In addition, since the resistor can adopt a conductive material having a resistance value as low as possible,
In this type of electrolysis device, it is not necessary to use a highly accurate and expensive electrolysis device, and there is an effect that an inexpensive electrolysis device having a simple structure can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an electrolysis device according to an embodiment of the present invention.

FIG. 2 is an electrical block diagram of a current detection circuit of the electrolyzer.

[Explanation of symbols]

 1 computing means 3 resistor 4 voltage amplifier 5 A / D converter 25 electrolysis tank 25a anode chamber 26 electrolytic diaphragm 27 positive electrode 28 negative electrode 30 electrolytic power supply

Claims (1)

[Claims] 1. An electrolytic cell in which a positive electrode and a negative electrode are arranged with an electrolytic diaphragm sandwiched in an electrolytic chamber into which electrolyzed water is introduced, an electrolytic power source for applying an electrolytic voltage to the both electrodes, and a negative electrode of the electrolytic power source. Side interposed between the negative electrode and the negative electrode, a voltage amplifier having an input side connected to both ends of the resistor, and an A / D for converting an analog voltage output from the voltage amplifier into a digital value. Current detection of an electrolysis device, comprising: a converter; and an arithmetic means for calculating a current value flowing through the resistor from the voltage value from the A / D converter and the resistance value of the resistor. circuit.