JP3484793B2 - Electrolytic water generation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to the electrolysis of tap water and the like.
Continuous generation of alkaline ionized water and acidic ionized water
Electrolytic water generation methodToIt is about. [0002] 2. Description of the Related Art Conventionally, electrolytic water generation as shown in FIG.
An apparatus is provided. This is a filter medium 31 made of activated carbon.
Water purifier 3 provided with a filter medium 32 formed of a hollow fiber membrane
And the electrolytic cell 2. In the electrolytic cell 2, two kinds of
Arranged with electrodes 21 and 22 separated by electrolytic diaphragm 20
Have been. A switching unit attached to a tap water faucet 99
The water sent from the knit 98 to the water purifier 3 is inside the water purifier 3
DC voltage is applied to the electrodes 21 and 22
Is sent to the electrolytic cell 2 which has been
And alkaline ionized water on the side of the electrode that is the cathode,
Acidic ion water is generated on the side of the electrode serving as the anode.
Of the two types of ionized water, the main use water (generally used for drinking)
Is discharged from the outlet 23.
The secondary use water (acid ion water) is discharged from the discharge port 24 to the drain port.
64. The voltage applied to the electrodes 21 and 22 of the electrolytic cell 2 is
The start of the application connects the switching unit 98 and the water purifier 3.
Pressure detection having a diaphragm 68 installed in a water channel
Switch PS. In addition, water purifier 3 and electricity
The water channel connecting with the tank 2 is connected to the drain port 64.
But the ball valve 66 is closed by water pressure
Then, the water heading for the electrolytic cell 2 flows directly to the drain 64.
I can't wait. [0005] The water supply from the switching unit 98 is stopped.
If the pressure detection switch PS is turned off, the electrolytic cell 2
Current to the electrodes 21 and 22 is cut off,
The water in tank 2 is open because there is no water pressure difference
The water is discharged to a drain port 64 through a ball valve 66. This
Here, in the above, the electrolytic water actually discharged
To confirm the pH value of the sample, a simple analysis using a reagent
It is necessary to perform electrolysis water at the required pH value.
In order to obtain, it is not necessary to adjust the set voltage and flow rate manually.
Including the time required to check the pH value,
It is not possible to reliably obtain electrolyzed water with the required pH value
Was. To this end, the pH value of the electrolytic water to be discharged is continuously adjusted.
This pH sensor is provided with a pH sensor for continuous measurement.
The pH value obtained from the
The feedback control of the electrolysis voltage applied to the
DevisedI have. [0007] [0008][Problems to be solved by the invention] In this one, Minera
When electrolyzed water with a large amount of water is used to obtain electrolyzed water,
When getting ionized waterToThere was a problem. In other words, calcium
Water that contains a lot of mineral components
To obtain weakly acidic ionic water by electrolyzing such water.
Is much lower than for normal water.
Pressure can produce ionized water with the desired pH value.
You. Such a unique water is obtained from a pH sensor.
By comparing the measured pH value with the target pH value, the
When the feedback control is performed, the preset electrolytic voltage-
Because of the large deviation from the pH characteristic curve,
Overshoot occurs and does not converge to the target pH value.
The indicated pH value may fluctuate. The present invention has been made in view of the above points.
And its purposeWhereFor water with high conductivity
Control the electrolysis voltage without causing overshoot.
To provide a method for producing electrolyzed water. [0010] SUMMARY OF THE INVENTION The present invention provides an electrolysis
Alkaline ionized water and acidic ionized water by electrolysis in a tank
In generating and discharging each of these electrolyzed waters, pH
Electrolysis according to the pH value of electrolyzed water measured by the sensor
In the method of generating electrolyzed water that controls the electrolysis voltage applied to the tank
To the target pH value of the pH value obtained from the pH sensor.
DeviationΔpHIs obtained, and a previously set electrolytic voltage −p
The above deviation from H characteristicFind the voltage difference ΔV corresponding to ΔpH
The voltage difference ΔV was subtracted from the current voltageThe voltage to be applied next
The solution voltage and the above-mentioned electrolysis voltage-pH characteristics
And measured the electrolytic voltage-pH characteristics by changing the applied voltage of the electrolytic cell.
The voltage value for the above deviation is smaller than the
It is characterized by having [0011] [0012] According to the present invention, the detected pH value is adjusted to the target pH value.
In bundling,of the pH value obtained from the pH sensor
The deviation ΔpH from the target pH value is determined and set in advance.
From the electrolysis voltage-pH characteristic
Find the difference ΔV and subtract the voltage difference ΔV from the current voltage
Next, the electrolysis voltage to be applied and the above electrolysis voltage-
Electrolysis measured by changing the voltage applied to the electrolytic cell as pH characteristics
The voltage value for the above deviation is smaller than the voltage-pH characteristic.
Use somethingMay cause overshoot
Not something. [0013] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Then, as shown in FIG.
Tank 2, backwash unit 4, switching valves 5, 6, and flow rate adjustment
Valve 65, pH sensor 7, calcium agent addition cylinder 80, etc.
Configured as housed in a housing (not shown)
I have. The electrolytic cell 2 has two types of cells, as in the conventional example.
Poles 21 and 22 and an electrolytic diaphragm 20 separating them
With inlets 25 and 26 at the bottom and discharge at the top
Ports 23 and 24, and these discharge ports 23 and 24
Are connected to the discharge pipes 17 and 18 via the switching valve 6.
You. Here, the inflow port 25 and the discharge port 23
An inflow port 26 and a discharge port 24 communicate with a space surrounding the electrode 21.
Is in communication with the space surrounding the other electrode 22
However, the inlet 25 is narrower than the inlet 26,
The flow rate flowing into the electrode 21 side is the flow rate flowing into the electrode 22 side.
The ratio of 1: 3 to 1: 4
I have. Further, the switching valve 6 includes a discharge port 23, a discharge pipe 17,
When the discharge port 24 and the discharge pipe 18 are connected,
When the discharge port 23 and the discharge pipe 18 communicate with each other, the discharge port
If there is an electromagnetic rotary valve that connects the discharge pipe 17 with the
Or a motor-operated switching valve. The water purifier 3 includes a filter medium 31 made of activated carbon and a medium.
And a filter medium 32 made of a hollow fiber membrane.
One of the two openings provided is a backwash unit
The other end is connected to a switching valve 5. Note that the above
The two filter media 31, 32 are contained in a single cartridge.
And is configured so that the entire cartridge can be replaced.
I have. The backwashing unit 4 includes a filter medium 3 in the water purifier 3.
By passing the clogging of 1,32 once through the water purifier 3
By performing backwashing to make the filtered purified water flow back to the water purifier 3
This is to eliminate the cylinder as shown in FIG.
40, a piston 41 disposed in the cylinder 40,
While slidably engaging with the stone 41,
The valve body 43 is pulled against the spring 45 as the
It consists of an interlocking pin 42 for lowering the cylinder 40
A port 46 leading to the water purifier 3 and a valve
Opened when the valve 43 goes down and closed when the valve 43 goes up
A discharge port 44 is provided.
The space below the piston 41 is formed by the port of the switching valve 5 described below.
Port 55. Attached below the backwash unit 4
The switching valve 5 has ports 51 and 54 at both ends.
And three ports on the circumferential surface that are offset in the axial direction
52, 53, and 55, and a movable body 56 built in
Move by the pressure of the water that selectively flows in from ports 51 and 54
As a result, communication between the ports 51 and 52 shown in FIG.
In addition, the ports 55 and 53 form the outer peripheral space 57 of the movable body 56.
When the movable body 56 moves to the right in the drawing,
Between the ports 54 and 55 and the outer peripheral space.
The communication between the ports 52 and 53 through 57 is disconnected.
Replace it. It should be noted that what is connected to the water purifier 3 is
The port 52 is connected to the drain pipe 19, and the port 53 is connected to the drain pipe 19.
ing. Also, ports 51 and 54 are provided in faucet 99.
Connected to the switching unit 98, and disconnected from the port 51.
A flow control valve 65 is provided between the switching unit 98 and the switching unit 98.
You. Constant flow valve 6 arranged between port 52 and water purifier 3
4 prevents excess water pressure from being applied to the water channel after the water purifier 3.
It is provided for stopping. Ports 51 and 5
4 is connected to the switching unit 98.
A power supply box containing a power supply
Is in contact with the lower surface of the box 70 via a heat dissipation plate.
Also, this contact part is made of metal such as copper or aluminum
It is formed of a tube. Cooled by water supplying the power supply
So that the power supply can be safe from overheating.
Is increasing the character. The discharge port 44 of the backwash unit 4
Is connected to the inlets 25 and 26 of the electrolytic cell 2 by a pipe 47.
The pipe 47 has a flow meter
66, a check valve 67 and a solenoid valve 63 are provided,
An arrangement for separately connecting the solenoid valve 63 and the inlets 25 and 26 described above.
Among the pipes, the above-mentioned calcium
A humor agent addition cylinder 80 is provided. The check valve 67 is
It is connected to the drain port 19 and the water pressure is on the pipe 47 side.
Is closed when it is closed, but there is no water pressure on the pipe 47 side
When it is no longer open, open the water in the electrolytic cell 2 and the pipe 47.
Is discharged from the drain 19. In the middle of the discharge pipe 18, a pH sensor 7 is provided.
Are arranged. Here, as the pH sensor 7,
Now, as shown in FIG. 5, a saturated KCl or NaCl solution
Electrode and a silver-silver chloride electrode and a saturated KCl solution
It consists of a working electrode part consisting of a liquid and a special glass electrode.
Is proportional to the hydrogen ion concentration of the ionic water to be measured using
To amplify the electromotive force generated between both electrodes,
As shown in FIG. 5 (b), a voltage of 0 to 5 V according to the pH value is applied.
And the output voltage is A / D
After the conversion, it is taken into a control circuit C described later. The electrolyzed water generating apparatus thus formed is
As described above, the two ports 5 in the switching valve 5
1, 54 are connected to the switching unit 98 via individual piping
Is done. This switching unit 98 is operated by lever operation.
Stop the water supply to the electrolyzed water generator and
Switching between water supply and water supply to port 54 side
It was made possible. Next, the flow of water when taking out the electrolyzed water will be described.
To explain, in the switching unit 98, water is switched to a switching valve.
5 to the port 51 side, the port in the switching valve 5
The water that has reached the position 51 is moved by the movable body 56
In order to press, as shown in FIG.
It entered the water purifier 3 and was filtered by the filter media 30 and 31
After that, it reaches the port 46 of the backwash unit 4. And port
Water entering the cylinder 40 of the backwash unit 4 from 46
Presses down the piston 41 first with water pressure,
The discharge port 44 closed by the valve body 43 is opened, and this
The inflow port 25 of the electrolytic cell 2 through the pipe 47 from the discharge port 44,
From 26, it enters the electrolytic cell 2 and is electrolyzed here. In addition,
The energization of the electrolytic cell 2 depends on the flow rate arranged in the middle of the pipe 47.
The process is started based on the information on the flow rate obtained from the total 66. And an instruction to obtain alkaline ionized water.
Is performed, the electrode 21 of the electrolytic cell 2 becomes the anode,
Since an electrolytic voltage is applied so that the electrode 22 becomes a cathode,
Then, acidic ionized water is supplied to the discharge port 23 side, and
Lucari ionized water is obtained, and at this time, the switching valve 6 is shown in FIG.
The alkaline ionized water is discharged
On the 18 side, the acidic ion water is discharged to the discharge pipe 17 side. Instructed to obtain acidic ionized water
The next two waters depending on the indicated acidity
It becomes a flow. First, in the case of weakly acidic ionic water, electrolytic cell 2
Electrode so that electrode 21 becomes the cathode and electrode 22 becomes the anode
Since the voltage is applied, the alkali ion
As a result, acidic ionized water is obtained at the discharge port 24 side.
At this time, since the switching valve 6 is in the same state as the above,
Acid ionized water is discharged to the discharge pipe 17 side
It is discharged to the pipe 18 side. In the case of strongly acidic ionic water, the voltage of the electrolytic cell 2 is
Electrolysis voltage so that pole 21 is the anode and electrode 22 is the cathode
Is applied, acidic ionized water is provided on the discharge port 23 side,
Alkaline ionized water is obtained at the discharge port 24 side.
The switching valve 6 is in a state different from the above two states as shown in FIG.
To be switched, the alkaline ionized water is discharged from the discharge pipe 17.
The acidic ion water is discharged to the discharge pipe 18 side. this
To discharge the strongly acidic ionic water from the discharge pipe 18 side
In this case, the electrode 21 side is used as the anode, as described above.
The inlet 25 on the electrode 21 side is defined as the inlet 26 on the electrode 22 side.
Squeezed to reduce the inflow, strongly acidic ions
This is because it is easy to obtain water. Then, in the switching unit 98, the water is
If it flows to the port 54 side of the switching valve 5, the movable body by water pressure
With the movement of 56, the switching valve 5 is switched, and from the port 54
The entered water is passed through port 55 to backwash unit 4.
Flows into the space below the piston 41, and pushes the piston 41.
The discharge port 44 is closed by the valve 43 and
The filtered water that has accumulated in the space above the stone 41
The water flows backward from the port 46 to the water purifier 3. This backflow water
Backwash the filter media 32, 31 and adhere to the filter media 32, 31
After washing away the impurities, the port 52 of the switching valve 5,
It is discharged from the drain 19 through 53. At this time,
The inflow of water from the switching unit 98 is sent to the backwash unit 4.
Ends when piston 41 is moved to top dead center
I do. Then, at the time of such backwashing or the switching unit 98,
When the water is stopped in, the water in the electrolytic cell 2 has a water pressure difference
Drain port 1 through check valve 67 which is open because there is no
It is discharged from 9. FIG. 1 is a block diagram of the electrolyzed water generator.
Circuit diagram, in which C is a one-chip microcomputer.
The control circuit, which is composed of
A power supply unit D is an operation display unit. pH sensor 7
The control circuit C to which the flowmeter 66 is connected includes the electrolytic cell 2
The electrolytic voltage applied to the electrodes 21 and 22 of the
Configured so that it can be controlled by PWM control
And the target pH value and the value obtained from pH sensor 7.
Of electrolyzed water being discharged through the discharge pipe 18 to the pH value
A comparison circuit C1 is built in, and the detected pH value is equal to the target pH value.
Feedback control of the electrolytic voltage
U. The low resistance value inserted into the power supply section DV
The comparator CP to which the voltage across the resistor R is input is connected to the resistor CP.
Depending on the voltage drop at the anti-R, the magnitude of the current
For comparison, the current supplied to the electrodes 21 and 22
When the voltage exceeds the upper limit specified according to the applied voltage,
Outputs an overcurrent detection signal to the control circuit C,
In the control circuit C, the voltage applied to the electrodes 21 and 22 decreases.
Thus, the voltage drop instruction signal is output to the power supply section DV. Power supply
To prevent the DV from generating excessive heat.
is there. FIG. 6 shows an example of the display operation section D. Operation unit
As the power switch SW₁In addition, a pH switch
Switch_Two, SW_Three, SW_Four, Reset switch SW_Five, P
Switch SW for fine adjustment of H₇In addition to electrolysis
Switch to turn on / off the sound
Switch₉Of the water purifier 3 integrated in the control circuit C
Switch SW for resetting the operation time_TenAnd life setting S
W₁₁, Switch SW for cleaning pH sensor 7₁₂,
SW₁₃It has. The above switch SW₉Turn off the notification means by
Corresponds to discharge of alkaline ionized water from the discharge pipe 18.
Only to be effective. In other words, acid ions
When water is discharged from the discharge pipe 18, the switch SW
₉Even if is turned off, the notification means operates and the melody and
A warning is issued by a buzzer. Currently spitting
Outgoing water is acidic ionic water and not suitable for drinking
This is to inform the user of the fact. For similar reasons, acid
From the state of discharge of alkaline ionic water to the state of discharge of alkaline ionic water
Is changed to p, the value measured by the pH sensor 7 is p
Until H8 is exceeded or a predetermined flow rate (for example, 1
000 ml) is discharged or a predetermined time elapses
Beep until the alarm
When switching from the on-water discharge state to the purified water discharge state
Is until the pH sensor 7 no longer outputs acidity.
Or for 10 seconds or until the specified flow rate is discharged
It keeps sounding the warning. Further, the electrode 2
Alkaline ion water or
Also sounds a warning when switching to the clean water discharge state
Is preferred. Switch SW₁₂, SW₁₃PH sensor
Cleaning of scale 7 removes the scale deposited on pH sensor 7.
It is done for leaving. That is, an alkali having a pH of 10 or more
If there is too much carbonic acid, such as in deionized water, especially groundwater,
Bicarbonate ion HCO_Three ^-More carbonate ion CO_Three ^2-Existence
In this case, the ratio of
More phenomena appear. The pH of the scale is
When the sensing part of the sensor 7 is covered, the pH sensor 7
Sensing accuracy (especially on the acidic side)
Responsiveness becomes worse. To address this point
Perform washing. Details will be described later. As shown in FIG.
In addition, as a display unit, the pH value obtained by the pH sensor 7 is
Display section La for displaying numbers, switch SW_Two, S
W_Three, SW_FourDisplay section Ld for displaying the selection state of₁~ Ld₇,
Display L indicating that the electrodes 21 and 22 are being cleaned
e, a display unit L for prompting replacement of the filter media 31 and 32 of the water purifier 3
f, Display Lp urging cleaning of pH sensor 7, power supply status
Display section L indicating₁Etc. are provided. The display unit Le displays an operation display.
The cleaning of the electrodes 21 and 22 is performed according to the scale generated on the electrodes 21 and 22.
This is for removing water and water is detected by the flow meter 66.
When notified, the electrodes 21 and 22 of the electrolytic cell 2
Performed by applying a voltage of opposite polarity for a short time
However, at the start of this cleaning, the solenoid valve 63 is closed.
For this purpose, backwashing is performed in a stagnant system. Anode at this time
The pH value on the side is increased to about pH 2 by retaining water.
Calcium carbonate or carbonated mud attached to become acidic
The cesium component can be dissolved and removed. Ma
In the latter half of the backwash, the solenoid valve 63 is opened.
For this reason, backwashing in a flowing water system is also performed.
Thus, complete electrode cleaning can be expected. In addition, this
Water containing scale that was in electrolytic cell 2 at the time of washing
Is discharged from the inlets 25 and 26 through the drain 19.
Washing water mixes at the next use
Never. The operation display section D as described above is provided.
The power switch SW₁If you enter
Indicator L₁Lights up, and in this state the switch SW_TwoIf you press
"Pure water" or "1 to 4" level depending on the number of presses
(Level 4 is shown as "strong alkali" in the figure)
And the selected state is displayed on the display Ld. _Three
~ Ld₇And the switching unit 98
If water is pumped through, the selected action is taken. S
Switch_Three"Purified water" can also be instructed by
Is selected, the display unit Ld_ThreeIs lit
And no electrolytic voltage is applied to the electrolytic cell 2
Therefore, the water was purified by the water purifier 3 from the discharge pipe 18.
Water is discharged, and the flow rate and pH value of the water at this time are displayed.
It is displayed on the indicator La. Alkali ion of any of Levels 1 to 4
When water is selected, the flow meter 66
Therefore, the application of the electrolysis voltage is started, and at this time,
The control circuit C includes a discharge pipe 18 obtained from the pH sensor 7.
The pH value of the electrolyzed water discharged from the
The electrolysis voltage is adjusted so that the target pH value is set in advance.
Feedback control is performed. As the target pH value,
For example, pH 9.0 for level 1, pH 9.5 for level 2,
PH 10.0 for level 3 and p for level 4 (strongly alkaline)
A value such as H10.5 is set. Detected
The pH value is indicated by a numeral on the display section La. Switch SW_FourIf you press
Therefore it can be used as astringent water
Display that indicates selection of weakly acidic ionic water
Ld _TwoIndicates that the selection of strongly acidic ionic water has been made
Display section Ld₁And alternately light up, and
A target pH value according to the obtained electrolytic strength is set. here
Then, in the case of weakly acidic ionized water, set the target pH value to 5.8,
In case of strongly acidic ionic water, set the target pH value to 3 ~ 2
Then, the target pH value acidic ion water is discharged to the discharge pipe 18.
The feedback control of the electrolytic voltage is performed as described above. The flow path for weakly acidic ionic water is shown in FIG.
As shown in Fig. 3, the flow path for strongly acidic ionic water is shown in Fig. 3.
It is as described above, and the flow
By switching between them, that is, strongly acidic ionic water
Reducing the flow rate to the obtained anode electrode 21 side
To make it possible to obtain strongly acidic ionic water
I have. Next, details of the feedback control will be described.
If you specify, feedback based on the following algorithm
Control. That is, the target pH value is set to pHM.
Then, as shown in FIG. 7, it is set in advance according to the target pH value.
Voltage Vm is obtained from the pH sensor 7.
Until the output stabilizes. Here, the fluctuation range
Is stable within ± 0.1 pH for 2 seconds
And Then, the pH value p at the above stable point
The deviation ΔpH between the HA and the target pH value pHM was determined, and FIG.
Shown voltage-pH (pH sensor output voltage) characteristic table
Vn (Vn = Vm-Δ) corresponding to the deviation ΔpH from
V) is obtained and this voltage Vn is applied. Such an application
Adjust the voltage until the deviation ΔpH is within ± 0.2 pH.
Every time the output obtained from the pH sensor 7 stabilizes.
U. And when the deviation ΔpH falls within ± 0.2 pH
, The applied voltage at that time is maintained as it is. Due to disturbances such as a change in the flow rate, the pH
Is fluctuated and becomes stable when the deviation ΔpH reaches the target pH value.
When the voltage exceeds ± 0.2 pH, the voltage-pH
Find the voltage corresponding to the deviation ΔpH from the characteristic table.
Deviation of ΔpH within ± 0.2 pH
Repeat until fit in. Thus feedback control
When performing the above, it can be inferred from the pH value change shown in FIG.
It is almost impossible to cause so-called overshoot
Therefore, the time required to converge to the target pH value is short.
In particular, the deviation ΔpH is stable as described above.
From the deviation ΔpH.
The correction of the applied voltage is usually 1 unless there is disturbance.
Times, and in this regard the goal
The time required for convergence to the pH value is short. Further, when the target pH values are different,
When I want to obtain Lucari ion water and when I get weakly acidic ion water
And when you want to obtain strongly acidic ionic water,
Side reactions during electrolysis (eg oxidation of chlorine ions
Etc.), the reaction time differs,
For each standard pH value (here, alkaline ionized water and weakly acidic ions
Water and strongly acidic ionized water for each mode)
Prepare a voltage-pH characteristic table, and
Feedback control. The curve a shown in FIG.
For alkaline ionized water, b for weakly acidic ionic water, c for strong acid
For ionic water. P for voltage change of target pH value
Why is control suitable for the rising characteristics of H change?
What is the target pH value for this purpose?
Also quickly converges the pH value of the discharged electrolytic water to the target pH value
Electrolysis of the desired pH value
Water can be obtained reliably and quickly. Note that these
The voltage-pH characteristic table (curves a, b, c) of pHv = A + Blog_eV (PHv is pH sensor output voltage, V is electrolytic voltage, A,
B can be represented by an approximate expression of a constant that differs for each mode).
Wear. By the way, such feedback control
In order to prevent excessive heat generation of the power supply unit DV,
The voltage exceeding the preset upper limit of the electrolytic cell current
It is necessary to take measures when electrolytic voltage
Control circuit that receives an overcurrent detection signal.
The road C lowers the electrolytic voltage by one step every predetermined time.
Outputs instructions. Here, the predetermined time is, for example, 8
Switching in response to the above instruction in contrast to msec
The responsiveness of the power supply section DV as the power supply is
One step every 256msec due to the effect of the condenser
Or the output voltage cannot be reduced,
When the control circuit C receives the overcurrent detection release signal,
Reduce the electrolytic voltage to an unnecessary value for the switching power supply
Command has been issued.
The electrolytic voltage at which the current just below the current value flows cannot be applied, and
As a result, electrolyzed water with a pH value far from the target pH value is discharged.
Will be. For this reason, here, the electrolytic cell current is overcurrent.
The control circuit C, which has received the signal indicating that
In response to the voltage drop instruction, the voltage drop rate at the power supply unit DV
It is output according to. That is, the power supply unit D
V decreases the output voltage by one step every 256 msec.
If the output voltage can be controlled, the control circuit C
Instruction to power supply unit DV to lower by one step
Is output every 256 msec. Therefore,
Overshoot also occurs when controlling overcurrent detection.
And the electrolysis voltage at the full upper limit current value
It can be added. Output power of power supply unit DV
After the voltage drop is confirmed, the next voltage drop instruction signal is output
Of course, it may be done. Regarding prevention of overshoot,
Unique with high conductivity and easy current flow like groundwater
When electrolyzing water, keep the following points in mind.
Not be. In other words, the weakly acidic ions
In the case of obtaining water, in the case of those shown in the above examples, 1 to 1
Obtaining pH 4-6 ionic water with an electrolysis voltage of about 5V
Is possible, whereas ordinary water is about 30V.
Electrolysis voltage is required. For this, Astrinzent
In the mode, set in advance for general water
Based on a certain electrolysis voltage-pH characteristic formula,
Water that has a high rate and shows weak acidity with a small applied voltage
Is performed, the deviation Δ is obtained as shown in FIG.
Fluctuation width ΔV of applied voltage to pH₁Really need
Fluctuation width ΔV_TwoIs too large compared to
May cause fluctuations in the displayed pH value.
And In order to avoid this, here the deviation ΔpH
Variation of applied voltage ΔV₁Is shown in FIG. 9 (b).
Thus, the fluctuation width ΔV in the actual water characteristic curve E_Two
Smaller than. In this case, the fluctuation is within ± 0.1 pH.
When the stable state continues for 10 seconds or more, the voltage value at this time and p
Write the H value to the memory of the control circuit C
I have. The value written to this memory is
This voltage value is referenced immediately when water is
Is applied. Convergence time to target pH value after resumption of water flow
It will be faster. The above memory is
Is rewritten each time the condition is satisfied. In advance for each target pH value
The set voltage value may be rewritten. By the way, when the water is stopped, the water in the electrolytic cell 2 is drained.
Since it is watered, start water flow from this state
Even if the electrolytic cell 2 is filled with water, the pH sensor 7
It takes time to reach. The target pH value changes during the passage of water
When the water in the electrolytic cell 2 is replaced to some extent
take time. Therefore, immediately after the start of water flow, pH
The output of the sensor 7 does not change,
Such a time zone is called a dead zone (area indicated by K in FIG. 7).
If the above control is performed even in this dead zone,
The ionic water corresponding to the voltage has not reached the pH sensor 7.
At a stable point to derive the above correction value
There is a risk of spilling. For this purpose, the feedback system
The following dead zone processing is also performed. That is, when water is started from the water stop state,
As for the case, as shown in FIG.
Of the voltage Vm preset according to the target pH value
Is started and the output of the pH sensor 7 is displayed.
However, a predetermined time T1 (for example, 15
Seconds), feedback control is not performed until
The voltage Vm is maintained. And after T1 time has passed
Depending on whether the pH value has changed by 0.2 pH in the target direction.
To determine whether or not the player has escaped from the dead zone.
After that, the difference between the above-mentioned stable point for 2 seconds and the target pH value at that time
Feedback by deviation and voltage-pH characteristic table
To enter the lock control mode. Change of target pH value during water flow
Is the voltage corresponding to the new target pH value for this change.
Immediately start application of Vmn and pH sensor
7 is displayed, but a predetermined time T2 has elapsed since the change.
(For example, 3 seconds) until the feedback system
The voltage Vmn is maintained without performing control. And at T2
After a lapse of time, the pH value changed by 0.2 pH in the desired direction
To determine if you have escaped the dead zone,
After the escape is confirmed, the above feedback control mode
I'm going to enter. In order to escape the dead zone, the pH value was adjusted in the desired direction.
Is determined only by whether or not pH has changed by 0.2 pH.
If the pH change is slight for some reason,
When there is no change above H, the feedback control mode
Is not allowed to enter the
It is desirable to add it. As this judgment part,
A time longer than the predetermined times T1 and T2
It may be an immer, but for example, 0.2 liters of water
Is forcibly escaped and the feedback control
In this case, the feedback
Entering the lock control mode without waiting for the judgment of stability
It is advisable to make a correction by comparing the pH at the point of. When discharging acidic ionized water
The water used is rich in carbonic acid like groundwater
The basic carbonate Ca (HCO_Three)_Two, Mg
(HCO_Three)_Two, NaHCO_ThreeEtc. are produced, but pH
When discharging weakly acidic ionic water of about 5.0 to 6.0,
PH value of weakly acidic ionic water is detected by pH sensor 7
And the basic carbonate was dissolved in the weakly acidic ionic water.
Sometimes, it is detected because it has the property of showing weak alkalinity
The pH value becomes alkaline and stable after water discharge.
When the state becomes
Acid H_TwoCO_ThreeIs slightly acidic because it dissociates again
There's a problem. In other words, even though we can obtain weakly acidic ionic water
Nevertheless, the pH to check the pH of ion water during discharge
To output the result of alkaline in sensor 7
However, for water containing a lot of carbonic acid,
When such feedback control is performed, the desired pH value
This means that ionic water cannot be obtained. For this reason, here, weakly acidic ionized water is
If it is determined that the pH value detected during the control is pH7.
If it exceeds 0, it is determined that the groundwater is rich in carbonic acid
To force the pH display to the set value (5.8 here)
From the above judgment at the rate of 0.1pH / 0.5sec
It is made to shift. If you explain in detail, weak acid
Uses groundwater rich in carbonic acid to generate ionic water
In this case, as shown in FIG.
When a certain constant voltage Va corresponding to the value is continuously applied,
The pH sensor 7 once indicates a value near the target pH value.
However, after 2 to 30 seconds, the actual pH value
Despite being between 5.0 and 6.0,
Shows the alkaline value. For this purpose, the pH sensor 7 has a pH of 7.0.
The operation of determining whether or not the above
From the still water state to the discharge mode of weakly acidic ionic water
At the time of shifting, the predetermined time T described with respect to the dead zone
During 1, the application of a preset voltage is started,
The feedback control is not performed and the output of the pH sensor 7 is displayed.
Although the indication is made, a predetermined time (for example, 2
0 seconds), the pH has exceeded 7.0.
No judgment is made. As mentioned above, the above time
Is reliable even if it exceeds pH 7.0
This is because it cannot be determined. From the time when the above time has elapsed, the pH
If the pH sensor 7 outputs a value exceeding 7.0,
Determined to be groundwater and the electrolysis voltage remains at the voltage at the time of determination
The value is fixed at 0.1 pH / 0.
Shift at a rate of 5 seconds. When the pH does not exceed 7.0
Is determined to be city water, and the
Control is continued according to the solution voltage-pH characteristic equation. Note that the voltage
-As a pH characteristic equation, pHv = 2.5-αlog_eV (α: Depends on flow rate
Constant). From the discharge state of water of another pH value,
When the mode is switched to the water discharge mode, the time T1
Dead zone treatment is 15 seconds, and after that, it is weakly acidic
As in the case of shifting to the ionized water discharge mode, the pH sensor
Judge whether the output from Sir 7 exceeds pH 7.0
Control. Top in Weakly Acidic Ion Water Discharge Mode
By performing the above-mentioned judgment every time, it is possible to cope with fluctuations in water quality.
Keep it. Next, the cleaning of the pH sensor 7 will be described.
You. In the feedback control using the pH sensor 7,
The accuracy and rise characteristics of the pH sensor 7 are always constant
It is expected that there will be some
Accuracy is reduced due to precipitation of
Responsiveness also worsens. For this purpose, the following
The state of the pH sensor 7 is checked for the reason. That is, the setting in the RAM in the control circuit C is
For the applied voltages V1 to V8 in the specified flow rate range
The following table describes the output voltage VSii of the H sensor 7.
Such a reference table is stored. Value to be stored here
After the required flow rate (for example, 300 liters)
The same electrolysis voltage during pH control when the reference table is empty
Is output continuously for a certain period of time (for example, 30 seconds)
The electrolytic voltage and the output voltage of the pH sensor 7 at that time
VSii is written in the corresponding column. The processing of the above dead zone
The dead times T1 and T2 for
Not included in the event. [0057] [Table 1]As described above, the columns satisfying the conditions are described.
After writing sequentially, the integrated flow rate is 1000-2
If it reaches 000 liters
Using the comparison between the current and the output voltage of the pH sensor 7
Do it every time. Note that comparisons are made in empty areas in the reference table.
Do not do. In addition, writing to empty areas is comparatively open.
Perform it after the start. By comparison, a certain flow rate range
Output voltage of the pH sensor 7 at a given electrolytic voltage
Is compared to the electrolysis voltage VSii in the corresponding column on the reference table.
The specified value, for example, when discharging acidic ionized water
+ 0.3V, ± 0.3 when discharging alkaline ionized water
When the voltage V deviates, the display unit Lp is turned on and the pH sensor 7
Encourage cleaning. The washing of the pH sensor 7 is performed by the switch S
W₁₂, SW₁₃(Switch SW₁₂Prompts cleaning
The switch can be operated only when the display unit Lp is lit.
SW ₁₃Indicates that operation is possible even when the display section Lp is not lit.
), The solenoid valve 63 is closed and the switching valve is
6 to the state shown in FIG.
7 and plug the calcium-added cylinder 80
Acid solution is poured for a predetermined amount,
Perform by leaving it for a while. Through the electrolytic cell 2 and the switching valve 6
The citric acid solution reaching the pH sensor 7
Dissolve the scale attached to -7. of course,
Adhered in the flow path from the electrolytic cell 2 to the pH sensor 7
Dissolve the scale. After the above neglect, for example
Just pass water for several tens seconds to several minutes in the purified water output mode
And because citric acid has very high solubility, wash it off
Can be lost. The reason for plugging the discharge pipe 17 is as described above.
Citric acid solution discharge pipe 1
This is to prevent the water from flowing out of the nozzle 7. Calciu
The injection of the citric acid solution from the cylinder 8
It is good to use equipment and push it in. The citric acid may be in the form of a powder.
In this case, the electromagnetic valve 63 may be connected to the water purifier 3 even when closed.
Use a type that can supply water to the electrolytic cell 2 from the
After the citric acid powder is put in the lucium addition cylinder 8, the faucet 99
30 seconds by operating the switching unit 98 (500 to 10
(00 ml), and the citric acid powder is
To dissolve. Citric acid has a high dissolution rate,
Descaling no different from using acid solution
It can be performed. In the flow path from the electrolytic cell 2 to the pH sensor 7
No descaling is required, and only pH sensor 7 is washed.
If cleaning is enough, remove the tip of the discharge pipe 18
At a position higher than the pH sensor 7, the discharge pipe 18
Then, a citric acid solution may be poured. Also,
Cartridge containing filter media 31 and 32 in water container 3
In addition to preparing a washing cartridge separately,
The cleaning cartridge is filled with a filter medium 31 that is activated carbon.
About 50-100 g of citric acid powder
Before cleaning the pH sensor 7, use the water purifier 3
Replace this cartridge with this cleaning cartridge
Together with the discharge pipe 17 and switch SW₁₂, SW₁₃
Electrolysis from water purifier 3 side even when closed by pressing any of
Close the solenoid valve 63 that can supply water to the tank 2
After passing water for a while, leave it for a predetermined time.
You may. In this case, the switching valve 6 is switched to the state shown in FIG.
No change is necessary. When using the cartridge of the water purifier 3,
In addition to being able to use more citric acid,
Adding citric acid to all the water sent to digester 2
Groundwater that is rich in calcium and carbonic acid
This is effective when using. Note that here,
Citric acid was used for the dissolution of the scale
Foods such as acid, fumaric acid, oxalic acid, formic acid, and maleic acid
Any organic acid certified as an additive may be used. [0063] As described above, in the present invention, detection p
In converging the H value to the target pH value,pH sensor
Deviation ΔpH of the pH value obtained from
From the previously set electrolysis voltage-pH characteristics.
A voltage difference ΔV corresponding to the difference ΔpH is determined and the voltage difference ΔV
The voltage obtained by subtracting the difference ΔV is used as the electrolysis voltage to be applied next.
In addition, as the above-mentioned electrolytic voltage-pH characteristics,
To the above deviation from the measured electrolytic voltage-pH characteristic
Use the one with the smaller voltage valueTo over
It does not cause shoots and the displayed pH value fluctuates.
The divergence phenomenon can be prevented. [0064]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram of one embodiment. FIG. 2 is a schematic diagram showing the discharge of alkaline ionized water or weakly acidic ionized water according to the first embodiment. FIG. 3 is a schematic view showing the same when strongly acidic ionic water is discharged. FIG. 4 is a sectional view of a backwash unit and a switching valve according to the first embodiment; FIGS. 5A and 5B show the same pH sensor as the above, wherein FIG. 5A is a schematic sectional view and FIG. 5B is an output characteristic diagram. FIG. 6 is a front view of the operation display unit of the above. 7 is an operation explanatory view showing the algorithm of the feedback control of the same. FIG. 8 is a voltage-pH characteristic diagram at the time of feedback control according to the first embodiment. 9A is a voltage-pH characteristic diagram in a comparative example, and FIG. 9B is a voltage-pH characteristic diagram in the present invention. FIG. 10 is an explanatory diagram of an operation of the dead zone processing of the above energy management system. FIG. 11 is an explanatory diagram of an operation for determining groundwater according to the first embodiment. FIG. 12 is a flowchart showing the operation of the above. FIG. 13 is a schematic view of a conventional example. [Description of Signs] C control circuit DV power supply unit 2 electrolytic cell 7 pH sensor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihisa Hirai 1048 Kadoma Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. References JP-A-5-64785 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/46

Claims (1)

(57) [Claims 1] The pH value of electrolyzed water measured by a pH sensor when alkaline ionized water and acidic ionized water are generated by electrolysis in an electrolyzer and the electrolyzed water is discharged separately. In an electrolyzed water generation method for controlling an electrolysis voltage applied to an electrolytic cell according to a measurement result of
A deviation ΔpH of the value from the target pH value is determined, and the deviation ΔpH equivalent to the deviation ΔpH is determined from a preset electrolytic voltage-pH characteristic .
The voltage difference ΔV was obtained, and the voltage obtained by subtracting the voltage difference ΔV from the current voltage was used as the electrolysis voltage to be applied next, and the electrolysis voltage-pH characteristic was measured by changing the electrolysis cell applied voltage. A method for producing electrolyzed water, characterized in that a material having a smaller voltage value with respect to the deviation than the electrolysis voltage-pH characteristic is used.