JPH1080686A - Strong acidic water generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong acidic water generating device capable of obtaining a strong acidic water having constantly stable quality with the efficient use of a raw water and discharging the strong acidic water from a fixed discharge port. SOLUTION: This device is provided with a polarity switching means for reversely changing an impressing voltage to each electrode in an electrolytic cell 4, three-way valves 15, 16 for selectively communicating a 1st flow-out pipe line 13 and a 2nd flow-out pipe line 14 with one of the strong acidic water discharge port or a strong alkaline water discharge port, an ORP sensor 17 provided in the flow-out pipe line communicated at least with the strong acidic water discharge port and for detecting oxidation-reduction potential(ORP) of a water passing through the flow-out pipe line, a setting means for setting to a desirable oxidation-reduction potential of the water at the flow-out pipe line communicated with the strong acidic water discharge port and a control unit 12 for controlling the quantity of a salt water feeding to a city water so that the oxidation-reduction potential detected by the ORP sensor 17 becomes the desirable oxidation-reduction potential.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strongly acidic water producing apparatus for producing strongly acidic water by electrolyzing raw water (tap water) mixed with an electrolytic solution such as a saline solution in an electrolytic cell. .

[0002]

2. Description of the Related Art In recent years, attention has been focused on washing and disinfecting hands or medical instruments with strong acidic water having a high bactericidal effect as one means of preventing hospital-acquired infections in hospitals. Such strongly acidic water is generated by adding and mixing an electrolytic solution such as a saline solution to tap water as raw water, and electrolyzing the mixed water in an electrolytic cell.

[0003] When the above-mentioned strongly acidic water is used for sterilization and disinfection, particularly in the medical field,
It is necessary to always maintain a stable water quality, but this water quality is constantly fluctuated due to the amount of electrolytic solution to be added, the consumption of electrodes or the adhesion of metal salts in the electrolytic cell, and the change in the flow rate of raw water. It is extremely difficult to stably obtain desired water quality.

Conventionally, a proposal for obtaining a strongly acidic water having a constant composition is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-328639. In this proposal, a flow meter for measuring the flow rate of raw water or discharge water is provided to control the flow rate of raw water or discharge water to a predetermined fixed amount. On the basis of the detection, when the ORP of the electrolytic discharge water is out of the predetermined range, the valve is switched to the drain pipe side to control the drainage.

[0005]

However, in the configuration disclosed in the above publication, the detection signal of the ORP sensor is used only for controlling the discharge valve of the electrolytic discharge water, and the flow rate of the discharge water is controlled. The control is not performed to maintain a constant water quality at all times, and when the oxidation-reduction potential value does not reach a predetermined value, the electrolytic discharge water is always connected to the discharge side. Therefore, there is a problem that a large amount of waste water is generated. Further, in this conventional configuration, since the discharge side of the electrolytic cell is separated into a conduit for anode water and a conduit for cathode water, a DC voltage is applied to each electrode of the electrolytic cell to perform electrolysis. In such a case, the precipitated impurities adhere to the respective electrodes, so that electrolysis becomes impossible. To avoid this, the polarity of the applied voltage is reversed to remove the adhered impurities. However, if the polarity is reversed, the discharge ports of the strongly acidic water and the strongly alkaline water will be reversed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to always obtain highly acidic water of stable water quality without wasting raw water, and to obtain strongly acidic water from a fixed discharge port. It is an object of the present invention to provide a strongly acidic water generator capable of discharging water.

[0007]

Means for Solving the Problems and Functions / Effects In order to achieve the above object, a strongly acidic water generating apparatus according to the present invention comprises electrolyzing a mixed water of tap water and an electrolytic solution in an electrolytic cell. (A) the polarity of switching the anode chamber and the cathode chamber of the electrolytic cell by reversing the voltage applied to each electrode of the electrolytic cell. Switching means, (b) selectively communicating the first outlet pipe and the second outlet pipe connected to the outlet of the electrolytic cell with either the strong acid water outlet or the strong alkaline water outlet. (C) an ORP sensor provided at least in an outflow pipe communicating with the strong acid water discharge port and detecting an oxidation-reduction potential of water passing through the outflow pipe; (d) the strong acid water discharge In the outlet line communicating with the outlet Setting means for setting a desired oxidation-reduction potential value, and (e) oxidation-reduction controlling the oxidation-reduction potential value detected by the ORP sensor to maintain the desired oxidation-reduction potential value set by the setting means. It is characterized by comprising potential value maintaining means.

In the present invention, the oxidation-reduction potential of the water in the outflow conduit for discharging the strongly acidic water from the electrolytic cell is detected by the ORP sensor, and the detected value is used as the desired oxidation-reduction potential set by the setting means in advance. When the potential is equal to or higher than the potential value, the oxidation-reduction potential value is controlled to decrease, and when the potential is equal to or lower than the desired oxidation-reduction potential value, the oxidation-reduction potential value is controlled to increase. In this way, it is possible to always obtain a strongly acidic water of stable water quality without wasting raw water. In the present invention, since the electrolytic cell is used by reversing the voltage applied to each electrode by the polarity switching means, the apparatus can be used repeatedly while removing impurities adhered to the electrodes due to the polarity reversal. Can be improved. Also, at the time of this polarity switching, by operating the electromagnetic switching valve to connect the anode chamber of the electrolytic cell to the strong acid water discharge port,
Strongly acidic water can be discharged from a constantly constant discharge port.

In the present invention, the means for maintaining the oxidation-reduction potential value may be a means for maintaining the oxidation-reduction potential value by controlling the amount of the electrolytic solution injected into the tap water, or the means for maintaining the oxidation-reduction potential value. The oxidation-reduction potential value may be maintained by controlling the supply amount, or the oxidation-reduction potential value may be maintained by controlling the power supplied to the electrolytic cell. Further, maintaining the oxidation-reduction potential value by simultaneously controlling any two or three of the injection amount of the electrolytic solution into the tap water, the supply amount of the tap water, and the power supplied to the electrolytic cell. It may be.

[0010] In the present invention, furthermore, strongly acidic water and strong alkaline water respectively discharged from the first outflow pipe and the second outflow pipe are mixed to discharge water close to neutral water. Is preferably provided. By doing so, it is possible to obtain neutral water having a bactericidal effect by setting together with the strongly acidic water, and it is possible to obtain water suitable for the intended use without waste water.

In the present invention, it is preferable that the desired oxidation-reduction potential value set by the setting means can be changed according to the use of the strongly acidic water. By doing so, the oxidation-reduction potential value of the obtained strongly acidic water is
For example, it can be easily changed according to the usage such as whether it is used for washing and disinfecting hands, or for washing and disinfecting medical instruments and the like and environmental disinfection, thereby further improving convenience.

Further, in the present invention, it is preferable that an EEPROM for storing the accumulated use time of the electrolytic cell is further provided. In this way, the stored integrated time can be used as a measure of the replacement time of the electrolytic cell.
In this case, the stored contents are not erased even when the power is turned off or the backup battery is exhausted as compared with the case where the data is stored in the RAM, so that an accurate integrated time can be obtained. In this way, deterioration of water quality due to the life of the electrolytic cell can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a strongly acidic water generating apparatus according to the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a system configuration diagram of a strongly acidic water generator according to a first embodiment of the present invention, and FIG. 2 shows a control block diagram of the strongly acidic water generator of the present embodiment. It is shown.

In the strongly acidic water generator 1 of the present embodiment, an aspirator 6 is provided in the supply pipe 5 from the tap water supply port to the electrolytic cell 4 through the solenoid valve 2 and the pressure reducing valve 3. Tap water is mixed by the aspirator 6 with a saline solution as an electrolytic solution supplied from a salt water tank 7 by a pulse pump 8, and the mixed water is supplied to the electrolytic cell 4. A flow sensor 9 for detecting the flow rate of tap water is interposed on the downstream side of the pressure reducing valve 3, and a water temperature sensor 10 for detecting the temperature of the mixed water on the downstream side of the aspirator 6. Is inserted.
Further, the salt water tank 7 is provided with an empty sensor 11 for detecting that the salt water is empty by detecting the level of the salt water in the salt water tank 7.

The electrolytic cell 4 has an anode chamber and a cathode chamber separated by a diaphragm. Electrodes provided in each chamber are connected to a positive terminal or a negative terminal of an electrolytic power source, respectively, so that a constant DC voltage is supplied. It is configured that the mixed water is electrolyzed by being applied to each electrode. Further, the electrolysis power supply is configured to be able to invert the polarity in accordance with a control signal from a control unit 12 constituted by a microcomputer, and also to be able to change the power supplied to the electrodes.

The discharge port of the electrolytic cell 4 is connected to two outflow pipes consisting of a first outflow pipe 13 and a second outflow pipe 14. Each of these outflow pipes 13 and 14 is three-way. It is configured to selectively communicate with either the strong acid water discharge port or the strong alkaline water discharge port via the electromagnetic valves 15 and 16. Further, a KCl non-supply type OR is provided in an outflow pipe on the strong acid water discharge port side of the three-way solenoid valves 15 and 16.
The P sensor 17 is interposed, and the OR of generated water
P (redox potential) is detected.

The pulse pump 8, the solenoid valve 2, the three-way solenoid valves 15 and 16, and the switching power supply 18 of the electrolytic cell 4.
The electromagnetic switch 19 is controlled by a control signal from the control unit 12 via the bus 20. As data for calculating this control signal, the control unit 12 includes a power switch 2 of an operation panel.
1, the operation switch 22, the detection data of the flow rate of tap water from the flow rate sensor 9, the empty data of the salt water tank 7 from the empty sensor 11, the water temperature data of the mixed water from the water temperature sensor 10, and the water generated from the ORP sensor 17. ORP (redox potential) data etc.
Is entered via This control unit 12
Is a CPU (Central Processing Unit) that executes a predetermined program
23, a working memory required to execute this program, and a memory 24 for storing various data, and an EEPROM 25 as an external storage device.

In this embodiment, in order to maintain the quality of the strongly acidic water discharged from the strongly acidic water discharge port always constant, the OR of the generated water detected by the ORP sensor 17 is maintained.
The pitch number of the pulse pump 8 is feedback-controlled so that the P value (oxidation-reduction potential) falls within a range of a preset reference value. Next, a control procedure of such a pulse pump will be sequentially described with reference to a flowchart shown in FIG.

A1 to A2: Based on the input signal from the flow sensor 9, when the flow rate is normal, a control signal is transmitted to the switching power supply 18 and the electromagnetic switch 19 of the electrolytic cell 4 so as to start electrolysis. I do. On the other hand, if the flow rate is not normal, error processing is performed. A3: Immediately after the start of operation of the device, the three-way solenoid valve 1
By switching between 5 and 16, the generated water flowing out to both the first outflow line 13 and the second outflow line 14 is discharged to the strong alkaline water discharge port side.

A4 to A9: The detection value of the ORP sensor 17 is read, and when the read value is equal to or less than a predetermined lower limit (for example, 1000 mV), the pitch number of the pulse pump 8 for supplying saline is increased. Thus, the supply amount of the saline solution is controlled to be increased. Also,
When the read value exceeds the lower limit value and is equal to or higher than the upper limit value (for example, 1100 mV), the pitch number of the pulse pump 8 is reduced to reduce the supply amount of the saline solution.
In these cases, that is, when the detection value of the ORP sensor 17 is outside the desired appropriate range, both the strongly acidic water and the strongly alkaline water are discharged from the strongly alkaline water discharge port.
On the other hand, when the read value of the ORP sensor 17 exceeds the lower limit value and is less than the upper limit value, in other words, when the read value is within an appropriate range for maintaining the desired water quality, the strong acidity from the first outflow line 13 The three-way solenoid valves 15 and 16 are switched so that water is discharged to the strongly acidic water discharge port and strongly alkaline water from the second outflow pipe 14 is discharged to the strongly alkaline water discharge port. The oxidation-reduction potential value of the strongly acidic water detected by the ORP sensor 17 is displayed on the display unit 27 of the operation panel 26 as shown in FIG.

A10: If the control for increasing or decreasing the pitch number of the pulse pump 8 is continuously executed even after the time set by the timer elapses, it is recognized as an error and error processing is performed.

With the above-described pulse pump control,
Strongly acidic water having a stable water quality can always be obtained without wasting raw water. In this embodiment, the water quality (oxidation-reduction potential value) of the strongly acidic water can be switched between two levels by the generated water adjustment switch 28 of the operation panel 26. With such a configuration, the oxidation-reduction potential value can be easily changed according to the intended use, for example, whether it is used for washing and disinfecting hands or used for washing and disinfecting medical equipment and the like.

In the strongly acidic water generating apparatus 1 of this embodiment, the operating time of the electrolytic cell 4 during the operation of the apparatus is measured by a timer (not shown), and the measuring time is a predetermined time (for example, 30 minutes). After the elapse, the anode and the cathode of the electrolytic cell 4 are switched, and the three-way solenoid valves 15 and 16 also supply the strongly acidic water from the second outflow pipe 14 to the strongly acidic water discharge port and the first outflow pipe. Switching is performed so that the strong alkaline water from the passage 13 is discharged to the strong alkaline water discharge port. Since the voltage applied to each electrode is used in this way, the apparatus can be used repeatedly while removing impurities attached to the electrodes. Even if the polarity is reversed in this way, the three-way solenoid valves 15 and 16 are switched in conjunction with the reversal, so that the strong acid water can always be discharged from a constant discharge port.

The integrated use time of the electrolytic cell 4 is E
When the accumulated time reaches the time preset as the life of the electrolytic cell 4, for example, 5000 hours, it is stored in the EPROM 25, and is notified to a user as a standard for replacement of the electrolytic cell 4. In this way, the accumulated use time is E
If the data is stored in the EPROM 25, the stored content will not be lost even when the power is turned off or the backup battery is exhausted, as compared with the data stored in the RAM, so that an accurate integrated time can be obtained. In this way, deterioration of water quality due to the life of the electrolytic cell can be prevented.

Further, in the present embodiment, a switching valve and a return path are provided in the flow path from the salt water tank 7 to the pulse pump 8 to release the salt water to the salt water tank 7 side when bleeding air. Thereby, it is configured such that the occurrence of a trouble due to the air being contained in the saline solution is avoided. With such a configuration, generation of waste water can be minimized, and running costs can be reduced.

In this embodiment, the three-way solenoid valve 1
5 and 16 are switched so that the first outflow pipe 13 and the second outflow pipe 14 communicate with the strong alkaline water discharge port, and the generated strong acidic water and strong alkaline water are merged. It is also possible to add a setting to discharge near neutral water having sterilizing power.

(Second Embodiment) In the first embodiment, the pitch number of the pulse pump 8 is feedback-controlled in order to always keep the quality of the strongly acidic water discharged from the strongly acidic water discharge port constant. In the second embodiment, the flow rate of tap water is controlled in order to maintain a constant water quality. Except for this point, there is basically no difference from the first embodiment. Therefore, the description of the configuration and the like common to the first embodiment is omitted (hereinafter, the same applies to the third embodiment). next,
The control procedure of the flow rate feedback control in the present embodiment will be described with reference to the flowchart shown in FIG.

B1 to B2: Based on the input signal from the flow rate sensor 9, if the flow rate is normal, the power supply 18 of the electrolytic cell 4 and the electromagnetic switch 19 are started so as to start electrolysis.
To the control signal. On the other hand, if the flow rate is not normal, error processing is performed. B3: Immediately after the start of operation of the device, the three-way solenoid valve 1
By switching between 5 and 16, the generated water flowing out to both the first outflow line 13 and the second outflow line 14 is discharged to the strong alkaline water discharge port side.

B4 to B9: The detection value of the ORP sensor 17 is read, and when the read value is equal to or less than a preset lower limit value (for example, 1000 mV), the flow control valve 2 is controlled so as to reduce the flowing amount of tap water. Control. When the read value exceeds the lower limit and is equal to or higher than the upper limit (for example, 1100 mV), the flow control valve 2 is controlled so as to increase the flow rate of tap water. When the detection values of these ORP sensors 17 are out of the desired appropriate range, both the strongly acidic water and the strongly alkaline water are discharged from the strongly alkaline water discharge port. On the other hand, when the read value of the ORP sensor 17 exceeds the lower limit value and is less than the upper limit value, in other words, when the read value is within an appropriate range for maintaining the desired water quality, the strong acidity from the first outflow line 13 The three-way solenoid valves 15 and 16 are switched so that water is discharged to the strongly acidic water discharge port and strongly alkaline water from the second outflow pipe 14 is discharged to the strongly alkaline water discharge port.

B10: If the control for increasing or decreasing the flowing amount of tap water is continuously executed even after the time set by the timer elapses, it is recognized as an error and error processing is performed.

(Third Embodiment) In the third embodiment,
The configuration is such that a stable water quality is obtained by controlling the applied voltage (or supply power) of the electrolytic cell 4. Next, the control procedure of the electrolytic cell feedback control in this embodiment will be described with reference to the flowchart shown in FIG.

C1 and C2: Based on the input signal from the flow rate sensor 9, when the flow rate is normal, the power supply 18 of the electrolytic cell 4 and the electromagnetic switch 19 are started so as to start electrolysis.
To the control signal. On the other hand, if the flow rate is not normal, error processing is performed. C3: Immediately after the start of operation of the device, the three-way solenoid valve 1
By switching between 5 and 16, the generated water that has flowed out to both the first outflow line 13 and the second outflow line 14 is discharged to the strong alkaline water discharge port side.

C4 to C9: The detection value of the ORP sensor 17 is read, and when the read value is equal to or less than a preset lower limit value (for example, 1000 mV),
Is controlled so as to increase the supplied power. Further, the read value exceeds the lower limit and the upper limit (for example, 1
When it is 100 mV) or more, control is performed so that the power supplied to the electrolytic cell 4 is decreased. These ORP sensors 1
When the detected value of 7 is outside the desired appropriate range, both the strongly acidic water and the strongly alkaline water are discharged from the strongly alkaline water discharge port. On the other hand, when the read value of the ORP sensor 17 exceeds the lower limit value and is less than the upper limit value, in other words, when the read value is within an appropriate range for maintaining the desired water quality, the strong acidity from the first outflow line 13 The three-way solenoid valve 1 is configured so that water is discharged to the strongly acidic water discharge port and strongly alkaline water from the second outflow pipe 14 is discharged to the strongly alkaline water discharge port.
Switch between 5 and 16.

C10: If the control to increase or decrease the power supplied to the electrolytic cell 4 is continuously executed even after the time set by the timer elapses, it is recognized as an error and error processing is performed.

FIG. 7 shows a modification of the system configuration of the strongly acidic water generator. In this example, in the system shown in FIG. 1, six three-way solenoid valves 31, 32, 33, 34,
35 and 36 are used.

The solenoid valves 31 to 34 discharge the strongly acidic water discharged to the first outflow line 13 or the second outflow line 14 even when the electrodes of the electrolytic cell 4 are reversed. It serves to discharge the strong alkaline water to the outlet and to the strong alkaline water discharge port. That is, when strongly acidic water flows out of the first outflow line 13 and strong alkaline water flows out of the second outflow line 14, the solenoid valves 31 and 33 are turned on and the solenoid valves are turned on. When the strong alkaline water flows out to the first outflow line 13 and the strong acid water flows out to the second outflow line 14 due to the inversion of the electrodes, the solenoid valve 31 is turned off. , 33 are turned off,
The solenoid valves 32 and 34 are turned on, whereby the discharge port to the outside of the machine is always fixed.

Although the solenoid valves 35 and 36 are normally in the ON state and the solenoid valve 36 is in the OFF state, when the value detected by the ORP sensor 17 is out of the desired appropriate range, the electromagnetic valves 35 and 36 are turned off. The valve 35 is turned off and the electromagnetic valve 36 is turned on to control the strong acidic water to be discharged from the strong alkaline water discharge port together with the strong alkaline water.

In each of the embodiments described above, only one ORP sensor is provided on the side of the strong acid water discharge port.
And a second outflow pipe 14 are provided, one each for detecting the oxidation-reduction potential of the strongly acidic water and the oxidation-reduction potential of the strongly alkaline water, based on these detected values. Thus, the power supplied to the pulse pump 8, the flow control valve 2, or the electrolytic cell 4 can be controlled.

In the above embodiment, the case where the strongly acidic water is discharged from the strongly alkaline water discharge port together with the strongly alkaline water only when the value detected by the ORP sensor 17 is out of the desired appropriate range has been described. It is also possible to mix strongly acidic water and strong alkaline water respectively discharged from the first outflow pipe 13 and the second outflow pipe 14 to discharge water close to neutral water. By doing so, neutral water having bactericidal activity can be obtained in combination with the strongly acidic water.

In the above-described embodiment, an apparatus for maintaining the oxidation-reduction potential value by controlling one of the injection amount of the electrolytic solution into the tap water, the supply amount of the tap water, and the power supplied to the electrolytic cell. Although described, an embodiment in which the oxidation-reduction potential value is maintained by controlling two or three of these at the same time is also possible.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a strongly acidic water generator according to a first embodiment.

FIG. 2 is a control block diagram of the strongly acidic water generator of the first embodiment.

FIG. 3 is a flowchart showing a control procedure of the pulse pump in the first embodiment.

FIG. 4 is a diagram showing an operation panel.

FIG. 5 is a flowchart showing a control procedure of flow control in the second embodiment.

FIG. 6 is a flowchart showing a control procedure of power supply control of an electrolytic cell in a third embodiment.

FIG. 7 is a system configuration diagram of a strongly acidic water generator according to a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strongly acidic water generator 2 Flow control valve 4 Electrolysis tank 6 Aspirator 7 Salt water tank 8 Pulse pump 9 Flow rate sensor 10 Water temperature sensor 12 Control unit (control means) 13 First outflow pipe 14 Second outflow pipe 15, 16 Three-way solenoid valve 17 ORP sensor 23 CPU (central processing unit) 25 EEPROM 26 Operation panel 28 Generated water adjustment switch 31, 32, 33, 34, 35, 36 Solenoid valve

Claims (8)

[Claims] 1. A strongly acidic water generator for discharging strongly acidic water and strongly alkaline water by electrolyzing a mixed water of tap water and an electrolytic solution in an electrolytic cell, wherein (a) each of the electrolytic cells Polarity switching means for switching the anode chamber and the cathode chamber of the electrolytic cell by reversing the voltage applied to the electrode; (b) a first outflow pipe and a second outflow connected to the discharge port of the electrolytic cell An electromagnetic switching valve that selectively communicates the pipeline with either the strong acid water discharge port or the strong alkaline water discharge port,
(C) an ORP sensor provided at least in an outflow pipe communicating with the strong acid water discharge port and detecting an oxidation-reduction potential of water passing through the outflow pipe; (d) outflow communicating with the strong acid water discharge port Setting means for setting a desired oxidation-reduction potential value of water in the pipeline; and (e) maintaining the desired oxidation-reduction potential value set by the setting means so that the oxidation-reduction potential value detected by the ORP sensor is maintained. A strongly acidic water generating apparatus comprising: a control means for maintaining a redox potential value. 2. The strongly acidic water generating apparatus according to claim 1, wherein the oxidation-reduction potential value maintaining means maintains the oxidation-reduction potential value by controlling an amount of the electrolytic solution injected into the tap water. . 3. The strongly acidic water generator according to claim 1, wherein the oxidation-reduction potential value maintaining means maintains the oxidation-reduction potential value by controlling a supply amount of the tap water. 4. The strongly acidic water generating apparatus according to claim 1, wherein the oxidation-reduction potential value maintaining means maintains the oxidation-reduction potential value by controlling power supplied to the electrolytic cell. 5. The oxidation-reduction potential value maintaining means simultaneously controls any two or three of the injection amount of the electrolytic solution into the tap water, the supply amount of the tap water, and the power supplied to the electrolytic cell. The strongly acidic water generator according to claim 1, wherein the oxidation-reduction potential value is maintained by controlling. 6. An electromagnetic device for mixing strongly acidic water and strongly alkaline water respectively discharged from the first outflow pipe and the second outflow pipe to discharge water close to neutral water. The strongly acidic water generator according to any one of claims 1 to 5, further comprising a switching valve. 7. The strong acid according to claim 1, wherein the desired oxidation-reduction potential value set by the setting means can be changed according to the use of the strong acid water. Water generator. 8. The strongly acidic water generator according to claim 1, further comprising an EEPROM for storing an accumulated use time of the electrolytic cell.