JP2000126774A - Electrolysis control method for forming chlorine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately adjust the concn. of salt to form a constant amt. of chlorine by controlling a current by a constant voltage circuit when a saline soln. is efficiently electrolyzed in an electrolytic cell. SOLUTION: In adding a saline soln. to an electrolytic cell to form chlorine by batch type electrolysis, the saline soln. is gradually supplied to the electrolytic cell until a current value measured at a time when constant voltage is applied across electrodes becomes a predetermined current value. The concn. of salt and an electrolytic time necessary for forming a predetermined amt. of chlorine are determined on the basis of the predetermined current value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolysis control method for chlorine generation in an apparatus for generating chlorine by electrolyzing a saline solution.

[0002]

2. Description of the Related Art Conventionally, as an apparatus having a structure for electrolyzing a saline solution, for example, an acidic ion water generating apparatus disclosed in Japanese Patent Application Laid-Open No. 7-155564 has been known. This is, as shown in FIG. 9, an electrolytic cell 31 and a salt water tank 3.
2 and a water supply pump 33 for supplying salt water to the electrolytic cell 31. The voltage between the electrodes is measured under a constant current, and the water supply pump 33 is controlled based on a comparison with a reference value. This is to keep the salt concentration in the bath 31 constant. In the figure, 35 is a mixing chamber, 38 is a water inlet pipe, and 36 is an acidic ion water tank.

Further, as a device having a structure for electrolyzing salt water, Japanese Unexamined Patent Publication No. Hei 8-267072 discloses an apparatus for circulating and purifying bath water. As shown in FIG. 10, an electrolytic sterilizing apparatus 41, a salt adding section 42 for adding salt thereto, and a control valve 43 for controlling salt addition are provided.
At the start of electrolytic sterilization.
Is opened and salt or saline is added to the electrolytic sterilizer 41. In the figure, reference numeral 22 denotes a pump for sending bath water 1 to the electrolytic sterilizer 41 through the filtration tank 23;
Denotes a heater for warming (heating), 20 denotes a suction port, and 21 denotes a discharge port.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 7-155
A conventional device such as that disclosed in Japanese Patent No. 764 is costly because a constant current circuit is used. If a constant voltage circuit is used, current value control for making the inside of the electrolytic cell a predetermined salt concentration, current value control for generating a desired chlorine amount, and electrolysis time control are necessary,
If the temperature is not constant, temperature correction control must be added, and the control may be complicated.

Further, in the configuration disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-267072, it is difficult to adjust the salt concentration in the electrolytic cell unless the salt concentration in the salt addition section is always constant. Further, in order to make the salt concentration in the salt addition section constant, complicated maintenance such as preparing a solution having a constant concentration in advance and replenishing the solution is required. Even if solid salt is stored in the salt addition section, it is still difficult to adjust the salt concentration in the electrolytic cell only by opening the control valve because the salt is fixed. If the salt concentration in the electrolytic cell is not constant, a certain amount of chlorine cannot be generated. When the amount of chlorine generation is small, the sterilizing power becomes insufficient,
Insufficient sterilization of bath water is caused, and further, slime which may be a nest of Legionella bacteria is generated on a piping system or a bathtub wall. Conversely, when the amount of chlorine generation is too large, there is a problem that even if the sterilization can be sufficiently performed, the water quality becomes unpleasant for bathing in terms of chlorine odor and irritation to the skin.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and when a salt solution is efficiently electrolyzed in an electrolytic cell, the current control is performed by a constant voltage circuit so that the salt concentration can be accurately adjusted. It is an object of the present invention to provide an electrolysis control method for chlorine generation which can produce a fixed amount of chlorine and can be easily controlled.

[0007]

Means for Solving the Problems According to the present invention, when a saline solution is added to an electrolytic cell and chlorine is generated by batch-type electrolysis, a predetermined value is measured while applying a constant voltage between the electrodes. The method is characterized in that the salt solution is gradually supplied to the electrolytic cell until the current value becomes equal to the current value, and based on the predetermined current value, the salt concentration and the electrolysis time required to generate the desired chlorine amount are determined. ing.

When performing batch type electrolysis, first, a saline solution is transferred from a saline solution supply tank to the electrolytic cell. At this time, a current flowing by applying a constant voltage to the electrodes in the electrolytic cell is measured, and a predetermined current is measured. If the value is different from the value, a saline solution is supplied to the electrolytic cell. In addition, measure the current again,
If there is a deviation from the predetermined value, a saline solution is further supplied. By continuing this operation until there is no deviation from the predetermined value, the salt concentration in the electrolytic cell increases, the current value increases under a constant voltage, and finally becomes equal to the predetermined value. At this time, the saline solution charging operation ends. Thereafter, a desired amount of chlorine is generated by performing electrolysis at the current value for a certain period of time.

At this time, a temperature sensor and a control table for determining a predetermined current value for the temperature measured before the electrolysis are provided, and the electrolysis time for determining the predetermined current value corresponding to each temperature is fixed. It is preferable to keep it.

A control table for determining predetermined current values respectively corresponding to a plurality of selectable desired chlorine amounts is provided, and the electrolysis times determined by the set predetermined current values are all constant. preferable.

When the current value is constantly or periodically measured during electrolysis, and the measured current value deviates from a predetermined current value,
It is also preferable to adjust the amount of chlorine generation by increasing or decreasing the electrolysis time.

When the measured current value deviates from a predetermined current value and the amount of chlorine generation is adjusted by increasing or decreasing the electrolysis time, electrolysis time = reference electrolysis time × (predetermined current value / measured current value)
^{It is} advisable to correct the electrolysis time by ² .

Further, when inverting the polarity of the voltage applied between the electrodes, it is preferable that the polarity inversion frequency is set to be one time for every plural times of electrolysis.

A circulating water channel, a circulating pump for circulating bath water in the circulating water channel, a filtration tank for filtering dirt in the bath water, a salt water supply tank provided in a bypass channel for bypassing the circulating water channel, and It can be suitably used for chlorine generation in a bath water circulation purification device provided with a non-diaphragm electrolytic cell having a pair of electrodes built-in downstream.

In this case, the supply of the saline solution to the electrolytic cell is controlled by opening / closing a valve which is connected to the saline solution supply tank and has a positive pressure from the upstream side, or the supply of the saline solution to the electrolytic cell is circulated. It is preferable that the control is performed by repeatedly turning on and off the pump, and the chlorine concentration in the bathtub is set to 1 ppm or less.

[0016]

FIG. 2 shows an apparatus for circulating and purifying bath water, and FIG. 3 is a block diagram of the electrolytic chlorine generation block. Explaining from the circulating purification device, reference numeral 2 in the figure denotes a circulating water channel having one end serving as a suction port 20 and the other end serving as a discharge port 21. A circulating pump 22 is provided at a position near the suction port 20 side of the circulating water channel 2. A heater 24 is provided at a position from the discharge port 21 side. The heater 24 is for preventing the temperature of the bath water 1 from lowering, and may be of a small calorific value. A filtration tank 23 is provided upstream of the heater 24. The filtration tank 23 has a built-in hollow fiber membrane for performing fine filtration. The hollow fiber membrane is periodically removed and subjected to mechanical cleaning or chemical cleaning, and is configured to be removable so that it can be installed in the filtration tank 23 again after the cleaning. In addition, the filter medium in the filtration tank 23 is not limited to a hollow fiber membrane.

In the figure, reference numeral 3 designates a bypass which bypasses between the circulating pump 22 and the filtration tank 23 in the circulating water passage 2. A diaphragm electrolytic cell 5 is provided, and an electric three-way valve 6 is provided upstream of the saline solution supply tank 4. This three-way valve 6 is also connected to the electrolytic cell 5. The bypass 3 may be configured so as to return from the electrolytic cell 4 directly to the bath without joining the circulating water channel 2.

The saline solution supply tank 4 has a double cylindrical structure.
Salt is stored in the inner cylinder. The upper surface of the inner cylinder is open, the side surfaces are opened in a lattice shape, and the opening is covered with a mesh. On the other hand, the outer cylinder has a structure in which the lid is opened. After the lid is opened, the inner cylinder is installed, and the lid is closed again to seal the outer cylinder. In addition, the outer cylinder has the inflow port at the bottom,
An outlet is provided at the top. The saline solution supply tank 4 does not necessarily need to have a cylindrical structure.

The electrolytic cell 5 is a non-diaphragm type in which a pair of insoluble electrode plates are arranged to face each other without interposing a diaphragm.
A constant voltage power supply 25 is connected to the electrode plates, and the power supply (constant voltage power supply) 25 also serves as an ammeter.

When electrolysis of a portion of the chlorine ion [0020] The saline chloride ^{- -} While contains chlorine ions in an electrolytic cell 5 (Cl) (Cl) ( Cl -) chlorine (Cl ₂₎ And converted to hypochlorite ion (ClO ₂ ), and the bath water 1 can be given a sterilizing effect.

The opening and closing of the electric three-way valve 6 on the upstream side of the saline solution supply tank 4 and the electrolytic cell 5 is controlled by a control circuit 26. Note that the three-way valve 6 may be an electric valve or an electromagnetic valve.

The control circuit 26 has a table of temperature and a current value corresponding to each of the selected modes.
In addition, it controls the constant voltage power supply 25 and the circulation pump 22.

Here, the selectable mode means that there are a plurality of desired chlorine amounts, for example, strong, medium,
That is, three modes can be set, and five modes can be set. Thus, it is possible to cope with the water quality with a large load such as a home having a large number of bathers in the strong mode, and to cope with the water quality with a small load such as a home having a small number of bathers in the weak mode. In strong mode, because the desired chlorine amount is large,
The predetermined current value may be set high and the predetermined current value may be set low since the desired chlorine amount is small in the weak mode.

The circulation purifying device formed as described above has
The suction port 20 and the discharge port 21 of the circulation channel 2 are installed in a bathtub in a state of being immersed in the bath water 1, and during normal operation, the bath 22 is sucked into the circulation channel 2 from the suction port 20 by driving the pump 22. After the water is filtered and filtered in the filter tank 23, when the heater 24 is operating, the temperature is prevented from lowering here, and the water returns from the discharge port 21 into the bathtub.

Next, the operation during the generation of electrolytic chlorine will be described with reference to the flowchart of FIG. The control circuit 26 receiving the command to start the electrolysis first measures the temperature, and determines a predetermined current value corresponding to the temperature and corresponding to the selected mode from the control table. Then, once, pump 2
2 is stopped and a signal is sent to the electric three-way valve 6 to open the saline solution supply tank 4 side. When voltage application to the electrodes of the electrolytic cell 5 is started and the pump 22 is driven for a short time, a small amount of bath water 1 flows into the saline solution supply tank 4 through the three-way valve 6, and the same amount of saline solution is supplied. It flows into the electrolytic cell 5.

In the electrolytic cell 5, the electric conductivity increases due to the inflow of the saline solution, and the current flowing in the constant voltage electrolysis increases. The control circuit 26 compares the current value measured by the ammeter 25 with a predetermined value set in advance and, when the measured current value is smaller than the predetermined value, drives the pump 22 once again. When this is repeated several times, the current value gradually increases as shown in FIG. 6, and finally the measured current value becomes equal to or exceeds the predetermined value. Means it has reached At this point, the control circuit 26 closes the three-way valve 6 and operates the pump 22 in normal operation. Continue the electrolysis as it is, after a predetermined time,
The voltage application is stopped, and the control circuit 26 sends a signal to the three-way valve 6 to switch the flow path to the electrolytic cell 5 side, thereby controlling the bath water 1.
Is branched from the bypass channel 3 and flows into the electrolytic cell 5, and chlorine generated by electrolysis stored in the electrolytic cell 5 is pushed out to the circulating water channel 2.

The generated chlorine is sterilized in the bath water 1 and circulated, thereby sterilizing the bathtub walls and pipes, and the filtration tank 2.
3 can sufficiently sterilize the hollow fiber membrane, and as a result, the water quality of the bath water 1 can be kept clear for a long time.

Here, other electrolysis conditions such as an electrode area and an electrolytic cell volume are set so that the electrolysis time is automatically determined when a predetermined current value required to generate a desired amount of chlorine is determined. . In addition, by providing a plurality of modes, a plurality of desired chlorine amounts are present, and different current values correspond to the respective amounts.However, the electrolysis conditions are set so that the electrolysis time is constant regardless of the current value. There is no need to control the electrolysis time. Similarly, although the predetermined current value differs depending on the temperature, the electrolysis time is all constant, and the control of the electrolysis time is unnecessary.

Next, points to be noted about temperature correction when setting the current value on the control table will be described. As shown in FIG. 7, the relationship between the salt concentration and the current value is affected by the temperature. When a constant voltage is applied, the current flowing increases as the temperature increases at an arbitrary salt concentration. Therefore, when the temperature is higher than the reference value, the current easily flows, and the salt concentration corresponding to an arbitrary current value becomes lower than the required salt concentration at the reference temperature. Therefore, the predetermined current value needs to be set high in advance.

Similarly, when the temperature is low, the current hardly flows, so that the salt concentration corresponding to an arbitrary current value becomes higher than the required salt concentration at the reference temperature, and the predetermined current value must be set low. No. For example, for a current value of 1 A, when the reference temperature is 40 ° C., the required salt concentration is 4000 ppm, but when the measurement temperature is 43 ° C., the salt concentration is 3600 ppm, and when the measurement temperature is 36 ° C., the salt concentration is It was 4600 ppm. Therefore 4
When the predetermined current value is set to 1.12 A at 3 ° C. and 0.86 A at 36 ° C., the salt concentration in the electrolytic cell becomes 4000 ppm.

Further, also at the time of chlorine generation, as shown in FIG. 8, the chlorine generation amount is affected by the temperature and is presumed to be due to the thermal decomposition of chlorine during the generation, but the higher the temperature, the smaller the chlorine amount. For this reason, when the temperature is higher than the reference value, the chlorine generation efficiency is poor, and the chlorine generation amount corresponding to an arbitrary current value is smaller than the chlorine generation amount at the reference temperature. Therefore, it is necessary to set the electrolytic current value high in advance.

Similarly, when the temperature is low, the efficiency of chlorine generation is high, and the amount of chlorine generation corresponding to an arbitrary current value becomes larger than the amount of chlorine generation at the reference temperature. Therefore, the electrolytic current value must be set low. Must. For example, current value 1
A, when the reference temperature is 40 ° C., the desired chlorine amount is 22.
Although it was 0 mg, when the measurement temperature was 43 ° C., the amount of chlorine produced was 189 mg, and when the measurement temperature was 36 ° C., the salt concentration was 263 mg. Accordingly, when the set current value is 1.12 A at 43 ° C. and 0.86 A at 36 ° C., the amount of chlorine generation is 222 mg.

As described above, both the current value for supplying the saline solution and the current value for generating chlorine require temperature correction. However, since other electrolysis conditions are set so that they are equal, each of the current values must be corrected. The predetermined current value on the control table at the temperature may be one.

It should be noted that, as the electrolysis is continued, scales such as calcium and magnesium contained in tap water adhere to the electrode surface on the cathode side, and it is well known that the polarity is reversed to prevent the scale. However, since the polarity inversion affects the life of the electrode, if the polarity is inverted each time the electrolysis is performed, the life is shortened and maintenance such as electrode replacement is required, which is not preferable in terms of cost and labor for replacement. Conversely, if the polarity inversion is not performed at all, scale adhesion will occur on the electrode surface, and the electrode area will decrease, resulting in partial deterioration on the electrode surface.

Therefore, the polarity inversion is set to 1 every plural times of electrolysis.
The number of turns makes it possible to extend the life of the electrode without adhesion of scale. In this embodiment, by inverting the polarity at a rate of once every ten times of electrolysis, the life of the electrode having a life of 2.5 years at each inversion can be made 20 years. Of course, depending on the performance of the electrode used, 1
It is not stipulated that it is once in 0 times.

Furthermore, if chlorine is generated too much, chlorine that cannot withstand bathing will be mixed into the bath water 1, which not only makes bathing unpleasant, but may also affect the human body. Therefore, the chlorine concentration in the bath water 1 was set so as not to exceed 1 ppm. At this time, if the load is high, such as a large number of bathers, the strong mode is used.However, since the amount of chlorine consumed by the load also increases, the amount of chlorine generated is set in consideration of the chlorine consumption due to the bathing load. Current value to be set. For example, when the desired chlorine amount is 220 mg in the medium mode (chlorine concentration in bath water 0.98 p
pm), and the set current value is 1 A. In the strong mode, the desired chlorine amount is 330 mg (chlorine concentration in bath water 0.96
ppm) The current value for that was set to 1.25A.

FIG. 4 shows another example. Here, the correction of the electrolysis time is incorporated. That is, after the control circuit 26 receives the command to start electrolysis, the process is the same as that described above until the salt concentration in the electrolytic cell 5 reaches a predetermined concentration. The measured current values are compared to calculate the electrolysis time. Thereafter, the operation is the same as that described above.

If the measured current value exceeds the predetermined current value, it means that the salt concentration in the electrolytic cell 5 has exceeded the predetermined concentration, and the electrolytic current value has also exceeded the predetermined value. Chlorine will exceed the desired amount of chlorine. Therefore, the production time is adjusted by shortening the electrolysis time so that the produced chlorine does not exceed the desired amount.

Conversely, when the measured current value falls below the predetermined current value due to an error in the measurement sensor or the like, it means that the salt concentration in the electrolytic cell 5 was less than the predetermined concentration, and the electrolytic current value was also lower than the predetermined value. Since it is lower, the produced chlorine will be less than the desired chlorine amount. Therefore, the production time is adjusted by increasing the electrolysis time so that the produced chlorine reaches a desired amount.

Here, the electrolysis time is corrected by adding to the reference electrolysis time. The reference electrolysis time is automatically determined when a predetermined current value required to generate a desired chlorine amount is determined. By providing steps, a plurality of desired chlorine amounts exist, and different current values correspond to the respective chlorine amounts, but the reference electrolysis time is constant regardless of which current value. Similarly, although the predetermined current value differs with respect to the temperature, the reference electrolysis time is all constant.

The correction to be applied is determined by the following formula.

Electrolysis time = reference electrolysis time × (predetermined current value /
(Measured current value) ² For example, when the predetermined current value is 1 A, the measured current value is 1.1 A
Therefore, if the electrolysis time is not shortened, the chlorine generation amount increases unless the electrolysis time is shortened. Therefore, according to the above formula, if the reference electrolysis time is 90 minutes, the corrected electrolysis time is 74 minutes. Desired chlorine amount 22
The chlorine production amount actually measured at 0 mg was 221 mg when the electrolysis time was not corrected, compared to 261 mg when the electrolysis time was not corrected.

FIG. 5 shows still another example. Here, the above 2
Compared with the example, the saline solution is supplied only by opening the valve.

That is, the control circuit 26 which has received the command to start the electrolysis first measures the temperature, and determines a predetermined current value corresponding to the temperature and the selected mode from the control table. After that, without stopping the pump 22, voltage application to the electrode of the electrolytic cell 5 is started, and the three-way valve 6 is started.
To open the saline solution supply tank for a very short time. Then, since the pressure from the pump is applied, a small amount of bath water 1 flows into the saline solution supply tank 4 through the three-way valve 6, and the same amount of saline solution flows into the electrolytic cell 5.

In the electrolytic cell 5, the electric conductivity increases due to the inflow of the saline solution, and the flowing current increases. The current value is measured by the ammeter 25, and the control circuit 26 compares the measured current value with a predetermined value set in advance. When the measured current value is smaller than the predetermined value, the three-way valve 6 is opened and closed once again. When this is repeated several times, as shown in FIG. 7, the current value gradually increases until the measured current value becomes equal to or exceeds the predetermined value. At this time, the salt concentration in the electrolytic cell 5 is changed. Means that a predetermined concentration has been reached, and thereafter the same as in the first embodiment. The shorter the minute time the three-way valve is opened, the more accurately the current value can reach the predetermined value.

In this example, the control is performed based on the number of times the valve is opened. However, the control may be performed based on the opening time of the valve. At that time, after the three-way valve 6 is opened to the saline solution supply tank side, it continues to be opened until the measured current value becomes equal to the predetermined current value.

[0047]

According to the first aspect of the present invention, the salt concentration in the electrolytic cell can be adjusted to a predetermined concentration by measuring the current value and performing feedback control, and the salt concentration can be adjusted to a predetermined current value corresponding to the predetermined concentration. Since the electrolysis is performed, only one predetermined current value needs to be set, and the set value does not have to be set separately for the introduction of salt and for the generation of chlorine. The amount of chlorine produced is proportional to the quantity of electricity, and the quantity of electricity is given by the product of the current and the time passed. Therefore, it is usually necessary to control the current value and the electrolysis time,
For controlling the current value, the current value can be controlled by controlling the salt concentration in the electrolytic cell with a constant voltage circuit without using a costly constant current circuit. When the current value can be controlled, the amount of generated chlorine can be controlled. Further, since the electrolysis conditions are set so that the electrolysis time is automatically determined when the current value is determined, there is no need to control the electrolysis time.

According to the second aspect of the present invention, the relationship between the salt concentration and the current value is affected by the temperature. When a constant voltage is applied, the current flowing increases as the temperature increases with an arbitrary salt concentration. Therefore, when the temperature is higher than the reference value, the current easily flows, so that the salt concentration corresponding to an arbitrary current value is lower than the required salt concentration at the reference temperature. Further, when the temperature is high, the chlorine generation efficiency decreases. Therefore, when the temperature is higher than the reference value, the predetermined current value is set high in advance,
Similarly, when the temperature is low, since the current does not easily flow, the salt concentration corresponding to an arbitrary current value is higher than the required salt concentration at the reference temperature, and the chlorine generation efficiency is further increased. ing. Therefore, even if the water temperature deviates from the reference temperature, a desired chlorine amount can be obtained. Also, since the electrolysis conditions are set so that the electrolysis time is all constant even if the current value differs depending on the temperature,
There is no need to control the electrolysis time.

According to the third aspect of the present invention, since a control table for determining a predetermined current value corresponding to each of a plurality of selectable desired chlorine amounts is provided, the predetermined chlorine amount is increased in the strong mode in order to increase the desired chlorine amount. If the current value is set high and the desired amount of chlorine is reduced in the weak mode, and the predetermined current value is set low, the amount of chlorine generation can be selected by the user, but the control is never complicated. Further, since the electrolysis conditions are set so that the electrolysis time is the same even if the current value differs depending on the mode, there is no need to control the electrolysis time.

According to the fourth aspect of the invention, when the measured current value exceeds the predetermined current value, it means that the salt concentration in the electrolytic cell has exceeded the predetermined concentration, and the electrolytic current value has also exceeded the predetermined value. Therefore, the generated chlorine exceeds the desired chlorine amount. Therefore, the electrolysis time is shortened so that the generated chlorine does not exceed the desired amount. Conversely, when the measured current value falls below the predetermined current value, it means that the salt concentration in the electrolytic cell was below the predetermined concentration, and the electrolytic current value was lower than the predetermined value. Will be insufficient. Therefore, the electrolysis time is extended so that the generated chlorine reaches a desired amount. Because of this adjustment of the electrolysis time, the amount of chlorine produced is always not too large, not too small and constant with respect to the desired value.

According to the fifth aspect of the present invention, when the amount of chlorine generation is adjusted by increasing or decreasing the electrolysis time, the electrolysis time is corrected by a calculation formula [electrolysis time = reference electrolysis time × (predetermined current value / measured current value) ² ]. Therefore, the amount of chlorine generation can be controlled with little deviation from the desired value.

According to the sixth aspect of the present invention, since the polarity is inverted, there is no scale adhesion, there is no partial deterioration on the electrode surface when the scale is attached, and the number of polarity inversions is one for every plural times of electrolysis. Therefore, the life of the electrode can be extended.

According to the seventh aspect of the present invention, in the bath water circulation purifying apparatus, a constant amount of chlorine can be obtained by electrolysis, the bath water can be sufficiently sterilized, and furthermore, a piping system and a bathtub can be obtained. There is no slime on the walls that could be a nest for Legionella bacteria. In addition, the water quality is not unpleasant for bathing in terms of chlorine odor and irritation to the skin. In addition, when there is a range of choices by the user for the amount of chlorine generation, the mode is set to the strong mode for the water quality with a large load such as a home with a large number of bathers, and the weak mode for the water quality with a small load such as a household with a small number of bathers. Can be handled by mode.

According to the eighth aspect of the present invention, when the saline solution is supplied from the saline solution supply tank to the electrolytic cell, the valve is opened. Then, since a positive pressure is applied to the upstream side of the on-off valve, the saline solution is supplied from the saline solution supply tank to the electrolytic cell by opening the valve. When controlling by opening and closing the valve in this way, there is no need to install a dedicated pump to supply the saline solution from the saline solution supply tank to the electrolytic tank, and it is sufficient to use the driving force of the circulating pump as it is. Can be made compact without increasing the size.

According to the ninth aspect of the present invention, when the saline solution is supplied from the saline solution supply tank to the electrolytic cell, the circulation pump is driven for a very short time. When the control is performed by turning the pump on and off in this manner, the pump drive time can be set to be shorter than the open time between the opening and closing operations of the valve, so that the salt concentration can be controlled with higher accuracy. In addition, there is no need to install a dedicated pump for supplying the saline solution from the saline solution supply tank to the electrolytic tank, and it is sufficient to use the driving force of the circulation pump as it is, so that the size of the apparatus is not increased. Further, the number of times of opening and closing of the valve can be reduced, which is advantageous in terms of the life of the valve.

According to the tenth aspect of the present invention, since the maximum chlorine concentration of the bath water is specified, the adverse effects of chlorine odor and irritation to the skin during bathing are eliminated, and the water quality becomes unpleasant for bathing. There is no.

[Brief description of the drawings]

FIG. 1 is a flowchart of an example of an electrolysis method according to the present invention.

FIG. 2 is a block diagram illustrating an example of an overall configuration.

FIG. 3 is a configuration diagram of a sympathetic chlorine generation block.

FIG. 4 is a flowchart of another example.

FIG. 5 is a flowchart of yet another example.

FIG. 6 is an operation time chart showing a part of control.

FIG. 7 is a characteristic diagram of temperature and current value.

FIG. 8 is a characteristic diagram of temperature and chlorine amount.

FIG. 9 is a block diagram of a conventional example.

FIG. 10 is a block diagram of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bath water 2 Circulating water channel 3 Bypass channel 4 Salt solution supply tank 5 Non-diaphragm electrolytic cell 6 Electric three-way valve 20 Suction port 21 Discharge port 22 Circulating pump 23 Filtration tank 24 Heater 25 Constant voltage power supply / Ammeter 26 Control circuit 31 Electrolytic tank 32 Salt water tank 33 Water supply pump 41 Electrolytic sterilizer 42 Salt addition section 43 Control valve

[Procedure amendment]

[Submission date] January 11, 1999 (1999.1.1)
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

The present invention relates to an electrolysis control for chlorine generation in an apparatus for generating chlorine by electrolyzing a saline solution.
It is about the method .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

When electrolysis of a portion of the chlorine ion [0020] The saline chloride ^{- -} While contains chlorine ions in an electrolytic cell 5 (Cl) (Cl) ( Cl -) chlorine (Cl ₂₎ And converted to hypochlorite ion (ClO ⁻ ) , so that the bath water 1 can have a sterilizing effect.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

In the electrolytic cell 5, the electric conductivity increases due to the inflow of the saline solution, and the flowing current increases. The current value is measured by the ammeter 25, and the control circuit 26 compares the measured current value with a predetermined value set in advance. When the measured current value is smaller than the predetermined value, the three-way valve 6 is opened and closed once again. When this is repeated several times, FIG. 6 (io indicates a certain temperature and selection mode
Salt concentration and electrolysis time required to produce chlorine
The given current value, no, is given at a certain temperature and in the selection mode.
Salt concentration required to produce chlorine))
The current value gradually increases, and finally the measured current value becomes equal to or exceeds the predetermined value.
This means that the salt concentration in the electrolytic cell 5 has reached a predetermined concentration, and thereafter the same as in the first embodiment. The shorter the minute time the three-way valve is opened, the more accurately the current value can reach the predetermined value.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat 参考 (Reference) C02F 1/50 550 C02F 1/50 550L 550D 560 560F 560Z F term (reference) 4D061 DA04 DA07 DB10 EA02 EB02 EB04 EB05 EB37 EB39 FA13 GA09 GA12 GC05 GC06 GC15 GC16 GC18

Claims (10)

[Claims] In producing chlorine by adding a saline solution to an electrolytic cell and performing batch-type electrolysis, while measuring a current value when a constant voltage is applied between the electrodes, the salt solution is supplied to the electrolytic cell until it becomes equal to a predetermined current value. An electrolysis control method for chlorine generation, characterized by gradually supplying water and determining a salt concentration and an electrolysis time required to generate a desired chlorine amount based on a predetermined current value. 2. A temperature sensor, and a control table for determining a predetermined current value with respect to a temperature measured before electrolysis, wherein an electrolysis time in which a predetermined current value corresponding to each temperature is determined is constant. 2. The method for controlling electrolysis for chlorine generation according to claim 1, wherein: 3. A control table for determining predetermined current values respectively corresponding to a plurality of selectable desired chlorine amounts, wherein the set electrolysis times determined by the plurality of predetermined current values are all constant. 3. A method according to claim 1, wherein
The electrolysis control method for chlorine generation as described above. 4. The method according to claim 1, wherein the current value is measured constantly or periodically during electrolysis, and when the measured current value deviates from a predetermined current value, the amount of chlorine generation is adjusted by increasing or decreasing the electrolysis time. The method for controlling electrolysis for chlorine generation according to claim 1. 5. When the measured current value deviates from a predetermined current value and the amount of chlorine generation is adjusted by increasing or decreasing the electrolysis time, electrolysis time = reference electrolysis time × (predetermined current value / measured current value)
^The electrolysis control method for chlorine generation according to claim 4, wherein the electrolysis time is corrected by (2). 6. The method according to claim 1, wherein when inverting the polarity of the voltage applied between the electrodes, the frequency of the polarity inversion is set to be one time for a plurality of times of electrolysis. Electrolysis control method for chlorine generation. 7. A circulating water channel, a circulating pump for circulating bath water in the circulating water channel, a filtration tank for filtering dirt in the bath water, a saline water supply tank provided in a bypass channel for bypassing the circulating water channel, and The chlorine generation apparatus according to any one of claims 1 to 6, wherein the apparatus is used for chlorine generation in a circulating purification apparatus for bath water provided with a non-diaphragm electrolytic cell having a pair of electrodes built-in on the downstream side. Electrolysis control method. 8. The electrolysis for chlorine generation according to claim 7, wherein the supply of the saline solution to the electrolytic cell is controlled by opening and closing a valve which is connected to the saline solution supply tank and has a positive pressure applied from the upstream side. Control method. 9. The method according to claim 7, wherein the supply of the saline solution to the electrolytic cell is controlled by repeatedly turning on and off a circulation pump. 10. The electrolysis control method for chlorine generation according to claim 7, wherein the concentration of chlorine in the bathtub is 1 ppm or less.