JP3530452B2 - Water treatment equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large water tank such as a pool or a bathtub in a bathhouse, a water tank arranged on the roof of a building, or a small water tank such as a bathtub for general households.
The present invention relates to a novel water treatment device that can sterilize water to be treated stored in various water tanks.

[0002]

2. Description of the Related Art For example, pools installed indoors and outdoors, bathtubs at inns and public baths, and so on, are regularly treated with so-called bleach (soaked powder, advanced bleached powder) or sodium hypochlorite to maintain its water quality. (NaClO)
It is necessary to sterilize by adding the above aqueous solution.

However, in the past, this work was manually performed by an employee of a pool or a bath, and since the aqueous solution of bleach and sodium hypochlorite has an irritating property, the work should be performed with sufficient caution. There is a problem in that it requires a great deal of effort to perform the processing. Further, since the chlorinated powder is a solid powder, it takes a long time to dissolve and become uniform in concentration after being charged, and there is also a problem that the pool and the bath cannot be used during that time.

Further, in the case of a water tank arranged on the roof of a building or a bathtub for general household use, chlorine is contained in tap water for sterilization at present, and especially in the water tank. In this case, water quality may deteriorate due to algae growing inside. In addition, in the case of a bathtub for general household use, it is likely that there is no problem in terms of water quality because the water is replaced approximately every 1-2 days, but the inside of the boiler connected to the bathtub cannot be frequently cleaned. As a result, various bacteria and fungi easily propagate, and there is a concern that the water quality will deteriorate.

[0005]

Therefore, the applicant of the present application is
The present invention has invented a water treatment device that introduces the water to be treated stored in each water tank as described above into an electrolytic tank and sterilizes it by an electrochemical reaction. In the water treatment device according to the present invention, the water to be treated is supplied to the electrolytic bath having the electrodes, and an electrochemical reaction (so-called electrolysis) is performed on the water to be treated. By the applied electrochemical reaction, hypochlorite ion, chlorine gas, HClO, etc. are generated, and these are dissolved in the water to be treated, whereby the water to be treated is sterilized.

In a water treatment apparatus which uses an electrolytic cell to sterilize by an electrochemical reaction as described above, (1) the degree of adhesion of the scale attached to the electrode so that the electrochemical reaction in the electrolytic cell is performed well, It is necessary to accurately grasp the life of the electrode, (2) it is necessary to control the residual chlorine concentration of the water treated by the electrochemical reaction to be a desired concentration, (3) the electrochemical reaction in the electrolytic cell However, there is a problem that the water treatment must be carried out safely, and it was necessary to provide a water treatment device having a configuration that solves these problems.

The present invention solves the above problems,
It is an object of the present invention to provide a novel water treatment device that can sterilize safely and favorably. More specifically, it is an object of the present invention to provide a novel water treatment device utilizing an electrochemical reaction, which solves the above problems (1) to (3).

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1 has an electrode, and an electrolytic cell for sterilizing water to be treated supplied by energizing the electrode by an electrochemical reaction, and electrolysis. In a water treatment device having a gas liquid separation tank for separating a gas generated during an electrochemical reaction in the tank from water, an electrode based on a hydrogen concentration detection means provided in the gas liquid separation tank and a signal from the hydrogen concentration detection means A water treatment device, comprising: an energization amount control unit that controls energization to the water.

According to a second aspect of the present invention, an electrolytic cell having an electrode for sterilizing water to be treated supplied by energizing the electrode by an electrochemical reaction, and a gas generated during the electrochemical reaction in the electrolytic cell are water. In a water treatment device having a gas-liquid separation tank for separating from a gas-liquid separation tank, exhaust means for forcibly exhausting the gas separated in the gas-liquid separation tank, means for detecting the exhaust state of the exhaust means, and a detection signal of the detection means. hand,
A means for controlling the amount of electricity applied to the electrode, and a water treatment device.

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

According to the first and second aspects of the invention, in an apparatus in which a gas-liquid separation tank is provided side by side with the electrolytic cell, the gas generated during the electrochemical reaction separated in the gas-liquid separation tank can be safely treated.

Particularly, in the structure of claim 1 , when the hydrogen concentration in the separated gas becomes high due to some abnormality in the gas-liquid separation tank, the energization to the electrode is suppressed or stopped. There is no danger of ignition of hydrogen gas. Further, in the configuration of claim 2 , when the forced evacuation means of the gas-liquid separation tank fails, the energization of the electrodes is stopped.

The gas-liquid separation tank in claims 1 and 2 may be constructed as a tank separate from the electrolytic tank,
It may be incorporated in a part of the electrolytic cell.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. Figure 1
It is a figure which simplifies and shows the structure which assembled the water treatment equipment 1 concerning one Embodiment of this invention in the large-sized water tank 2 called a pool.

The water tank 2 is provided with a main circulation path 20 for circulating the water to be treated W stored therein. In the main circulation path 20, a circulation pump 21, a filter 22 for sand filtration, and a heat exchanger 23 for heating the water to be treated are arranged. The water W to be treated in the aquarium 2 is 1
As shown by the dotted chain line, it circulates in the main circulation path 20. In the water treatment device 1 according to this embodiment, the water channel 10 that branches from the branch point J1 on the downstream side of the filter 22 to take in water and join the treated water to the branch point J2 on the downstream side of the heat exchanger 23. Have. Waterway 1 branched from junction J1
Reference numeral 0 indicates an adjusting valve B1 for adjusting the flow rate, a filter 11 for filtering, an ion exchange resin 12, a conductivity sensor 13, an electromagnetic valve B2, an electrolysis tank 14, an electromagnetic valve B3, a flow meter 15, an adjusting valve B4, and circulation. A pump 16, a flow meter 17, a check valve B5, adjusting valves B6, B7 are interposed, and merge with a branch point J2.

Further, a branch point J3 is provided in the water channel 10 between the regulating valve B1 and the filter 11, and a water diversion channel 30 extends from the branch point J3. A regulating valve B8 and a residual chlorine concentration sensor 31 are interposed in the water diversion channel 30. The water that has passed through the residual chlorine concentration sensor 31 is guided to the drain. The electrolytic cell 14 is provided with a plus side electrode set 41 and a minus side electrode set 42. Each electrode set 41, 42 is provided with a plurality of electrode plates. Each electrode plate is
For example, gold (Au), platinum (Pt), palladium (Pd), platinum-on the entire surface of a substrate made of titanium (Ti).
It is preferable to coat a thin film of a noble metal such as iridium (Pt-Ir) by a plating method or a baking treatment.

The plus side electrode set 41 is connected to the plus side potential of the power source voltage 43, and the minus side electrode set 42 is connected to the minus side potential of the power source voltage 43. An ammeter 4 is provided in the connection path between the power supply voltage 43 and the positive electrode set 41.
4 has been inserted. Therefore, from the power supply voltage 43 to the electrode set 4
The current flowing to 1, 42 can be measured by the ammeter 44.

The electrolytic cell 14 is provided with a charging port 45 for charging a maintenance agent and the like, and a drain port 46 for discharging the solution in the electrolytic cell 14. One end of a supply path 47 is connected to the input port 45, and the supply path 4
The other end of 7 is immersed in the acetic acid solution tank 48. A constant flow pump 49 and a solenoid valve B9 are interposed in the supply passage 47. On the other hand, a drain pipe 50 having a solenoid valve B10 is connected to the drain port 46.

The electrolytic cell 14 is also provided with a thermistor 40 as a temperature detecting means for detecting the temperature of the cell. The outlet side water channel 10 of the electrolytic cell 14 has an electrolytic cell 14
A pressure gauge 51 is provided for measuring the pressure of water flowing out from the pressure gauge 51. Further, the circulation pump 16 and the flow meter 17
A branch point J4 is provided in the water channel 10 between and, and a supply channel 52 is connected to the branch point J4. Supply path 52
The tip of is connected to the NaClO tank 53,
The NaClO in the IO tank 53 is pumped out by the constant flow rate pump 54, passes through the supply path 52, and flows from the branch point J4 to the water path 1.
It flows into 0 and flows to the branch point J2 side.

The operation of the water treatment device 1 having the above structure is as follows. The water in the aquarium 2 is pumped out by the circulation pump 21,
The filter 22 removes organic substances by sand filtration. Then, at the branch point J1, the water is returned to the water tank 2 through the heat exchanger 23 and the water that flows into the water treatment device 1 is separated.
The flow rate of the water flowing into the water treatment device 1 is adjusted by the adjusting valve B1, the organic matter is removed by the filter 11,
After the ions such as calcium and magnesium are removed by the ion exchange resin 12, the conductivity sensor 13 and the solenoid valve B
2 to the electrolytic cell 14. Conductivity sensor 13
Then, the electric conductivity, which is the electric conductivity of the water to be treated supplied to the electrolytic bath 14, is measured.

A part of the water flowing into the water channel 10 flows from the branch point J3 to the water diversion channel 30 and is supplied to the residual chlorine concentration sensor 31 while its flow rate is adjusted by the adjusting valve B8. The residual chlorine concentration sensor 31 measures the residual chlorine concentration of the water to be treated. The water that has passed through the residual chlorine concentration sensor 31 is discharged to the drain. Residual chlorine concentration sensor 31
The reason why the water channel of the above is used as the water diversion channel is that the residual chlorine concentration sensor 31 has an extremely small allowable flow rate. Therefore, the amount of water drained to the drain is also extremely small.

In the electrolytic cell 14, the positive electrode set 41 and
DC current should be applied between the negative electrode pair 42 and the negative electrode pair 42.
Causes electrolysis. In electrolysis,
Electrochemical reaction such as occurs and is generated by this reaction
Hypochlorite ion (ClO^-), Chlorine gas, HClO
Active oxygen generated in the reaction process for a very short time
(O₂ ^-) Etc. sterilize the water to be treated.

(Anode side) 4H ₂ O-4e ⁻ → 4H ⁺ + O ₂ ↑ + 2H ₂ O 2Cl ⁻ → Cl ₂ + 2e ⁻ H ₂ O + Cl ₂ ⇔ HClO + H ⁺ + Cl ⁻ (cathode side) 4H ₂ O + 4e ⁻ → 2H ₂ ↑ + 4OH ⁻ (anode side + cathode side) H ⁺ + OH ⁻ → H ₂ O The water sterilized in the electrolytic cell 14 is pumped out by the circulation pump 16. That is, the water sterilized in the electrolytic bath 14 flows through the water passage 10 via the electromagnetic valve B3, the flow meter 15, the adjusting valve B4 and the circulation pump 16, and further the flow meter 17, the check valve B5 and the adjusting valve. It flows into the main circulation path 22 from the branch point J2 via B6 and B7, and flows into the water tank 2. As a result, the water in the water tank 2 is sterilized.

Further, in this embodiment, when sterilization by electrolysis of the electrolytic cell 14 requires a long time for sterilization, the NaClO in the NaClO tank 53 is pumped out by the constant flow rate pump 54 into the water channel 10. It is supposed to be inflowed. A feature of this embodiment is that a favorable sterilization process can be performed by controlling the water treatment apparatus 1 having the above-described configuration by a control unit including a microcomputer described below. is there.

FIG. 2 is a block diagram showing the electrical configuration of the water treatment device 1 shown in FIG. Although not shown in FIG. 1, the water treatment device 1 includes a control unit 60 including a microcomputer or the like. The control unit 60 is supplied with detection signals from various sensors provided in the water treatment device 1 described in FIG. That is, the conductivity sensor 13, the residual chlorine concentration sensor 31, the thermistor 4
0, ammeter 44, flow meters 15 and 17, and pressure gauge 51
The detection signal of is given to the control unit 60. The control unit 60 controls the operation of the water treatment device 1 according to a predetermined operation program in accordance with the given detection signals. Specifically, the solenoid valves B2, B3, B9, B10, the constant flow rate pumps 49, 54, the circulation pump 16 and the power supply voltage 43 are controlled. In addition, in this embodiment, the example in which the water treatment device 1 is provided with four electromagnetic valves has been described.
1, B4, B6, B7, B8 may be replaced with solenoid valves as appropriate. Further, a valve may be inserted in the water channel 10 or the supply channel 52 as needed.

Further, the control unit 60 is given a signal from the setting unit 61. The setting unit 61 has an operation panel that can be operated by an administrator of the water treatment device 1, and can set a desired operating state by the operation panel. For example, aquarium 2
It is possible to set the target value of the residual chlorine concentration of. Further, in the case of a gas-liquid separation type water treatment device 100 as shown in FIG. 6 which will be described later, a float switch 71 and a hydrogen gas sensor 7 are provided with respect to the control unit 60 as indicated by a chain line.
3 and the detection signals of the ventilation fan ammeter 74a are given.
Further, the control unit 60 controls the operations of the circulation pump 76 and the ventilation fan 74.

FIG. 3 is a flow chart showing the maintenance control of the electrolytic cell 14 in the control operation performed by the controller 60. By the control of FIG. 3, the degree of attachment of the scale to the electrode sets 41 and 42 provided in the electrolytic cell 14 and the life of the electrode sets 41 and 42 are determined, and the attached scale is automatically cleaned. A specific description will be given according to the flowchart of FIG. The control unit 60 is provided with a memory area and has three proportional constants K ₀ , Kx and K in advance.
Can be set. Where K ₀ is electrode set 4
It is an initial proportional constant of 1, 42 and is a value indicating the maximum capacity of the electrode sets 41, 42. Kx is a proportional constant used for determining whether or not the electrode sets 41 and 42 are washed with acetic acid. K is a proportional constant calculated from the current value of current flowing through the electrode sets 41 and 42 and the conductivity.

In the control operation, first, K ₀ , Kx and K
All three proportional constants are initialized to "0" (step S1). Next, the proportional constant K is calculated by calculation (step S2). It is known that when a constant DC voltage is applied between the electrodes, the current value flowing between the electrodes is generally proportional to the conductivity σ of the solution existing therebetween. Therefore, between the conductivity σ and the current I flowing between the electrodes, I
= Kσ holds. Therefore, in the controller 60, the ammeter 4
The proportional constant K is calculated based on the electric current value I obtained from No. 4 and the electric conductivity σ obtained from the electric conductivity sensor 13.

Next, it is judged whether K ₀ is "0" (step S3). Immediately after the control is started, K ₀ is initialized to “0”, and therefore, the process proceeds to step S4, and K calculated in step S2 is set as the proportional constant K ₀ . Then, it is judged whether or not the proportional constant Kx is "0" (step S5). Immediately after the start of control, Kx is initialized to "0", and therefore the process proceeds to step S6 and Kx = K is set.

Next, in step S7, the magnitude of K and 0.2K ₀ are compared. Immediately after the control is started, K ₀ is K ₀ = K as set in step S 4, so the determination in step S 7 is denied, the process in step S 8 is skipped, and the process proceeds to step S 9. In step S9, K
And the size of 0.8Kx are compared. Immediately before the start of control, during Kx, Kx is set as set in step S6.
= K, the determination in step S9 is denied, the processing in steps S10 and S11 is skipped, and the processing from step S2 is repeated.

As the electrolysis time in the electrolytic cell 14 elapses, scale and the like gradually adhere to the electrodes. Therefore, the value of the current flowing through the electrode sets 41, 42 gradually changes. Based on this change in current value, in step S2,
The current proportional constant K is calculated from the relation of I = Kσ. The calculated K gradually decreases. After the process starts,
Since the determinations in steps S3 and S5 are both denied, the processes in steps S4 and S6 are skipped and the determinations in steps S7 and S9 are made. The proportional constant K gradually decreases, and eventually the determination of K <0.8Kx in step S9 is affirmed. That is, the current proportional constant K becomes less than 80% of the value of Kx = K set in step S6. In this case, it is determined that the amount of scale attached to the electrode has increased, and the process proceeds to scale cleaning control in steps S10 and S11.

In this control, first, the cleaning proportional constant Kx is cleared to "0" (step S10), and after cleaning Kx
To be able to update. Then, the energization from the power supply voltage 43 to the electrode sets 41, 42 is temporarily stopped, and the solenoid valves B2,
Close B3. Then, the electromagnetic valve B10 is opened to drain the water in the electrolytic cell 14 from the drain port 46. Then, the solenoid valve B10 is closed, the solenoid valve B9 is opened, and the constant flow pump 4
9 is operated. As a result, the acetic acid stored in the acetic acid solution tank 48 is supplied to the electrolytic tank 14 through the supply passage 47.
When the inside of the electrolytic cell 14 is filled with acetic acid, the constant flow pump 49 is stopped and the electromagnetic valve B9 is closed. Then, the electrolytic cell 14 is filled with acetic acid for about 10 minutes to clean the scale attached to the electrode sets 41 and 42. afterwards,
The solenoid valve B10 is opened to drain the acetic acid used for cleaning. Then, the solenoid valve B10 is closed, and the solenoid valves B2, B
3 is opened to end the scale cleaning control (step S1
1). Then, the process returns to step S2.

When the scale cleaning process is performed once, the proportional constant Kx is cleared to "0". Therefore, the proportional constant K calculated in step S2 after the scale cleaning is reset as the acetic acid cleaning proportional constant ( Steps S5, S
6). That is, each time the acetic acid cleaning is completed, the proportional constant Kx
Is updated and set. Therefore, immediately after Kx is updated and set, the determination in step S9 is denied, and thus step S9 is performed.
Steps S10 and S11 are skipped and the processing from step S2 is repeated. When the electrolysis in the electrolytic cell 14 is further continued, the determination in step S9 is eventually affirmed, and at that time, the acetic acid cleaning is performed again.

Since the acetic acid cleaning is performed at regular intervals as described above, the scale attached to the electrode set is automatically cleaned, and the electrolysis of the electrolytic cell 14 can be favorably performed for a long time. Eventually, the initial proportional constant K set in step S4
₀ will fall to 20% or less of the current proportionality constant K. In this case, it is determined that the surface catalyst of the electrode has been consumed and the electrode has corroded, and the lamp indicating that the life of the electrode is exhausted is turned on (step S8). The manager of the water treatment device 1
Based on the lighting of this lamp, the electrode sets 41 and 42 of the electrolytic cell 14 will be replaced.

FIG. 4 is a flow chart showing an example of electrolysis control in the electrolytic cell 14 of the water treatment device 1. Figure 4
In the flowchart of 1, the control is performed in which the residual chlorine concentration of the water to be treated becomes the concentration set by the setting unit 61 (see FIG. 2). 2 and 4, the control unit 60 reads the residual chlorine concentration X ₀ set by the setting unit 61 (step S21). Further, the detection signal X detected by the residual chlorine concentration sensor 31, that is, the current residual chlorine concentration X is read (step S22). Then, the magnitudes of X and X ₀ are compared (step S23).

If the detected current residual chlorine concentration X is less than or equal to the set residual chlorine concentration X ₀ , the amount of electrolysis required to bring the residual chlorine concentration of the water to be treated to the set residual chlorine concentration is calculated. The provisional electric power supply amount W ₀ to be supplied to the electrode sets 41 and 42 to obtain the electrolysis amount and the provisional flow rate Q ₀ of water to flow into the electrolytic cell 14 are set (step S24). After this, the safety subroutine step S
At 26, the provisional power supply amount W ₀ and the provisional flow rate Q ₀ are adjusted, and the amount of power supplied to the electrode sets 41 and 42 and the flow rate of water flowing into the electrolytic cell 14 are actually determined to control the output. (Step S27). Output control means power supply voltage 4
3, control of the electromagnetic valves B2, B3, the circulation pump 16 and the like.

In step S23, when the detected residual chlorine concentration X is higher than the set residual chlorine concentration X ₀ , electrolysis in the electrolytic cell 14 is unnecessary, so that the power supply voltage 43 to the electrode set 41, The power supply amount W ₀ to 42 is set to “0%”. Further, at this time, in order to secure a stable water pressure and flow rate to the residual chlorine concentration sensor 31, the intake amount of the water to be treated from the branch point J1 to the water channel 10 is the maximum that can flow into the water treatment device 1. The flow rate is set to about 20% of the flow rate, for example, 10 l / min in this embodiment (step S25).

By the above control, the residual chlorine concentration in the water tank 2 can be set to the desired concentration set by the setting section 61, and the electrolysis in the electrolytic cell 14 necessary for that can be safely executed. Next, the specific contents of the safety subroutine in step S26 will be described.

FIG. 5 is a flow chart showing the specific contents of the safety subroutine. In the safety subroutine,
First, the temperature T detected by the thermistor 40 provided in the electrolytic cell 14 is read by the controller 60 (step P1). Then, it is determined whether or not the temperature T is 50 ° C. or higher (step P2). When electrolysis is performed in the electrolytic cell 14, the temperature of the solution in the electrolytic cell 14 rises, but when the temperature rises to 50 ° C. or higher, a temperature abnormality display and a temperature abnormality notification are performed (step P3). ). Then, the temporary power supply amount W set in step S24 of FIG.
Change ₀ to 0%. Further, the provisionally set flow rate Q ₀ of water to the electrolytic cell 14 is set to the maximum flow rate introduced into the water channel 10 to cool the electrolytic cell 14, for example, 50 liters / minute in this embodiment (step. P3).

On the other hand, when the temperature T detected by the thermistor 40 is in the range of 40 ° C. <T <50 ° C. (when the judgment in step P2 is negative and the judgment in step P4 is affirmative), the temperature T is temporarily changed according to the temperature T. Reduce the set power supply amount,
Moreover, the temporarily set flow rate is increased. Specifically, the power supply amount W ₀ is W ₀ = 10 × (50−T)% and the flow rate Q
_{0 is set} to Q ₀ = 50 + 5 (50−T)% (step P
5).

It should be noted that the power supply amount W depending on the detected temperature T
_The above equations for changing ₀ and the flow rate Q ₀ are merely examples, and the power supply amount W ₀ and the flow rate Q ₀ may be adjusted based on other equations. Next, the water pressure in the electrolytic cell 14 is detected by the pressure gauge 51 (see FIG. 1) connected to the outflow side water channel of the electrolytic cell 14 (step P6). As a result, the water pressure P
Is determined to be P ≧ 1 kgf / cm ² (step 7), and if this determination is affirmed, a water pressure abnormality display and water pressure abnormality notification are made (step 8). That is, the electrolytic cell 14
It is considered that there is a problem such as an abnormal increase in the inflow water pressure into the water treatment system or a clogging of the water channel 10, and therefore the manager or the like of the water treatment device 1 is notified of this. Further, in this case, for safety, the power supply amount W ₀ to the electrode set 41 is set to 0%, and the solenoid valve B2 is closed to shut off the inflow of water into the electrolytic cell 14. In this case, if necessary, the solenoid valve B3 is closed, the circulation pump 16 is stopped, and the solenoid valve B3 is closed.
The water in the electrolytic cell 14 may be drained by opening 10 (step P12).

When the determination of the water pressure P in step P7 is denied and the water pressure P is in the normal range, the flow meter 15 detects the outflow side flow rate Q of the electrolytic cell 14, and the flow rate Q is a predetermined flow rate, that is, It is determined whether or not it is less than 5 liters / minute (step P10). When the outflow side flow rate Q is smaller than the set flow rate, it can be estimated that there is an abnormality such as clogging of the outlet side of the electrolytic cell 14, so that the flow rate abnormality display and the flow rate abnormality notification are performed (step P11). Also in this case, the process proceeds to step P12, the electrolysis in the electrolytic cell 14 is stopped, the electromagnetic valve B2 is closed, and the inflow of water into the electrolytic cell 14 is blocked.

By the above control, the water treatment device 1,
In particular, even if a problem occurs in the electrolytic cell 14 due to disturbance or failure, optimal operation can be safely performed. FIG. 6 is a simplified view showing a structure in which a water treatment device 100 according to another embodiment of the present invention is incorporated in a large-sized water tank 2 called a pool. This water treatment device 100 is the water treatment device 1 shown in FIG.
In addition to the electrolytic cell 14, a gas removal tank 70 as a gas liquid separation tank for separating gas generated during electrolysis in the electrolytic cell 14 from water is provided in addition to the electrolytic cell 14. On the outflow side of the electrolytic cell 14, the gas removal tank 70 is provided by the water channel 10 in which the regulating valve B10 and the flow meter 15 are interposed.
Connected to.

The gas removing tank 70 is equipped with a float switch 71 and separates the gas contained in the water while accumulating a certain amount of water. Then, the separated gas is discharged to the outside air via the exhaust pipe 72. The exhaust pipe 72 is provided with a hydrogen gas sensor 73 and a ventilation fan 74 for exhausting generated hydrogen gas, oxygen gas and the like via the exhaust pipe 72.

The water in the gas removing tank 70 has a filter 7 at the tip.
It is pumped by a waterway 10 provided with 5. Further, in this embodiment, the diversion channel 30 that branches off from the branch point J3.
Is connected to the gas removal tank 70, and the water that has passed through the residual chlorine concentration sensor 31 is not in the drain groove but in the gas removal tank 70.
It is configured to be returned to.

A circulation pump 76 is inserted in the inflow side water passage 10 of the electrolytic cell 14. Although not shown, the current flowing through the ventilation fan 74 is monitored by the control unit 60, and the current range flowing through the ventilation fan 74 is in the range of 0.1 to 1 [A] in a normal state. ing. In the water treatment device 100, the water channels 10 before and after the gas removal tank 70 are provided with flowmeters 15 and 17, respectively, so that the flow rate of water flowing through the gas removal tank 70 can be detected. Further, the flow rate control of the water flowing in the gas removal tank 70 is performed by the circulation pump 16 and the circulation pump 76. It is preferable that the water supply capacity of these two circulation pumps 16 and 76 can be adjusted steplessly by inverter control. The flow rate of the circulation pump 76 is controlled to be about 1 [liter / minute] higher than the flow rate of the circulation pump 16. However, when the float switch 71 operates, the circulation pump 76 is stopped. The water never overflows. As the float switch 71 of the gas removal tank 70,
For example, a hysteresis type can be used.

The other constitution is the water treatment apparatus 1 shown in FIG.
The same reference numerals are given to the same or corresponding parts, and the description of those components will be omitted. The basic operation of the water treatment device 100 shown in FIG. 6 is shown in FIG.
This is the same as the control in the flowchart shown in FIG. The control operation that characterizes the water treatment device 100 in FIG. 6 is the content of the safety subroutine. Next, the control contents of this characteristic safety subroutine will be described with reference to FIG.

In the safety subroutine shown in FIG. 7, the temporary power supply amount W ₀ and the temporary flow rate Q ₀ set in step S24 of FIG. 4 are adjusted to ensure safety. That is, the temperature detected by the thermistor 40 is read (step Q1), and the provisional set values of the power supply amount and the flow rate are adjusted according to the temperature. Specifically, when the temperature T of the electrolytic cell 14 detected by the thermistor 40 is 50 ° C. or higher,
Abnormal temperature display and notification of abnormal temperature are displayed (step Q
3). Then, while the temporary power supply amount W _{0 is set} to 0% to stop energization, the inflow flow rate Q ₀ into the electrolytic cell 14 is set to the maximum flow rate that can be introduced into the water channel 10 (in this implementation) in order to cool the electrolytic cell 14. In the example, it is set to 50 liters / minute). The operation of flowing the water at the set flow rate is realized by the circulation pump 16 and the circulation pump 76. By setting the flow rate of the circulation pump 76 on the inflow side to Q ₀ + α and setting the flow rate of the circulation pump 16 to Q ₀ , Good cooling is possible with the electrolytic cell 14 filled with water.

When the temperature T is in the range of 40 ° C. <T <50 ° C.
Is the temporary power supply W depending on the temperature.₀Decrease the set value of
And, along with that, the provisional flow rate set value Q₀Increase. Specifically
Is W ₀X (50-T)%, Q₀= 50 + 5 (50-
T)%, W₀And Q₀Set the value of
It The above control operation is substantially the same as the operation described in FIG.
Is the same.

Then, the hydrogen gas sensor 73 detects the hydrogen gas concentration H generated from the gas removing tank 70 (step Q6). If the detected concentration H exceeds the combustion limit lower limit value of 4%, hydrogen concentration abnormality display and hydrogen concentration abnormality notification are performed (step Q8).
In this case, the temporary power supply amount W ₀ is set to 0%.

The detected hydrogen concentration is 2% ≦ H <4.
In the range of%, the power supply amount Wx is calculated according to the concentration (step Q10). This calculation is performed, for example, with Wx
= 50 * (4-H)%. Then, the calculated power supply amount Wx is compared with the provisional power supply amount W ₀ (step Q11), and when Wx is small, it becomes the power supply amount (step Q12).

Next, the amount of current flowing through the ventilation fan 74 provided in the same exhaust path as the hydrogen gas sensor 73 is the ventilation fan ammeter 74a.
Is monitored at (step Q13). As a result, when the ventilation fan current I is 1 A or more or less than 0.1 A, it is considered that a problem such as locking or disconnection of the ventilation fan 74 has occurred, and the ventilation fan abnormality display and the ventilation fan abnormality notification are made (step Q1).
5). In that case, the temporary power supply amount W ₀ is set to 0%.

Further, the flow rate Q is measured by the outflow side flow meter 17.
Is detected (step Q16), and when the flow rate Q is less than 5 liters / minute, it is considered that air clogging of the circulation pump 16 or failure of the circulation pump 16 is the cause. Notification is given (step Q18). Then, the temporary power supply amount W _{0 is set} to 0%, the circulation pump 76 is stopped, and the solenoid valve B2 is closed,
The inflow of water into the electrolyzer 14 is blocked (step Q1).
9).

Finally, when the float switch 71 is turned on to detect fullness of the gas removal tank 70 (steps Q20 and Q21), the temporary power supply amount W _{0 is set} to 0%.
, The circulation pump 76 is stopped, the electromagnetic valve B2 is closed, and the inflow of water into the electrolytic cell 14 is blocked. After passing through such a safety subroutine, the process returns to the main routine shown in FIG. 4, and control is performed so as to match the adjusted power supply amount W ₀ and flow rate Q ₀ .

Although not described in the above embodiment, an inverter is installed in the ventilation fan 74 to control the rotation speed of the ventilation fan 74 according to the hydrogen gas concentration detected by the hydrogen gas sensor 73 to control the ventilation amount. It may be adjusted.
By performing the control including the safety subroutine as described above, it is possible to safely and appropriately control the water treatment device.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

[Brief description of drawings]

FIG. 1 is a schematic view showing a structure in which a water treatment device according to an embodiment of the present invention is incorporated in a water tank.

FIG. 2 is a block diagram showing an electrical configuration of a water treatment device.

FIG. 3 is a flowchart showing maintenance control of an electrolytic cell.

FIG. 4 is a flowchart showing an example of electrolysis control in an electrolytic cell of a water treatment device.

FIG. 5 is a flowchart showing the specific contents of a safety subroutine using a closed type electrolytic cell.

FIG. 6 is a schematic view showing a structure in which a water treatment device according to another embodiment of the present invention is incorporated in a water tank.

FIG. 7 is a flowchart showing the specific contents of a safety subroutine when a gas-liquid separation type electrolytic cell is used.

[Explanation of symbols]

1,100 water treatment equipment 10 waterways 13 Conductivity sensor 14 Electrolyzer 15,17 Flowmeter 16,21,76 Circulation pump 31 Residual chlorine concentration sensor 40 thermistor 41 Positive side electrode set 42 Negative electrode set 43 Power supply voltage 44 ammeter 48 Acetic acid solution tank 51 pressure gauge 60 control 61 Setting section 70 Gas removal tank 73 Hydrogen gas sensor 74 Ventilation fan B2, B3, B9, B10 Solenoid valve

Front page continued (72) Inventor Kazushi Kawamura 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tatsuya Hirota 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (56) Reference JP-A-6-335681 (JP, A) JP-A-8-308909 (JP, A) JP-A-8-206659 (JP, A) JP-A-6-320162 ( JP, A) JP 9-1145 (JP, A) JP 2000-37689 (JP, A) JP 3-293093 (JP, A) JP 9-253650 (JP, A) JP 6-246271 (JP, A) JP-A-8-39071 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/46 C02F 1/76

Claims (2)

(57) [Claims] 1. It has an electrode and is provided by energizing the electrode.
Electrolysis to sterilize the supplied water to be treated by electrochemical reaction
The gas generated during the electrochemical reaction in the cell and the electrolytic cell is separated from water.
In a water treatment device having a gas-liquid separation tank to be separated, a hydrogen concentration detecting means provided in the gas-liquid separating tank and energization of electrodes are controlled based on a signal from the hydrogen concentration detecting means.
Water treatment apparatus comprising: the Gosuru power supply amount control means. 2. It has an electrode and is provided by energizing the electrode.
Electrolysis to sterilize the supplied water to be treated by electrochemical reaction
The gas generated during the electrochemical reaction in the cell and the electrolytic cell is separated from water.
In a water treatment device having a gas-liquid separation tank to be separated, an exhausting means for forcibly exhausting the gas separated in the gas-liquid separation tank
Stage, means for detecting the exhaust state of the exhaust means, and control the amount of electricity to the electrode based on the detection signal of the detection means
Water treatment device, characterized in that it comprises means, the for.