JPH10244275A - Water quality purification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water quality purifying device utilizing the filtration capability of a filter tank to the maximum by preventing the proliferation of bacteria in the filter tank. SOLUTION: A chemical fluid tank 60 for storing a chemical fluid for removing and sterilizing bacteria in a filter tank 10 is provided, and a chemical fluid circulating circuit 70 is constituted between the filter tank 10 and the chemical fluid tank 60. A third solenoid valve 82 and a chemical fluid pump 81 are set on an ongoing line 80 of the chemical fluid circulating circuit 70, while a fourth solenoid valve 91 is set on a return line 90 of the chemical fluid circulating circuit 70. A solenoid valve 25 is set on an inflow line 20 of a water circulating circuit 40 constituted between the filter tank 10 and a bathtub 100, while a second solenoid valve 31 is set on an outflow line 30 of the water circulating circuit. The four solenoid valves 25, 31, 82 and 91 are opened and closed, and the water circulating circuit 40 is closed every one hour, and the chemical fluid is transferred from the ongoing line 80 to the filter tank 10 to carry out the removal and sterilization of bacteria in the filter tank 10. Then the chemical fluid is returned from the return line 90 to the chemical fluid tank 10 and the normal operation is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a water purification device. More specifically, the present invention relates to a water purification device provided with a sterilizing means for a filtration tank.

[0002]

2. Description of the Related Art In recent years, a large number of simple water purification devices, so-called 24-hour baths, which can be attached to a bath tub so that they can take a bath at home at any time, have been developed. These water purification devices generally include a filtration tank that physically absorbs pollutants in bath water using activated carbon or the like, a filtration tank that physically filters pollutants using a filter, or a ceramic tank. 2. Description of the Related Art A filtration tank or the like for purifying a living body using aerobic bacteria propagated in a ball or the like is used.

FIG. 7 is a schematic explanatory view showing an example of a conventional water purification device D. The water purification apparatus D utilizes a purification substance that aggregates and precipitates pollutants in bath water, and physically filters the aggregated and precipitated pollutants.

[0004] The filtration tank 10 of the water purification device D is composed of activated carbon for performing physical adsorption and a filter for performing physical filtration. A water inlet 20 is provided on the inlet side of the filter tank 10. Bath water in the bathtub 100 is pumped from the water inlet 20 into the filter tank 10 by a circulation pump 21. A water outlet 30 is provided on the outlet side of the filter tank 10, and the filtered bath water is returned to the bathtub 100 by natural fall through the water outlet 30. Thus, in the water purification device D, the water inlet 20 and the water outlet 3
A water circulation circuit 40 for circulating bath water between the filtration tank 10 and the bathtub 100 is constituted by 0.

The water inlet 20 is provided with a circulation solenoid valve 22 for opening and closing the water circulation circuit 40 and a heater 23 for heating the bath water pumped up by the circulation pump 21. In addition, a filter 24 such as a hair catcher for removing large debris in bath water such as hair is provided at the end of the water inlet channel 20 on the bathtub side.

Further, the water purification apparatus D is provided with a storage tank 50 for storing a purification substance and a purification substance introduction means for introducing the substance into the bathtub 100. The purifying substance charging means 50 includes a charging electromagnetic valve 51 and a charging path 52 for controlling charging of the purifying substance from the storage tank 50. The purifying substance is dropped into the bathtub 100 by natural fall from the storage tank 50, and by opening the charging solenoid valve 51, a fixed amount, for example, every 48 hours, For example, about 60 ml of a purifying substance is supplied from the charging path 52 to the bathtub 10.
It is thrown into 0.

This purifying substance has an effect of coagulating and precipitating pollutants in the bath water, and the pollutants in the bath water are coagulated and precipitated by the supplied purifying substance.
Therefore, the circulation electromagnetic valve 22 is opened, and the circulation pump 21 is opened.
The bath water is pumped into the filtration tank 10 together with the contaminated and precipitated pollutants, and the filtration tank 10
And filtered. Then, the filtered bath water is supplied to the flood channel 30.
From the bathtub 100.

Further, the bath water pumped by the circulation pump 21 is heated to a constant temperature by the heater 23, so that the temperature of the bath water is kept constant. In this way, by using the water purification device D, the bath water is kept clean and a comfortable bath can be taken at any time.

However, in this water purification apparatus D, pollutants in the bath water accumulate in the filtration tank 10 and are maintained at an appropriate temperature, so that bacteria and the like easily grow. Therefore, there is a problem that the activated carbon and the filter in the filtration tank 10 must be replaced at an early stage in order to remove bacteria, despite the ability to sufficiently filter. In addition, the filter must be frequently cleaned for sterilization and removal, and the sterilization and removal operation in the filtration tank 10 must be frequently performed.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to prevent bacteria from growing in the filtration tank so that the filtration capacity of the filtration tank can be maximized. It is to provide a water purification device.

[0011]

According to the present invention, there is provided a water purification apparatus comprising: a storage tank for storing a purification substance for coagulating and precipitating pollutants in water; and a purification tank for storing the purification substance stored in the storage tank. A purifying substance charging means for charging, a filtration tank for filtering pollutants in water, a circulation pump for circulating water in the water tank to the filtration tank, and a water circulation circuit between the water tank and the filtration tank. In a water purification device comprising an inlet and an outflow channel, a chemical tank for storing a chemical for disinfecting or sterilizing the filtration tank, and a chemical pump for sending the chemical in the chemical tank to the filtration tank, It is characterized by comprising a chemical liquid circulation circuit provided between the filtration tank and the chemical liquid tank.

At this time, for example, a first solenoid valve is provided in the water inlet channel and a second solenoid valve is provided in the water outlet channel, and a third solenoid valve is provided on the inlet side of the filter tank in the chemical liquid circulation circuit. A fourth solenoid valve may be provided on the outlet side of the filtration tank in the chemical liquid circulation circuit.

Further, it is preferable to provide a branch having an on-off valve on the outlet side of the filtration tank in the chemical liquid circulation circuit.

[0014] Further, there are provided control means and a timer for controlling the first to fourth electromagnetic valves, the circulating pump, and the chemical solution pump, and the third electromagnetic valve and the fourth electromagnetic valve are closed. Opening the first solenoid valve and the second solenoid valve, normal operation of circulating water in the water tank by the water circulation circuit, and closing the first solenoid valve and the second solenoid valve, A first step of opening a third electromagnetic valve, operating the chemical liquid pump to feed the chemical liquid to the filtration tank by the chemical liquid circulation circuit, and closing the fourth electromagnetic valve to add a chemical liquid to the filtration tank; And a third step of opening the fourth solenoid valve and returning the chemical solution from the filtration tank to the chemical solution tank, and performing a sterilization and disinfection operation including the second step of maintaining the state satisfying the above condition. ,
It is convenient to stop the normal operation every time a certain time elapses and to provide a control unit for performing the sterilization / sterilization operation.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a water purification apparatus A according to an embodiment of the present invention, FIG. 2 is a sectional explanatory view showing a part of the water purification apparatus A, and FIG. It is a timing chart which shows the operation control method in the purification device A. The details will be described below with reference to the drawings.

In the water purification apparatus A, bath water is supplied to the entrance side of the filtration tank 10 in the same manner as the conventional water purification apparatus A.
A water inlet 20 is provided for pumping the water to zero.
A water outlet 30 for returning the bath water filtered by the filter tank 10 into the bath tub 100 is provided on the outlet side of the tank 0, and the water inlet 20 and the water outlet 30 allow the water between the bath tub 100 and the filter tank 10. A water circulation circuit 40 is configured.

The filtration tank 10 can be made of, for example, a membrane filter, a hollow fiber filter, or a ceramic ball which performs activated carbon or physical filtration as in the conventional water purification apparatus D.

The water inlet 20 includes a first solenoid valve 25 for opening and closing the water inlet 20, a circulation pump 21 for pumping bath water from the bathtub 100, and a heater 23 for heating the bath water pumped by the circulation pump 21. Provided.
The end of the water inlet 20 on the side of the filtration tank 10 is connected to the upper end of the filtration tank 10, and the end of the water tub 100 is provided with a filter 24 such as a hair catcher for removing large debris in the bath tub 100 such as hair. .

The water passage 30 is provided with a second solenoid valve 31 for opening and closing the water passage 30. In addition, flood channel 30
Is connected to the lower end of the filtration tank 10, preferably to the bottom of the filtration tank 10.

Further, the water purification apparatus A has a storage tank 50 for storing a purification substance and a bathtub 100 for storing the purification substance.
Purification substance charging means for charging the inside is provided. The purifying substance charging means includes a charging electromagnetic valve 51 and a charging path 52 for controlling charging of the purifying substance from the storage tank 50. This purifying substance can be thrown in by natural fall, similarly to the water purification apparatus A of the conventional example, and the purifying substance is thrown in by opening and closing the throwing electromagnetic valve 51.

An air cock 200 is provided at the end of the charging path 52.
Is provided. As shown in FIG. 2, the air cock 200 includes a plastic cock body 210 formed of a substantially cylindrical shape with one end closed, and a screw portion 220. The cock body 210 has two inner chambers 240, 2
50 are formed, and a vent 231 is opened in a central partition wall 230 that forms the two inner chambers 240 and 250. First inner chamber 2 into which screw portion 220 is screwed
A female screw 242 is formed on an inner wall of the first inner chamber 40, and the first inner chamber 240 is provided with a first entrance portion 241 for connecting a sound deadening ball 300 described below. Also,
The remaining second inner chamber 250 is provided with a second entrance path 251 for connecting the charging path 52 and an exit path 252 for connecting the blowing nozzle 400.

The screw portion 220 is composed of a screw body 221 having a substantially frusto-conical tip and a closing portion 222 for closing a vent 231 provided in the partition wall 230. The closing part 222 is made of, for example, rubber having heat resistance and elasticity. Further, the female screw 2 of the cock body 210 is provided on the outer peripheral surface of the screw body 221.
An external thread 223 that is screwed into the screw section 220 is formed.
Is screwed into the back of the cock main body 210. As a result, the closing portion 222 is provided on the partition wall 230 and the vent 23
1 is closed. Further, by opening the screw part 220, the closing part 222 separates from the partition wall 230, and the vent 23
1 is opened. Therefore, from the first inner chamber 240 to the second
The amount of air flowing into the inner chamber 250 can be adjusted by the screw 220.

The first entrance 241 of the air cock 200
Has a hose 34 with a sound-absorbing ball 300 connected to its tip.
0 is connected. As shown in FIG. 2, the sound-absorbing ball 300 has a small air hole 320 formed in a hollow spherical ball body 310, and the other end of the hose 340 is connected to a connection portion 330 protruding from the ball body 310. Connected.

As shown in FIG. 2, the blowing nozzle 400 has a partition 420 in the center of a substantially cylindrical nozzle body 410 having one end closed.
40 are formed. The first inner chamber 430 having the opening 432 is provided with a first inlet section 431 connected to the outlet section 252 of the air cock 200, and the remaining second inner chamber 440 is provided with the water purification device A of the water purification device A. A second entrance section 441 that connects the flood channel 30 is provided. The hose 260 connected to the outlet of the air cock 200 is connected to the first inlet 431. Also, the second entrance section 44
1 is connected to a flood channel 30. The partition wall 420 is provided with a water passage hole 421 at substantially the center thereof.

The water purification device A further includes a filtration tank 1
Chemical tank 6 for storing a chemical for sterilizing or sterilizing 0
0 is provided, and between the chemical tank 60 and the filtration tank 10, a chemical circulation circuit 70 for circulating the chemical is provided. As the chemical solution, for example, a chemical solution having a disinfecting or sterilizing effect such as an aqueous solution of chlorinated water or sodium hypochlorite can be used. Further, among the purifying substances, there are purifying substances having a disinfecting or sterilizing effect,
For example, it contains as a main component a salt and / or a double salt of a plurality of metals and nonmetals and an inorganic acid obtained by dissolving and extracting a metamorphic rock of nachydine mainly composed of chlorite (chlorite) with an inorganic acid. Purifying substances can be used. And these purifying substances are used as it is as undiluted solution for sterilization or sterilization,
Further, it is used as a stock solution as it is or after being appropriately diluted, for coagulation and precipitation in a bathtub. Of course, it may be diluted to an appropriate concentration and used as a drug solution.

A fourth solenoid valve 91 is provided on the return path 90 connecting the filtration tank 10 and the chemical solution tank 60. The end of the return path 90 on the side of the filtration tank 10 is connected to the water discharge path 30 constituting the water circulation circuit 40 on the filtration tank 10 side of the installation position of the second solenoid valve 31.

The chemical tank 60 is desirably provided with the filtration tank 10.
Liquid tank 60 and the filtration tank 1
A chemical pump 81 and a third solenoid valve 82 are provided on the outward path 80 connecting the first solenoid valve 0 and the third solenoid valve 82. The end of the outward passage 80 on the side of the filtration tank 10 is connected to the water inlet 20
Are connected on the filtration tank 10 side of the installation position of the first solenoid valve 25.

In the water purification apparatus A, the filter tank 10 is automatically sterilized or sterilized by the chemical stored in the chemical tank 60 every time a predetermined time elapses. That is, the first to fourth solenoid valves 25, 3 except for the closing solenoid valve 51 among the above five solenoid valves.
1, 82, 91, circulation pump 21 and chemical liquid pump 81
Is controlled by a control unit having a timer (not shown), and by opening and closing these four solenoid valves 25, 31, 82, and 91 and turning on and off the circulation pump 21 and the chemical solution pump 81, the sterilization of the filtration tank 10 is performed at regular intervals. Alternatively, sterilization is performed.

Next, an operation control method in the water purification apparatus A will be described.

[Normal Operation] After bath water of a certain temperature is filled in the bathtub 100, when the water purification device A is turned on, the charging solenoid valve 51 is opened, and the purification substance in the storage tank 50 is discharged. After a certain amount of free fall, the water is sent from the charging path 52 to the air cock 200 and further sent to the blow nozzle 400 through the hose 260. Also, a timer is activated.

The control unit closes (OFF) the third solenoid valve 82 and the fourth solenoid valve 91 and sets the first solenoid valve 25
Then, the second solenoid valve 31 is opened (ON), and at the same time, the circulation pump 21 is turned on. When the circulation pump 21 is turned on, the bath water is filtered by a filter 24 such as a hair catcher, and further heated or kept at a certain temperature by the heater 23 and pumped into the filtration tank 10.

The bath water pumped up in the filtration tank 10 is filtered for pollutants by the filtration tank 10, and is sent out to the blowing nozzle 400 through the water outlet 30. The discharged bath water is supplied to the second inner chamber 440 of the blowing nozzle 400.
Through the water passage hole 421 to the first inner chamber 430.

At this time, when the bath water passes through the water passage hole 421, its flow force is increased. On the other hand, the air cock 20
0 screw part 220 is opened, the
The air is sucked from the air hole 320 of the air cock 200 and is sucked into the first inner chamber 240 of the air cock 200. The inhaled air flows from the ventilation port 231 to the second inner chamber 250, and the air together with the purifying substance flows from the second inner chamber 250,
The air is sent out to the first inner chamber 430 of the blowing nozzle 400. Then, the purifying substance and the air sent from the air cock 200 and the bath water are mixed and discharged into the bathtub 100 from the opening 432 of the blowing nozzle 400 with vigor.

Therefore, in the bathtub 100, the bath water and the purifying substance are sufficiently stirred, and pollutants in the bath water are flocculated and deposited by the coagulation and precipitation effect of the purifying substance. Then, the polluted substances that have been aggregated and deposited are removed by the filtration tank 10.

[Sterilization / sterilization operation] After a lapse of a predetermined time (T time) from the start of the operation, the control unit performs the sterilization / sterilization operation. When the sterilization / sterilization operation is started, the control unit performs the first
The electromagnetic valve 25 and the second electromagnetic valve 31 are closed, and the circulation pump 21 is turned off. Next, the third electromagnetic valve 82 is opened, and the chemical liquid pump 81 is turned on for a time t1. When the chemical liquid pump 81 is turned on for a time t1, a certain amount of chemical liquid, that is, an amount of chemical liquid enough to fill the filtration tank 10 is sent from the chemical liquid tank 60 to the filtration tank 10. When the liquid feeding is completed, the control unit turns off the chemical liquid pump 81, closes the third electromagnetic valve 82, and holds the state for a certain time (t2 hours) until the filtration tank 10 is sterilized and sterilized.

Thereafter, when a predetermined time (time t2) has elapsed, the control section opens the fourth solenoid valve 91, and the chemical filled in the filtration tank 10 is discharged to the chemical tank 60. At this time, since the chemical tank 60 is disposed below the filtration tank 10, the chemical in the filtration tank 10 is discharged to the chemical tank 60 by natural fall. Although the return path 90 of the chemical liquid longitudinal circuit 70 is shown above the filtration tank 10 in the drawing, the return liquid 90 is actually disposed so as not to hinder the discharge of the chemical liquid.

Next, the control unit operates for the time t3, that is, the filtration tank 1
After opening the fourth solenoid valve 91 for a time period from 0 to a time sufficient to sufficiently discharge the chemical, the fourth solenoid valve 91 is closed.
Then, the first solenoid valve 25 and the second solenoid valve 31 are opened,
The circulation pump 21 is turned on, the timer is reset, and the operation returns to the normal operation.

As described above, the control unit starts the disinfection / sterilization operation when the normal operation is performed for a certain period of time to disinfect or sterilize the filtration tank 10.

Therefore, in the water purification apparatus A, since the filter tank 10 is sterilized and sterilized by a chemical solution at regular intervals, bacteria do not propagate in the filter tank 10 and a comfortable 24-hour bath is provided. Can be provided. As a result, the filtration capacity of the filtration tank 10 can be maximized.

In particular, in the present invention, the chemical can be recycled by the chemical circulation circuit 70, and the chemical can be used effectively. In addition, if a chemical solution that can be used as a purification substance as described above is used, it is possible to remove bacteria.
The chemical solution remaining in the filtration tank after the sterilization operation is discharged into the bath tub together with the pumped water, so that the chemical solution can be used efficiently.

In this embodiment, the chemical tank 6
Although the case where 0 is provided at a position lower than the filtration tank 10 has been described, there may be a case where the chemical solution tank 60 cannot be provided at a position lower than the filtration tank 10 due to the structure of the filtration tank 10 or the like. In this case, a discharge pump 92 may be further provided in the return path 90 of the chemical liquid circulation circuit 70 as shown in the water purification device B in FIG.

In this water purification apparatus B, as shown in the timing chart of FIG. 5, when the control unit performs the normal operation for T hours from the start of operation, the first solenoid valve 25 and the second electromagnetic valve 25
Is closed and the circulating pump 21 is turned off to stop the normal operation. Next, the operation is switched to the sterilization / sterilization operation, the third electromagnetic valve 82 is opened, and the chemical liquid pump 81 is operated for a certain time (t1 time) to send the chemical liquid to the filtration tank 10. Then, the state is maintained for only t2 hours, and the filtration tank 10 is sterilized and sterilized. Thereafter, the third electromagnetic valve 82 may be closed and the fourth electromagnetic valve 91 may be opened, and the discharge pump 92 may be turned on for the time t3 to discharge the chemical solution in the filtration tank 10.

FIG. 6 is a schematic structural view of still another water purification device C. In this water purification device C, a return valve 96 is provided in a return path 90 constituting the chemical liquid circulation circuit 70. A branch 95 is provided. Therefore, in this chemical liquid circulation circuit 70. When the effect of the chemical is lost, the discharge valve 96 can be opened to discharge the chemical. In addition, the pollutants accumulated in the filtration tank 10 can be drained out together with the discharge of the chemical solution, so that the filtration tank 10 can be washed at the same time.

Of course, the present invention is not limited to the above embodiment, and it goes without saying that the present invention can be applied to other than a so-called 24-hour bath.

[0045]

According to the water purification apparatus of the present invention, a storage tank for storing a purification substance that coagulates and precipitates pollutants in water, and the purification substance stored in the storage tank is put into a water tank. A purifying substance input means, a filtration tank for filtering pollutants in water, a circulation pump for circulating water in the water tank to the filtration tank, and a water circulation circuit between the water tank and the filtration tank. In a water purification device including an inlet channel and an outlet channel, a chemical tank for storing a chemical for sterilizing or sterilizing the filtration tank, a chemical pump for sending a chemical in the chemical tank to the filtration tank, Since a chemical liquid circulation circuit is provided between the filtration tank and the chemical liquid tank, the filtration tank can be sterilized and sterilized with a chemical liquid as needed. Therefore, it is possible to reduce the number of washings for sterilization and sterilization, and to make full use of the filtration capacity of the filtration tank.

Further, since the chemical solution is circulated, the chemical solution can be reused, and a water purification device without waste can be provided.

For example, a first solenoid valve is provided in the water inlet channel, and a second solenoid valve is provided in the water outlet channel. By providing the fourth solenoid valve on the filter tank outlet side of the circuit, the water circulation circuit and the chemical liquid circulation circuit can be configured as separate circuits. In this water purification device,
By controlling the opening and closing of the two solenoid valves, it is possible to easily switch between sterilization of the filtration tank and normal operation.

Further, on the exit side of the filtration tank of the chemical liquid circulation circuit,
If a branch path provided with an on-off valve is provided, a used chemical solution can be discharged from the branch path. At this time, the pollutants accumulated in the filtration tank are simultaneously discharged, and the filtration tank can be washed at the same time.

[0049] Further, there are provided control means and a timer for controlling the first to fourth electromagnetic valves, the circulating pump and the chemical solution pump, and the third electromagnetic valve and the fourth electromagnetic valve are closed. The first solenoid valve and the second solenoid valve
Opening the solenoid valve of the above, the normal operation of circulating the water in the water tank by the water circulation circuit, the first solenoid valve and the second
And closing the third solenoid valve,
A first step of operating the chemical pump to feed the chemical to the filtration tank through the chemical circulation circuit;
Closing the electromagnetic valve of the second step of maintaining the state filled with the chemical solution in the filtration tank, and opening the fourth electromagnetic valve,
A third method of returning the chemical from the filtration tank to the chemical tank;
And a sterilization / sterilization operation having the steps of: performing the sterilization / sterilization operation, stopping the normal operation every predetermined time, and providing a control unit for performing the sterilization / sterilization operation. For example, a 24-hour bath suitable for performing automatic operation can be provided.

In particular, by using a purifying substance having a disinfecting and sterilizing effect in the chemical, the chemical remaining in the filtration tank can be directly reduced as a purifying substance into the water tank.
For this reason, it is not necessary to wash the filtration tank after the sterilization and sterilization, and the operation can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water purification device according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory diagram showing a part of the water purification device of the above.

FIG. 3 is a timing chart showing an operation control method in the water purification device of the above.

FIG. 4 is a schematic configuration diagram of a water purification device according to another embodiment of the present invention.

FIG. 5 is a timing chart showing an operation control method in the water purification device of the above.

FIG. 6 is a schematic configuration diagram of a water purification device according to still another embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a conventional water purification device.

[Explanation of symbols]

 Reference Signs List 10 filtration tank 25 first electromagnetic valve 31 second electromagnetic valve 40 water circulation circuit 50 storage tank 51 charging electromagnetic valve 60 chemical liquid tank 70 chemical liquid circulation circuit 80 forward path of chemical liquid circulation circuit 81 chemical liquid pump 82 third electromagnetic valve 90 chemical liquid Return path of circulation circuit 91 Fourth solenoid valve 100 Bathtub

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/50 560 C02F 1/50 560E B01D 35/027 B01D 35/02 J

Claims (5)

[Claims] 1. A storage tank for storing a purifying substance for coagulating and precipitating pollutants in water, a purifying substance charging means for charging the purifying substance stored in the storage tank into a water tank, and Water purification comprising a filtration tank for filtering substances, a circulation pump for circulating water in the water tank to the filtration tank, and an inlet and an outlet forming a water circulation circuit between the water tank and the filtration tank. In the apparatus, a chemical tank for storing a chemical for sterilizing or disinfecting the filtration tank, a chemical pump for feeding the chemical in the chemical tank to the filtration tank, and provided between the filtration tank and the chemical tank A water purification device comprising: a chemical circulation circuit provided. 2. A method according to claim 1, further comprising: a first solenoid valve provided in said water inlet passage, a second solenoid valve provided in said water outlet passage, and a third solenoid valve provided on a filter tank inlet side of said chemical liquid circulation circuit. The water purification device according to claim 1, further comprising a fourth solenoid valve provided on a circuit tank outlet side of the circuit. 3. The water purification apparatus according to claim 1, wherein a branch path provided with an on-off valve is provided on an outlet side of the filtration tank of the chemical liquid circulation circuit. And a timer for controlling the first to fourth solenoid valves, the circulating pump, and the chemical liquid pump, and closing the third solenoid valve and the fourth solenoid valve. Opening the first solenoid valve and the second solenoid valve,
A normal operation of circulating water in a water tank by the water circulation circuit; closing the first solenoid valve and the second solenoid valve, opening the third solenoid valve, operating the chemical pump, and operating the chemical solution. A first step of sending a chemical solution to the filtration tank by a circulation circuit, a second step of closing the fourth electromagnetic valve to maintain a state in which the filtration tank is filled with the chemical solution, Opening a solenoid valve, a third step of returning the drug solution from the filtration tank to the drug solution tank, and performing a disinfection / sterilization operation having a third step. After a certain period of time, the normal operation is stopped. 4. The control device according to claim 2, further comprising a control unit for performing a disinfection operation.
A water purification device according to claim 1. 5. The water purification device according to claim 1, wherein the purifying substance is used for the chemical liquid.