JP3775017B2 - Circulating warm bath and electrode cleaning method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circulating bath and an electrode cleaning method that have functions of aggregating treatment (purification) by aluminum electrolysis and heat insulation, and circulating and reusing bath water of a bath.
[0002]
[Prior art]
In recent years, bath water once used has been circulated through pre-filters (hair catchers), filtration tanks, activation tanks, heaters, etc. using a circulation pump to remove, activate, and heat the bathtub water. Circulating baths for heat insulation have come to be used in general household baths.
[0003]
At present, most circulating hot water baths in the market purify and deodorize bathtub water using biological treatment, but those that perform agglomeration treatment by aluminum electrolysis have also attracted attention. In addition to removing dirt from bath water, it is necessary to prevent the generation of malodors, E. coli, Legionella spp., Pseudomonas aeruginosa, etc. Those that are provided with ozone treatment, those that are sterilized with silver antibacterial agents, and those that are equipped with an electrolyzer that electrolyzes the bath water to return acid water to the bath water, etc. have been developed Yes.
[0004]
Hereinafter, a conventional circulating warm bath using aluminum electrolysis will be described with reference to the drawings.
[0005]
FIG. 7 is a schematic system diagram of a conventional circulating bath.
In the figure, 1 is a bathtub, 2 is bathtub water, 3 is a nozzle unit disposed in the bathtub 1, 4 is a water supply port through which the bathtub water 2 is supplied into the nozzle unit 3, and 5 is supplied from the water supply port 4. A check valve for preventing the reverse flow of the bathtub water 2, 6 is a pre-filter (hair catcher) made of a mesh mesh made of a resin such as sponge or polypropylene, a spool filter, and 7 is connected to the nozzle unit 3 via a circulation pipe 8. A conventional circulating hot water bath body connected, 9 is a flow sensor for detecting the flow rate of the bath water 2 from the nozzle unit 3 provided in the circulating pipe 8, 10 is a temperature sensor, and 11 is a circulating pump of the circulating hot water bath body 7. , 12 is a sterilizer for sterilizing and deodorizing the bathtub water 2 sent from the circulation pump 11 using ultraviolet rays or ozone, 13 is a circulation pipe connecting the circulation pump 11 and the sterilizer 12, and 14 is An excess tank, 15a and 15b are circulation pipes connecting the sterilizer 12 and the filtration tank 14, 16 is a three-way valve disposed at a connection point of the circulation pipes 15a and 15b, and 17 is for heat sterilization and heat insulation of the filtration tank 14. The heater 17a is a temperature sensor of the filtration tank 14, 18 is an aluminum electrode disposed in the filtration tank 14, 19 is a SUS electrode disposed in the filtration tank 14, and 20 is disposed in the filtration tank 14. Filter medium made of sand such as glass beads, ceramic balls, alumina, etc., 21 is a jet nozzle that returns the bathtub water 2 circulated in the circulating bath body 7 to the bathtub 1, and 22a, 22b, 22c are the circulating bath body 7 and jet. A circulation pipe to which the nozzle 21 is connected, 23 is a three-way valve disposed at the connection point of the circulation pipes 22a and 22b, 24 is a three-way valve disposed at the connection point of the circulation pipes 22b and 22c, and 25 is Backwash drain for draining the wash water that washed the circulating bath body 7, 26 is a backwash pipe connecting the three-way valve 16 and the backwash drain 25, and 27 is a backwash connecting the three-way valve 23 and the circulation pipe 13. Pipe, 28 is a circulation pipe connecting the three-way valve 24 and the circulation pipe 8, 29 is a power supply unit of the circulation warm bath main body 7, 30 is a control unit of the circulation warm bath main body 7, and 31 is a display and operation of the circulation warm bath main body 7. Part.
[0006]
Hereinafter, the operation of the conventional circulating warm bath configured as described above will be described with reference to the drawings.
[0007]
FIG. 8 is a diagram showing the flow of bath water during normal circulation of the circulating hot water bath, FIG. 9 is a diagram showing the time of sterilization of the circulating hot water bath filter tank, and FIG. 10 is the heat sterilization circulation of the circulating hot water bath. It is the figure which showed the flow of the bathtub water at the time, and FIG. 11 is the figure which showed the flow of the bathtub water at the time of the backwashing of a circulation warm bath.
[0008]
First, the normal circulation of the circulating bath will be described with reference to FIG.
When the normal circulation operation is started by the control unit 30, the three-way valve 16 is switched in the a → c direction, and the three-way valves 23 and 24 are switched in the c → a direction. Next, the circulation pump 11 is driven, and the bathtub water 2 in the bathtub 1 is sucked up from the water supply port 4 of the nozzle unit 3, passes through the prefilter 6, and the hair such as hair contained in the bathtub water 2 is large by the prefilter 6. Dust is collected and further flows into the circulation pump 11 through the flow pipe 9 and the temperature sensor 10 via the circulation pipe 8.
[0009]
Here, in order to prevent a decrease in the circulation flow rate, the prefilter 6 (especially when it is made of sponge or the like) is periodically taken out once every 1 or 2 weeks to remove large dust such as attached hair. . Further, in the case of the prefilter 6 composed of a pincushion filter, when the circulating flow rate of the bathtub water 2 falls below a certain flow rate, it is detected by the control unit 30 and the time for cleaning or replacing the prefilter 6 by the display and operation unit 31 is detected. it's shown.
[0010]
Next, the bathtub water 2 sent out from the circulation pump 11 is sterilized and deodorized by the sterilizer 12 using ultraviolet light, ozone, or the like, and flows into the filtration tank 14 through the three-way valve 16.
[0011]
In the filtration tank 14, the aluminum electrode 18 is used as an anode and the SUS electrode 19 is used as a cathode to conduct an electric current between both electrodes to perform aluminum electrolysis of the bath water 2, and aluminum hydroxide is eluted into the bath water 2. Aluminum is used to agglomerate small dust and dirt (organic substances such as inorganic substances, proteins and lipids) which are suspended in the bathtub water 2. Next, aggregates such as small dust and dirt (organic substances such as inorganic substances, proteins and lipids) that could not be removed by the prefilter 6 by the filter medium 20 made of glass beads, ceramic balls, sand such as alumina, etc. in the filtration tank 14. Filtered (generally referred to as purification). The temperature of the bathtub water 2 is controlled by a heater 17 and a temperature sensor 17a for heat sterilization and heat retention of the filtration tank 14.
[0012]
The bathtub water 2 purified in the filtration tank 14 is returned from the jet nozzle 21 to the bathtub 1 through the three-way valves 23 and 24.
[0013]
Next, the sterilization of the circulating warm bath filter tank 14 will be described with reference to FIG.
When the sterilization of the circulating warm bath filter tank 14 is started by the control unit 30, the three-way valve 23 is switched in the c → b direction, the circulation pump 11 is stopped, and the circulation of the bath water 2 is stopped.
[0014]
Next, the bath water 2 in the filtration tank 14 is heated to a temperature of 70 ° C. to 85 ° C. by the heater 17 of the filtration tank 14 to sterilize Legionella and Pseudomonas aeruginosa in the filtration tank 14. The electrode is washed by adding citric acid, acetic acid, malic acid or the like to the bath water 2 as needed to circulate and take the scale, or by taking out the electrode and washing it manually.
[0015]
Next, the heat sterilization circulation of the circulating bath will be described with reference to FIG.
When the heat sterilization circulation operation is started by the control unit 30, the three-way valve 23 is switched in the c → a direction and the three-way valve 24 is switched in the c → b direction, and the circulation pump 11 is operated to close as shown in FIG. A circuit circulation system is formed.
[0016]
The bath water 2 in the filtration tank 14 heated to a temperature of 70 ° C. to 85 ° C. returns again to the filtration tank 14 through the circulation pump 11 and the sterilizer 12 via the three-way valves 23 and 24, and in the closed circuit circulation system. It circulates and heat-sterilizes Legionella, Escherichia coli, Pseudomonas aeruginosa and the like in the filtration tank 14 and the circulation pipes 8, 13, 15a, 15b, 22a, 22b, 28.
[0017]
Next, the backwashing of the circulating bath will be described with reference to FIG.
When the backwashing operation is started by the control unit 30, the three-way valve 23 is switched in the b → c direction, and the three-way valve 16 is switched from c → b.
[0018]
The bath water 2 supplied from the water supply port 4 by the circulation pump 11 is supplied from the circulation pipe 8 provided with the flow sensor 9 and the temperature sensor 10 to the filtration tank 14 through the backwash pipe 27, the three-way valve 23, and the circulation pipe 22a. Flow into.
[0019]
The bathtub water 2 flowing into the filtration tank 14 from the circulation pipe 22a adheres to the filter medium 20 in the filtration tank 14 and accumulates dust, dirt, aluminum agglomerates, etc., along the circulation pipe 15b, the three-way valve 16, and the backwash pipe 26. The water is drained from the drainage port 25.
[0020]
The backwashing is performed at a flow rate (about 10 to 20 l / min) and the number of times (several times a day) that can remove dirt accumulated in the circulation system including the filter medium 20 and aluminum aggregates. .
[0021]
Hereinafter, a conventional circulating warm bath that operates as described above will be described with reference to FIG.
[0022]
FIG. 12 is a flowchart showing the operation of the conventional circulating bath.
When the circulation of the bathtub water 2 is started (S1), the bathtub water 2 is circulated between the bathtub 1 and the circulation warm bath body 7 in the normal circulation (S2), and the purification of the bathtub water 2 by aluminum electrolysis is performed. Next, when the sterilization of the circulating water bath is started (S3) and the sterilization of the circulating water bath is started, the three-way valve 23 is switched in the c → b direction by the control unit 30 and the circulation pump 11 is stopped. Then, the circulation of the bathtub water 2 is stopped (S4), the filtration tank heating (S5) is started, and the sterilization process in the filtration tank 14 is performed. Here, the sterilization (S3) of the circulating bath is operated by switching several times a day while interrupting the normal circulation (S2). In addition, when cleaning the electrode, it has been interrupted to operate by washing with citric acid or the like, or to perform manual cleaning.
[0023]
After the sterilization treatment by the filtration tank heating (S5), the control unit 30 starts the heat sterilization circulation (S6), and Legionella in the filtration tank 14 and the circulation pipes 8, 13, 15a, 15b, 22a, 22b, 28. Then, heat sterilization of Escherichia coli, Pseudomonas aeruginosa, etc. is performed. After completion of the heat sterilization process in the heat sterilization circulation (S6), backwashing (S7) is started by the control unit 30, and dust and dirt accumulated in the circulation system of the bath water 2 including the inside of the filtration tank 14 and aluminum aggregation Dirt such as objects is discharged from the discharge port 25, and the sterilization of the circulating bath is completed (S8).
[0024]
[Problems to be solved by the invention]
However, the conventional circulating bath has the following problems.
[0025]
Usually, when electrolysis is performed, the anode is on the acidic side and the cathode is on the alkaline side, but when neutral bath water is circulated, the pH in the vicinity of both electrodes immediately returns to neutral. Accordingly, when aluminum electrolysis of bathtub water is performed by circulating substantially neutral bathtub water in the filtration tank and passing a current between the aluminum electrode of the anode and the SUS electrode of the cathode, the surface of the aluminum electrode is always substantially omitted. Since neutral bath water flows, the vicinity of the aluminum electrode becomes neutral, and aluminum ions eluted from the aluminum electrode become aluminum hydroxide and immediately precipitate.
[0026]
For this reason, the bathtub water is circulated between a filtration tank having an aluminum electrode and a SUS electrode and the bathtub, and an aluminum electrode in the filtration tank is used as an anode and a current is passed between both electrodes using the SUS electrode as a cathode. If electrolysis is performed and aluminum hydroxide is eluted in the bath water over a long period of time, the deposited aluminum hydroxide scale adheres to the surface of the aluminum electrode, causing a decrease in the electrolysis current and the water in the bath water. The problem is that it is difficult to maintain stable purification including turbidity of bath water over a long period of time because the concentration of aluminum oxide is reduced, the cohesive power of suspended substances is reduced, and purification performance is reduced. Had. In addition, since the purification performance is reduced by the scale of aluminum hydroxide or the like attached to the aluminum electrode, the inside of the filter tank is filled with acid such as citric acid, acetic acid or malic acid every predetermined period (about once every 1 or 2 months). It is necessary to remove the scale attached to the aluminum electrode by cleaning, or to take out the aluminum electrode and physically remove it with a brush, etc. Was.
[0027]
In addition, the metal member constituting the circulating bath is corroded by washing the aluminum electrode with an acid (pH 2 to 5) such as citric acid, acetic acid, malic acid, etc. in the removal work of the scale attached to the aluminum electrode, and the durability of the circulating bath It had the problem of lacking in nature.
[0028]
The present invention solves the above-mentioned conventional problems, and provides a circulating hot water bath that is excellent in maintainability, can maintain stable purification performance over a long period of time, and can improve the durability of the circulating hot water bath, Another object of the present invention is to provide an electrode cleaning method capable of preventing the scale of aluminum hydroxide or the like from adhering to the aluminum electrode or cleaning the aluminum electrode by detecting the adhered scale.
[0029]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the circulating hot water bath in the present invention is a circulating hot water bath that circulates bathtub water in a filtration tank having an aluminum electrode and purifies the bathtub water by aluminum electrolysis. A control unit for cleaning the aluminum electrode by stopping the water circulation and performing aluminum electrolysis can maintain a stable purification performance over a long period of time. Maintenance can be improved, corrosion of the metal member constituting the circulating bath can be prevented, and durability of the circulating bath can be improved.
[0030]
An electrode cleaning method for a circulating warm bath according to the present invention is an electrode cleaning method for a circulating warm bath that circulates bathtub water in a filtration tank having an aluminum electrode and purifies the bathtub water by aluminum electrolysis. It is equipped with an electrode cleaning step that stops the circulation of the bath water in the interior and cleans the aluminum electrode by aluminum electrolysis, and prevents the aluminum electrode and the like from adhering to the aluminum electrode. The attached scale can be washed.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
The circulating warm bath according to claim 1 is a circulating warm bath that circulates bathtub water in a filtration tank having an aluminum electrode and purifies the bathtub water by aluminum electrolysis, and stops circulation of the bathtub water. A control unit for cleaning the aluminum electrode by performing aluminum electrolysis is provided, and the scale of aluminum hydroxide or the like adheres to the surface of the aluminum electrode by stopping the circulation of bath water and performing aluminum electrolysis. In addition to being able to prevent, scales such as aluminum hydroxide adhering to the surface of the aluminum electrode can be washed, and the purification performance of the bath water can be maintained over a long period of time.
[0032]
According to a second aspect of the present invention, in the circulating hot water bath according to the first aspect, the control unit detects a rise in the electrolytic voltage of the filter tank heating means and / or the aluminum electrode for heating the filter tank. Equipped with voltage detection means, heating the filtration tank by the filtration tank heating means can increase the solubility of scales such as aluminum hydroxide adhering to the surface of the aluminum electrode, the scale of aluminum hydroxide etc. on the surface of the aluminum electrode It is possible to prevent the adhesion of aluminum and to easily clean scales such as aluminum hydroxide adhering to the surface of the aluminum electrode. In addition, the voltage detecting means detects an increase in the electrolytic voltage of the aluminum electrode, and has an effect that the scale such as aluminum hydroxide adhered to the surface of the aluminum electrode can be cleaned.
[0033]
According to a third aspect of the present invention, there is provided a pre-filter in which the three-way valve provided on the downstream side of the filtration tank is switched and the upstream side of the circulation pump is switched. The upstream side of the filtration tank and the downstream side of the filtration tank are connected to each other, and are arranged upstream of the circulation pump when the three-way valve is switched and the circulation system of the closed circuit is used for heat sterilization circulation. It also has the effect of being able to sterilize by heating such as a prefilter.
[0034]
The electrode cleaning method according to claim 4 is an electrode cleaning method for a circulating warm bath that circulates bathtub water in a filtration tank having an aluminum electrode and purifies the bathtub water by aluminum electrolysis. An electrode cleaning step for stopping the circulation of the bathtub water and cleaning the aluminum electrode by aluminum electrolysis, and the pH of the bath water in the vicinity of the surface of the aluminum electrode can be lowered to 2-5, to the surface of the aluminum electrode It is possible to prevent the scale such as aluminum hydroxide from adhering to the surface and to clean the scale such as aluminum hydroxide adhered to the surface of the aluminum electrode.
[0035]
According to a fifth aspect of the present invention, there is provided the electrode cleaning method according to the fourth aspect, wherein the electrode cleaning step is performed while heating the filtration tank with a heater, and the aluminum hydroxide adhered to the surface of the aluminum electrode It is possible to increase the solubility of the scale such as aluminum hydroxide, to prevent the scale such as aluminum hydroxide from adhering to the aluminum electrode, and to dissolve and wash the scale such as aluminum hydroxide adhered to the surface of the aluminum electrode.
[0036]
The electrode cleaning method according to claim 6 is the invention according to claim 4, wherein after the electrode cleaning step stops the aluminum electrolysis, the filtration tank is heated to a predetermined temperature and then subjected to aluminum electrolysis. It is possible to increase the solubility of scales such as aluminum hydroxide adhering to the surface of the aluminum electrode, while preventing the adhesion of scales such as aluminum hydroxide to the aluminum electrode, and aluminum hydroxide adhering to the surface of the aluminum electrode It has an effect that it can be dissolved and washed.
[0037]
The electrode cleaning method according to claim 7 is performed in the invention according to any one of claims 4 to 6 after the electrode cleaning step detects an increase in electrolytic voltage of the aluminum electrode. In addition, it has an effect that it is possible to prevent adhesion of a scale such as aluminum hydroxide to the aluminum electrode over a long period of time.
[0038]
(Embodiment)
Hereinafter, the circulating bath in the embodiment of the present invention will be described with reference to the drawings.
[0039]
FIG. 1 is a system schematic diagram of a circulating warm bath in the embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the thing similar to FIG. 7, and description is abbreviate | omitted.
[0040]
In the figure, 24 'is a three-way valve disposed at a connection point connecting the circulation pipe 22b on the downstream side of the filtration tank 14, the circulation pipe 28' on the upstream side of the prefilter 6 and the jet nozzle 21, and 30 'is the filtration tank. It is a control part which controls a heating means and a voltage detection means.
[0041]
The filter medium 20 made of glass beads, ceramic balls, sand such as alumina in the filtration tank 14 has a particle size of about 0.3 mm to 1 mm. This is because the agglomerates produced by aluminum electrolysis having a size of about 30 μm to 40 μm can be filtered.
[0042]
Hereinafter, the operation of the circulating warm bath configured as described above will be described with reference to the drawings.
[0043]
FIG. 2 is a diagram showing the flow of bath water during normal circulation of the circulating hot water bath, FIG. 3 is a diagram showing sterilization of the circulating hot water bath filter tank and electrode cleaning, and FIG. 4 is a diagram of the circulating hot water bath. It is the figure which showed the flow of the bathtub water at the time of heat sterilization circulation, and FIG. 5 is the figure which showed the flow of the bathtub water at the time of backwashing of a circulating warm bath.
[0044]
As shown in FIG. 2, the normal circulation of the circulating warm bath in the embodiment is the same as that of the conventional circulating warm bath (FIG. 8), and when the normal circulation is started by the control unit 30 ′, The three-way valve 16 is switched to the a → c direction and the three-way valves 23 and 24 ′ are switched to the c → a direction, and the bathtub water 2 is discharged from the jet nozzle 21 to the bathtub 1 through the circulation pump 11, the sterilizer 12, and the filtration tank 14. And is circulated between the bathtub 1 and the circulating bath body 7.
[0045]
In the sterilization of the circulating hot water bath and the electrode cleaning in the embodiment, the three-way valve 23 is switched in the c → b direction by the control unit 30 ′, and the circulation pump 11 is stopped. As shown in FIG. Circulation stops.
[0046]
Next, the bath water in the filtration tank 14 is heated by the heater 17 of the filtration tank 14 (the filtration tank heating means of the present embodiment) while the circulation of the bathtub water 2 is stopped, as in the conventional heating of the filtration tank (FIG. 9). 2 is heated to a temperature of 70 ° C. to 85 ° C. to sterilize Legionella spp., Pseudomonas aeruginosa and the like in the filtration tank 14.
[0047]
Next, similarly to the aluminum electrolysis performed in the filtration tank 14 during normal circulation, the aluminum electrode 18 is used as an anode, the SUS electrode 19 is used as a cathode, and current is passed between the two electrodes 18, 19 to perform aluminum electrolysis. The aluminum electrode 18 is cleaned by lowering the pH of the bathtub water 2 near the surface to 2-5.
[0048]
As shown in FIG. 4, the heat sterilization circulation in the embodiment is the same as that during the heat sterilization circulation of the conventional circulation bath (FIG. 10). The valve 23 is switched from c to a and the three-way valve 24 'is switched from c to b, and the circulation pump 11 is operated to form a closed circuit circulation system as shown in FIG. The bath water 2 in the filtration tank 14 heated up to 3 is returned to the filtration tank 14 through the pre-filter 6, the circulation pump 11 and the sterilizer 12 through the three-way valves 23 and 24 ', and circulated in the closed circuit circulation system. Then, Legionella spp., Escherichia coli, Pseudomonas aeruginosa and the like in the filtration tank 14 and the circulation pipes 8, 13, 15a, 15b, 22a, 22b, 28 'are sterilized by heating.
[0049]
As shown in FIG. 5, the backwashing in the embodiment is the same as the backwashing of the conventional circulating bath (FIG. 11). When the backwashing is started by the control unit 30 ', the three-way valve 23 is turned on. In the b → c direction, the three-way valve 16 is switched from c → b, and the bathtub water 2 supplied from the water supply port 4 is filtered from the circulation pipe 8 through the backwash pipe 27, the three-way valve 23, and the circulation pipe 22a. It is drained from the drain port 25 through the circulation pipe 15b, the three-way valve 16, and the backwash pipe 26 together with dust, dirt, aluminum aggregates, and the like that have flowed into the filter tank 14 and adhered to the filter medium 20 in the filter tank 14.
[0050]
Hereinafter, the operation of the circulating bath in the embodiment operating as described above will be described with reference to FIG.
[0051]
FIG. 6 is a flowchart showing the operation of the circulating warm bath in the embodiment.
When the circulation of the bathtub water 2 is started (S10), the bathtub water 2 is circulated between the bathtub 1 and the circulation warm bath body 7 by the normal circulation (S11), and the purification of the bathtub water 2 by aluminum electrolysis is performed.
[0052]
Next, when the sterilization and electrode cleaning of the circulating hot water bath filtration tank 14 are started by determining whether the circulating hot water bath is sterilized and electrode cleaning is started (S12), the three-way valve 23 is turned on by the electrode cleaning step of the control unit 30 '. While being switched to the b direction, the circulation pump 11 stops and the circulation of the bath water 2 in the filtration tank 14 stops (S13). Next, it is determined whether or not the filtration tank 14 is heated (S14). When the filtration tank 14 is heated, the control section 30 'starts heating the filtration tank 14 (S15). The filtration tank 14 is heated to a temperature of 70 to 85 ° C. at which Legionella spp., Pseudomonas aeruginosa, etc. can be sterilized and then sterilized, and then the aluminum electrode 18 is washed while the circulation of the bath water 2 is stopped ( S16) is performed. The filtration tank 14 may be heated during the aluminum electrode cleaning, or after the aluminum electrolysis is stopped, the filtration tank 14 is heated, heated to a predetermined temperature, and then subjected to aluminum electrolysis to clean the aluminum electrode. Also good. Here, the electrode cleaning step comprising the bath water circulation stop (S13), the filtration tank heating determination (S14), the filtration tank heating (S15), and the aluminum electrode cleaning (S16) is interrupted during the normal circulation (S11). Thus, the number of times of sterilization (for example, once every 4 hours, 6 times a day) or the voltage control means of the control unit 30 'can suppress the growth of bacteria in the circulating bath filter 14 and the bath water 2. This is performed after detecting the increase in the electrolysis voltage of the aluminum electrode 18.
[0053]
After electrode cleaning by the aluminum electrode cleaning (S16) of the electrode cleaning step, the heat sterilization circulation (S17) is started by the control unit 30 ', and the inside of the filtration tank 14 and the circulation pipes 8, 13, 15a, 15b, 22a, 22b, 28 are started. The heat sterilization of Legionella spp., Escherichia coli, Pseudomonas aeruginosa, etc. in the ′ is performed. After completion of the heat sterilization process in the heat sterilization circulation (S17), backwashing (S18) is started by the control unit 30 ', and dust and dirt accumulated in the circulation system of the bathtub water 2 including the inside of the filtration tank 14 and aluminum Dirt such as agglomerates is discharged from the discharge port 25, and the sterilization and electrode cleaning of the circulating bath are completed (S19).
[0054]
As described above, according to the present embodiment, in the electrode cleaning step during the sterilization and electrode cleaning of the circulating warm bath filter tank that is interrupted during the normal circulation, the bath water circulation is stopped and the aluminum is stopped during the circulation stop. By performing electrolysis, the pH of the bath water near the surface of the aluminum electrode that approaches neutrality when circulating can be lowered to 2-5, and the state of aluminum on the surface of the aluminum electrode can be changed to trivalent aluminum ions. And has the effect of preventing aluminum hydroxide from adhering to the surface of the aluminum electrode. Moreover, it has the effect | action which melt | dissolves and wash | cleans scales, such as aluminum hydroxide adhering to the surface of the aluminum electrode.
[0055]
In addition, by heating the bath water in the filtration tank during the cleaning of the aluminum electrode, the solubility of the scale such as aluminum hydroxide attached to the aluminum electrode can be further increased, and the scale such as aluminum hydroxide on the surface of the aluminum electrode can be increased. It has an effect that scales such as aluminum hydroxide can be easily washed.
[0056]
Further, since the three-way valve is disposed at a connection point connecting the downstream side of the filtration tank, the upstream side of the prefilter, and the jet nozzle, it has an effect that the prefilter can be sterilized during the heat sterilization circulation.
[0057]
In addition, the effect | action and effect of this invention are acquired also in the case of the apparatus which removes the ss component of the waste_water | drain and the soot which has the structure and washing | cleaning method similar to the filtration tank in this Embodiment.
[0058]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
[0059]
According to the first aspect of the invention, by stopping the circulation of the bath water and performing aluminum electrolysis, it is possible to prevent adhesion of scale such as aluminum hydroxide to the surface of the aluminum electrode, and to the surface of the aluminum electrode. The scale of adhered aluminum hydroxide can be cleaned, and the aluminum electrode is periodically cleaned with acids (pH 2 to 5) such as citric acid, acetic acid and malic acid as in the past, or the aluminum electrode is taken out and brushed. Therefore, it is not necessary to physically remove the scale and the like, the running cost can be reduced, the maintainability is excellent, the corrosion of the metal member of the circulating bath is prevented, and the durability of the circulating bath is improved.
[0060]
According to invention of Claim 2, in addition to the effect of Claim 1, the solubility of scales, such as aluminum hydroxide which heated the filtration tank by the filtration tank heating means and adhered to the surface of an aluminum electrode, can be raised, Prevents the adhesion of aluminum hydroxide and other scales to the surface of the aluminum electrode and facilitates cleaning of the aluminum hydroxide and other scales attached to the surface of the aluminum electrode, and stabilizes the purification performance of the circulating bath for a long period of time. In addition, it is possible to perform efficient aluminum electrolysis and improve the purification performance (coagulation effect) of the bath water.
[0061]
In addition, the voltage detection means detects the increase in the electrolysis voltage of the aluminum electrode and can clean the scale such as aluminum hydroxide adhering to the surface of the aluminum electrode. The electrode can be cleaned and is easy to maintain.
[0062]
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, when performing the heat sterilization circulation of the circulating warm bath using the three-way valve as a closed circuit circulation system, the upstream side of the circulation pump is provided. Heat disinfection of the prefilter and the like can be performed, and the hygiene of the circulating bath is excellent.
[0063]
According to the invention of claim 4, the pH of the bath water near the surface of the aluminum electrode can be lowered to 2 to 5, and the adhesion of scale such as aluminum hydroxide to the surface of the aluminum electrode can be prevented. In addition, the scale of aluminum hydroxide or the like attached to the surface of the aluminum electrode can be cleaned, and the cleaning performance of the aluminum electrode is excellent, and the performance of the aluminum electrode can be maintained.
[0064]
According to the fifth aspect of the invention, in addition to the effect of the fourth aspect, the solubility of the scale such as aluminum hydroxide attached to the surface of the aluminum electrode can be increased, and the scale of the aluminum hydroxide or the like on the aluminum electrode can be increased. In addition to preventing adhesion, scales such as aluminum hydroxide adhered to the surface of the aluminum electrode can be dissolved and washed, and the aluminum electrode and the circulating warm bath can be easily purified in a short period of time, resulting in excellent maintainability.
[0065]
According to the sixth aspect of the invention, in addition to the effect of the fourth aspect, the solubility of the scale such as aluminum hydroxide adhered to the surface of the aluminum electrode can be increased, and the scale of the aluminum hydroxide or the like on the aluminum electrode can be increased. Adhesion can be prevented and scales such as aluminum hydroxide adhering to the surface of the aluminum electrode can be dissolved and washed.
[0066]
According to the seventh aspect of the invention, in addition to the effects of the fourth to sixth aspects, it is possible to prevent adhesion of scale such as aluminum hydroxide to the aluminum electrode, and to prevent a decrease in electrolytic current over a long period of time. Therefore, it is not necessary to apply a useless electrolysis voltage, and a stable purification performance can be obtained for a long period of time, an efficient aluminum electrolysis can be performed, and the purification performance (coagulation effect) can be improved.
[Brief description of the drawings]
FIG. 1 is a system schematic diagram of a circulating warm bath in an embodiment of the present invention.
FIG. 2 is a diagram showing the flow of bathtub water during normal circulation of a circulating bath
FIG. 3 is a diagram showing sterilization and electrode cleaning of a circulating bath filter tank
FIG. 4 is a diagram showing the flow of bathtub water during the heat sterilization circulation of the circulating bath
FIG. 5 shows the flow of bathtub water during backwashing of a circulating bath
FIG. 6 is a flowchart showing the operation of the circulating warm bath in the embodiment.
FIG. 7 is a schematic diagram of a conventional circulating bath system.
FIG. 8 is a diagram showing the flow of bathtub water during normal circulation of a circulating water bath
FIG. 9 is a diagram showing the sterilization of the circulating bath filter tank
FIG. 10 is a diagram showing the flow of bathtub water during the heat sterilization circulation of the circulating bath
FIG. 11 shows the flow of bathtub water during backwashing of a circulating bath
FIG. 12 is a flowchart showing the operation of the conventional circulating bath.
[Explanation of symbols]
1 Bathtub
2 Bath water
3 Nozzle unit
4 water inlet
5 Check valve
6 Pre-filter (hair catcher)
7 Circulating water bath body
8 Circulation pipe
9 Flow sensor
10, 17a Temperature sensor
11 Circulation pump
12 Sterilizer
13 Circulation pipe
15a, 15b Circulation pipe
14 Filtration tank
16, 23, 24, 24 'three-way valve
17 Heater
18 Aluminum electrode
19 SUS electrode
20 Filter media
21 Jet nozzle
22a, 22b, 22c Circulation pipe
25 Backwash drain
26, 27 Backwash pipe
28,28 'Circulation pipe
29 Power supply
30, 30 'controller
31 Display and operation unit

Claims (7)

A circulating hot water bath for circulating bath water through a filtration tank having an aluminum electrode and purifying the bath water by aluminum electrolysis, wherein the aluminum electrode is washed by stopping the bath water circulation and washing the aluminum electrode A circulating water bath comprising a control unit for performing 2. The circulating hot bath according to claim 1, wherein the control unit includes a filtration tank heating means for heating the filtration tank and / or a voltage detection means for detecting an increase in the electrolytic voltage of the aluminum electrode. vessel. The three-way valve provided on the downstream side of the filtration tank is switched, and the upstream side such as a prefilter disposed on the upstream side of the circulation pump and the downstream side of the filtration are connected to each other. 2. The circulating hot water bath according to 2. An electrode cleaning method for a circulating bath that circulates bathtub water in a filtration tank having an aluminum electrode and purifies the bathtub water by aluminum electrolysis, wherein the circulation of the bathtub water in the filtration tank is stopped by aluminum electrolysis. An electrode cleaning method for a circulating warm bath characterized by comprising an electrode cleaning step for cleaning an aluminum electrode. The electrode cleaning method for a circulating warm bath according to claim 4, wherein the electrode cleaning step is performed while heating the filtration tank with a heater. 5. The electrode cleaning method for a circulating water bath according to claim 4, wherein in the electrode cleaning step, after the aluminum electrolysis is stopped, the filtration tank is heated and heated to a predetermined temperature and then subjected to aluminum electrolysis. The method for cleaning an electrode of a circulating water bath according to any one of claims 4 to 6, wherein the electrode cleaning step is performed after detecting an increase in electrolytic voltage of the aluminum electrode.

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