JPH11156364A - Circulating hot bath device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent metals of metal members of a filtration tub from eluting into bath water, and to provide a circulating hot bath device having a long life. SOLUTION: This circulating hot bath device is provided with a circulating pump 11 which sucks bath water from a bathtub and circulates the water through circulation water passages 9, 13, 17, 23, 25, and 26, a heater 19 for heating the water which circulates through the circulation water passages and retaining the temperature, a filtration tub 8 where electrodes for electrocoagulation are installed inside and coagulated suspension components are filtered to purify the bath water circulating through the circulation water passages, and a power supply part feeding power to the electrodes for electrocagulation, wherein a positive electrode of the above electrodes for electrocoagulation is electrified to an electric potential more than a dissolved potential, and metal members except the positive electrode installed in the filtration tub 18 are electrified to an electric potential below the dissolved potential of each metals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating warm water bath for heating and keeping warm while circulating bath water and filtering the bath water.

[0002]

2. Description of the Related Art In recent years, circulating baths have become widespread in pursuit of comfort and convenience of life. This conventional circulating warm water bath draws and circulates bath water from a bath tub, filters and cleans the bath water in a filter bath, and heats the bath water with a heating and heating heater.
They are kept warm and returned to the bathtub, and most of them can be taken at any time for 24 hours.

[0003] In this conventional circulating warm bath, a biological filter tank containing a large number of filter media on which purifying bacteria are fixed has been often used as a filter tank. However, it is difficult to control bacteria that purify suspended components consisting of dirt (organic substances, proteins, lipids, and other organic substances) and fine dust in the bath water. There was a problem that it occurred.

[0004] Therefore, a method has been proposed in which fine suspended components are subjected to coagulation filtration and then sterilized by a sterilizer to purify, instead of simply filtering with a purifying bacterium. In this conventional circulating warm bath, suspended components are electrolytically coagulated by aluminum ions eluted by electrolyzing aluminum and filtered. The conventional circulating warm bath of the aluminum electrolysis type will be described in detail. FIG. 2 is a system schematic diagram of a conventional circulating warm water bath. In FIG. 2, 1 is a bathtub, 2 is bath water, 3 is a nozzle unit, 4 is a suction port, 6 is a check valve for preventing backflow of bath water, and 7 is a pre-filter. As the pre-filter 7, a sponge, a mesh made of resin such as polypropylene, a thread-wound filter, or the like is used. Next, 9,
13, 17, 23, 25, 26 and 32 are circulating waterways, 10
Is a flow rate sensor, 35 and 36 are temperature sensors, 11 is a circulation pump, 12 is a sterilizer, 16, 24, and 37 are three-way valves, 18 is a filtration tank, 19 is a heater for heating and keeping heat, 20 is an aluminum electrode, and 21 is SUS. The electrode 22 is a filter medium. The aluminum electrode 20 and the SUS electrode 21 constitute an electrode for electrolytic aggregation. The filter medium 22 is made of glass beads, ceramic balls, alumina or the like. 28 is a discharge port for returning bath water to the bathtub 1; 29 is a circulating warm water bath main body; 30 is a power supply unit; 31 is a controller;
Reference numerals 4, 15, and 33 denote backwash water channels, 34 denotes a backwash drain, and 38 denotes an operation display unit.

Hereinafter, the operation of the circulating warm bath will be described. There are three operation modes of the circulating warm bath: (1) normal operation mode, (2) sterilization mode, and (3) backwash mode. First, the normal operation mode (1) will be described.
When the circulation pump 11 is driven by a command from the controller 31, the bath water 2 is sucked up from the suction port 4 and enters the circulation pump 11 through the pre-filter 7, the flow sensor 10 and the temperature sensor 36. At this time, large trash such as hair contained in the bath water is collected by the pre-filter 7 provided in the middle of the circulation channel 9.

The bath water 2 sent out from the circulation pump 11
Is sterilized by a sterilizer 12 using ultraviolet light, ozone, or the like. After sterilization, the bath water 2 changes the three-way valve 16 from 1a to c.
And is led to the filtration tank 18. In the filtration tank 18, power is supplied from the power supply unit 30 so that the aluminum electrode 20 serves as an anode and the SUS electrode 21 serves as a cathode, and aluminum electrolysis is performed. That is, when a current flows between the aluminum electrode 20 and the SUS electrode 21, aluminum ions are eluted from the aluminum electrode 20 into the bath water in the filtration tank 18, which is precipitated as aluminum hydroxide in the bath water and suspended in the water. It aggregates the components. The flocculated suspended component is aggregated into the filter medium 22.
And filtered. The bath water 2 that has been filtered and becomes clean bath water flows through the three-way valves 24 and 37 in the direction of c → a, and is returned from the discharge port 28 into the bath tub 1. At the same time, in the filtration tank 18, the controller 31 controls energization of the heater 19 for heating and maintaining the temperature based on the temperatures detected by the temperature sensors 35 and 36 to heat and maintain the temperature of the bath water. Kept at temperature.

Next, in the (2) sterilization mode, the three-way valve 16 remains at a → c, but the three-way valve 24 is switched from c → b. As a result, a closed circuit is formed by the sterilizer 12 and the filtration tank 18. When this switching is completed, the controller 31 supplies power to the heater 19 for heating and keeping heat, and
The inside is heated to 70 ° C. or more. When the heating is completed, the controller 31 switches the three-way valve 24 from c to a and switches the three-way valve 37 from c to b. The hot water in the filtration tank 18 circulates in a closed circuit including the circulation pump 11, the sterilizing device 12, and the filtration tank 18 to heat sterilize bacteria. After the heat sterilization, the three-way valve 37 is switched from c to a to radiate heat, and the hot water settled at about 40 ° C. is returned to the bathtub 1 and the mode is ended.

(3) In the backwash mode, the three-way valve 16 is switched from c → b, the three-way valve 24 is switched from b → c, and the three-way valve 37 is switched from c → a. In this state, when the circulation a pump 11 is operated, the circulation pump 11 sucks the bath water 2 from the bathtub 1,
The bath water 2 is led to the filtration tank 18 via the three-way valve 24. By this introduction, the filter medium 22 in the filter tank 18 is backwashed, and the suspended components remaining in the filter tank 18 are discharged from the backwash water outlet 34 through the backwash water channel 15.

As can be seen from the above description, a conventional circulating warm water bath of the aluminum electrolysis type is easier to control than the biological filtration type, and has a strong sterilizing power and is suitable for a bath which can take a bath 24 hours any time. It was a very suitable circulating warm bath.

[0010]

In this conventional circulating warm bath, the aluminum electrode 20 in the filtration tank 18 is used as an anode,
It is necessary to supply a current from the power supply unit 30 so that the US electrode 21 becomes a cathode. However, since the bath water 2 in the filtration tank 18 contains an electrolytic substance, the surface of metal parts such as the heater 19 and the temperature sensor 35 provided in the filtration tank 18 has a positive value in inverse proportion to the distance from the cathode. There is a problem in that a potential is generated, a current flows between the cathode and the metal, and the metal constituting the metal part is eluted into the bath water 2 and the life of the part is extremely shortened.

Accordingly, the present invention is to solve such a conventional problem, and an object of the present invention is to provide a circulating warm water bath having a long life by suppressing the metal of a metal portion in a filtration tank from being eluted into bath water. I do.

[0012]

In order to solve this problem, a circulating warm bath according to the present invention is characterized in that the anode among the electrodes for electrolytic coagulation is applied to a potential higher than the dissolution potential, and the anode provided in a filtration tank is provided. Other metal parts are applied to a potential lower than the melting potential of the metal.

As a result, the metal in the metal portion in the filtration tank is prevented from being eluted into the bath water, and the life can be extended.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is a circulating pump for sucking bath water from a bath tub and circulating the circulating water passage, and for heating and keeping the bath water circulating in the circulating water passage. A heating and warming heater, a filtration tank in which an electrode for electrolytic flocculation is provided and a filter tank for purifying bath water circulating through the circulation channel by filtering the flocculated components, and a power supply unit for supplying power to the electrode for electrolytic flocculation. A circulating warming bath provided, wherein an anode of the electrode for electrolytic flocculation is applied to a potential higher than the dissolution potential, and a metal part provided in the filtration tank other than the anode has a potential lower than the dissolution potential of the metal. Is applied to the bath, so that the metal constituting the metal part is prevented from being eluted into the bath water.

According to a second aspect of the present invention, the heating and heating heater is provided in the filtration tank, and the heater is provided in the metal tank.
Therefore, the metal constituting the heating and keeping heater can be suppressed from being eluted into the bath water.

According to a third aspect of the present invention, the temperature sensor for detecting the temperature of the bath water is provided in the filter tank and is one of the metal parts. Elution is suppressed.

According to the fourth aspect of the present invention, since the metal portion is grounded, the elution of the metal from the metal portion other than the anode into the bath water can be suppressed with a simple structure.

According to the fifth aspect of the present invention, since the metal portion has the same potential as the cathode of the electrode for electrolytic coagulation, elution of metal from the metal portion other than the anode into the bath water can be suppressed.

In the invention described in claim 6, since the metal portion is electrically short-circuited with the cathode of the electrode for electrolytic coagulation, the metal is eluted from the metal portion other than the anode into the bath water with a simple structure. Can be suppressed.

[0020] In the invention described in claim 7, the anode of the electrode for electrolytic flocculation is a cylindrical electrode, and the cathode of the electrode for electrolytic flocculation is a metal container constituting the filtration tank; Since the portion is disposed inside the anode, when the metal portion is set to the same potential as the cathode, electrolysis can be performed on both surfaces of the anode, thereby enabling effective use of the electrode and suppressing elution of the metal into the bath water.

FIG. 1 shows an embodiment of the present invention.
This will be described using (a) and (2). (Embodiment) FIG. 1 (a) is a schematic diagram of a circulating warm water bath system according to one embodiment of the present invention, and FIG. 1 (b) is a cross-sectional view of a filtration tank of the circulating warm water bath according to one embodiment of the present invention. It is. 1 (a) and 1 (2), 1 is a bathtub, 2
Is bath water, 3 is a nozzle unit, 4 is a suction port, 5 is a filter section, 6 is a check valve, 7 is a prefilter, 8 is activated carbon, 9, 13, 17, 23, 25, 26, and 32 are circulation channels. 10 is a flow sensor, 35 and 36 are temperature sensors, 11 is a circulation pump, 12 is a sterilizer, 16, 24,
37 is a three-way valve, 18 is a filtration tank, 19 is a heater for heating and keeping heat, 20 is an aluminum electrode, 21 is a SUS electrode, 22 is a filter medium, 28 is a discharge port, 29 is a circulating warm bath main body, 30 is a power supply unit, and 31 is a power supply unit. Controller, 32 is a heat sterilization circulation channel, 1
Reference numerals 4, 15, and 33 denote backwash water channels, 34 denotes a backwash drain, and 38 denotes an operation display unit. Reference numeral 39 denotes a short-circuit line for electrically short-circuiting a metal part other than the aluminum electrode 20 such as the temperature sensor 35 and the heater 19 for heat insulation and the SUS electrode 21. In the above description, members having the same reference numerals as those described for the conventional circulating warm water bath shown in FIG. 2 have basically the same functions, and the description thereof will be transferred to the description of the conventional circulating warm water bath. Then we omit it.

Similar to the conventional circulating warm bath, the aluminum electrode 20
And the SUS electrode 21 are provided to face each other and constitute a pair of electrodes for electrolytic aggregation. The positive electrode applied to the positive electrode of the pair of electrodes for electrolytic coagulation is the aluminum electrode 2
0, and the shape is cylindrical. This cylindrical electrode is inserted inside the filtration tank 18 so as to be parallel along the tank wall. The aluminum electrode 20 is controlled by the controller 31 so as to have a potential higher than the dissolution potential of aluminum (about 1.68 V for normal bath water). The reason is that aluminum ions eluted from the aluminum electrode 20 by electrolysis become aluminum hydroxide at around pH 7 and precipitate out of the bath water to aggregate suspended components contained in the bath water. The suspended components after aggregation are filtered by the filter medium 22, and the bath water is purified in the filtration tank 18. Next, the SUS electrode 21 serving as a cathode is a metal container that constitutes an inner container of the filtration tank 18, and also serves as a part of the container in addition to the function as an electrode. Since the metal constituting the electrode does not elute into the bath water at the cathode, there is no need to consider the dissolution potential as in the anode.

By the way, in the filtration tank 18 of the circulating warm bath, other metal parts are often present in addition to the electrode for electrolytic coagulation. In the present embodiment, the temperature sensor 35 and the heater 19 are provided so as to protrude from the upper wall toward the inside of the aluminum electrode 20. This temperature sensor 35
Each of the heater 19 and the heater 19 has a metal portion. For example, the heating and keeping heater 19 is configured to generate heat by energizing a heating wire which is a metal wire, and has a structure in which a metal surface is brought into contact with liquid to heat it. Contains. Also,
In addition to the temperature sensor 35 and the heater 19,
A case where a level detecting electrode for detecting a water level is provided in the filtration tank 18 so as to prevent the accumulation of air also corresponds to such a case. This level detecting electrode also has a metal part as a matter of course. When a flow sensor or the like is provided, the metal part of the flow sensor becomes another metal part.

Now, since the bath water in the filtration tank 18 contains an electrolytic substance, when a potential is applied to both electrodes, the surface of these metal parts is positively in inverse proportion to the distance from the SUS electrode 21 which is a cathode. And a current flows between the cathode and the cathode. Then, there is a possibility that the metal of these metal parts exceeds the melting potential. Therefore, by forcibly setting the potential of these metal parts to 0 V or minus,
No metal parts will elute into the bath water. In the present embodiment, of the aluminum electrode 20 and the SUS electrode 21 that are the electrodes for electrolytic aggregation, the metal part other than the aluminum electrode 20 that is the anode and the SUS electrode 21 are electrically short-circuited by the short-circuit wire 39. I have. That is, the heater 19 and the temperature sensor 35 are connected to the
Connected to US electrode 21. Due to the short-circuit line 39, the surface potential of the metal portion provided in the filtration tank 18 becomes the same potential as the SUS electrode 21 and does not become a positive potential unlike the conventional circulating hot water bath. No metal ions are eluted from the 35 metal surface. Note that instead of the short-circuit line 39, S
Heating / heating heater 19 and temperature sensor 35 on US electrode 21
When fixing, it is also possible to make a short circuit by making direct contact.

In the above description, the short-circuit line 39 is for short-circuiting the metal portion and the cathode to have the same negative potential. However, even if the metal portion is grounded and forced to 0 V as described above, a positive potential is obtained. Therefore, the elution of metal ions can be similarly suppressed. Although the grounding has a very simple configuration, the elution of metal ions can be suppressed.

In the circulating warm water bath of the present embodiment, metal parts such as the temperature sensor 35 and the heater 19 are short-circuited by the short-circuit wire 39, and the cylindrical aluminum electrode protruding from the upper wall of the filtration tank 18 is formed. Since it is provided so as to be inserted into the inside of the aluminum electrode 20, current flows between the outer periphery of the aluminum electrode 20 and the SUS electrode 21, and also flows through the temperature sensor 35 and the heater 19 for heat insulation on the inner periphery. In addition, the electrode area of the aluminum electrode 20 can be effectively used, and the aggregation efficiency can be increased.

[0027]

As described above, the circulating warm water bath of the present invention can suppress the metal constituting the metal part other than the anode in the filtration tank from being eluted into the bath water, prolong the life, and improve the coagulation efficiency. Can be raised.

[Brief description of the drawings]

FIG. 1A is a schematic diagram of a circulating warm water bath system according to one embodiment of the present invention; FIG. 1B is a cross-sectional view of a filtration tank of the circulating warm water bath according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a conventional circulating warm water bath system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bathtub 2 Bath water 3 Nozzle unit 4 Suction port 5 Filter part 6 Check valve 7 Prefilter 8 Activated carbon 9, 13, 17, 17, 23, 25, 26, 32 Circulating water channel 10 Flow rate sensor 11 Circulating pump 12 Sterilizer 14, 15 , 33 Backwash water passage 16, 24, 37 Three-way valve 18 Filtration tank 19 Heating / heating heater 20 Aluminum electrode 21 SUS electrode 22 Filter medium 28 Discharge port 29 Circulating warm water bath body 30 Power supply unit 31 Controller 32 Heat sterilization circulation water passage 34 Backwash drainage Mouth 35, 36 Temperature sensor 38 Operation display section 39 Short-circuit wire

Claims (7)

[Claims] 1. A circulating pump for sucking bath water from a bath tub and circulating the circulating water passage, a heating and heating heater for heating and maintaining the bath water circulating in the circulating water passage, and an electrode for electrolytic coagulation provided inside. A filtration tank for purifying the bath water circulating in the circulation channel by filtering the aggregated suspended components, and a circulating warm bath provided with a power supply unit for supplying power to the electrode for electrolytic flocculation; A circulating warm bath wherein the anode is applied to a potential equal to or higher than the melting potential, and a metal portion provided in the filtration tank other than the anode is applied to a potential equal to or lower than the melting potential of the metal. 2. The circulating bath according to claim 1, wherein said heater is provided in said filter tank and is one of said metal parts. 3. The circulating bath according to claim 1, wherein a temperature sensor for detecting a temperature of the bath water is provided in the filtration tank and is one of the metal parts. 4. The circulating bath according to claim 1, wherein said metal portion is grounded. 5. The circulating warm bath according to claim 1, wherein said metal portion has the same potential as a cathode of said electrode for electrolytic coagulation. 6. The circulating bath according to claim 1, wherein said metal portion is electrically short-circuited with a cathode of said electrode for electrolytic coagulation. 7. An anode of said electrode for electrolytic flocculation is a cylindrical electrode, and a cathode of said electrode for electrolytic flocculation is a metal container constituting said filtration tank, and said metal portion is disposed inside said anode. The circulating warm water bath according to claim 6, which is provided.