JPH10196U - Circulating water heater for bath - Google Patents

Abstract

(57) [Summary] [Problem] To simplify maintenance and inspection of a primary filter. A circulating hot water device for a bath filters hot water filtered by a primary filter (A) with a granular filter (21).
In the primary filter, a cover is detachably attached to the case body 35 to incorporate a filter material. The case main body 35 includes the insertion tube 30 connected to the opening in the bathtub.
And the filter mounting part 3 for mounting the filter material 33
2, the filter mounting portion 32 is formed to be larger than the insertion tube 30 with the flange 31 connected to the insertion tube 30,
A filter material 33 larger than the inner shape of the insertion tube 30 is mounted on the filter mounting portion 32.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a circulating hot water device for a bath that circulates hot water in a bath tub to heat the bath to an appropriate temperature and remove dirt from the hot water.

[0002]

[Prior art]

 A circulating water heater for home baths, which is connected to a bathtub and circulates hot water for 24 hours, has been developed. In this circulating water heater, the temperature of the hot water is detected by a sensor, and the temperature of the hot water is constantly controlled to an appropriate temperature of 39 to 46 ° C. by a heater provided in the hot water channel. In addition, dirt and bacteria contained in the hot water are removed and clarified and circulated.

[0003] In this type of bath, there is no need to heat the water by replacing it with fresh water every day. For this reason, both water saving and energy saving characteristics can be satisfied simultaneously. In addition, there is a very convenient feature that you can take a bath anytime 24 hours a day. In this type of bath, the hot water is filtered continuously for 24 hours with a filter to keep it clear, so the filter is required to have the property of being able to filter hot water for a long time.

In a conventional circulating water heater, as shown in FIG. 5, a filter sheet 1 is disposed between a granular filter 2 made of natural stone, and the filter sheet 1 and the granular filter 2 remove dirt of hot water. I was In the circulating water heater of this structure, dirt and foreign matter contained in the hot water are removed by the filter sheet 1, so that dirt accumulates there. If the filter sheet 1 becomes dirty and clogged, the amount of hot water circulation decreases. A decrease in the circulation of hot water significantly reduces the filtration capacity of the granular filter. This is because the particulate filter keeps warm water clear in the following conditions:

That is, the particulate filter that circulates hot water does not physically remove foreign substances contained in the hot water by filtering. The granular filter has an effect of removing ultra-fine foreign matters contained in warm water and keeping the fines in spite of the fact that aggregates which are significantly larger than foreign matters to be filtered are collected. This is because the granular filter that aggregates the grains keeps warm water clear by the action of microorganisms.

[0006] If a granular filter is disposed in a circulation path of warm water heated to an appropriate temperature, a comfortable environment for the propagation of microorganisms is created, and aerobic microorganisms are parasitized. Microorganisms eat ammonia and proteins contained in hot water as food and decompose. Therefore, sweat and dirt in the warm water are effectively removed by the microorganism.

The method of clarifying warm water in this state does not merely filter foreign substances mechanically, so that a large granular filter that is incomparable with the foreign substances to be filtered is used to make it invisible. It can dissolve fine dirt and remove it neatly. Therefore, the hot water is kept in a state of extremely high transparency.

However, in order for the granular filter to efficiently clarify hot water, it is important to keep the activity of microorganisms active. For this purpose, it is necessary to supply sufficient oxygen to the aerobic microorganisms by increasing the circulation amount of hot water, and to supply sweat, dirt, etc., which feed on the microorganisms. When the circulation of hot water is reduced, the supply of oxygen and food is reduced, and the ability of microorganisms to clarify hot water is reduced.

This is clear from the fact that the particulate filter cannot clarify the warm water and becomes cloudy until the microorganisms propagate. When the circulating water heater is used for the first time, no microorganisms are growing on the particulate filter. In other words, when the circulating water heater is connected to the bath tub and the water is put into the bath tub and the circulating water heater is started, even if the hot water is circulated, almost no microorganisms propagate on the particulate filter.

[0010] As the circulating water heater is used, aerobic microorganisms attached to the particulate filter or contained in the warm water propagate on the particulate filter as a living space. Until microorganisms grow, granular filters have little effect on clarifying warm water. Therefore, the warm water is in a cloudy state during this time and cannot be clarified.

When used for a few days to a few weeks, microorganisms can propagate on the particulate filter and the warm water can be clarified. Thus, granular filters cannot clarify hot water without ignoring the action of microorganisms.

[0012] For this reason, it is extremely important for a device that always keeps bathtub water heated to an appropriate temperature clear to be able to work microorganisms actively. If the activity of the microorganisms can be actively maintained, the bath water is filtered to be extremely clear, but if the activity of the microorganisms is reduced, the warm water becomes cloudy and cannot be kept clean. Bath tub heated to an appropriate temperature is continuously circulated through a granular filter for 24 hours to keep it clarified with microorganisms. As long as microorganisms work actively, water is replaced every day without filtering bath tub water. Can also be kept pretty clean. Warm water that is clarified by energetic microorganisms has high transparency and is kept in an extremely beautiful state. In a bath where water is exchanged every day, the hot water can be kept in a clean state immediately after the water is replaced. . However, an apparatus for continuously filtering hot water by microorganisms has a feature that the hot water can be kept in a very clear state even when a very large number of people take a bath. However, in order to achieve this, it is important to be able to actively maintain microorganisms.

In the conventional circulating water heater shown in FIG. 5, the filter sheet 1 is clogged in a short time. When the filter sheet 1 is clogged, the amount of hot water circulation decreases, and the function of microorganisms is weakened. For this reason, it is necessary to stop the operation of the circulation pump 3 and frequently wash the filter sheet 1. However, in the circulating water heater of this structure, it is necessary to open and remove the casing to clean the filter sheet 1, so that the filter sheet 1 cannot actually be washed again. For this reason, the filter sheet 1 is clogged, the amount of hot water circulation is reduced, and the function of microorganisms is reduced, so that it is impossible to prevent the hot water from becoming cloudy.

In the circulating water heater of this structure, when the casing is opened and the filter sheet 1 is taken out, the dirt on the filter sheet 1 flows down together with the water. For this reason, when removing the filter sheet 1, there existed a fault that dirt mixes in warm water. Therefore, it was necessary to drain the dirty hot water flowing into the bathtub when cleaning the filter sheet and replace it with fresh water. That is, it was necessary to replace the water when cleaning the filter, and then the heater had to consume a large amount of power to heat the hot water.

However, a device that circulates hot water continuously and does not change every day only needs to maintain the temperature of the hot water at a constant temperature. For this reason, the heater only needs to be heated by the amount of natural cooling of the hot water, and the capacity of the heater can be reduced.

For example, the circulating water heater manufactured by the present inventors includes a 960 W heater. With this heater, it takes about 7 hours to raise the temperature of 30 deg. C from the normal temperature to about 40 deg. For this reason, if you clean the filter and replace the water, you will not be able to take a bath for 7 hours after cleaning the filter. The capacity of the heater may be large, for example, 2 to 3 KW. However, if the heater capacity is large, it cannot be connected from a normal outlet, and a dedicated wiring is required, so that wiring work becomes difficult.

The present inventors have prototyped filters of various shapes for the purpose of extending the period until the filter is clogged. The filter that is most difficult to clog was formed by bending water-resistant filter paper into a corrugated shape, making the overall shape cylindrical, and significantly increasing the surface area. However, the filter having this structure also increased the hot water permeation pressure loss as the filter was used, reducing the amount of hot water circulation, and required replacement once every one to two months. The inventor of the present invention has identified the flow direction of the cylindrical filter, and has developed a method in which the accumulated flow when the filter is replaced is not mixed into the warm water (Japanese Utility Model Application No. 60-204625).

[0018]

[Problems to be solved by the invention]

 However, this new method did not significantly extend the filter replacement period. The inventor closely observed the accumulated filter to manage the filter easily. As a result, it was clarified that the organic soft body and hair that grew into relatively large particles were the largest cause of filter clogging.

Therefore, provided that the organic soft body and hair are not deposited, the service life of the filter can be significantly extended. In particular, the organic flexible body has a property of being highly adherent and being easily deformed when pressed by the hot water fluid pressure to be in a pressed state and easily clogged.

The present invention has been developed to solve the drawbacks of the conventional circulating water heater, and an important object of the present invention is to provide a circulating water heater for a bath which can be easily maintained and inspected. In providing the device.

Another important object of the present invention is to provide a circulating hot water device for a bath that can easily remove foreign substances deposited on a primary filter and prevent a decrease in a circulating amount of hot water.

Still another important object of the present invention is to provide a circulating hot water device for a bath which can realize an excellent filtering action over a long period of time and can effectively remove foreign substances in the hot water.

[0023]

[Means for Solving the Problems]

 The circulating water heater for a bath of the present invention has the following configuration to achieve the above-mentioned object. The circulating water heater for a bath of the present invention includes a circulating water heater J connected to a bathtub 7 via circulation pipes 5 and 6. The circulating water heater J has a hot water channel, in which a circulating pump 9, a heater 10, and a granular filter 21 are provided. The circulation pump 9 draws in hot water in the bathtub and forcibly circulates the hot water in the hot water channel, heats the circulated hot water to a predetermined temperature by the heater 10, and filters the warmed hot water through the granular filter 21. It is configured to return to the bathtub after passing through.

Further, in the circulating hot water device for a bath of the present invention, a primary filter A is attached to an opening portion of the suction side circulation pipe 5 in the bathtub. The primary filter A includes a casing connected to an opening of the suction-side circulation pipe 5 in the bathtub, and a filter material 33 detachably incorporated in the casing. The casing of the primary filter A includes a case body 35 to which the filter material 33 is detachably attached, and a cover 34 detachably attached to the case body 35. The case body 35 of the primary filter A includes an insertion tube 30 which is inserted and connected to an opening in the bathtub of the suction-side circulation pipe 5, and a filter mounting portion 32 in which a filter material 33 is detachably mounted. And The filter mounting portion 32 is formed to be larger than the insertion tube 30 by the flange 31 connected to the insertion tube 30, and a filter material 33 larger than the inner shape of the insertion tube 30 can be detachably attached to the filter mounting portion 32. It is attached to.

Further, in the circulating hot water device for a bath according to the second aspect of the present invention, the insertion tube 30 is inserted into and detached from the opening of the suction-side circulation pipe 5 inside the bathtub in a detachable manner.

[0026]

[Action]

 In the circulating water heater for a bath according to the present invention, a circulating water heater J is connected to a bathtub 7 through circulation pipes 5 and 6. The circulating water heater J circulates the hot water in the bathtub 7. The hot water circulated through the circulation water heater J is heated by the heater 10 and is kept at, for example, 39 to 46 ° C., and is kept clear by microorganisms that inhabit the granular filter 21 of the circulation water heater J. .

In the circulating water heater of the present invention, the hot water in the bathtub is filtered by the filter material 33 of the primary filter A and then circulated to the circulating water heater J. This is because the primary filter A is connected to the open end of the suction-side circulation pipe 5. The hot water filtered by the filter material 33 of the primary filter A is free of the organic soft body and hair, which are the biggest causes of clogging of the filter.

[0028]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The bath circulating water heater shown in FIG. 1 includes a suction-side circulation pipe 5, a discharge-side circulation pipe 6, a circulation water heater J connected to the bathtub through these circulation pipes, and a suction-side circulation pipe 5 And a primary filter A provided at an open end in the bathtub.

The circulating water heater J continuously circulates hot water in the bath tub 7 in the bath tub 7, keeps the hot water at a set temperature in a range of, for example, 39 ° C. to 46 ° C., and removes dirt in the hot water. And sterilize.

The circulating water heater J includes a thin cylindrical frame 8, a circulating pump 9 provided in a hot water channel in the frame 8, a heater 10, and a filter 11. That is, the circulating water heater J is composed of a frame body 8, a circulation pump 9 provided at the bottom of the frame body 8, and a hot water pipe connected to the discharge side of the circulation pump 9 to push hot water to the upper part of the casing. 12, a filter 11 for filtering the hot water discharged from the hot water pipe 12, and a heater 10 for heating the clear hot water filtered by the filter 11 to a set temperature.

The frame body 8 is formed in a double cylindrical shape by the outer cylinder 13 and the inner cylinder 14, and a heat insulating material 15 is filled between the outer cylinder 13 and the inner cylinder 14, and the inner cylinder 14 is insulated. 14 forms a part of a watertight water channel.

The frame 8 is closed at its upper end with a lid 16 that can be opened and closed so that the filter 11 stored in the inner cylinder 14 from above can be taken out and cleaned. With the lid 16 fixed, the upper end of the inner cylinder 14 is hermetically sealed.

An air vent valve 17 is connected to the lid 16, and the air vent valve 17 is used to discharge air stored in an upper portion of the inner cylinder 14 to the outside.

A bottom plate 18 is fixed to the lower part of the inner cylinder 14 in a watertight manner, and forms a hot water chamber 19 closed by the bottom plate 18, the inner cylinder 12 and the lid 16 in a watertight manner.

The center of the inner cylinder 14 is vertically penetrated, and a hot water pipe 12 having an upper end opening is disposed. The lower end of the hot water pipe 12 is connected to the discharge side of the circulation pump 9, and the suction side of the circulation pump 9 is circulated. It is connected to the bottom of the bathtub 7 via a pipe 5.

The hot water chamber 19 has a built-in four-stage filter that can be pulled out. The filter 11 is composed of a sheet filter 20 at the top and a granular filter 21 using natural stone.

As shown in the horizontal cross-sectional view of FIG. 2, the sheet filter 20 has a filter paper 22 having a cylindrical shape as a whole sandwiched between a bottom plate 23 and an upper plate 24. A pipe 26 that opens a through hole 25 through which the hot water pipe 12 is inserted is fixed.

As the filter paper 22, any sheet material through which warm water can pass and dirt can be filtered, for example, paper made of natural or synthetic pulp, nonwoven fabric, woven fabric, or the like can be used, and the overall surface area is increased. For this reason, it is folded into a waveform.

The bottom plate 23 and the upper plate 24 are provided with grooves on opposing outer peripheral surfaces, and the upper surface and the lower surface of the filter paper 22 are fitted into the grooves, and the filter paper 22 is fixed to the bottom plate 23 and the upper plate 24. Has been.

The bottom plate 23 is entirely closed so that hot water does not pass therethrough, the top plate 24 has an inlet 27 for hot water opened at the center, and the top plate 24 and the bottom plate 23 are connected via a central pipe 26. Linked to each other.

The upper plate 24 has an outer shape that comes into contact with the inner surface of the inner cylinder 14 in a state where the upper plate 24 is inserted into the inner cylinder. The outer shape of the bottom plate 23 is smaller than the inner surface of the inner cylinder 14. This creates a gap for hot water flow.

The tubular sheet-like filter with a bottom can be filled with a filter material such as natural stone.

The granular filter 21 is mounted inside the inner cylinder 14 so as to be able to be pulled out. The hot water flowing in from the upper side was opened upward, and a water hole was formed at the bottom so that the hot water could be filtered and sterilized by the granulated natural stone 28 by flowing down through the water vertically. A pipe 29 having a cylindrical shape and through which the hot water pipe 12 penetrates is fixed.

The primary filter A shown in FIGS. 3 and 4 includes a casing that can be easily attached to and detached from the opening end of the circulation pipe 5 on the suction side in the bathtub 7, and a filter material 33 incorporated in the casing. The casing is freely inserted into and out of the open end of the circulation pipe 5, that is, an insertion tube 30 whose outside diameter is slightly smaller than the inside diameter of the circulation pipe 5, a flange 31 that hits the opening end of the circulation pipe 5, and a surface of the built-in filter material 33. And a cover 34 that covers the cover. The filter material 33 is provided in a cylindrical filter mounting portion 32 communicating with the flange 31 of the casing. As shown in the figure, the cylindrical filter mounting portion 32 connected to the insertion tube 30 via the flange 31 that hits the opening edge of the circulation pipe 5 becomes larger than the inner shape of the insertion tube 30. The filter material 33 to be mounted is also larger than the inner shape of the insertion tube.

The insertion tube 30, the flange 31, and the filter mounting portion 32 are integrally formed of a synthetic resin to form a case body 35, and the filter material 33 and the cover 34 are detachably mounted on the case body 35. .

As the filter material 33, for example, synthetic resin foam having open cells, water-resistant filter paper, nonwoven fabric, mesh material, or fine powder such as pebbles stored in a water-permeable bag, alone or A plurality of types can be used in a laminated state. The filter material 33 does not need to remove all the foreign substances contained in the warm water, and it is preferable that the filter material 33 effectively remove the organic soft body in the warm water. Therefore, the filter material 33 has a mesh size larger than that of the sheet filter 20 in the circulating water heater, for example, an average void size or mesh size of 0.2 mm or more, preferably about 0.3 to 5 mm. Use the one from

As the filter material 33, a flexible material that can be freely deformed by hand can be conveniently used. Even if a large amount of deposits accumulate on the surface of the flexible filter material 33 and are firmly adsorbed to the suction opening end by water pressure, the filter material 33 can be easily removed simply by pulling and deforming a part of the filter material 33. As shown in FIG. 3, the flexible filter material 33 is preferably held on its back surface by a support member 36 provided on the case body 35, thereby preventing bending due to water pressure.

The primary filter A shown in FIG. 3 can be removed from the circulation pipe 5 on the suction side only by pulling it out. Is absorbed in a state where it does not fall off.

In the circulating water heater configured as described above, as shown in FIG. 1, the circulating pump 9 sucks the hot water in the bathtub 7 and filters the hair and the large organic soft material with the primary filter A. Then, the hot water is sent to the sheet filter 20 through the hot water pipe 12, where the fine particles contained in the hot water are removed inside the filter paper 22, and the clear hot water flows down to the granular filter 21, where it is sterilized. Then, the filtered hot water is returned to the bathtub 7 through the lower part of the hot water chamber 19.

Although not shown, the hot water chamber 19 is provided with a temperature sensor, which controls the energization state of the heater 10 to control the temperature of the hot water to the set temperature.

[0051]

[Effect of the invention]

 In the circulating water heater of the present invention, a relatively large organic flexible material having high adhesiveness is separated from the hot water by filtering through a filter material of a primary filter provided at an end of the opening of the circulating pipe. If the organic flexible body is fine particles, it may not be possible to filter efficiently with the filter material of the primary filter. However, advantageously, the organic soft body contained in warm water is a flexible material that does not have a specific shape in warm water, has a relatively large average size, and is a coarse filter material with a mesh of 1 mm. It can be filtered effectively.

In the circulating water heater of the present invention, the hot water from which the organic soft body has been removed by the filter material of the primary filter flows into the granular filter in the circulating water heater. Therefore, in the warm water supplied to the granular filter, the organic soft body and the hair which accumulate in the gaps between the granular filters and cause clogging thereof are removed. Therefore, the amount of the organic flexible material that accumulates on the granular filter and clogs the particulate filter can be extremely reduced, and the period of use of the granular filter can be significantly extended.

By the way, in the experiment of the present inventor, the circulating water heater not using the primary filter has a built-in improved filter as described above, even if it has a built-in improved filter. In this case, clogging occurs in one to two months, and the filtration effect is reduced. In contrast, the device of the present invention, which is equipped with a primary filter having a mesh of 1 mm and a filter material having a surface area of 20 cm ² , has a capacity of 4 mm as long as the primary filter is cleaned once every several days. Even after use for up to 5 months, the filtering effect of the granular filter hardly decreased.

FIG. 6 shows a change in flow rate between the circulating water heater of the present invention and a conventional apparatus. In this figure, the curve A shows the change of the flow rate with respect to the use time of the circulating water heater of the present invention. Curve B shows the flow rate change of a conventional circulating water heater without a primary filter.

As shown by the curves A and B, as the circulating water heater filters hot water, foreign matters accumulate on the filter and the permeation pressure loss increases, and as a result, the flow rate decreases. However, in the circulating water heater of the present invention, each time the primary filter is washed, clogging of the filter is eliminated, and a decrease in the circulating flow rate can be prevented for a long period of time.

On the other hand, in the conventional circulating water heater, it is extremely difficult to clean the filter, so that the circulating flow rate is reduced by the foreign matter deposited on the filter.

The decrease in the circulation flow rate affects the turbidity of the hot water in the bathtub. The reason is that when the flow rate supplied to the granular filter decreases, the ability of microorganisms to clarify hot water decreases, and the amount of water circulating to the granular filter decreases.

Table 1 shows the water quality measurement results of the bath circulating water heater of the present invention and a conventional circulating water heater without a primary filter.

The circulating water heater of the present invention uses the structure shown in FIG. 1, and the conventional circulating water heater uses a device without a primary filter in the bathtub as shown in FIG. did . In other words, in order to clarify the effect of the primary filter in the bathtub, the circulating water heater of the present invention was compared with the conventional circulating water heater with the same structure except for the presence of the primary filter in the bathtub. .

As shown in this table, the circulating water heater of the present invention has 140 people (the number of bathers in the conventional circulating water heater was 56, so the total number of bathers is 2.5 times the conventional number). The hot water remained remarkably clear despite a significant bathing.

For example, comparing general bacteria, the amount of hot water filtered by the circulating water heater of the present invention was extremely small at 35 cells / ml, whereas that of the conventional circulating water heater was 4000 cells / ml, which was 100 times or more. It became. Incidentally, the Ministry of Health and Welfare Ordinance No. 56 specifies a standard value of "100 or less" for the number of general bacteria.

[0062]

[Table 1] ┏━━━━━━━━━━━━━━━━━━━┳━━━━━━┯━━━━━━━┓ ┃ の Conventional │ 考 の┃Circulating water heater│Circulating water heater ┃ ┣━━━━━━━━━━━━━━━━━━━╋━━━━━━┿━━━━━━━┫ 細菌 General bacteria ┃4000 Pcs / ml│ 35 pcs / ml ┃ ┃ ┃Escherichia coli 検 出 Detection │ 0 ┃ ┠───────────────────╂──────┼───────┨ ┃ Nitrate nitrogen and nitrite nitrogen ┃ 12.3 mg / l │ 2.0 mg / l ┃ ┠───────────────────╂──────┼───────┨ ┃ Organic matter (permanganese Potassium salt consumption) 消費 6.6 mg / l │ 0.6 mg / l ┃ ┠───────────────────╂──────┼─ ┃ ┃Ammoniacal nitrogen 未 満 less than 0.1mg / l│ less than 0.05mg / l┃ ┠───────────────────╂───── ┃ ┃ Odor 異 Off-flavor │ No abnormal odor ┃ ┠───────────────────╂──────┼─── ┃ ┃ Turbidity ┃ 1 degree │ less than 0.1 degree ┃ ┠───────────────────╂──────┼────── ─┨ ┃Evaporation residue ┃ 246 mg / l │ 148 mg / l ┃ ━━┛

In the circulating water heater of the present invention, zero MPN / 100 milliliters was detected in the circulating water heater, whereas this was detected in the conventional circulating water heater. Escherichia coli group is defined as "not detected" in the Ministry of Health, Labor and Welfare Ordinance No. 56.

In the case of nitrate nitrogen and nitrite nitrogen, the circulating water heater of the present invention weighed 2.0 mg / liter, whereas the conventional circulating water heater weighed 12.3 mg / liter. Was. The nitrate nitrogen and the nitrite nitrogen are specified as “10 mg / liter or less” in the Ministry of Health and Welfare Ordinance No. 56.

Further, the turbidity indicating the dirt of the hot water is less than 0.1 in the circulating water heater of the present invention, whereas it is less than 1 in the circulating water heater of the present invention. The device was able to clarify the hot water 10 times. Turbidity is specified as "less than 2 degrees" in the Ministry of Health and Welfare Ordinance No. 56.

Further, with regard to the odor, the circulating water heater of the present invention did not have an abnormal odor, while the conventional circulating water heater had an unpleasant odor.

However, in the preparation of Table 1, the measurement conditions were set as follows. The circulating water heater of the present invention collected and measured hot water bathed in 140 people for about 70 days. The conventional circulating water heater measures hot water taken by bathing 56 people during the 15 days. The motor built in the circulating water heater was 200W. As the particulate filter, a filter having a particle diameter of 5 mm to 15 mm was used. Urethane foam foamed into open cells was used as the filter material of the primary filter installed in the circulating water heater of the present invention. The straight form of the urethane foam was 105 mmφ, and the thickness was 10 mm. The primary filter was washed once every two days. As described above, the circulating water heater of the present invention realizes a feature that the hot water can be kept clear for a long period of time despite many people taking a bath.

Further, the circulating water heater for a bath according to the present invention detachably connects the primary filter to the opening of the suction-side circulation pipe in the bathtub and detachably attaches the primary filter to the casing. Built-in filter material. The primary filter is removed from the opening in the bathtub, and the filter material is removed from the casing of the primary filter. The organic flexible material is easily, easily, and completely cleaned and attached. It has the feature that it can remove neatly. For example, when taking a bath every day, the filter material can be removed from the casing of the primary filter to remove the adhered organic flexible body.

As described above, the circulating water heater according to the present invention, which can easily wash the primary filter, can always keep the primary filter clean by taking a bath. Therefore, the primary filter efficiently filters the hot water to remove the organic flexible body, and the hot water from which the organic flexible body has been removed is filtered by the granular filter of the circulating water heater. For this reason, the granular filter does not become clogged with the organic flexible material, and a large amount of warm water and oxygen are supplied to the microorganisms living on the granular filter, so that the warm water can be filtered in an ideal state. is there.

Further, in the circulating water heater of the present invention, the filter material can be securely mounted on the casing by using the water pressure sucked by the circulating pump. In addition to secure mounting, the primary filter can be securely mounted in the opening of the suction side circulation pipe in the bathtub. This is because this device uses a flange that connects the filter mounting part of the casing that detachably mounts the filter material to the insertion cylinder that detachably inserts and connects the casing to the opening inside the bathtub. This is because the filter material is made larger and the filter material larger than the inner shape of the insertion tube is detachably attached to the filter attachment part. The water pressure at which the circulating pump sucks hot water and the force to adsorb the filter material are proportional to the product of the water pressure at the suction side of the circulating pump and the area of the filter material. For this reason, the force with which the filter material is attracted to the filter mounting portion is proportional to the area of the filter material. The filter material attached to the casing that has a large filter attachment portion with the flange connected to the insertion tube is larger than the inner shape of the insertion tube, and is attached to the filter attachment portion with a strong suction force. Furthermore, the adsorption power of the filter material ensures that the primary filter is adsorbed to the opening in the bathtub. Ensuring that the filter material, or the filter material and the primary filter, can be installed in place is extremely important for this type of equipment. Old and young men and women taking a bath remove the filter material and the primary filter from the opening inside the bathtub, remove the removed filter material from the casing and wash it, store the washed filter material in the casing, and put the primary filter in the casing. Is attached to the opening in the bathtub. In addition, since this cleaning operation is frequently performed, it is important to ensure that the filter material and primary filter are installed in an accurate state every time washing is performed. If the filter material and the primary filter are not properly installed, foreign substances such as organic flexible bodies will be sucked into the particulate filter through the opening in the bathtub and clog the particulate filter. Furthermore, if the primary filter attached to the opening in the bathtub comes off, the opening in the bathtub of the suction-side circulation pipe is greatly opened, and the towels dropped into the bathtub may be sucked into the suction-side circulation pipe. is there. Large foreign substances such as towels inhaled from here can get clogged in the circulating pump or granular filter and cause malfunction. For this reason, it is necessary to frequently remove the filter material and the primary filter for cleaning, but it is important to always attach the filter to the opening of the suction side circulation pipe in the bathtub. The circulating water heater of the present invention utilizes the water pressure at which the circulating pump sucks hot water to adsorb the filter material and the primary filter and securely attach them. In particular, the circulating water heater of the present invention operates the circulating pump continuously for 24 hours. Therefore, when the filter material and the primary filter are removed, and the circulating pump is washed and installed, the hydraulic pressure of the circulating pump to be operated is reduced. The feature is that it can be surely adsorbed at a fixed position.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus showing one embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a sheet filter.

FIG. 3 is a sectional view of a primary filter.

FIG. 4 is a front view of a primary filter.

FIG. 5 is a schematic sectional view of a conventional circulating water heater for a bath.

FIG. 6 is a graph showing a change in flow rate between the circulating hot water device of the present invention and a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter sheet 2 ... Natural stone filter 3 ... Circulation pump 4 ... Lid 5 ... Circulation pipe 6 ... Circulation pipe 7 ... Bathtub 8 ... Frame 9 ... Circulation pump 10 ... Heater 11 ... Filter 12 ... Hot water pipe 13 ... Outer cylinder 14 ... Inner tube 15 ... Insulation material 16 ... Lid 17 ... Air vent valve 18 ... Bottom plate 19 ... Hot water chamber 20 ... Sheet filter 21 ... Granular filter 22 ... Filter paper 23 ... Bottom plate 24 ... Top plate 25 ... Through hole 26 ... Pipe 27 ... Inlet 28 ... Natural stone 29 ... Pipe 30 ... Insertion tube 31 ... Trim 32 ... Filter mounting part 33 ... Filter material 34 ... Cover 35 ... Case body 36 ... Support member A ... Primary filter J ... Circulating water heater

Claims (2)

[Utility model registration claims] 1. A circulating water heater (J) connected to a bathtub (7) via circulating pipes (5) and (6).
Has a hot water channel, in which a circulating pump (9), a heater (10), and a granular filter (21) are provided, and the circulating pump (9) sucks hot water in the bathtub to supply hot water. The hot water circulated is forcibly circulated, and the circulated hot water is heated to a predetermined temperature by a heater (10), and the heated hot water is filtered by a particulate filter (21) and returned to a bathtub. In the circulating water heater for baths, a primary filter (A) is attached to the opening of the suction side circulation pipe (5) in the bathtub, and the primary filter (A) is connected to the suction side circulation pipe (5). The casing includes a casing connected to the opening in the bathtub, and a filter material (33) detachably incorporated in the casing. The casing of the primary filter (A) includes a filter material (3).
A case body (35) for detachably attaching the 3) and a cover (34) detachably attached to the case body (35) are provided, and the case body (35) is provided with a suction-side circulation pipe (5). The insertion tube (30) connected to the opening inside the bathtub and the filter material (3
Filter mounting part (3
The filter mounting portion (32) has a flange (3) connected to the insertion tube (30).
1) that the filter material (33) formed larger than the insertion tube (30) and larger than the inner shape of the insertion tube (30) is detachably mounted on the filter mounting portion (32). Features a circulating water heater for baths. 2. The circulating hot water device for a bath according to claim 2, wherein the insertion tube (30) is detachably inserted into and connected to an opening in the bathtub of the suction-side circulation pipe (5).