JP3148593B2 - Bath water circulation filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water circulation / filtration apparatus which purifies and circulates bath water by using a biological filtration tank and enables bathing without replacing bath water for a long period of time.

[0002]

2. Description of the Related Art In a conventional bath water circulating and filtering apparatus in which bath water is circulated by a pump and purified by a purification tank provided in a circulation path, wastewater (suspended S) of the bath water is provided in the filtration tank.
(hereinafter referred to as SS) is biodegraded with degrading bacteria and purified in a biological filtration tank. The filter media is composed of single or composite barley stone, ceramic balls, porous ceramic, activated carbon, etc. Used.

[0003] However, when the frequency of bathing is high, unresolved SS is deposited in the filter tank, and the filter media are adhered to each other to form a lump. For this reason, a part of the filtration tank is clogged, and the degree of the clogging is unevenly generated. As a result, the purification capacity is reduced and the accumulated S
Problems such as the outflow of sulfur into the bathtub occur.

[0004] In order to prevent these problems, it is necessary to wash the filtration tank in a timely manner. Therefore, the user himself removes the filter medium and manually cleans it, or switches the backwashing method of removing the SS component by an automatic mechanism, that is, the bath water circulation method, circulates from the bottom to the top, makes the filter medium a floating state, and There is a method of removing. Therefore, in general, the separation mechanism for SS includes a method of stirring the filter medium with a stirring blade driven by a motor, a method of cyclically stirring a lift-type filter medium, and the like.

FIG. 12 is a sectional view of a lift-type purifying unit described in, for example, Japanese Patent Application Laid-Open No. 6-304586. In the figure, the solid line shows the flow of raw water at the time of filtration, and the alternate long and short dash line shows the flow of wash water at the time of back washing. Filtration tank 31
Has a filtration layer 32 filled with a filter medium, and is held by a partition plate 33. Flow path pipe 34 is provided at an upper portion of the filtration tank 3 1.

A guide tube 35 is provided upright at a predetermined interval above the partition plate 33, and an ejector 37 is constituted by its suction port 35a and the water discharge port 36a of the washing water supply pipe 36.
Cleaning water supply pipe 36 of the above process water drain and out tube 38 and the inside concentric to the bottom of the filtration tank 31, the outlet 36a is kicked set at a predetermined interval in the partition plate 33.

In the above configuration, as a filtration operation, raw water is supplied to the filtration layer 32 from the flow path pipe 34, filtered, and then reduced from the treated water discharge pipe 38. Further, as a reverse cleaning operation, cleaning water is supplied from the cleaning water supply pipe 36,
By being jetted by the water outlet 36a, the ejector 3
At 7, the filter medium is drawn into the guide cylinder 35 from the suction port 35a, and the filter medium is discharged from the discharge port 35a of the guide cylinder 35. The released filter medium is reduced by the filtration layer 32 to form the filtration tank 31.
To go around. In addition, the released cleaning water contains SS, and is discharged to the outside via the flow path pipe 34.

[0008]

Since the conventional bath water circulating and filtering apparatus is constructed as described above, since the guide tube 35 is buried in the filter layer 32, when the filter medium is blown up, the guide tube 35 is closed. will be full up to the outlet 35 b, not blown up smoothly, there is a problem in that clogging. Further, since a separation mechanism for separating the filter medium extracted from the guide cylinder 35 from the washing water containing the SS component is not provided, the SS component is not sufficiently discharged, and the cleaning effect is insufficient. there were. Furthermore, the filter medium of the guide tube 35 near is easy cyclic, since the filter medium of the filtration tank 31 near the outer periphery is hard to patrol, it was impossible washed without fully Amane filtration layer 32.

In general, a porous filter material, for example, a porous material obtained by crushing natural stone and sintering it in a porous state is used. As the bath water passes through the particulate filter medium, the porous material becomes porous. Microorganisms are generated in the pores, and a mechanism is used in which ammonia (sweat) and protein (dirt) from the human body are eaten as food and decomposed. Therefore, the bathing water usually becomes cloudy for two weeks to one month (especially in areas with high chlorine content in tap water) during the generation of this microorganism,
There was a problem that odor was generated.

[0010] The present invention has been made to solve the above-mentioned problems, and ensures the automatic cleaning of the filter medium.
An object of the present invention is to provide an easy-to-use and excellent-performance bath water circulation / filtration apparatus which eliminates the need for troublesome hand-washing of a filter medium, improves the washing performance of bath water, and is free from turbidity and odor of bath water.

[0011]

According to the present invention SUMMARY OF] bath water circulation filtration device, the bath water circulating filtering apparatus der having a backwash function to wash the purification function and filtering tank for filtering the bath water in the bathtub
I, wherein the filtration tank includes a tank which filter medium is filled, and the outer tub which the inner tank is to be inserted, an annular flow path formed between the side surface of the outer tub and the side surface of the inner tub , The bottom and front of the inner tank
A bath pool formed between the bottom of the storage tank and the outside;
A first opening provided at the bottom of the tank and communicating with the annular flow path;
And parts, communicating with the bath water reservoir provided at the bottom of the outer tub
A second opening to be provided, a nozzle provided at the bottom of the inner tank and having a spout opening upward, and standing upright in the inner tank with a predetermined interval from the spout, and a lower part at the time of back washing. And a lift tube for taking in the filter medium from the inlet of the filter and extracting the filter medium to the upper outlet .
The bath water is filtered in the inner tank through the annular flow path,
It flows out of the second opening through the bath pool and is backwashed.
At the time of cleaning, bath water flowing from the second opening is jetted from the nozzle into the inner tank through the bath pool chamber, and flows out of the first opening through the annular flow path.
That's what I did .

The upper end of the lift pipe is provided above the upper surface of the inner tank.

Further, by forming a filter portion extending outwardly <br/> periphery from the center of the inner tub to lift tube lower end, more than 30 degrees upward in the bottom center on the filter portion 6
It has a taper angle of 0 degree or less .

Further, an ammonia adsorption filter is provided on the upper surface of the filter section.

Further, the bath pool is provided with a check valve for opening the opening provided in the inner tub when switching to the purifying function and closing the opening when switching to the backwashing function. .

Further, the distance between the ejection port of the nozzle and the suction port of the lift pipe is set to be 20 mm or less.

An upper cover for covering an upper opening of the filtration tank, a plurality of abutting portions provided at a portion of the upper cover facing the upper end of the inner tank, and a plurality of abutting portions provided between the bottom of the inner tank and the bottom of the outer tank. A wall portion that keeps the interval at a predetermined interval, and by closing the upper lid, presses the inner tank through the contact portion, and the bottom of the inner tank, the bottom of the outer tank, and the wall section. To form a bath pool.

Further, bath water circulating filtration having a purifying function for filtering bath water in the bath tub and a back washing function for cleaning the filtration tank.
An apparatus, wherein the filtration tank includes a tank which filter medium is filled, and the outer tub which the inner tank is to be inserted, an annular flow which is formed between the side surface of the outer tub and the side surface of the inner tub Road and the outer tub
Opening provided at the bottom of the container and communicating with the annular flow path
A second opening provided at the bottom of the outer tank, a nozzle provided at the bottom of the inner tank and having a spout opening upward, and the inner tank having a predetermined interval from the spout. It is erected within the lift tube withdrawn from the lower portion of the intake port during the backwash to the discharge port of the upper captures filter medium, and the upper lid for covering an upper opening of the filtration tank, between the upper end of the tank and the upper cover Formation
Is, and a gap flow path having a flow path cross-sectional area which does not pass through the communicating filter medium and the inner tank and the annular channel, during filtration
The bath water flowing in from the first opening is the annular flow.
From the second opening after being filtered in the inner tank through a path
It flows out and flows in from the second opening at the time of back washing.
Bath water is jetted from the nozzle into the inner tank, and the
Outflow from the first opening through the flow path and the annular flow path
It is something to do . Further, the inner surface of the upper lid is formed in a spherical shape.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a bath water circulation filtration device, FIG. 2 is a cross-sectional view showing a normal filtration state of a filtration tank, and FIG. 3 is a cross-sectional view showing a back washing state of the filtration tank. In FIG. 1, the solid line shows the flow of raw water at the time of filtration, and the dashed line shows the flow of wash water at the time of back washing. In FIG. 1, reference numeral 1 denotes a bathtub, which is provided with a water inlet 2 for sucking up bath water and a water outlet 3 for reducing bath water. Reference numeral 4 denotes a circulation channel, a DC pump 5 for power of circulation, three-way valves 6a and 6b for switching a circulation channel for filtration and backwashing, a filtration tank 7 filled with a filter medium, and a ceramic heater 8 for heating bath water. , An ozone generator 9 for sterilizing bath water, a flow sensor 1 for detecting a circulating flow rate
0, a thermistor 11 for detecting the temperature of bath water, and a drain port 12 for discharging sewage during back washing.

Reference numeral 13 denotes a port 1 connected to the circulation flow path 4
A cylindrical outer tank having 4 and 15 and a cylindrical inner tank 16 having a bath water circulation port 16a on the bottom surface. The inner tank 16 is inserted at the concentric position of the outer tank 13, and the annular tank formed between the side surfaces of the two tanks is installed so as to form an annular flow path 17.
By fitting an annular wall surface erected on the bottom of the outer tub 13 and a wall surface formed on the bottom surface of the inner tub 16 opposed thereto via an O-ring 18, a gap between the bottoms of the two tubs is formed. , A bath pool chamber 19 is formed.

Here, the bath pool 19 will be described. In the event that air enters the flow path during backwashing due to the formation of the bath pool chamber 19 (for example, the water intake port 2 provided in the bathtub 1 may be erroneously raised from the bath water). When the air is inhaled), the inhaled air is alleviated in the bath pool chamber 19, so that the inhaled air does not lower the backwashing ability. Further, even if the amount of circulating bath water is reduced due to dust clogging in the water suction port 2, the amount of bath water passing through the nozzle 23 is supplied from the bath pool chamber 19, so that the amount of bath water is constant and the back washing is performed smoothly. Can do it.

Reference numeral 20 denotes a filter medium which is filled in the inner tank 16 and held by a filter 21 provided below the inner tank 16 and described later. Further, on the bottom surface of the inner tank 16, the plane partition plate 22 and the nozzle 23 are joined. The nozzle 23 is provided with an ejection port 23a so that the performance of the DC pump 5, that is, the momentum of the jet with respect to the circulating flow rate is maximized.
The diameter of is narrowed down. Reference numeral 24 denotes a net, which is provided on the upper surface of the spout 23a to prevent the filter medium 20 from being filled. 2
Reference numeral 1 denotes a filter, which is provided so that the filter medium or fine powder of the filter medium does not flow into the bathtub. Reference numeral 25 denotes a lift pipe, a lower suction port 25a is kept at an appropriate distance from the ejection port 23a of the nozzle 23, and a plurality of columns 25c are arranged so that the upper discharge port 25b is located above the upper surface of the inner tank 16. It is erected by. Then, the ejector 26 is constituted by the lift pipe and the nozzle.

Here, the arrangement position of the lift pipe 25 will be described. When the discharge port 25b of the lift pipe is provided in the inner layer from the upper end of the inner tank 16, when the filter medium 20 is filled up to the upper end of the inner tank 16, the filter medium 20 is inserted into the lift pipe 25.
Drops and the lift tube 25 is clogged. In such a configuration, in backwash flow 13l / min, when the remaining amount of the filter medium 20 is not also less than half least the length of the lift tube 25, the initial blowing up the start Mala no use The filter media is reduced and the filtering effect is reduced.

Therefore, the upper part of the lift pipe 25 is
By providing it above the upper end of 6, the filter medium 20 can be inserted up to the upper end of the inner tank 16, and at the time of filtration, the filtering effect can be sufficiently exhibited. Also, at the time of backwashing, the filter medium 20 does not enter the lift tube 25, so that always backwashing can be reliably performed.

The upper opening of the outer tub 13 is closed by a spherical dome-shaped upper lid 27. An O-ring 28 is provided on the outer periphery of the lower edge of the upper lid 27. By attaching the upper lid 27 to the outer tub 13, the O-ring 28 is tightened to be in a sealed state. At this time, the inner tank 16 is pressed downward to reinforce the airtightness of the O-ring 18.

Here, the shape of the upper lid will be described. When the upper cover 27 is flat (for example, FIG. 12), when the filter medium 20 is blown up from the lift pipe 25 during the back washing, the filter medium 2
0 corresponds to the inner surface of the upper lid 27, but reflects because of the flat surface,
Will fall to the discharge port 25 b around the lift pipe 25, it does not fly to the far way. In other words, the filter medium 20 is biased, so that the bath water can be sufficiently filtered at the time of filtration, and the filtration performance decreases.

However, if the inner surface of the upper lid 27 is formed into a spherical shape with a center at the center, the filter medium 20 blown up from the discharge port 25b at the time of back washing hits the inner surface of the upper lid 27 and follows the inner sphere along the spherical surface. It flies up to 16 outer circumference near, deposited without full Amane the entire surface. Therefore, during normal filtration, the bath water is applied to the filter medium 20.
Mitsuru Amane without contact, filtering performance is stabilized.

A plurality of spacers 27a that contact the upper end of the inner tank 16 are provided on the periphery of the upper lid 27. Also,
The portion where the spacer 27a is not provided forms a gap flow path 27b that connects the inside of the inner tank 16 and the annular flow path 17. The gap flow path 27 b separates the filter medium 20 discharged from the lift pipe 25 from the wash water containing the SS, and discharges the wash water to the annular flow path 17.

The plurality of spacers 27a of the upper lid 27 press the inner tank 16 against the bottom of the outer tank 13 so that the inner tank 1
6 through an O-ring 18 disposed all around the bottom.
Are densely provided in the outer tank 13. When the airtightness between the inner tub 16 and the outer tub 13 is low (when the inner tub 16 is not sufficiently close to the outer tub 13), at the time of the reverse cleaning, the washing water entering from the port 15 is supplied to the port 14 side. Is high, the amount of water flowing toward the nozzle 23 of the washing water is reduced, the blowing force is weakened, and the filtering medium 20 is not blown up by the jet flow.
There is a high possibility that the effect of back washing will be reduced. Therefore, by arranging the inner tank 16 close to the outer tank 13, the washing water entering from the port 15 does not leak to the port 14 side, and can generate a jet to improve the backwashing ability.

A check valve 29 is provided in the vicinity of the lower portion of the nozzle 23 so as to open the bath water circulation port 16a for the filtering function and to close it for the back washing function.
The provision of the check valve prevents all the bath water from flowing toward the nozzle 23 during the back washing function, thereby preventing the bath water from leaking to the bottom in the inner tank 16 and reducing the force for pushing up the filter medium 20. Further, even if the backwashing is completed or the filter medium 20 is deposited in the lift pipe 25 by the net 24, the spout 23a
To prevent the fine powder of the filter medium from entering and clogging.

Next, the operation will be described. First, the filtration (purification) flow path indicated by the solid line will be described. Bath water pumped from the bathtub 1 by the DC pump 5 is supplied to the three-way valve 6.
a is circulated in the AC direction, and flows into the filtration tank 23 from the port 14. The inflowing bath water flows into the annular flow path 17, the gap flow path 27
b, and is filtered in the inner tank 16. The filtered bath water is filtered by a filter 21, a flat partition plate 22, a bath water circulation port 16a.
And flows out of the filtration tank 7 through the port 15. The outflowing bath water circulates in the C-B direction through the three-way valve 6b, is heated and controlled to the set temperature by thermistor 11 and the temperature detection ceramic heater 8, and is sterilized by the ozone generator 9 into ozone. Will be returned.

Next, the backwashing operation (backwash flow path indicated by a chain line) will be described. The backwashing operation is automatically performed, for example, once a day, or appropriately performed by an interruption operation by a user. Bath water pumped from the bathtub 1 to the DC pump 5 circulates through the three-way valve 6b in the A-C direction as washing water, and flows into the inner bath 16 from the port 15. The inflowing washing water applies water pressure to the bath pool chamber 19 to close the check valve 29.

The washing water is concentrated and flows into the nozzle 23, generates a jet, and makes the ejector 26 a negative pressure. Due to the negative pressure, the filter medium and the convection washing water are drawn from the suction port 25 a of the lift pipe 25 and blown up in the lift pipe 25. The blown-up filter medium 20 is returned to the inner tank 16 from the discharge port 25b. SS component laden washing water in the gap passage 27 b, and flows out from the pass only the wash water without the flows through the annular channel 17 filtration tank 7 intervals smaller filter medium 20. The outflowing washing water circulates through the three-way valve 6a in the C-B direction and is discharged from the drain port 12.

Embodiment 2 A filter medium used in the bath water filtration and circulation device will be described. Among the filter media used in the bath water filtration and circulation device, activated carbon has a large specific surface area and a high adsorption capacity as compared with ceramic balls, and the fine holes are most suitable for the residence of microorganisms. In addition, since the specific gravity is lighter than that of a purification stone such as a ceramic ball, it is an appropriate material for removing the SS by friction by moving the filter medium by a water flow. Activated carbon is used as a filter medium, especially for removing the smell of bath water until the initial microorganisms rise.However, in the past, black powder tends to come out, and sometimes fine powder flows into the bathtub and sometimes accumulates at the bottom, such as after hand washing. There was also. Therefore, in the second embodiment, the JIS
The hardness was set to 98% or more, and the shape was a generally popular pellet shape.

[0035]

[Table 1]

FIG. 4 is a curve showing the relationship between the time and the purification ability, with the horizontal axis representing time and the vertical axis representing purification ability (upper limit 100%). B is a case where an aerobic microorganism is used, A and C are cases where activated carbon having a JIS hardness of 98% or more is used,
A indicates the case where the automatic cleaning is performed, and C indicates the case where the automatic cleaning is not performed. D shows the case where a ceramic ball or the like is used.

In the activated carbon method (C), as shown in the figure,
At first, it purifies with the adsorption capacity and then automatically cleans,
Maintain 90% or more of initial capacity. Further, in the aerobic microorganism (B), since the aerobic microorganism is generated within a few days to two to three weeks, the purification ability increases. Embodiment 2
According to the report, using activated carbon pellets with a JIS hardness of 98% or more, and double purification by physical adsorption and biological filtration,
Reliable filtration can be performed from the beginning of use.

Embodiment 3 The configuration of the lift tube and the filter will be described. FIG.
Is a perspective view showing a configuration of a lift tube and a filter,
FIG. 6 is an enlarged view of the filter. At the lower end of the lift tube 25, an opening 25d partitioned by a support 25c is formed. At the time of back washing, the filter medium 20 blows up onto the lift tube 25 through the opening 25d. The openings 25d are formed in at least three places to uniformly blow up the filter medium. In addition, a slit 21a through which bath water passes is provided on the inner surface of the filter 21, as shown in FIG.
In order to reduce the imbalance in the degree of opening from the outer periphery to the center, the slit width H is set to 2 mm or less at maximum (smaller than the minimum diameter of the filter medium). Therefore, the number of the support frames 21b on the center side is half the number of the support frames 21c on the circumferential side . The support frame in the circumferential direction is the support frame 21 on the center side.
The contact resistance of the filter medium 20, which is disposed on the opposite side (back side) of the support frame 21 c and the circumferential side support frame 21 c, is small and smooth.

Also, the filter 21 has a taper angle.
The movement during backwashing of the filter medium 20 is improved by the addition.
This has the effect of stabilizing the backwashing ability. For example, as shown in FIG. 12, when the filter 21 is flat, the filter medium 20 has a large resistance due to its own weight from above when backwashing.
You can't blow up on 5. FIG. 7 is a curve showing the relationship between the taper angle of the filter and the moving ratio of the filter medium. In the third embodiment, it is optimal to set the taper angle of the filter 21 to 30 degrees or more and 60 degrees or less.

Embodiment 4 FIG. FIG. 8 is a sectional view of a bath water filtration and circulation device according to a fourth embodiment, and FIG. 9 is a perspective view of an ammonia adsorption filter. In the figure, reference numeral 30 denotes an ammonia adsorption filter made of a polyester nonwoven fabric, which is cut into a fan shape and rounded into a conical shape. As shown in FIG. 8, the ammonia adsorption filter 30 is provided on the upper surface of the filter 21. By providing the ammonia adsorption filter 30 on the upper surface of the filter 21, the life of the filter medium 20 is extended,
Fine powder is generated the filter medium 20 by the impact at the time of backwashing is only crushed, the effect capable of preventing the risk of discharged from the port 14. In addition, the provision of the ammonia adsorption filter 30 has an effect of adsorbing ammonia coming out of the human body during bathing and improving the purification effect of bath water.

If the thickness of the ammonia adsorption filter 30 is too large, it may become a bed of bacteria inside and the filtration performance may be deteriorated. Was set to 1 mm or less.

Embodiment 5 FIG. FIG. 10 is a configuration diagram of a bath water circulation / filtration apparatus according to Embodiment 3 of the present invention, in which the arrangement relationship of nozzles and filters is different from Embodiments 1 and 2. As shown in the figure,
The nozzle 23 is formed so as to rise to the lift pipe 25 side and to be mostly covered by the lower part of the lift pipe 25. ΔL is the difference between the ejection port 23 a of the nozzle 23 and the filter 2.
1 is the distance of the lower end. At the time of back washing, the bath water flows to the nozzle 23, is squeezed at the nozzle outlet 23 a to form a jet, and the filter medium 20 is blown up in the lift pipe 25. The time required to move the entire filter medium 20 in the inner tank 16 once is shorter as ΔL is smaller. This is because, as ΔL is smaller, filter 2
This is because the movement of the filter medium 20 in the vicinity of 1 is good and the whole moves quickly. However, if the backwashing is performed for a long time, the bath water in the bathtub 1 decreases quickly, and the water saving effect is reduced.
FIG. 11 is a curve showing the relationship between ΔL and the time required to move the filter medium 20 once.
It can be confirmed that the filter medium is rotated once within a range from = 0 mm to ΔL = 30 mm. Further, since the time does not change much when compared with the case where ΔL = 0 mm, ΔL = 20
mm or less.

[0043]

As described above, according to the present invention, when a bath pool is formed between the bottom of the outer tub and the bottom of the inner tub, and the function is switched to the backwashing function, the bottom of the outer tub bottom can be replaced . The bath water that has flowed in from the opening of No. 2 is jetted out of the nozzle through the nozzle through the bath water chamber, so that even if there is a change in the flow rate of the bath water or air is mixed in, the backwashing is not interrupted. Stable and reliable purification performance can be obtained.

Further, since the upper end of the lift pipe is provided above the upper surface of the inner tank, the filter medium does not fall into the lift pipe after the backwashing is completed, the flow of the filter medium is smooth, and the backwashing ability is stabilized. can get.

Further, by forming a filter portion extending outwardly <br/> periphery from the center of the inner tub to lift tube lower end, the filter unit is more than 30 degrees upward to the center in the bottom 6
Since have a taper angle of 0 degrees or less, the better the motion during backwashing of the filter medium, backwash capability is effective to stabilize.

Further, since the ammonia adsorption filter is provided on the upper surface of the filter section, the ammonia in the bath water is adsorbed, and the fine powder of the filter medium is stopped here. Purification performance is obtained.

Also, since the bath pool is provided with a check valve which opens the opening provided in the inner tank when switching to the purifying function and closes the opening when switching to the backwashing function, it is usually used. During the backwashing, the bath water is prevented from leaking, and the backwashing with high pressure can be performed.

Further, since the distance between the nozzle outlet and the lift pipe inlet is formed to be 20 mm or less, the filter medium can be easily moved at the time of back washing, so that the entire filter medium circulates quickly and drains the bath water. The amount discarded is reduced, the water saving effect is improved, and the reliability of the purification performance is also improved.

Further, since the inner tub is pressed by the contact portion of the upper lid to form the bath pool chamber, it is possible to easily prevent the backwash water from leaking, to take out the inner tub easily, and to maintain well. Become.

Further, since a gap flow path having a cross-sectional area that does not allow the filter medium to pass through is formed between the upper lid and the upper end of the inner tank, the filter medium and the washing water containing the SS can be separated, and the SS can be sufficiently discharged. The cleaning effect is improved. Furthermore, since the inner surface of the upper lid is formed in a spherical shape, the bath water and the filter medium during backwashing move smoothly to the outer periphery along this spherical surface, so that the deposition distribution of the filter medium after backwashing is good and the filtering capacity during filtration is good. Is also stable.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bath water circulation filtration device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the filtration tank according to Embodiment 1 of the present invention during normal filtration.

FIG. 3 is a cross-sectional view of the filtration tank according to Embodiment 1 of the present invention at the time of back washing.

FIG. 4 is a diagram showing a transition of the purification capacity of the present invention.

FIG. 5 is a perspective view showing a third embodiment of the present invention.

FIG. 6 is an enlarged view of a filter according to Embodiment 3 of the present invention.

FIG. 7 is a diagram illustrating a relationship between a moving amount of a filter medium and a taper angle at the time of back washing according to the third embodiment of the present invention.

FIG. 8 is a sectional view of a bath water circulation / filtration apparatus according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view of an ammonia adsorption filter according to Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view of a bath water circulation filtration device according to a fifth embodiment of the present invention.

FIG. 11 is a diagram illustrating a relationship between a time for moving a filter medium and a height of a nozzle during back washing according to a fifth embodiment of the present invention.

FIG. 12 is a sectional view showing a conventional bath water circulation filtration device.

[Explanation of symbols]

1 bathtub, 4 circulation channel, 7 filtration tank, 13 outer tank, 1
6 inner tank, 17 circulation channel, 18 O-ring, 19 bath pool, 20 filter media, 21 filter, 23 nozzle, 23a spout, 24 net, 25 lift tube,
27 top lid, 27a spacer, 28 O-ring, 2
9 Check valve, 30 Ammonia adsorption filter.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoji Kondo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Toshikazu Terauchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Inside (72) Inventor Kenji Nomura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (56) References JP-A-3-249994 (JP, A) JP-A-2-184398 (JP) (A) JP-A-51-82961 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 35/02 B01D 35/16 B01D 24/10 B01D 24/46 C02F 3/02

Claims (9)

(57) [Claims] 1. A bath water circulation / filtration apparatus having a purifying function for filtering bath water in a bath tub and a back washing function for cleaning the filter tub.
A is the filtration tank includes a tank which filter medium is filled, and the outer tub which the inner tank is to be inserted, an annular flow path formed between the side surface of the outer tub and the side surface of the inner tub When the bath formed between the bottom of the outer tub and the bottom of the inner tub
A first reservoir provided at a bottom of the outer tank and communicating with the annular flow path;
And an opening provided at the bottom of the outer tub and communicating with the bath pool chamber.
2, a nozzle provided at the bottom of the inner tank and having a spout opening upwardly; and a lower part being suctioned at the time of back washing when standing in the inner tank with a predetermined interval from the spout. A lift tube for taking in the filter medium from the mouth and extracting the filter medium to the upper discharge port, and at the time of filtration, the bath water flowing from the first opening is
The bath pool is filtered in the inner tank through an annular flow path.
The bath water flows out of the second opening through the second opening , and at the time of back washing , the bath water flowing from the second opening is spouted from the nozzle through the bath water chamber into the inner tank, and the annular shape is formed. Outflow from the first opening through the flow path
Bath water circulation filtering apparatus according to claim to Rukoto. 2. The bath water circulation filtration device according to claim 1, wherein an upper end of the lift pipe is provided above an upper surface of the inner tank. 3. A filter portion extending from the center of the inner tank toward the outer periphery is formed at the lower end of the lift pipe, and the filter portion is upward at 30 degrees or more and 60 degrees with the center at the bottom.
Claim 1, characterized in that to have the following taper angle
The bath water circulation filtration device as described in the above. 4. The bath water circulation filtration device according to claim 3, wherein an ammonia adsorption filter is provided on an upper surface of the filter section. 5. The bath pool is provided with a check valve that opens an opening provided in the inner tub when switching to the purifying function and closes the opening when switching to the backwashing function. The bath water circulation filtration device according to claim 1, wherein 6. The bath water circulation and filtration device according to claim 1, wherein the distance between the nozzle outlet and the lift tube inlet is set to 20 mm or less. 7. An upper cover for covering an upper opening of the filtration tank, a plurality of abutting portions provided at a portion of the upper lid facing an upper end of the inner tank, and a bottom part of the inner tank and a bottom part of the outer tank. And a wall that keeps the interval at a predetermined interval, and by closing the upper lid,
The bath water circulation according to claim 1, wherein the inner tank is pressed through the contact portion, and a bath pool is formed by the bottom of the inner tank, the bottom of the outer tank, and the wall. Filtration device. 8. A bath water circulation / filtration apparatus having a purifying function for filtering bath water in a bath tub and a back washing function for cleaning the filter tub.
A is the filtration tank includes a tank which filter medium is filled, and the outer tub which the inner tank is to be inserted, an annular flow path formed between the side surface of the outer tub and the side surface of the inner tub And a first provided at the bottom of the outer tank and communicating with the annular flow path.
An opening, a second opening provided at the bottom of the outer tub, a nozzle provided at the bottom of the inner tub and having a spout opening upward, and having a predetermined distance from the spout. A lift pipe that is erected in the inner tank and takes in the filter medium from the lower suction port at the time of back washing and extracts it to the upper discharge port; an upper lid covering the upper opening of the filtration tank; and an upper lid and an upper end of the inner tank. formed between, and a gap flow path having a flow path cross-sectional area which does not pass through the communicating filter medium and the inner tank and the annular channel, at the time of filtration, flowing from the first opening bath water Is
The second opening is filtered through the annular flow path in the inner tank.
During the backwashing, the bath water flowing out of the second opening is
The nozzle is ejected from the nozzle into the inner tank, and is
The bath water circulation / filtration device characterized by flowing out of the first opening through the annular flow path . 9. The bath water circulation filtration device according to claim 7, wherein an inner surface of the upper lid is formed in a spherical shape.