JPH06154114A - Filtering method for bathtub - Google Patents

Abstract

PURPOSE:To prevent a circulating pump from air suction while preventing a filter medium from outflow to a system outside by discharging air when the circulating pump is again filled with water after water is once drained. CONSTITUTION:When water is supplied to a bathtub 1, first a first three-way valve 8 is changed over to afford communication between a filter tank 13 and drain path 12 for back washing and a second three-way valve 9 is changed over to afford communication between a third branch water path 7 and fourth branch water path 10 to supply water from the fourth branch water path 10 to the filter tank 13 and discharge air in the filter tank 13 from the drain path 12 for back washing. Next, after water supplied to the filter tank 13 reaches almost near the upper end of the filter tank 13, the first three-way valve 8 is changed over to afford communication between the filter tank 13 and first branch water path 5 and the second three-way valve 9 is changed over to afford communication between the second branch water path 6 and fourth branch water path 10 to supply water from above to the filter tank 13 for filtration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for filtering hot water in a bathtub to exhaust air in the filter tank when the hot water is poured into the bathtub.

[0002]

2. Description of the Related Art Conventionally, there has been known a filter of a type in which dirt in a bath is filtered by passing hot and cold water in a bath circulated by a circulation pump through a filter having a filter bed on which a filter medium is placed. If the filtration tank is made of a resin molded product and there is a possibility that it will be damaged by the expansion of the residual water inside it when frozen, the residual water in the filtration tank should be drained after use. Will be needed. However, if water is supplied to the inside of the filtration tank while air is accumulated in the piping, there is a problem in that the air in the filtration tank does not escape and air clogging of the circulation pump occurs.

Therefore, the present inventor, in the process of reaching the present invention,
We considered the air venting when water is filled by using the backwashing channel provided in the filter. Here, the backwash flow passage provided in the filter is a timing that assumes that dirt has accumulated in the filtration tank to some extent, and forms a flow passage in the opposite direction to the normal filtration operation by a switching valve or the like, Normally, the dirt accumulated on the filter medium in the filtration tank is lifted up by pouring hot and cold water above the bottom of the filtration tank, and then flushed out from the top of the filtration tank to reverse the filter medium and filter bed. It is for cleaning.

[0004]

However, there is a possibility that the filter medium partially suspended in the filtration tank during the filtration operation during the drainage may adhere to the inner wall of the filtration tank, and the filtration material should be filtered before the next filtration operation. It is necessary to supply water to the tank, but at this time, the inside of the filter tank is empty, and the air between the piping under the filter tank and the circulation pump passes through the filter medium at the beginning of water supply, so the filter medium scatters and the filter tank May adhere to the inner wall of the filter, and if water is continuously backwashed in this state, the filter material adhering to the inner wall of the filtration tank will flow out of the external system, and if this is repeated over a long period of time, it will be filtered. There is a risk that the material will be reduced to such an extent that it does not function as a filter.

The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to drain water once and then replenish the water with the air exhausted to the circulation pump. It is possible to prevent the air bite of
It is an object of the present invention to provide a method for filtering a bath which can prevent the filter medium from flowing out of the system.

[0006]

In order to achieve the above object, a bathtub filtering method of the present invention circulates a suction part 2 for sucking hot and cold water in a bathtub 1 and a discharge part 3 for returning hot and cold water to the bathtub 1. The circulation pump 4 is provided in the circulation flow passage A, and is connected to the circulation flow passage A. The first branch water passage 5 is branched from a position displaced from the circulation pump 4 toward the discharge portion 3 side, and the circulation pump 4 is closer to the suction portion 2 side. The second branch water channel 6 is branched from the displaced position, and the first branch water channel 5 is connected via the first three-way valve 8 to the upper portion of the filtration tank 13 in which the filter medium 14 is placed, and the first branch water channel 5 is connected. Connect the backwash drainage channel 12 to the three-way valve 8
Of the third branch water channel 7 through the second three-way valve 9 into the third branch water channel 7 and the fourth branch water channel 10.
Is connected to the first branch water channel 5, the fourth branch water channel is connected to the lower part of the filtration tank, the drain water channel 11 is connected to the fourth branch water channel 10, and the water drain channel 11 is opened and closed. Valve 2
4 is provided, and when water is supplied to the bathtub 1, first, the first three-way valve 8 is switched so that the filter tank 13 and the backwash drainage channel 12 communicate with each other, and the second three-way valve 9 is connected to the third branch water channel 7. And the fourth
The switching tank 13 is switched to communicate with the branch water channel 10 of
After the water is supplied from the fourth branch water channel 10 to exhaust the air in the filter tank 13 from the backwash drain channel 12, the water supplied to the filter tank 13 is located near the upper end of the filter tank 13, The first three-way valve 8 is switched so that the filtration tank 13 and the first branch water channel 5 communicate with each other, and the second three-way valve 9 causes the second branch water channel 6 and the fourth branch water channel 10 to communicate with each other. It is characterized in that switching is performed and water is supplied to the filtration tank 13 from above to perform filtration.

[0007]

As described above, when water is supplied to the bathtub 1, first, the first three-way valve 8 is switched so that the filtration tank 13 communicates with the backwash drainage channel, and the second three-way valve 9 is switched to the third. The branch water channel 7 and the fourth branch water channel 10 are switched so as to communicate with each other, and the filtration tank 13 is supplied with water from the fourth branch water channel 10 to supply the filtration tank 13.
By exhausting the internal air from the backwash drainage channel 12, it is possible to prevent the air from being caught in the circulation pump 4, and the water supplied to the filtration tank 13 is stored in the filtration tank 13. After being located near the upper end, the first three-way valve 8 is switched so that the filtration tank 13 and the first branch water channel 5 communicate with each other, and the second three-way valve 9 is switched to the second branch water channel 6 and the fourth branch water channel 6. The filter medium 14 in the filter tank 13 is changed by switching the communication to the branch water channel 10 and supplying water to the filter tank 13 from above to perform filtration.
Is prevented from flowing out of the system from the backwash drainage channel 12 and is filled with water so that the filtration operation by the filtration tank 13 can be performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An example of an apparatus used in the method of the present invention is shown in FIGS. FIG. 1 is a pipeline diagram showing the entire system, FIG. 2 is a perspective view of the entire bath 1, and FIG. 3 is a pipeline diagram showing a filtration circuit portion. A suction passage 2 for sucking hot and cold water in the bathtub 1 and a discharge portion 3 for returning hot and cold water to the bathtub 1 are connected by a circulation flow path A. The circulation pump 4 is provided in the circulation passage A. The circulation flow path A is branched into nozzle water supply pipes 3a, 3b, 3c on the discharge unit 3 side of the circulation pump 4, and each nozzle water supply pipe 3
An injection nozzle 1 serving as a discharge part 3 at the tip of a, 3b, 3c
5a, 15b and a shower pad 16 for shoulder rest are provided. Here, the injection nozzles 15a and 15b are provided on the inner wall of the bathtub 1 to inject into the bathtub 1, and the shower pad 16 for shoulder rest is provided on the flange portion of the bathtub 1 so that the shower nozzle inside the bathtub 1 is arranged from above. Shower water is spouted on the shoulder of the person who enters. Reference numeral 17 in the drawing is an air inlet, which is connected to the nozzle water supply pipes 3a and 3b through an air pipe 18 so that the jet water containing bubbles is jetted into the bathtub 1 from the jet nozzles 15a and 15b. In the figure, 19, 20 and 21 are switching valves, 22 is a flow rate adjusting valve, and the control unit 23 turns on / off the circulation pump 4, switches the switching valves 19, 20, 21 and opens the flow rate adjusting valve 22. The adjustment and the like are controlled.

A first branch water channel 5 is branched from between the circulation pump 4 and the flow rate adjusting valve 22 of the circulation channel A having the above-described structure, and the circulation pump 4 and the suction portion of the circulation channel A are branched. A second branch water channel 6 is branched from between the two. First
The upper part of the filtration tank 13 is connected to the inside of the branch water channel 5 of the above through the first three-way valve 8, and the backwash drainage channel 12 is connected to the first three-way valve 8. There is. Here, a filter medium 14 such as beads or particles of sand or the like is placed on the filter bed 13a in the filtration tank 13. A third branch water channel 7 and a fourth branch water channel 10 are connected to a tip end portion of the second branch water channel 6 via a second three-way valve 9. Third branch waterway 7
Is connected to the first branch water channel 5, and the fourth branch water channel 10 is connected to the lower part of the filtration tank 13.
A water drainage conduit 11 is connected to the fourth branch water conduit 10, and a screw type on-off valve 24 is provided in the water drainage conduit 11. Here, the first three-way valve 8 and the second three-way valve 9
Are controlled by the control unit 23.

However, in the above device, when the circulation pump 4 is operated in normal operation, the hot and cold water in the bathtub 1 sucked from the suction part 2 of the bathtub 1 is the discharge part 3, the injection nozzles 15a and 15b, and the shoulder pad. In this case, the first three-way valve 8 is normally connected to the filter tank 13 and the first branch water channel as shown in FIG. 5 and the second three-way valve 9 is switched so that the second branch water channel 6 and the fourth branch water channel 10 are in communication with each other, and the discharge portion 3 is located more than the circulation pump 4 in the circulation channel A. On the side, part of the circulating hot water flows from the first branch water channel 5 through the first three-way valve 8 to the upper part of the filtration tank 13, and from the lower part of the filtration tank 13 to the fourth branch water channel 10.
Flow through the second three-way valve 9 to the second branch water channel 6 to be returned to the circulation channel A again, and the hot water purified through the filtration tank 13 is returned to the circulation channel A. As a result, the hot and cold water in the bathtub 1 is circulated and purified so that the hot and cold water can be used for a long period of time without changing.

Now, if the filtration of the bath 1 is continued, dirt will be accumulated on the surface of the filter medium 14, and if left unattended for a long time, the filtration performance cannot be maintained. Therefore, it becomes necessary to discharge the dirt on the surface of the filter medium 14 out of the system. At this time, as shown in FIG. 4, the first three-way valve 8 is switched so that the filtration tank 13 and the backwash drainage channel communicate with each other, and the second three-way valve 9 is switched to the third branch water channel 7 and the fourth branch water channel 7. When the circulation pump 4 is operated, the first branch water channel 5 →
It flows from the third branch water channel 7 to the fourth branch water channel 10 and flows into the filtration tank 13 from the lower part of the filtration tank 13, floats the filter medium 14, and passes through the first three-way valve 8 together with hot and cold water to drain water for backwashing. It is discharged from the system 12 to the outside of the system.

By the way, in a cold region or the like, in order to prevent the filter tank 13 in the pump system installed outdoors from being damaged by freezing, the open / close valve 24 of the drainage pipe 11 is opened to remove hot water from the filter tank 13. It is discharged to the outside of the system. When bathing next, the on-off valve 24 is closed and the bathtub 1
The hot water is supplied to. At this time, if the air in the filtration tank 13 is not removed, a phenomenon such as air biting will occur in the circulation pump 4. Therefore, in the present invention, when supplying water to the bathtub 1, first, as shown in FIG. 4, the first three-way valve 8 is switched so that the filtration tank communicates with the backwash drainage channel, and the second three-way valve is connected. 9 is switched so that the third branch water channel 7 and the fourth branch water channel 10 communicate with each other, and the filtration tank 13 is supplied with water from the fourth branch water channel 10 so that air in the filtration tank 13 is drained for backwashing 12. After the water discharged from the filter tank 13 and supplied to the filter tank 13 is located near the upper end of the filter tank 13, the first three-way valve 8 is connected to the filter tank 13 and the first branch water channel 5 as shown in FIG. And the second three-way valve 9 is switched so that the second branch water channel 6 and the fourth branch water channel 10 communicate with each other so that the filtration tank 13 is supplied with water from above to perform filtration. There is. Here, when water is supplied from below to the inside of the filtration tank 13 in order to exhaust the air in the filtration tank 13, the water supplied to the filtration tank 13 is located near the upper end of the filtration tank 13 in the first state. The timing at which the three-way valve 8 and the second three-way valve 9 are switched is based on this, assuming that the water has reached near the upper end of the filter tank 13 after a certain time has elapsed from the time from the start of water supply to the bathtub 1. The control unit 23 gives a signal to switch the first three-way valve 8 and the second three-way valve 9, or detects the amount of water supplied to the bathtub 1 from the start of water supply, and when the water supply amount becomes constant, the filtration tank It is assumed that water has reached the vicinity of the upper end of 13 and a signal is given by the control unit 23 based on this to switch the first three-way valve 8 and the second three-way valve 9.

The various operations by the control unit 23 can be performed by the remote controller 26.

[0014]

As described above, according to the present invention, when water is supplied to the bathtub, first, the first three-way valve is switched so that the filtration tank communicates with the backwash drainage channel, and the second three-way valve is changed to the third. The water supplied to the filtration tank by switching the branch water channel and the fourth branch water channel so as to communicate with each other and supplying water to the filtration tank from the fourth branch water channel to exhaust air in the filtration tank from the backwash drainage channel. Is located near the upper end of the filter tank, the first three-way valve is connected to the filter tank and the first
The second three-way valve is switched so that the second branch water channel and the fourth branch water channel communicate with each other, and water is supplied from the upper portion to the filtration tank for filtration. After draining the water, when refilling the water, the air can be exhausted to prevent air biting into the circulation pump and prevent the filter medium from flowing out of the system, ensuring stable filtration operation for a long period of time. It is possible.

[Brief description of drawings]

FIG. 1 is an overall piping diagram of the present invention.

FIG. 2 is an overall perspective view of the above.

FIG. 3 is a piping diagram of a filtering circuit portion of the above.

FIG. 4 is a piping diagram showing a flow at the time of back washing and a flow in an initial state of water filling in the same as above.

[Fig. 5] Fig. 5 is a piping diagram showing a flow in a filtering operation and a flow in a latter stage of water filling in the same as above.

[Explanation of symbols]

 A circulation channel 1 bath 2 suction part 3 discharge part 4 circulation pump 5 first branch channel 6 second branch channel 7 third branch channel 8 first three-way valve 9 second three-way valve 10 fourth branch Water channel 11 Drainage channel 12 Backwash drainage channel 13 Filtration tank 14 Filter medium

Claims (1)

[Claims] 1. A suction passage for sucking hot and cold water in a bathtub and a discharge portion for returning hot and cold water to the bathtub are connected by a circulation passage, and a circulation pump is provided in the circulation passage, and the discharge portion is closer to the circulation pump than the circulation pump. The first branch water channel is branched from the displaced position, and the second branch water channel is branched from the position displaced from the circulation pump to the suction side, and the first branch water channel is internally filtered through the first three-way valve. Is connected to the upper part of the filtration tank containing the water and the backwash drain is connected to the first three-way valve, and the second branch water channel is connected to the third branch water channel and the fourth branch water channel via the second three-way valve. Branch to the branch channel, connect the third branch channel to the first branch channel, connect the fourth branch channel to the lower part of the filtration tank, and connect the drain channel to the fourth branch channel. Along with the opening and closing valve in the drainage pipe, when supplying water to the bathtub, first the first three-way valve The filter tank is switched to communicate with the backwash drainage channel, and the second three-way valve is connected to the third branch channel and the fourth branch channel.
The water is supplied to the filter tank from the fourth branch water channel, the air in the filter tank is exhausted from the backwash drainage channel, and the water supplied to the filter tank is almost the same as that of the filter tank. After being located near the upper end, the first three-way valve is switched so that the filter tank communicates with the first branch water channel, and the second three-way valve communicates with the second branch water channel and the fourth branch water channel. The method for filtering a bath is characterized in that the filtration is performed by supplying water from the upper part to the filtration tank by switching as described above.