JPH0560971B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention purifies a portion of the bathtub water taken out from the bathtub through filtration and mixes it with air to produce bathtub water as a jet stream for foamy pine surge. The present invention relates to a bathtub system configured to not only eject and circulate water but also wash a filtering means with water within the bathtub.

<Prior Art> As this type of bathtub system, the present applicant is considering, for example, the one shown in FIG. 4.

As shown in the figure, the bathtub 1 is provided with a suction port 2 on one side wall 1a of the opposing side walls 1a and 1b, and a suction port ₂ for guiding water inside the bathtub to the outside. Two walls are provided on each of the walls 1a and 1b for mixing air and bathtub return water (the supply system for these will be described later) and jetting jet flows Ja and Jb for foamy pine surge into the bathtub water _W0 . Jet nozzles 3a and 3b are provided.

Individual air supply pipes 5a, 5b are connected to each jet nozzle 3a, 3b, and each air supply pipe 5
A common air control valve 6 is interposed between a and 5b. The suction port 2 and the suction side of the circulation pump 8 are connected via an upstream circulation pipe 7c, and the discharge side of the circulation pump 8 and each jet nozzle 3a, 3b are connected via downstream circulation pipes 7a, 7b, respectively. The circulation pipe 7 is constituted by the upstream circulation pipe 7c and the downstream circulation pipes 7a and 7b. Return water control valves 9a and 9b are interposed in each of the downstream circulation pipes 7a and 7b, respectively.

A steam/water separation tank 1 is connected to a branch pipe 10 from a branch part 7d of the circulation pipe 7 on the downstream side of the circulation pump 8.
1 is connected to the piping 12 and the first three-way valve 1 is connected to one transparent outlet of the steam/water separation tank 11.
3 and a forward inflow side 15a of the filtration tank 15 are connected via piping 14. The forward outflow side 15b of the filtration tank 15 is connected to the upstream circulation piping 7c between the suction port 2 and the circulation pump 8 in the circulation piping 7 via the piping 16, the second three-way valve 17, and the confluence piping 18. It is connected to the confluence section 7e. A drain pipe 19 is connected to the first three-way valve 13, and the second three-way valve 17 and the outlet on the steam separation side of the steam separation tank 11 are connected via a pipe 20.

A plurality of air blow nozzles 21 are provided on the bottom wall 1c of the bathtub 1, and these air blow nozzles 21 are connected to an air pump 24 for air blowing via a header 22 and an air blow pipe 23, and an air blow control valve 25 is interposed in the air blow pipe 23. has been done.

The remote control operation unit 26 includes an operation switch S ₁ , a jet switch S ₂ , a backwash switch S ₃ , an air blow switch S ₄ , an up-down key S ₅ for adjusting the amount of jet water, and an up-down key for adjusting the amount of jet foam.
_S6 , an up-down key _S7 for adjusting the amount of air blow bubbles, and a liquid crystal display panel 27 are provided.

The sequence controller 28 controls the air control valve 6, circulation pump 8, return water control valves 9a, 9b, first and second three-way valves 13, 17, and air blowing air pump based on various commands from the remote control operation unit 26. 24 and the air blow control valve 25, corresponding elements are sequentially controlled. The two-dot chain line indicates those control systems.

In this bathtub system, the backwash mode is performed intermittently while the jet mode is being executed, since the backwash mode can be operated independently to save time and effort.

The operation will be explained below. However, the explanation of the air blow mode is omitted here as it is not important.

Pressing the run switch _S1 activates the sequence controller 28.

Jet Mode When the jet switch _S2 is pressed, the jet mode is selected, and the sequence controller 28 opens the air control valve 6 and both return water control valves 9a and 9b. The opening amount of the air control valve 6 is set by the up-down key _S6 for adjusting the amount of jet foam, and the opening amount of the return water control valves 9a and 9b is set by the up-down key _S5 for adjusting the amount of jet water. is set.
Furthermore, based on the push operation of the jet switch _S2 , the sequence controller 28 causes the first three-way valve 13 to communicate with the pipes 12 and 14, and also causes the second three-way valve 17 to communicate with the pipes 16 and the merging pipe 18. Make it into a communicating pore state. Next, the sequence controller 28 drives the circulation pump 8.

This causes the bathtub water to flow as shown by the solid arrow. In other words, the water in the bathtub W ₀ is circulated by the circulation pump 8
The suction force causes the upstream circulation piping 7 to flow from the suction port 2.
The bathtub water is sucked into the circulation pump 8 and reaches the branch 7d, where it is connected to the downstream circulation piping 7a,
The water is divided into the 7b side and the branch pipe 10 side.

Some of the bath water diverted to the branch pipe 10 side is
After passing through the steam/water separation tank 11 via the piping 10, the dirt contained in the bath water reaches the forward inflow side 15a of the filtration tank 15 via the piping 12, the first three-way valve 13, and the piping 14. removed. The clean water that has passed through the filtration tank 15 reaches the confluence section 7e from the forward outflow side 15b via the pipe 16, the second three-way valve 17, and the confluence pipe 18, and at this confluence section 7e, the bath water from the suction port 2 is collected. and then reaches the circulation pump 8 again.

This combined water reaches both jet nozzles 3a, 3b from the branch part 7d via the downstream circulation pipes 7a, 7b and the return water control valves 9a, 9b, where it passes through the air supply pipes 5a, 5b and the air control valve 6. It is mixed with the air supplied through the bathtub and is ejected into the water _W0 in the bathtub as jet flows Ja and Jb for foamy pine surge.

For example, the duration of operation in the jet mode is 15 minutes, but if the same operation continues for 5 minutes, the filter tank 15 is automatically backwashed. That is, when the built-in timer counts 5 minutes, the sequence controller 28a temporarily interrupts the jet mode, puts the first three-way valve 13 in communication with the piping 14 and the drain pipe 19, and also opens the second three-way valve 17. The piping 20,
16 to communicate with each other, and the filtration tank 15
backwash. During this backwashing, the bathtub water flows as indicated by the broken line arrow, removes dirt accumulated in the filtration tank 15, regenerates the filtration tank 15, and drains the bathtub water containing dirt through the drain pipe 19.

Even during such backwashing, the air control valve 6 and the return water control valves 9a and 9b are kept open so that the bathers can receive the jet streams Ja and Jb.

Note that this backwashing operation is explained in detail in the following backwashing mode operation.

This backwashing is carried out for one minute, and when it is finished, the jet mode is returned to.

As described above, while a part of the bath water taken out from the bathtub 1 is purified by filtration, it is mixed with air to form a jet flow Ja for foamy pine surge.
Jb is jetted back into the bathtub water _W0 , and the filter tank 15 is backwashed at regular intervals. Note that if the jet switch _S2 is pressed again, the circulation pump 8 will stop. Even if you do not press it, the circulation pump 8 will automatically stop when the jet mode operation has exceeded the continuous operation time (15 minutes).

Backwash mode In this mode, backwash is performed by manual operation. When the backwash switch S ₃ is pressed, the backwash mode is selected, and the sequence controller 28 fully closes the air control valve 6 and puts the first three-way valve 13 into communication between the pipe 14 and the drain pipe 19. After the second three-way valve 17 is brought into communication between the pipes 20 and 16, the circulation pump 8 is driven.

As a result, the bathtub water flows as shown by the dashed arrow. In other words, the water in the bathtub W ₀ is circulated by the circulation pump 8
The bathtub water is sucked from the suction port 2 into the upstream circulation piping 7c, and the bath water is transferred from the circulation pump 8 to the branch section 7.
d. After the air bubbles contained in the bathtub water are removed from the air-water separation tank 11 via the branch pipe 10, the water is transferred to the filtration tank 15 via the pipe 20, the second three-way valve 17, and the pipe 16. The water flows in the opposite direction, removes the dirt accumulated in the filter tank 15, regenerates the filter tank 15, and removes the bath water containing dirt through the pipe 14, the first three-way valve 13, and the drain pipe 19. . Some of the bath water is jetted out from jet nozzles 3a and 3b.

Note that when the backwash switch _S3 is pressed again, the circulation pump 8 is stopped. Even if you do not press it, the circulation pump 8 will automatically stop when the operation continuation time (15 minutes) in the backwash mode has elapsed.

Backwash mode during jet mode operation When backwash switch S ₃ is pressed during jet mode operation, backwash mode is selected and filtration tank 1 is
5 and returns to the original jet mode after a predetermined time (1 minute) has elapsed.

However, in this interruptive backwash mode during jet mode operation, the bather can
Air control valve 6 so that Jb can be pumped
a, 6b and return water control valves 9a, 9b are left open.

<Problems to be Solved by the Invention> In the above-mentioned bathtub system, intermittent backwash operation that is automatically performed during the execution of the jet mode, or interruption by manual operation of the backwash switch _S3 during the execution of the jet mode During regular backwash operation, bath water mixed with air bubbles due to jet flows Ja and Jb is taken out from the suction port 2, so a water separation tank 11 is interposed between the circulation pump 8 and the filtration tank 15. The need arose.

If the air-water separation tank 11 is not interposed, the air bubbles mixed in the backwash water will lift the beads (not shown) that are the filtration material filled in the filtration tank 15. Beads are drain pipe 19
leaks to the outside. In order to prevent this, a steam/water separation tank 11 was required to remove air bubbles from the backwash water.

However, the presence of the steam/water separation tank 11 increases the size and cost of the bathtub system.

The present invention was devised in view of these circumstances, and aims to prevent beads from flowing out from the filtration tank during backwashing, while eliminating the need for a steam/water separation tank.

<Means for Solving the Problems> In order to achieve such objects, the present invention has the following features:
A first system comprising a bathtub and a bathtub water circulation means, which circulates the bathtub water taken out from the bathtub and returns it to the bathtub.
a piping path, an air supply means for mixing air into the water in the bathtub returned to the bathtub in the first piping path; It includes a switching means and a drainage means, and when the switching direction of the switching means is the first direction, the bath water introduced from the first piping path is passed through the passing means in the forward direction to drain the water into the first pipe. and a second piping path which leads the water out to the piping path again, and in the case of the second direction, allows the water to pass through the passage means in the opposite direction and drain water from the drainage means, and the bathtub water circulation means and the air supply means are connected to each other. operates, and
With the switching direction of the switching means set as a first direction, a jet mode is executed in which water in the bathtub introduced from the first piping path to the second piping path and passed through the passing means is returned to the bathtub in a state in which air is mixed therein. The bathtub system has a first control means that operates the bathtub water circulation means while the air supply means is stopped after the jet mode ends, and also controls the switching direction of the flow path switching means to a second direction. and a second control means for executing a backwash mode in which water in the bathtub introduced from the first piping path to the second piping path and passed through the passing means in the opposite direction is drained from the drainage means. It is characterized by

<Operation> According to the above configuration, the backwash mode that is performed after the end of the jet mode is performed while the air supply means is stopped, so that no air bubbles are mixed into the backwash water for the overflow means. This prevents the beads in the filtering means from flowing out of the drain pipe due to the backwash water.

In the present invention, especially when the jet mode ends, the backwash mode is automatically executed for a predetermined period of time, so there is no need to take the trouble to perform an operation to execute the backwash mode.

In this way, when running the backwash mode, be sure to avoid generating a foamy jet flow to the water in the bathtub, so that the water in the bathtub does not contain air bubbles. Even if not used, the outflow of beads within the filter means will be avoided.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic diagram of a bathtub system according to an embodiment of the present invention.

In the figure, 1 is a bathtub, 1a and 1b are opposing side walls of the bathtub 1, 1c is a bottom wall, 2 is a suction port, and 3
a and 3b are jet nozzles, 5a and 5b are air supply pipes, 6 is an air control valve, 7 is a circulation pipe as a first pipe path, 7a and 7b are downstream circulation pipes, 7
c is an upstream circulation pipe, 7d is a branch part, 7e is a confluence part, 8 is a circulation pump as bathtub water circulation means, 9
a, 9b are return water control valves, 10 is a branch pipe, 13
1 is a first three-way valve as a flow path switching means, 15 is a tank as a flow path switching means, 17 is a second three-way valve as a flow path switching means, 18 is a merging pipe, 19 is a drain pipe as a drainage means, 21 is an air blow nozzle,
22 is a header, 23 is an air blow pipe, 24 is an air pump for air blow, 25 is an air blow control valve, 26a is a remote control operation unit, 27a is a liquid crystal display panel, 28a is a sequence controller, Ja,
Jb is the jet flow, and _W0 is the water in the bathtub. These configurations are the same as those of the conventional example explained in FIG. 4 except for the remote control operation section 26a and the sequence controller 28a, so the same reference numerals are given here and the explanation will be omitted. The air supply pipes 5a, 5b and the air control valve 6 correspond to the air supply means set forth in the claims, and the sequence controller 28a corresponds to the first and second air supply means set forth in the claims.
This corresponds to the control means. Further, the branch pipe 10, the pipe 12a, the pipe 14, the pipe 16, and the confluence pipe 18 constitute a second pipe path.

The configurations of this embodiment that differ from the conventional example are as follows.

That is, the steam/water separation tank 11, which was essential in the conventional example, has been abolished, and a pipe is installed between the branch pipe 10 and the confluence pipe 18 so that the circulation pump 8 is connected in parallel to the circulation pipe 7. A backwashing bypass pipe 20a is provided, and a pipe 12a (discharge side of the circulation pump 8) extending from the connection point 10a between the branch pipe 10 and the backwashing bypass pipe 20a and the filtration tank 1
Piping 14 and drain pipe 19 on the forward inflow side 15a of No. 5
A first three-way valve 13 is interposed between the filter tank 1 and
5, the forward direction outflow side 15b piping 16 and the confluence piping 1
8 (the suction side of the circulation pump 8) and the backwashing bypass pipe 20a, a second three-way valve 17 is interposed, and the filtration tank 15 is connected in parallel to the backwashing bypass pipe 20a. The filter tank 15 is filled with beads 15c.

The remote control operation section 26a includes a liquid crystal display panel 27.
a, an operation key K ₁ , an air blow key K ₂ , a jet key K ₃ , an air blow foam volume switching key K ₄ , a jet water volume switching key K ₅ , a jet foam volume switching key K ₆ and a backwash key K ₇ It is equipped with

The air blow foam volume switching key _K4 , the jet water volume switching key _K5 , and the jet foam volume switching key _K6 are used to switch the foam volume or water volume into three levels. Switching between these three stages or three states is performed by up-counting and resetting a 2-bit counter in the sequence controller 28a. For example, if you press the jet water volume switch key K ₅ once, the count value will switch from the initial value [0, 0] to [0, 1] and the high water volume mode will be selected, and if you press it twice, the count value will change to [1]. , 0] and the medium water mode is selected.
When pressed three times, the counter is reset to the initial value [0,0] and the low water flow mode is selected.

The sequence controller 28a controls the air control valve 6, the circulation pump 8, the reflux water control valves 9a and 9b, and the first and second three-way valves 13 based on the operations of various keys _K1 to _K7 on the remote control operation section 26a. ,1
7. Corresponding elements of the air pump 24 for air blowing and the air blow control valve 25 are sequentially controlled.

The operation will be explained below.

Pressing the run key _K1 activates the sequence controller 28a.

[1] Jet mode When the jet key _K3 is pressed, the jet mode is selected, and the sequence controller 28a opens the air control valve 6 and both return water control valves 9a and 9b. The opening amount of the air control valve 6 can be switched to three levels depending on the number of times the jet foam amount switching key _K6 is pressed, and the opening amount of the reflux water control valves 9a and 9b can be changed by pressing the jet water amount switching key _K5 . It can be switched to three stages depending on the number of times.

Next, the sequence controller 28a brings the first three-way valve 13 into communication between the pipes 12a and 14, and connects the second three-way valve 17 to the pipe 1.
6. After the merging pipes 18 are connected to each other, the circulation pump 8 is driven.

Then, as shown by the solid arrow, the water in the bathtub W ₀
is sucked into the upstream circulation pipe 7c from the suction port 2 by the suction force of the circulation pump 8, and the bath water reaches the branch part 7d from the circulation pump 8, where it is connected to the downstream circulation pipes 7a, 7b and the branch pipe 10 side. It is divided into

Some of the bath water diverted to the branch pipe 10 side is
From the forward inflow side 15a of the filtration tank 15 to the filtration tank 1 via the pipe 12a, the first three-way valve 13, and the pipe 14
5, the dirt contained in the bathtub water flows through the filter tank 15 in the forward direction and becomes beads 15c.
removed by group. The clean water that has passed through the filtration tank 15 reaches the confluence section 7e from the forward outflow side 15b via the pipe 16, the second three-way valve 17, and the confluence pipe 18, and at this confluence section 7e, the bath water from the suction port 2 is collected. and then reaches the circulation pump 8 again.

The bathtub water in which the bathtub water from the suction port 2 and the clean water are combined flows through downstream circulation piping 7a, 7b,
It reaches both jet nozzles 3a, 3b via the return water control valves 9a, 9b, where it is mixed with the air supplied via the air supply pipes 5a, 5b and the air control valve 6, and the water in the bathtub W ₀ It is ejected as jet streams Ja and Jb for foamy pine surge.

The duration of operation in jet mode is 15 minutes,
During this continuous operation time, intermittent backwashing of the filtration tank 15 as in the conventional example is not performed. The filtration tank 15 is backwashed after the continuous operation time has ended, or
After pressing the jet key K ₃ again to stop jet mode operation.

The sequence controller 28a uses a built-in timer to count the operating time during the jet mode operation, and when it detects the end or stop of the jet mode operation, it stores the operating time T _D up to that point. Then, the backwash time T _REV is calculated by dividing the operating time T _D by 5 (T _REV = T _D /5).
For example, if the operating time T _D is 10 minutes, the backwash time
T _REV is 2 minutes, and when operating time T _D is 5 minutes, backwash time T _REV is 1 minute.

As shown in the time chart of FIG. 2, the sequence controller 28a closes the first three-way valve 13 between the pipe 14 and the drain pipe 19 on the forward inflow side 15a of the filtration tank 15 when the jet mode operation ends or stops. and the second
The three-way valve 17 is switched to a state where the backwashing bypass piping 20a and the piping 16 on the forward outflow side 15b are in communication with each other, and the air control valve 6 is fully closed.

Then, part of the bath water from the circulation pump 8 flows out of the filtration tank 15 in the forward direction through the branch pipe 10, the backwash bypass pipe 20a, the second three-way valve 17, and the pipe 16, as shown by the broken line arrow. It flows in the reverse direction through the filtration tank 15 from the side 15b toward the forward inflow side 15a, backwashes the filtration tank 15, washes away the dirt blocked by the beads 15c in the filtration tank 15, and drains the pipe 1.
4. Discharge to the outside via the first three-way valve 13 and the drain pipe 19.

In this case, the air control valve 6 is fully closed, and the jet flow Ja, which contains air _bubbles , is
Since Jb does not exist, the backwash water sent from the circulation pump 8 to the filtration tank 15 does not contain air bubbles, and therefore the beads 15c in the filtration tank 15
is prevented from flowing out by backwash water. That is, even if the air-water separation tank 11 is abolished, the filtration tank 15
This makes it possible to prevent the beads 15c from flowing out.

As shown in Figure 2, the jet mode operation is
If the jet mode operation is stopped by pressing the jet key K ₃ again (T _D1 = 10 min), backwashing will be performed for 2 minutes (T _REV1 = 2 min). and,
Press the jet key K ₃ again to restart the jet mode operation, and after 5 minutes press the jet key K ₃ again to stop (T _D2 = 5 min), backwashing will be performed for 1 minute (T _REV2 = 1 min). If the jet mode is operated for the continuous operation time (15 minutes), the operation will be automatically stopped (T _D3 =
15min), in this case, backwashing is performed for 3 minutes (T _REV3 = 3min).

In other words, since the degree of contamination in the filter tank 15 is proportional to the operating time T _D in jet mode, by backwashing for a time T _REV proportional to the degree of contamination, contamination can be rationally removed and the filter tank 15 can be regenerated. That's what I'm doing. Since backwashing of the filtration tank 15 is performed each time the jet mode operation is finished or stopped, the filtration tank 15 can always be kept in a clean state.

Note that during backwashing in the above jet mode, the return water control valves 9a and 9b are on the open side, so some of the bathtub water flows from the jet nozzles 3a and 3b to the bathtub water.
Reflux to W ₀ .

By the way, when operating in jet mode rather than during backwashing, one of the air control valves 6 is fully closed, and both return water control valves 9a and 9b are closed.
By fully closing the corresponding one, the jet flow Ja or Jb can be ejected from only one jet nozzle 3a or 3b.

Note that during backwashing following the end of jet mode operation, the flow rate of backwash water to the filtration tank 15 may be increased by fully closing or throttling both return water control valves 9a and 9b to improve backwash efficiency. good.

[2] Air blow mode Press the air blow key _K2 to select the air blow mode, and the sequence controller 28a will
Open the air blow control valve 25. The opening amount of the air blow control valve 25 can be determined using the air blow foam amount switching key.
You can switch between three levels depending on the number of times you press _K4 . In this case, sequence controller 2
The control performed by 8a is the same as that in the conventional example, so the explanation will be omitted. The operation duration of air blow mode is
It's 15 minutes.

Note that the jet mode and air blow mode can be executed simultaneously.

[3] Backwash mode during jet mode operation As shown in the time chart in Figure 3, if you manually press the backwash key K ₇ during jet mode operation, the jet mode will be interrupted and the backwash mode will be activated as an interrupt. , the sequence controller 28a switches the air control valve 6 to the backwash key.
Fully close at the same time as K ₇ .

Then, wait for the time t ₀ (5 seconds) required for the air bubbles in the water W ₀ in the bathtub to disappear. When the time t ₀ has elapsed, the sequence controller 28a closes the first three-way valve 13 to the forward inflow side 15 of the filtration tank 15.
The pipe 14 of a and the drain pipe 19 are connected to each other, and the second three-way valve 17 is connected to the backwashing bypass pipe 20.
a and the piping 16 on the forward outflow side 15b of the filtration tank 15
At the same time, both return water control valves 9a and 9b are fully closed. After this, backwash time
Backwash for T _REV0 (1 minute).

The flow of backwash water is the same as described above, and the flow of the backwash water is the same as that described above.
is regenerated by backwashing, and the bathtub water containing dirt is discharged to the outside via a drain pipe 19. In this case as well, the jet flow Ja, Jb containing air bubbles with respect to the water W ₀ in the bathtub
Since no air bubbles are present in the backwash water, the beads 15c in the filtration tank 15 are prevented from flowing out by the backwash water. Therefore, the steam/water separation tank 11 can be abolished.

When the backwashing for the above-mentioned backwashing time T _REV0 (1 minute) is completed, the sequence controller 28a returns the first three-way valve 13 and the second three-way valve 17 to their original states, and also closes both the air control valves 6a, 6b and both return water control valves 9a and 9b are opened to return to the original jet mode.

During backwashing during jet mode operation, both return water control valves 9a and 9b are fully closed.
Since all of the bath water from the circulation pump 8 is used as backwash water to backwash the filter tank 15, the efficiency of backwashing is high. However, if you are not particular about backwashing efficiency, both return water control valves 9a and 9b
may be the open side.

In this case, backwashing is left to the manual operation of the user, so if backwashing is not performed for a long time, there is a risk that the filter tank 15 will become contaminated beyond its limit. Therefore, for example, if the cumulative value of the flow rate flowing into the filtration tank 15 is counted, and when the count reaches a certain value, a display prompting backwashing is displayed on the liquid crystal display panel 27, the filtration tank 1
5 can be prevented from clogging.

<Effects of the Invention> As explained above, according to the present invention, after the end of the jet mode operation, the air supply means is automatically deactivated and the backwash mode is performed. To prevent air bubbles from being mixed into the backwash water for the filtration tank and to prevent beads in the filtration tank from flowing out from the drain pipe due to the backwash water, unlike the conventional example where the mode is performed intermittently. I can do it.

In this way, it is possible to eliminate the conventionally indispensable steam/water separation tank while saving the user's operation effort, and it is possible to achieve downsizing and cost reduction of the bathtub system.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a bathtub system according to the present invention, FIG. 2 is a time chart for explaining the first operation, and FIG. 3 is a time chart for explaining the second operation. Moreover, FIG. 4 is a schematic configuration diagram of a bathtub system according to a conventional example. 1... Bathtub, 5a, 5b... Air supply piping, 6
...Air control valve, 15...Filtration tank, 15a...Forward inflow side of the filtration tank, 15b...Forward outflow side of the filtration tank, 28a...Sequence controller.

Claims (1)

[Scope of Claims] 1: a bathtub; a first piping path comprising bathtub water circulation means, in which water taken out from the bathtub is circulated and returned to the bathtub; and the water is returned to the bathtub in the first piping path. an air supply means for mixing air into the water in the bathtub; and an air supply means connected to the first piping path, and comprising a passage means, a flow path switching means, and a drainage means, If the switching direction of the switching means is the first direction, the introduced bath water passes through the passing means in the forward direction and is led out again to the first piping path, and if the switching direction is the second direction, the introduced bath water is a second piping path for passing water through the bathtub water circulation means in the opposite direction and discharging water from the drainage means, the tub water circulation means and the air supply means being actuated, and the switching direction of the switching means being set in the first direction;
A bathtub device comprising a first control means for executing a jet mode in which water in the bathtub introduced from the first piping path to the second piping path and passed through the passing means is returned to the bathtub in a state in which air is mixed therein. After the jet mode ends, with the air supply means in a stopped state, the bathtub water circulation means is operated, and the flow path switching means is switched in a second direction, so that the air flow from the first piping path to the A bathtub device comprising: a second control means for executing a backwash mode in which water in the bathtub that has been introduced into a second piping path and passed through the drainage means in the opposite direction is drained from the drainage means.