JP2926739B2 - Bubble tub - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a bubble generating bathtub.

(B) Conventional technology Conventionally, a hot-water circulation path comprising a hot-water suction pipe and a hot-water bath is provided between a bathtub main body and a circulation pump installed outside the bathtub main body. There is an air bubble generating tub provided with an air intake section in the middle of the hot water supply pipe so as to blow out hot water mixed with air bubbles in the bath tub.

(C) Problems to be Solved by the Invention However, since the circulation pump is configured to rotate at a constant speed and the rotation speed cannot be changed, the injection pressure can be increased by increasing the injection amount of bath water from the injection nozzle. Therefore, it is not possible to freely adjust both the injection amount and the injection pressure, such that the injection pressure increases if the injection amount is reduced, so that the user's wishes cannot be satisfied.

(D) Means for Solving the Problems Therefore, in the present invention, a bath composed of a bath water suction passage and a bath hot water supply passage is provided between a bathtub body and a circulation pump installed outside the bathtub body. In the bubble generation bathtub, which has a hot water circulation flow path and an air intake section provided in the bath hot water strong flow path so that the bubble mixed bath water can be jetted into the bathtub main body, the favorable bath hot water strong flow A bubble detection bath provided with a pressure detection sensor in the path to control the rotation speed of the circulating pump and the opening of the valve for adjusting the ejection amount based on the detection value of the sensor. Is what you do.

(E) Example Hereinafter, the bubble generating bathtub according to the present invention will be described in detail with reference to the accompanying drawings.

First, the overall configuration of the bubble generating bath according to the present invention will be described.

(A) shown in FIG. 1 and FIG. 2 is a bubble generation bathtub according to the present invention. The bubble generation bathtub (A) includes a front and rear wall of a bathtub body (1) formed in a box shape having an upper surface opening. Foot side, back side, and ventral side jet nozzles on the left and right side walls (2) (2)
(3) (3) (4) (4) are provided in total of six.

The bathtub body (1) has a flange-shaped edge (1a) having a constant width at the periphery, and the air intake section (5) is formed at the edge (1a).
Are formed at substantially central portions of the left and right side walls, and have vertically elongated recesses (1b) and (1b) each having a substantially V-shaped cross section, and the recesses (1b) and (1b) on the side facing the rear wall (back side). The ventral ejection nozzles (4) and (4) are attached to the inclined surface (1'b) toward the center of the rear wall.

Further, a pump protection case (9) is provided outside the bubble generation bathtub (A). Inside the case (9), a circulation pump (P) for circulating bath water and a pump (P) are provided. Filter (43) for filtering the bath water circulated by P)
A pump driving motor (M) for driving the pump (P); a motor (M1) for driving the pump (P); ) And a control unit (C) for controlling the driving of the electric three-way valve (45).

Further, a bath water circulation path (D) is interposed between the circulation pump (P) and the bubble generation bath (A).

That is, the bath water circulation flow path (D) includes a bath water suction pipe (10) for sending bath water from the bubble generation bath tank (A) to the circulation pump (P), and the bath pump circulation pipe (P). It is composed of a hot water bath pipe (11) for sending hot water to (A).

And the bath water suction pipe (10) is the bathtub body (1)
One end is opened at the lower part of the tank, and the other end is connected to the water suction port of the circulation pump (P) so that the bath water is sucked into the circulation pump (P). (P)
One end is connected to the water outlet of the nozzle, and the jet nozzles (2) and (3)
The other ends are connected and connected to (4).

In FIG. 1, (7) is an outlet connected to a power source, (30b) is an infrared receiving sensor for receiving infrared rays transmitted from a remote controller (30) described later, and (30b).
c) is a reception indicator lamp provided in the infrared sensor.

Also, as shown in FIG. 3, the circulation pump (P)
A rotation speed detection sensor (6) for detecting the rotation speed of the circulation pump (P) is attached, and the detection result from the sensor (6) is
It is sent to a control unit (C) described later, and the control unit (C)
The number of rotations of the circulation pump (P) is controlled.

Further, as shown in FIG. 3, a pressure detection sensor (48) for detecting the pressure of the bath water pumped through the pipe (11) is attached to the middle part of the hot water bath pipe (11). Sensor (4
The detection result from 8) is input to a control unit (C), which will be described later, and the control unit (C) controls each ejection nozzle (2) (3)
(4) While detecting the pressure of the bath water spouted from
The water level in the bathtub body (1) is detected.

As shown in FIG. 4, the pressure detection sensor (48) has a diaphragm (48b) made of a semiconductor material stretched in a sensor case (48a), and one surface of the diaphragm (48b) is connected to a hot water supply pipe ( The diaphragm (48b) is distorted by receiving the pressure in the pipe (11) by communicating with the pipe (11).

The diaphragm (48b) is made of a semiconductor in which impurities are diffused, and as shown in FIG. 5, the diaphragm (48b)
Has a bridge (48d) composed of four strain gauges (48c) having different resistance values depending on strain.

Therefore, when a constant current is passed through the bridge (48d), the diaphragm (48b) is distorted due to pressure fluctuations, and when the resistance value of the strain gauge (48c) changes, the output voltage of the bridge (48d) changes. In other words, the pressure can be detected by calculating backward from this output voltage.

The output voltage is increased by connecting four strain gauges (48c) with a Wheatstone bridge.

In the figure, (48e) is a thick film resistor for temperature compensation built on the diaphragm (48b).

(48f) is a constant voltage circuit, (48g) is a voltage-current conversion circuit that allows a constant current to flow through the bridge (48d) using the constant voltage of the constant voltage circuit (48f), and (48h) is a bridge. (48d) is a differential amplifier for amplifying the output voltage at a constant amplification factor, and (48i) is an amplifier for adjusting the level with the control device (C) connected to the output terminal (48j).

The output of the pressure detection sensor (48) is AD-converted and input to the control unit (C) described later, whereby the pressure is detected in an extremely large number of stages (to a degree that can be regarded as a continuous amount in practical use). The water level in the bathtub body (1) and the discharge pressure of the circulation pump (P) are detected.

That is, when the circulation pump (P) is stopped, the pressure detected by the pressure detection sensor (48) indicates the head of the bath water level in the bathtub body (1), and the circulation pump (P) ) Is operating, the pressure detected by the pressure detection sensor (48) indicates the sum of the head at the water level and the discharge head of the circulation pump (P). Since the difference between the head and the head at the water level is extremely large, it can be regarded as a discharge head of the circulation pump (P) in practical use.

That is, the pressure detection sensor (48) is applied with the pressure obtained by adding the pressure due to the level of the bath water in the bathtub body (1) to the discharge pressure of the circulation pump (P). Rotation speed of P) and ejection nozzle (2) described later
(3) It is determined by the valve opening degree of (4), and since both are controlled by the control unit (C), the discharge determined as described above from the pressure detected by the pressure detection sensor (48). The pressure obtained by subtracting the pressure, that is, the head becomes the water level in the bathtub body (1).

That is, the pressure detection sensor (48) provided in the bath hot water flow path between the circulation pump and the bathtub body is connected to a strain gauge (48) made of a semiconductor material whose electric resistance changes according to the deformation amount.
Due to the configuration in c), the pressure can be detected to such an extent that it can be regarded as a continuous quantity in practical use. Therefore, the discharge pressure is subtracted from the pressure detected by the pressure detection sensor, and the bathtub body (1) It is possible to perform the operation of calculating the head of the bathwater inside, so that one pressure detection sensor can detect both the pressure of the bathwater jet and the bathwater level of the bathtub body. Become.

In addition, since the pressure detection sensor is non-contact, there are no problems such as contact corrosion, contact opening / closing hysteresis, and frictional resistance of the lever connection, which are inevitable with conventional switch type pressure sensors, and the life is long and accurate. In addition, stable pressure detection can be performed.

The jet nozzles (2), (3), and (4) use automatic variable jet nozzles that can change the jet amount and jet pressure of the bath water, respectively, and each jet nozzle (2), (3), (4). Have the same configuration, the foot-side jet nozzle (2) will be described as an example with reference to FIG.

The foot-side jet nozzle (2) fits into the cylindrical nozzle body (20) connected to the foot-side jet nozzle connection port (1g) of the bathtub body (1) and the front part inside the nozzle body (20). Valve body (21), a valve seat (21) formed at the rear of the valve seat forming cylinder (21), and an ejection amount adjusting valve body (22) coming into contact with and separating from the rear from the rear. Nozzle valve body drive motor (M1) for detachably supporting and reciprocating the adjustment valve element (22), and a throat which is swingably supported in front of the valve seat forming cylinder (21). (24).

The nozzle body (20) has a gasket (1
h) through a mounting screw (11), which is detachably fixed to the wall surface of the bathtub body (1). One end of the nozzle body (20) is connected to the air intake section (5). )
The other end of the intake pipe (12) connected to the
On the rear peripheral wall of the nozzle body (20),
1) is connected and connected.

A cylindrical decorative cover (26) having a front portion turned outward is fitted and attached to the front end edge of the nozzle body (20).

The valve seat forming cylinder (21) has a rear end face located in the vicinity of the high-feed pipe connecting portion (20c) inside the nozzle body (20).

In addition, a throat support surface (21c) having a substantially concave spherical surface is formed on the inner peripheral surface of the front portion of the valve seat forming cylinder (21), and the throat (24) having the outer peripheral surface of the base formed into a spherical shape can be swung. Has been fitted. (25) is a throat fixing member.

In the center of the rear end of the valve seat forming cylinder (21), a valve seat (21a)
The valve body (22) for adjusting the ejection amount is brought into contact with and separated from the valve seat (21a), and the opening / closing amount (the ejection amount) of the bath water flow passage (27) is controlled by the valve member (22) for adjusting the ejection amount. And adjust the ejection pressure).

The motor (M1) for driving the nozzle valve forward and backward is mounted on the rear wall (20g) of the nozzle body (20), and has a coil (23a) and a permanent magnet provided in the motor casing (23). The motor (M1) is configured to perform a stepping operation with the armature (23b). The rotation shaft of the motor (M1) is formed as a hollow shaft, and a ball screw (23c) is formed therein. ) Is converted into a linear motion in the axial direction, and the ejection amount adjusting valve element (22) is moved forward and backward through the valve element support rod (23d).

(23g) is a rotation restricting piece for preventing the valve body support rod (23d) from swaying with the ball screw (23c). (22e) is a peripheral edge of a rear end edge of the ejection amount adjusting valve body (22).
A bellows-shaped waterproof cover made of a synthetic resin material such as polytetrafluoroethylene or nylon 11 integrally formed with the valve body (22).

In addition, the motor (M1) for driving the nozzle valve
The magnet (2) attached to the rear end of the valve support rod (23d)
3j) and a valve element reference position detection sensor (23f) consisting of a Hall element (23i), and the magnetic flux passing through the Hall element (23i) that changes according to the advance / retreat operation of the valve element support rod (23d) Control unit (C) that converts the change in density into an electrical change
To detect the opening / closing amount of the ejection amount adjusting valve element (22).

 Next, the air intake section (5) will be described.

As shown in FIGS. 7 and 8, the air intake section (5)
Air inlet fitting (1f) at the edge (1a) of the bathtub body (1)
With a rectangular box-shaped air intake unit with a top opening (80)
The upper surface opening of the air intake unit body (80) is covered with a lid (82), and the air is introduced to the outside air through an air intake (82a) formed only outside the lid (82). It communicates with the inside of the air intake section main body (80).

An intake pipe connecting part (83) is provided at the center of the bottom surface of the air intake part body (80), and one end of each of the intake pipes (12) and (12) communicates with the front and rear walls of the connecting part (83). The air that has been connected and taken into the air intake unit body (80) is blown out through each intake pipe (12) (12) through each of the jet nozzles (2) (3)
(4).

In addition, inside the air intake unit body (80), a cylindrical sound absorbing material having a sound absorbing function and an air purifying function such as a plastic porous sintered body (for example, a polyethylene sintered body or a polypropylene sintered body) is provided. A plurality of formed silencers (92) are provided.

In the intake pipe connection part (83), there is provided a bubble amount control valve (87) for opening and closing a communication path (86) between the connection part (83) and the intake part body (80). Volume control valve (87)
Is the same as the cylindrical valve body (88) with its upper edge communicating with the bottom of the inlet section body (80) and the motor (M1) for driving the nozzle valve body reciprocating drive attached to the valve body (88). The valve body drive motor (M2) for adjusting the amount of air bubbles, the valve body support rod (89) attached to the motor (M2), and the tip of the rod (89) are attached to the valve body (88). And a main body (90) that can freely contact and separate from a valve seat (88b) formed at the upper end edge.

A valve position detection sensor (91) having the same configuration as the valve body reference position detection sensor (23f) is provided in the bubble amount adjustment valve body drive motor (M2).

In FIG. 7, (84) is a reactance type silencer,
(85) is a check valve for preventing bath water from flowing back into the intake pipe (12).

 Next, the circulation pump (P) will be described.

As shown in FIG. 9, the circulation pump (P) communicates the upper impeller chamber (33) and the lower impeller chamber (34) in the pump casing (32) via the interlocking flow path (32d). The lower impeller chamber (34) is provided with a bath water suction passage (32) provided on one lower side of the pump casing (32).
a) through the bath water suction pipe (10), and through the bath hot water supply path (32b) provided on the other side of the lower part of the pump casing (32), and the bath water strong transfer pipe (11). Then, the filter is communicated with one end of a suction pipe (41) of a filter (43) to be described later via a strong filtration path (32c) provided on one side of the upper impeller chamber (33). (32e) is the water intake,
(32f) indicates the lower outlet, (32g) indicates the upper outlet, (z1) indicates the circulating flow direction, and (z2) indicates the filtration flow direction.

Then, the impeller shaft (35) is suspended from the upper and lower impeller chambers (33) and (34) so as to penetrate the center vertically.
The upper impeller (33a) and the lower impeller (34a) are respectively mounted on the upper and lower impeller chambers (3) on the impeller shaft (35).
3) The impeller shaft (35) is coaxially mounted in (34), and the impeller shaft (35) is linked to the drive shaft (39) of the pump drive motor (M) which is mounted integrally and watertight on the pump casing (32). Has been established.

The pump driving motor (M) is a fully-closed external fan type induction motor controlled by an inverter, and has a drive shaft (39) provided with a rotation speed detection sensor (6) connected to the control unit (C).

(36) is a sealing material attached to the impeller shaft (35).

With this configuration, the upper and lower impellers (33a) (34a)
When the is rotated, the bath water is turned into the bath water suction pipe (10) → water inlet (32e) → bath water suction passage (32a) → lower impeller room (34)
→ Forced bathing water path (32b) → Lower spout (32f) → Forced feeding into bathtub body (1) via forcible bathing pipe (11).

As shown in FIG. 9, a filter (43) is connected to the upper impeller chamber (33) of the circulating pump (P) through a suction pipe (41) and a return pipe (42). ,
A part of the bath water sucked into the lower impeller chamber (34) is sent to the filter (43) through a suction pipe (41) connected to the upper water outlet (32g) of the upper impeller chamber (33). The bath water filtered by the filter (43) is sent through the return pipe (42) into the bath hot water supply pipe (11), and is sent from the lower water discharge port (32f) of the lower impeller chamber (34). 11) Merge with the bath water that is forcibly sent inside.

(39a) is an armature, (39b) is a field coil, and (39c) is a cooling fan.

 Next, the configuration of the filter will be described.

As shown in FIG. 10, the filter (43) has an acrylic mesh (43b) stretched in the lower portion inside the filter body (43a), and a granular filter material (43c) is placed on the mesh (43b). Place
The hot water can be filtered by passing the hot water through the filter medium (43c) downward from above the filter body (43a). (43d) is a baffle for preventing the upper surface of the particulate filter medium (43c) from being scoured at the time of filtering hot water, and for preventing the particulate filter medium (43c) from flowing out at the time of backwashing to be described later. It is.

At the upper end of the filter body (43a), a suction pipe (4
One end of (1) is connected and connected, the return end of the filter body (43a) is connected to one end of the pipe (42), and an electric three-way valve (45) is provided in the middle of the suction pipe (41). A drain pipe (46) is connected to one end of the electric three-way valve (45) so that the drawing pipe (41) and the drain pipe (46) can communicate with each other via the electric three-way valve (45).

When the electric three-way valve (45) is set so that the drain pipe (46) is closed and the suction pipe (41) is in circulation, a part of the bath water is supplied to the lower impeller of the circulating pump (P). Chamber (34) → communication channel (32d) → upper impeller chamber (33) → strong filtration path (32c) → upper spout (33a) →
The water is sent to the filter (43) via the suction pipe (41), filtered, passed through the return pipe (42), and is forcibly fed into the bathtub body (1) via the hot water supply pipe (11). Join the hot spring bath.

Further, when the electric three-way valve (45) is switched to close the upstream suction pipe (41) and to make the upstream suction pipe (41) communicate with the drain pipe (46),
Part of the bath water in the hot water supply pipe (11) is returned to the return pipe (4
2), the filter medium (43c) is passed upward through the filter medium (43c) from below to above the filter body (43a), so that the filter medium (43c) can be backwashed.

The switching operation of the electric three-way valve (45) can be performed by a remote controller (30) described later.

 Next, the control unit (C) will be described.

As shown in FIG. 3, the control unit (C) includes a microprocessor (MPU) and an input / output interface (50) (5).
1), a memory (52) including a ROM and a RAM, and a timer (53).

The input interface (50) detects the water pressure in the rotational speed detection sensor (6), the valve body reference position detection sensor (23f), the valve position detection sensor (91), and the hot water supply pipe (11). Pressure detection sensor (48), infrared receiving sensor (30
b) A bath temperature detecting sensor (T) for detecting the temperature of the bath water in the bathtub body (1) and a flow rate sensor (F) are connected.

The output interface (51) includes an inverter (I),
A motor for driving the nozzle valve advance / retreat (M1), a motor for driving the valve element for adjusting the amount of air bubbles (M2), and an electric three-way valve (45) are connected.

The memory (52) stores the motors (M) (M1) (M2) and the electric three-way valve (45) based on the output signals from the above-described sensors and the signals from the remote controller (30). A control program for controlling the driving unit is stored.

In particular, in controlling the rotation speed of the circulation pump (P), the frequency of the AC power supply (S) is converted by the inverter (I) controlled by the control unit (C) and supplied to the pump driving motor (M). It is done by doing.

Next, a remote controller (30) for mediating between the control unit (C) and the user will be described.

As shown in FIG. 11, the remote controller (30) includes an ON / OFF switch (60), a mild blow switch (61), a desired jet mode switch, a finger pressure blow switch (62), and a pulse blow switch (63). ), Massage blow switch (64) wave blow switch (6)
5) and air pulse blow switch (79), bubble amount increasing / decreasing switches (66) (67), bath water spouting intensity switch (68) (69), cycle increasing / decreasing switch (70) (7)
1) and a spray nozzle all use pattern switch (72), which is a switch for selecting a favorite spray nozzle use pattern,
Circulation use pattern switch (73), back side nozzle use pattern switch (74), foot side nozzle use pattern switch (75), and ventral side nozzle use pattern switch (76), and filter washing switch (77) And are arranged.

Then, by turning on the ON / OFF switch (60), the control unit (C) is started. First, the rotation speed of the circulation pump (P) and the valve opening of each injection nozzle are set to preset values. The operation of the bubble generation bath (A) starts in a controlled state.

Also, (78) is a power lamp, (60a) is an operation display lamp, (61a) (62a) (63a) (64a) (65a) (79a) are mode switch display lamps, and (66a) (67a) are air bubbles Amount setting lamps, (68a) and (69a) are bathwater jet intensity setting lamps,
(70a) and (71a) are bath water ejection cycle setting lamps, (72a) and (7
3a) (74a), (75a) and (76a) are discharge nozzle use pattern setting lamps, and (77a) is a filter cleaning switch display lamp.

Further, as shown in FIG. 11, the remote controller (30) includes an infrared signal transmitting section (30a) at a front end thereof, and a multi-frequency seat modulation system (MFT) set in advance by operating each switch.
M), an infrared signal modulated according to the operation of each switch is transmitted from the infrared signal transmitting unit (30a),
Infrared sensor (30b) installed in the bathroom
(Refer to FIG. 1), is sent to the input interface (50) of the control unit (C), and drives a desired driving device based on the control program read from the memory (52). I have.

In addition, the remote controller (30) is configured to be able to float on the surface of the bath so that a bather can operate in a bathing state.

In addition, infrared receiving sensor (30b) and air intake unit (5)
May be integrally formed.

With the above configuration, the air bubble generation bath (A) is controlled by the remote controller (30) operable on the surface of the bath water, through the control unit (C), the rotation speed of the circulation pump (P), and the ejection nozzles (2) ( 3) A valve body (22) for adjusting the ejection amount provided in (4)
The opening / closing amount and opening / closing speed of the valve, the opening / closing amount and opening / closing speed of the bubble amount control valve (5d) provided in the air intake section (5), and the switching operation of the electric three-way valve (45) can be performed. By adjusting the rotation speed of the pump (P), adjusting the opening and closing amount and opening / closing speed of the valve body (22) for adjusting the ejection amount, adjusting the opening and closing amount and opening / closing speed of the bubble amount adjusting valve (5d), and a combination thereof. , Six types of jet modes (mild blow, finger pressure blow, pulse blow, massage blow,
Wave blow and air pulse blow) can be set, and each jet mode can be set by turning on / off the favorite jet mode switches (61) to (65) provided on the remote controller (30).
It can be selected by the OFF operation.

In addition, for each mode, the bubble amount increase / decrease switches (66) and (67) and the bath water jet strong / weak side switch (68)
By turning ON / OFF the (69) and the cycle increase / decrease switches (70) and (71), respectively, it is possible to adjust the increase / decrease of the bubble amount, the strength of the spout bath, and the cycle of the spout bath. Can be adjusted.

Further, by turning on / off each of the changeover switches (72) to (76) to the favorite ejection nozzle use pattern, the use pattern of the six ejection nozzles to which the above-mentioned ejection mode is applied can be selected. I have to.

In the bubble generation bathtub (A), the optimum discharge pressure, bathwater injection amount, and bubble mixing amount are set according to the six types of jet modes, the intensity of bathwater ejection in each mode, and the cycle of jet switching. These are stored in the memory (52) of the control unit (C), and are stored in the remote controller (3).
The optimal discharge pressure of the jet mode selected in (0) is stored in memory (5
2), the rotation speed of the pump driving motor (M) of the circulation pump (P) is controlled via the inverter (I) using this value as a target value.

In the same manner as described above, the optimal bath water injection amount and the optimal bubble mixing amount in the selected jet mode are set as target values for driving the nozzle valve body for each of the injection nozzles (2), (3), (4). The motor (M1) and the motor (M2) for controlling the amount of air bubbles in the air intake section (5) are controlled.

When the filter washing switch (77) is turned ON, the electric three-way valve (45) is switched to operate, and the filter (4
3) Backwashing can be performed.

(F) Effect By providing a pressure detection sensor in the bath hot water flow path and controlling the rotation speed of the circulating pump and the opening of the valve for adjusting the ejection amount based on the detection value of the sensor, According to each jet mode selected by the user, and the strength of the bath jet and the cycle of the jet switching for each mode, the jet of the bath is controlled to the optimum discharge pressure without sacrificing the injection amount of the bath. It is possible to satisfy various requests of users.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bubble generating bathtub according to the present invention. FIG. 2 is a plan view of the bubble generating bathtub. FIG. 3 is an explanatory view of a conceptual configuration of the bubble generating bath. FIG. 4 is an explanatory sectional view of a pressure detection sensor. FIG. 5 is a block diagram showing a configuration of the sensor. FIG. 6 is an enlarged sectional view of an ejection nozzle. FIG. 7 is an enlarged sectional view of an air intake section. FIG. 8 is a piping diagram of an intake pipe. FIG. 9 is a partially cutaway front view of a pump driving motor and a circulation pump. FIG. 10 is a sectional view of a filter. FIG. 11 is a plan view of a remote controller. (A): Bubble generation bath (P): Circulation pump (C): Control unit (D): Bath water circulation flow path (1): Bathtub body (2): Foot side jet nozzle (3): Back side jet nozzle (4): Ventral jet nozzle (10): Bath hot water suction pipe (11): Bath hot water pipe (43): Filter (48): Pressure detection sensor

Continuation of the front page (72) Inventor Mitsuaki Hashida 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Tochiki Kiki Co., Ltd. Chigasaki Plant (72) Inventor Koichi Uchiyama 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Toto (72) Inventor Kenji Moriyama 2-7-1, Motomura, Chigasaki-shi, Kanagawa Prefecture Tochiki Equipment Co., Ltd. Chigasaki Factory (56) References JP-A-61-293462 (JP, A) Sho 63-3681 (JP, A) Shokai Sho 57-42828 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61K 23/00

Claims (1)

(57) [Claims] A bath water circulation flow path comprising a bath water suction flow path and a hot water supply path is provided between a bathtub body and a circulation pump provided outside the bathtub body. An air intake section is provided in the hot water supply channel, and a bubble detection bath configured to be able to jet a bath containing air bubbles into the bathtub body. A bubble generating bath tub configured to control the rotation speed of the circulating pump and the opening degree of the valve for adjusting the ejection amount based on the detected value of the circulating pump.