JPH031864A - Freezing preventing apparatus of filter in bubble generating bathtub - Google Patents

Abstract

PURPOSE:To prevent the freezing of the bath hot water in a filter by a method wherein a recirculation pump is automatically operated at a low rotational speed when it is sensed that the temp. of bath hot water reaches definite low temp. to recirculate bath hot water to the filter. CONSTITUTION:When the temp. of bath hot water is within a range of 0 -5 deg.C and the water level in a bathtub main body 1 detected by a pressure detecting sensor 48 is higher than the suction port of a bath hot water suction pipe, low frequency AC output is outputted to a pump driving motor M from an inverter I and a recirculation pump P is rotated at a low speed to fluidize the bath hot water in a filter main body 43 and the bathtub main body 1 is heated by the remaining heat of the bath hot water in the bathtub main body 1 to prevent freezing. In order to operate the recirculation pump P at a low rotational speed for the sake of the prevention of freezing, the pressure detecting sensor 48 as a water level detecting means, a detection sensor T as a bath hot water temp. detecting means or a recirculation pump peripheral temp. detecting means is used as a required means.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an antifreeze device for a filtration device in a bubble generating bathtub.

(b) Conventional technology In the past, a bath water circulation flow path consisting of a bath water suction pipe and a bath water bullet delivery pipe was interposed between the bathtub body and a circulation pump installed outside the bathtub body. In a bubble-generating bathtub in which an air intake part is provided in the middle of a hot water supply pipe to spray bubble-mixed bathwater into the bathtub, a filter is connected to the bathwater circulation flow path to purify the bathwater. There is something that has been
Those designed for cold regions are equipped with a heater around the outer periphery of the filter, and in cold weather the heater is energized to prevent the bath water in the filter from freezing.

(c) Problems to be solved by the invention However, if the filter is located away from the bathtub body and outdoors, even if the filter itself can be prevented from freezing, the piping leading to the bathtub body may freeze. Because this was not possible, the bath water in the pipes froze, causing problems such as the vibrator bursting.

(d) Means for Solving the Problem Therefore, in the present invention, a bathtub consisting of a bath water suction channel and a bath water forced flow channel is provided between the bathtub body and a circulation pump installed outside the bathtub body. A hot water circulation flow path is provided, a jet nozzle is provided at the discharge portion of the forced bath water flow path into the bathtub body, and the jet nozzle is configured to be able to jet the bath water mixed with air bubbles into the bathtub main body, In the bubble-generating bathtub configured to communicate the circulation pump with a filter to filter the bathwater flowing through the bathwater circulation flow path, a required detection means detects when the temperature of the bathwater has reached a certain low temperature. A freezing prevention device for a filtration device in a bubble-generating bathtub configured to prevent bathwater from freezing in a filtration device by automatically operating a circulation pump at a low speed to circulate bathwater to a filtration device when detected. We aim to provide the following.

(e) Examples The bubble-generating bathtub according to the present invention will be explained in detail below with reference to the accompanying drawings.

First, the overall structure of the bubble-generating bathtub according to the present invention will be explained.

(A) shown in FIGS. 1 and 2 is a bubble-generating bathtub according to the present invention, and the bubble-generating bathtub (A) includes front and rear walls of a bathtub body (1) formed in a box shape with an opening at the top; On the left and right side walls,
Feet side, dorsal side, and ventral side jet nozzles (2) (2) (3) respectively.
)(3)(4) There are a total of six (4).

The bathtub body (1) has a flange-like edge (1a) of a constant width formed on the periphery, and an air intake portion (5) on the edge (1a).
), and four vertically elongated parts (Lb) (lb) in a crosswise V-shape are formed approximately in the center of the left and right side walls, and the same recessed parts (lb) (
1b) Sloped surface (1'l) on the side facing the rear wall (dorsal side)
The ventral side jet nozzle (4) (4) is attached toward the center of the rear wall.

In addition, a pump protective case (9) is arranged outside the bubble generating bath ffl (A), and inside the case (9) there is a circulation pump (P) that circulates the bath water, and a pump that circulates the bath water. A filter (43) that filters the bath water circulated by (P)
, a pump drive motor (M) that drives the same pump (P), the same motor (M), a motor (old) for driving the valve body for the nozzle (described later), a motor for driving the valve body for the air bubble ffi, and the M section ( M2) and a control unit (C) that controls the driving of the electric three-way valve (45).

Moreover, a bath water circulation channel (D) is interposed between the circulation pump (P) and the bubble generating bathtub (A).

That is, the bath water circulation flow path (D) is a bubble generating bath te (A
) to the circulation pump (P), and a bath water suction vibe (10) for sending bath water from the circulation pump (P) to the bath Ia (
It consists of a bath water bullet delivery pipe (11) for sending bath water to the bath water.

The bath suction vibrator (10) is connected to the bathtub body (1).
One end is opened at the bottom of the circulation pump (P), and the other end is communicated with the water intake port of the circulation pump (P) so that bath water is sucked into the circulation pump (P). (P
), one end of which communicates with the spout of the spout nozzle (2) (
3) The other end is connected to (4) for communication.

In addition, in Figure 1, (7) is the outlet connected to the power supply,
(30b) is an infrared receiving sensor that receives infrared rays emitted from a remote controller (30), which will be described later;
0c) is the reception indicator lamp installed on the same infrared reception sensor,
(30d) is an abnormal lamp.

In addition, as shown in Figure 3, the circulation pump (P) is equipped with a rotation speed detection sensor (6) that detects the rotation speed of the circulation pump (P), and the detection results from the sensor (6) are , to a control section (C) to be described later, and the control section (C) sets the rotation speed of the circulation pump (P) to fi! I? I try to do Xi.

In addition, a pressure detection sensor (48) is installed in the middle of the bath water pumping pipe (11) to detect the pressure of the bath water being pumped through the pipe (11), as shown in Fig. 3. The detection results from the sensor (48) are input to the control section (C), which will be described later, and the control section (C) controls each jet nozzle (2) (
3) In addition to detecting the pressure of the bath water spouted from (4), the water level in the main body (1) of bath a) is also detected.

As shown in FIG. 4, the pressure detection sensor (48) has a diaphragm (48b) stretched in a sensor case (48a), and the negative side of the diaphragm (48b) is attached to the hot water bomb feeding vibe (11). The pressure inside the vibrator (11) is communicated with the other side, and the plunger (48c) is connected to the other side, and the suppressor (48c) is connected to the other side.
48d), the displacement of the diaphragm (48b) is transmitted to the pressurized conductive rubber (48o).

Note that the suppressor (48d) is biased by a spring (48f), and therefore the diaphragm (48b) is displaced to the point where the above pressure and the biasing force of the spring (48f) are balanced. . Note that (48g) is an adjustment screw.

As shown in FIG. 5, the pressurized conductive rubber (48e) is configured so that its electrical resistance value changes depending on the amount of deformation of the rubber (48c). )
By detecting the resistance value, it is possible to detect the pressure inside the bath water blast vibrator (11).

In particular, since the differentiation of the resistance value with respect to the amount of deformation changes rapidly with a constant amount of deformation as the threshold value (481), the amount of deformation of the pressurized conductive rubber (48e) at the set pressure is set to the threshold value (481).
481), a switching output can be obtained with a simple tJ circuit.

, as shown in L, the water pressure detection sensor (48) is non-contact, eliminating causes of problems such as contact corrosion, contact opening/closing hysteresis, and flat spring fatigue that were inevitable with conventional switch-type pressure sensors. , long life, accurate and stable pressure detection.

The jet nozzles (2), (3), and (4) each use an automatic variable jet nozzle configured to be able to change the jet amount and jet pressure of bath water.
4) have the same configuration, the foot side jet nozzle (2) will be taken as an example and explained with reference to FIG.

The foot side jet nozzle (2) is connected in communication with the foot side jet nozzle connection port (1g) of the bath Fff main body (1). The valve seat forming cylinder (21) fitted into the valve seat forming cylinder (21) is inserted into the valve seat forming cylinder (21).
) and a valve body (22) for adjusting the jetting amount that approaches and leaves the valve seat (21a) from the rear.
2) and a nozzle valve body advance/retreat motor (old) that removably supports the nozzle valve body and moves it forward and backward, and the valve seat forming cylinder body (2).
1) Throat (24) supported freely in front of 4 swings
It is made up of.

The nozzle body (20) has a gasket (1
It is removably fixed to the wall surface of the bathtub body (1) by a mounting screw (II) screwed through the nozzle body (20), and one end is attached to the central peripheral wall of the nozzle body (20).
) is connected in communication with the other end of the intake pipe (12), and a bath water bullet feeding vibrator (■1) is connected in communication with the rear peripheral wall of the nozzle body (20).

Further, a cylindrical decorative cover (26) whose front portion is folded outward is fitted onto the front edge of the nozzle body (20).

The valve seat forming cylinder (21) has a rear end surface located in the vicinity of the bullet 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 front inner peripheral surface of the valve seat forming cylinder body 2 [), and the throat (24) having a spherical outer peripheral surface at the base can be oscillated. It fits freely. (25) is a throat fixing member.

At the center of the rear end of the valve seat forming cylinder (21) is a valve seat (2!a).
) ', and the valve seat (21a) is moved toward and away from the valve body (22) for adjusting the jet amount ffl.
), the opening/closing amount (adjusting the jet m and jet pressure) of the bath water flow path (27) can be adjusted.

The motor (Ml) for driving the nozzle valve body forward and backward is attached to the rear wall (20g) of the nozzle body (20).
The coil (23a) provided in the motor casing (23) and the armature (23b) equipped with a permanent magnet are configured to perform a stepping operation, and the rotating shaft of the motor (Ml) is connected to a hollow shaft. A ball screw (23e) is configured inside the motor to convert the rotational motion of the motor (old) into linear motion in the axial direction. The valve body (22) is moved forward and backward.

(23g) is a rotation regulating piece that prevents the above-mentioned valve body support rod (23d) from turning around with the pole screw (23c), and (22e) is a rear end periphery of the valve body (22) for adjusting the amount of ejection. This is a bellows-shaped waterproof cover interposed between the front surface of the rear wall (20g) of the jet nozzle body (20).

Furthermore, the motor (old) for driving the nozzle valve body forward and backward is equipped with a magnet (
A valve body reference position detection sensor (23r) consisting of a valve body support rod (23N) and a Hall element (231) is installed.
The Hall element (23d) changes in accordance with the forward/backward movement of the
1) is converted into an electrical change and inputted to the control section (C) to detect the deviation of the ejection amount regulating valve body (22) from the reference position.

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

As shown in FIGS. 7 and 8, the air intake section (5) has an air intake section attachment port (1r) on the edge (1a) of the bathtub body (1).
) and open the rectangular box-shaped air intake body (8
0), the top opening of the main window air intake body (80) is covered with the lid (82), and the air intake port (82a) formed only on the outside of the lid (82) is inserted. The outside air and the inside of the air intake section main body (80) are communicated with each other.

An intake pipe connection part (83) is provided at the center of the bottom of the air intake main body (80), and one end of the intake vibes (12) (12) is connected to the front and rear walls of the connection part (83), respectively. The air taken into the air intake body (80) is supplied to each of the ejection nozzles (2), (3), and (4) via each intake vibrator (12) (12).

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

An air bubble amount adjustment valve (87) is provided in the intake vibe connecting portion (83) to open and close a communication path (86) between the connecting portion (83) and the intake body (80). The ffi control valve (87) consists of a cylindrical valve body 88) whose upper end edge communicates with the bottom of the intake body (80), and a cylindrical valve body 88).
8) The motor for driving the valve body for the nozzle (
Bubble volume adjustment valve body drive motor (M) with the same configuration as the old)
2), the valve body support rod (89) attached to the motor (M2), and the valve seat (88b) attached to the tip of the rod (89) and formed on the upper edge of the valve body (88). It is composed of a mouth (I: a closed valve body (90)).

-4- The valve body driving motor (M2) for adjusting the bubble m is provided with a valve position detection sensor having the same configuration as the valve body reference position detection sensor (23f') described in iiJ.

In Fig. 7, (84) beam actance type silencer, (
85) is a reverse valve for preventing bath water from flowing back into the intake vibe (12).

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

As shown in FIG. 9, the circulation pump (P) has an upper stage impeller chamber (33) and an F stage impeller chamber (34) connected to each other through a flow path (32d) in the pump casing (32).
The lower impeller chamber (34) is communicated with the bath water suction pipe (10) via the bath water suction passage (32a) provided on the lower side of the pump casing (32), and The hot water bullet feed pipe (
11), and one end of a retractable vibe (41) of a filter (43), which will be described later, via a forced filtration passage (32c) provided on the - side of the upper impeller chamber (33). (32e) is the water inlet, (32r) is the lower water outlet, (
32g) is the upper spout, (zl) is the circulation flow direction, (z
2) indicates the filtration flow direction.

Then, the impeller shaft (35) is mounted so as to vertically pass through the central part of the upper and lower impeller chambers (33) (34), and the upper impeller (33) is mounted on the impeller shaft (35).
a) and the lower impeller (34a) are installed coaxially within the upper and lower impeller chambers (33) and (34), respectively, and the impeller shaft (35) is mounted integrally and watertightly on the pump casing (32). Pump drive motor (M
) is interlocked with the drive shaft (39).

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

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

With this configuration, the upper and lower impellers (33a) (34
When a) is rotated, the bath water flows through the bath water suction pipe (10) -
Water intake (32e) → Bath water suction path (32a) → Lower impeller chamber (34) → Bath water forced feed path (32b) → Lower spout (
32r) - The bathtub body (L
).

Furthermore, as shown in Fig. 9, a filter (43) is connected to the upper impeller chamber (33) of the circulation pump (P) via a lead-in pipe (41) and a return pipe (42). , upper spout of upper impeller chamber (33) (32g
), a part of the bath water sucked into the lower impeller chamber (34) is sent to the filter (43), and the filtered bath water is The hot water is returned through the pipe (42) and sent into the bath water bullet delivery vibrator ([1)], and then forced into the bath water bullet delivery pipe (11) from the lower spout (32'') of the lower impeller chamber (34). I am trying to have it merge into the bath water.

Note that (39a) is an armature, (39b) is a field coil, and (3cre) is a cooling fan.

Next, the configuration of the filter will be explained.

As shown in FIG. 10, the filter (43) has an acrylic mesh (43b) stretched over the lower part of the filter body (43a), and granular filter material (43c) is placed on the mesh (43b).
) is mounted, and the bath water is passed through the filter material (43c) downward from two sides of the filter body (43a), thereby making it possible to filter the bath water. (
43d) is a baffle that prevents the upper surface of the granular filter material (43c) from being washed away during bath water filtration, and also prevents the granular filter material (43c) from flowing out during backwashing, which will be described later. be.

The upper end of the filter body (43a) is connected to the lead-in pipe (4).
1) One end is connected in communication, one end of the return pipe (42) is connected in communication with the lower end of the filter main body (43a), and an electric three-way valve (45) is provided in the middle of the lead-in pipe (41). , connect the drainage vibe (46) to one end of the electric three-way valve (45), and connect the lead-in pipe (4) through the electric three-way valve (45).
I) and the drainage pipe (46) can communicate with each other.

When the electric three-way valve (45) is set in such a state that the drain pipe (46) is blocked and the lead-in pipe 41) is in flow, a portion of the bath water is transferred to the lower impeller chamber of the circulation pump (P). (34) Continuous flow path (32rl) −
Upper inflator chamber (33) - forced filtration passage (32c) - upper spout (32g) - lead-in pipe (41) - m-way valve (45) - filter via the lead-in pipe (41)
43), where it is filtered, passes through a return pipe (42), and joins the bath water which is forced into the bathtub body (1) via the bath water bullet feed pipe (11).

In addition, when the electric three-way valve (45) is switched to close the upstream lead-in pipe (41) and connect the downstream lead-in pipe (41) and the drain pipe (46), the bath water A part of the bath water in the bullet feed pipe (11) passes through the return pipe (42), passes from the bottom to the top of the filter body (43a), passes through the filter material (43c), and passes through the filter material (43c).
43c) backflow cleaning can be performed.

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

Next, the control section (C) will be explained.

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

The input interface (50) includes the rotation speed detection sensor (6), the valve body reference position detection sensor (23''), the valve position detection sensor (91), and the water pressure in the bath water bullet delivery pipe (11). A pressure detection sensor (48), an infrared receiving sensor (30b), and a bath water temperature detection sensor (T) that detects the temperature of bath water in the bathtub body (1) are connected.

The output interface (51) includes the inverter (1) nozzle valve body advance/retreat motor (old), air bubble m, and U#.
Motor for driving the regulating valve body (M2) and electric three-way valve (4
5) is connected.

In addition, the memory (52) stores each motor (8) (old) (old) and electric three-way valve ( A control program for controlling the drive unit such as 45) is stored.

In particular, control of circulation/pump (P) rotation speed is performed using an AC power supply (
The frequency of the pump drive motor (M) is converted by the inverter (1) controlled by the controller (C).
).

In particular, the filter (43) is stored in the memory (52) of the control unit (C).
A routine for preventing freezing of the bath water is stored, and this routine is executed when the detected value of the bath water temperature detection sensor (T) falls below a certain temperature (for example, 5° C.).

As shown in FIG. 11, this anti-freezing routine detects the bath water temperature in the bath water circulation flow path (D) using a bath water temperature detection sensor (T).
) 111) If the temperature of the bath water is lower than (-)℃ (IIIN), the abnormal lamp (30d) will blink 117), and then the operation of the circulation pump (P) will be stopped F'. (118).

Then, the bath water temperature is detected again (112), and the temperature is the same or higher than 0°C < (l], lY), and
When the temperature is lower than 5℃ (1,12N), the pressure detection sensor (
48) to detect the water level in the bathtub body (1) (113)
, if the water level is higher than a certain level (for example, the height of the suction port of the bath water suction pipe (10)) (113Y), the abnormality lamp (30d) is blinked (11,4), and the circulation pump (P
) at low speed and return to step (ill).

Further, if the water level in the bathtub body (1) has not reached the above level, the operation of the circulation pump (P) is stopped.

That is, the bath water temperature is within the range of 0°C to 5°C, and the water level in the bathtub body (1) detected by the pressure detection sensor (48) is lower than the suction of the bath temperature suction pipe (10). If the temperature is high, the inverter (1) outputs a low-frequency AC output to the pump drive motor (M), and the circulation pump (P) is rotated at low speed to flow the bath water in the filter body (43a). At the same time, freezing is prevented by heating the bathtub body (1) with the residual heat of the bath water in the bathtub body (1).

In this way, in order to operate the circulation pump (P) at low speed to prevent freezing, a water level detection means is required as a means.
A pressure detection sensor (48) of C, a detection sensor (T) as a bath water temperature detection means, or a circulation pump surrounding temperature detection means are used.

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

As shown in Fig. 11, the remote controller (30) has an ON/OFF switch (60), a mild plow switch (61L) which is a preferred jet mode switch, a shiatsu plow switch (82), and a pulse plow switch (61).
3), Pine Surge Blow Switch (64), ``y Ave Blow Switch (65), Air Pulse Pro Switch (79), Air Bubble Increase/Decrease Switch (6B) (8
7), bath water spout strength switch (6g) (69),
14th period increase/decrease switch (70) (71), all jet nozzle usage pattern switch (72) which is a changeover switch for your favorite jet nozzle usage pattern, circulation usage button switch (73), dorsal jet nozzle usage pattern switch ( 74), foot side jet nozzle usage pattern switch (75
), and ventral jet nozzle usage pattern Sui Sochi (76
) and a filter cleaning switch (77).

Then, by turning on the ON/OFF switch (60), the control section (C) is activated.

In addition, (78) is a power lamp, (60a) is an operation indicator lamp, (61a) (82a) (f33a) (84
a) (65a) (79a) are each mode switch display lamp, (66a) (67a) are bubble m setting lamps,
(68a) (B9a) is the bath water jet strength setting lamp, (
70a) (71a) is a bath water spout cycle setting lamp, (7
2a) (73a) (74a) (75a) (76a
) is the jet nozzle usage pattern setting lamp, and (7
7a) is a filter cleaning switch indicator lamp.

Moreover, such a remote controller (30)
As shown in the figure, the front end is equipped with an infrared irradiation section (30a), and by operating each switch, a preset multi-frequency tone modulation system (MF
TM), an infrared signal modulated according to the operation of each switch is transmitted from the infrared irradiation section (30a),
The same infrared rays are detected by an infrared receiving sensor (30b) installed in the bathroom.
) (see Figure 1), is sent to the input interface (50) of the control unit (C), and is sent to the memory (50).
A desired drive device is driven based on the control program read from 2).

Moreover, the above-mentioned remote controller (30) is constructed so that it can float on the bathing water surface, so that the bather can operate it while taking a bath.

In addition, an infrared receiving sensor (30b) and an air intake part (5)
and can also be configured externally.

With the above configuration, the bubble generating bath 1fff (A) is controlled by a remote controller (30) that can be operated on the bath water surface, controlling the rotation speed of the circulation pump (P) and the number of rotations of each jet nozzle (2) via the control unit (C). (3) Adjustment of the opening/closing amount and opening/closing speed of the ejection amount regulating valve body (22) provided in (4), and the opening/closing amount and opening/closing speed of the air bubble amount regulating valve (87) provided in the air intake part (5). , can perform switching operation of the electric three-way valve (45),
Adjustment of the rotation speed of the circulation pump (P), adjustment of the opening/closing amount and opening/closing speed of the ejection amount regulating valve body (22), adjustment of the opening/closing amount and opening/closing speed of the bubble amount regulating valve (87), and these Depending on the combination, the amount of bath water spouted from each jet nozzle,
You can set six types of jet modes (mild blow, shiatsu blow, pulse blow, pine surge blow, wave blow, and air pulse blow) with different jet pressures and amounts of air bubbles mixed in, and each jet mode can be controlled using a remote controller (30 ) with your favorite jet mode switch in Sochi (6
1> to (65) can be selected by ON-OFF operation.

Furthermore, for each mode, there is a bubble volume increase/decrease switch (ee) (67) and a hot water jet strong/local side switch (67).
11) (69) and period increase/decrease switch (7Q) (
71) and by turning them on and off, respectively.
It is possible to increase or decrease the amount of air bubbles, to adjust the strength of the hot water jetting out, and to increase or decrease the cycle of the jetting bath water.

Furthermore, by turning ON/OFF each of the selector switches (72) to (76) for the desired jet nozzle usage pattern, it is possible to select the usage pattern of the six jet nozzles to which the jet mode is applied. I have to.

Further, by operating the filter cleaning switch (77) ON-OFF, the electric three-way valve (45) is operated to perform backflow cleaning of the filter (43).

(to) Effect According to the present invention, the following effects are produced.

A bath water circulation flow path consisting of a bath water suction flow path and a bath water forced flow flow path is interposed between the bathtub body and a circulation pump installed outside the bath (a) body, and a bath water forced flow flow path is provided. A jet nozzle is provided at the discharge part of the bath IQ into the main body of the bathtub, and the jet nozzle is configured to be able to jet the bathwater mixed with air bubbles into the bathtub main body.A filter is connected to the circulation pump, and the bath water is In a bubble-generating bathtub configured to filter bathwater flowing through a circulation flow path,
By using necessary detection means such as a means for detecting the water level in the bathtub or a means for detecting the temperature of the bath water, when it is sensed that the bath water has reached a certain low temperature, the circulation pump is activated and the water inside the filter is activated. Because the structure is configured to circulate the bath water, in cold weather, when the temperature of the bath water drops, the circulation pump can be automatically operated at low speed to prevent the filter from freezing. Freezing can be prevented by keeping the water in pipes, pumps, and filters stationary at low temperatures.

[Brief explanation of 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 diagram of the conceptual structure of the bubble-generating bathtub. FIG. 4 is a cross-sectional explanatory diagram of the pressure detection sensor. FIG. 5 is a graph showing the relationship between the amount of deformation of pressurized conductive rubber and the electrical resistance value. FIG. 6 is an enlarged sectional view of the jet nozzle. Figure 7 is a piping diagram of the intake vibe. FIG. 8 is an enlarged sectional view of the air intake section. FIG. 9 is a partially cutaway front view of the pump drive motor and circulation pump. FIG. 10 is a sectional view of the filter. FIG. 11 is a flowchart of the filter freeze prevention routine. FIG. 12 is a plan view of the remote controller. (A): Bubble generation bathtub (P): Circulation pump (C): Control unit (D): Bathwater circulation flow path (T): Bathwater temperature detection sensor (1): Bathtub body (2) Two-leg side spout Nozzle (3): Back spout nozzle (4): Ventral spout nozzle (10): Bath water suction pipe (11): Bath water bullet delivery pipe (48): Pressure detection sensor

Claims (1)

[Claims] 1) A bath water circulation channel consisting of a bath water suction channel and a bath water forced flow channel is interposed between the bathtub body and a circulation pump installed outside the bathtub body. A jet nozzle is provided at the discharge part of the bath water forced flow channel into the bathtub body, and the jet nozzle is configured to be able to jet the bath water mixed with air bubbles into the bathtub body, and a filter is communicated with the circulation pump. In the bubble-generating bathtub configured to filter the bathwater flowing through the bathwater circulation flow path, when the required detection means detects that the temperature of the bathwater has fallen to a certain low temperature, the circulation pump is automatically activated. An antifreeze device for a filtration device in a bubble-generating bathtub configured to prevent bathwater from freezing in a filtration device by rotating the filtration device at low speed and circulating the bathwater to the filtration device.