JP2932566B2 - Bath water circulation pump control method in bubble generating bathtub - Google Patents

Description

The present invention relates to a method for controlling a bath water circulation pump in a bubble generating bath.

(B) Conventional technology Conventionally, as one form of a bathtub, as described in Japanese Patent Application Laid-Open No. Sho 59-135058, a bathtub is provided between a bathtub body and a circulating pump installed outside the bathtub body. There is a type in which a bath water circulation channel including a suction pipe and a bath hot water pipe is provided, and an air intake unit is provided in the middle of the bath hot water pipe.

With this configuration, the bath water in the bathtub body is sucked through the bathwater suction pipe by the circulation pump, and the bathwater is spouted into the bathtub body from the discharge portion of the pipe through the bathwater high-pressure pipe by the circulation pump. At this time, air is mixed into the bath using the negative pressure generated by the injection of the bath, so that the bubble-containing bath can be blown into the bathtub body.

However, if the hairs that have fallen into the bath water enter the circulation pump, they may be wrapped around the impeller of the pump and reduce the pump efficiency. In addition, dust and the like floating in the bath water adhere to and accumulate on the bent portion of the bath water circulation channel, not only hindering the flow of the bath water, but also cause organic substances adhering to these to rot and cause odor. May be.

Therefore, a filter net is provided at the beginning of the bath water suction pipe opened on the inner surface of the bathtub main body, and the suction bath water is filtered at the start end of the bath water suction pipe, so that it is installed in a device such as a circulating pump downstream of the bath. , Hair removal, dust and the like are prevented from entering.

(C) Problems to be Solved by the Invention However, when the filter net is clogged, not only does the flow of the bath water to the circulation pump deteriorate, which impairs the bath water jetting performance. Even if the water level does not drop, the bath water will not be supplied to the circulation pump, and the pump will run idle, causing the shaft seals such as mechanical seals to generate heat or burn. there were.

(D) Means for Solving the Problems The present invention provides a bath water circulation flow path comprising a bath water suction pipe and a bath water forced-feed pipe between a bathtub body and a circulation pump installed outside the bathtub body. In the bubble generating bath tub in which bath water is configured to be able to circulate between the bath tub body and the circulation pump, and a filter net is provided at the beginning of a bath hot water suction pipe opened on the inner surface of the bath tub body, A pressure sensor for detecting a water pressure in the bath water suction pipe, wherein a value detected by the pressure sensor during operation of the circulating pump is lower than a preset value determined as clogging of the filter net; The present invention also relates to a method for controlling a hot-water circulation pump in a bubble-generating bath, wherein the operation of the circulation pump is stopped.

Further, in the present invention, when the detected value of the pressure sensor is lower than the set value in claim 1, it is determined that clogging of the filter net has occurred, and an alarm prompting cleaning of the filter net is issued. Has features.

(E) Function / Effect According to the present invention, when the circulation pump is operated to circulate the bath water, if the filter net provided at the beginning of the bath water suction pipe is clogged by hair loss, dust, etc. Hot water suction resistance increases, the pressure drop of the circulating hot water in the hot water suction pipe increases, and the detection value of the pressure sensor during the operation of the circulating pump decreases.

Therefore, a value obtained by subtracting the pressure drop due to the hot water suction resistance of the filter net in a normal state without clogging from the pressure due to the bath water level filled in the bathtub body is set as a preset value, and the value is set in advance during the operation of the circulation pump. If the detected value of the pressure sensor is lower than the above set value, it can be detected as clogging of the filter net.

When the clogging of the filter net is detected in this way, the operation of the circulating pump is stopped to prevent the pump from being damaged.

(F) Example First, the overall structure of the bubble generating bath according to the present invention will be described.

FIGS. 1 and 2 show an air bubble generation bathtub (A) according to the present invention.
1 is a schematic view showing an overall perspective view and a conceptual configuration of a tub body (B) installed in a bathroom and various devices attached to the tub body, and a functional unit case (B) installed separately from the tub body (B). E) and various devices installed in it.

The bathtub main body (B) is provided on the front and rear walls and the left and right side walls of the bathtub main body (B) formed in an open top box shape.
Chest ejection nozzle (2) (2) (3) (3) (4)
(4) is provided in total of six.

Further, a flange-shaped edge (1) having a constant width is formed on the periphery of the bathtub body (B), and an air intake section (5) is provided on the edge (1), and the air-intake pipe (8) is provided. , Each jet nozzle (2)
(2) It communicates with (3), (3), (4), and (4).

An operation panel (93) is mounted on the edge (1), and an infrared signal receiver (R1) connected to the controller (C) is provided on the panel (93) to provide a remote controller (R). ) To receive infrared signals.

The function case (E) includes a bath water circulation pump (P), an inverter (I) for controlling a pump driving motor (M), a motor for driving the pump (M), and a motor for driving the valve body for nozzles. A controller (C) for controlling (M1), a filter (f) for filtering bath water, and an electric three-way valve (Ve) for controlling the filter (f) are housed therein.

Then, between the water inlet (94) provided at the lower part of the side wall of the bathtub body (B) and the bathwater circulation pump (P), the bathwater is sent from the bathtub body (B) to the bathwater circulation pump (P). Bath water suction pipe (10), and a bath water circulation pump (P) and each jet nozzle (2) (2) (3) (3) (4)
A bath water circulation channel (D) is provided between the pump (P) and the pump (P) through a strong bath pipe (11) for sending bath water from the pump (P) to the bathtub body (B). ing.

With the above configuration, the remote controller (R) is operated, and the inverter (I) to be described later is controlled via the control unit (C).
And the output pressure of the pump (P) can be changed steplessly by controlling the output frequency of the bath water circulation pump (P) connected to the pump drive motor (M). , Controlling the nozzle valve advance / retreat drive motor (M1)
The hot water jet pressure is adjusted to each jet nozzle (2) (2) (3) (3)
(4) It can be changed or adjusted every (4).
Also, by operating the operation panel (93), the electric three-way valve (Ve)
, The backwashing of the filter (f) can be performed.

As shown in FIG. 3, the bath water circulation pump (P) communicates the upper impeller chamber (33) and the lower impeller chamber (34) in the pump casing (32) through a communication passage (32d). The lower impeller chamber (34) is provided at one lower side of the pump casing (32).
a) and communicate with the bath water suction pipe (10) through
The hot water supply pipe (11) is communicated with the hot water supply pipe (11) through a hot water supply path (32b) provided on the other lower side of the pump casing (32).

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) of the same impeller shaft (35) are mounted coaxially in the upper and lower impeller chambers (33) and (34), respectively, and the impeller shaft (35)
Are connected to a drive shaft (39) of a pump drive motor (M) integrally and watertightly mounted on a pump casing (32).

A rectifying plate (29) protrudes from the end of the bath water suction passage (32a) to rectify the bath water drawn into the lower impeller chamber (34), thereby increasing the pump efficiency.

In addition, it is connected to a suction pipe (41) of a filter (f) to be described later via a strong filtration path (32c) provided on one side of the upper impeller chamber (33).

(36) is a mechanical seal lubricated with bath water attached to the impeller shaft (35), (39a) is a motor casing of the pump driving motor (M), (39b) is a rotor, and (39c)
Is a fixed magnetic pole, (39d) is a cooling fan that also serves as a water slinger, (39e) is a cooling intake port, (39f) is a cooling exhaust port, (32e) is a suction port, (32g) is a water discharge port, and (34b) is a The communication hole, (Z1) is the circulation flow direction, and (Z2) is the filtration flow direction.

With the above configuration, when the pump driving motor (M) is rotated, the bathtub body (B) → bathwater suction pipe (10) → lower impeller room (34) → bathwater forcible pipe (11) → bathtub body (B) ). The lower impeller room (3
4) Part of the bath water sucked into the lower impeller room (34) → communication channel (32d) → upper impeller room (33) →
Retraction pipe (41) → Filter (f) → Return pipe (42)
→ Circulate in the order of the bath hot water pipe (11) → the bathtub body (B).

As shown in FIG. 4, the pressure transmission path of the pressure sensor (Sp) for detecting the water level of the bath water is connected to a bath water circulation pump (P).
Opening (Sp1) on the side wall of the bath water suction passage (32a) and a temperature sensor (T) for detecting the bath water temperature in the lower impeller room (34)
Is provided. Therefore, the water level and temperature of the bathwater in the bathtub body (B) are measured at the position of the bathwater circulation pump (P).

A temperature sensor (T) for detecting the temperature of the bath water is provided in the lower impeller chamber (34).

Therefore, the water level and temperature of the bathwater in the bathtub body (B) are measured at the position of the bathwater circulation pump (P).

Next, the filter net (F) provided at the beginning of the bath water suction pipe (10) will be described.

The bath water suction pipe (10) is opened at a lower portion of the bathtub body (B) through a water inlet (94) provided at the start end thereof, and the end is connected to the bath water circulation pump (P).

As shown in FIGS. 5 and 6, the water suction port (94) is a substantially cylindrical suction port body (i1) having a female screw formed on the inner peripheral surface of the front end.
And a substantially cylindrical mounting bracket (i
2), suction between the flange (i3) formed on the front end face of the mounting bracket (i2) and the front end face of the suction port main body (i1). The water inlet (94) is attached to the bathtub body (B) by sandwiching the wall (B1) around the hole.

A bridge (i4) is protruded from the inner surface of the mounting bracket (i2), and a female screw boss (m2) is provided approximately in the center of the mounting bracket (i2) while allowing the hot water to flow through the bridge (i4).
, And a female screw (m1) for mounting the suction port cover (i6) is formed in the inside.

As shown in FIGS. 5 and 6, the inlet cover (i6) is formed in a substantially plate-like shape with a circular plate material, and a plurality of long holes (i5) for flowing bath water are formed in a substantially concentric manner. It is arranged.

Also, a male screw (m) is protruded at the center of the back surface of the suction port cover (i6) and screwed to the female screw (m1) to attach the suction port cover (i6) to the water suction port (94). ing.

In the figure, (i7) and (i8) are engagement grooves formed in the female screw (m1) and the male screw (m), and (r) is provided in an annular space formed by the engagement grooves (i7) and (i8). It is a locking ring mounted.

Inside the water inlet (94), a filter net (F) is stretched between the inner peripheral surface of the inlet main body (i1) and the outer peripheral surface of the female screw (m1). The inhaled bath water is filtered.

As shown in FIG. 7, the filter net (F) is made of a stainless steel thin wire as a weft wire, and is formed in a cylindrical shape with a bottom opening toward the downstream of the bath water circulation. The boundary between the bottom surface (F1) and the side peripheral surface (F2) of the net (F) is sharply bent to increase the curvature of the bent portion (F3).

A cylindrical portion (F5) extends forward in the center of the bottom (F1) of the filter net (F), and a circular hole is formed at the tip of the cylindrical portion (F5). Insert the base end of the substantially cylindrical inner fitting member (F4) made of a thin plate,
A substantially cylindrical outer fitting member (F8) is externally fitted around the outer periphery of the cylindrical portion (F5), and the outer and inner fitting members (F8) (F4) and the cylindrical portion (F4) interposed therebetween. F5) is fixed by spot welding or other means.

(F9) is a flare portion having a substantially arc-shaped cross section formed at the rear end edge of the inner fitting member (F4), and the bottom surface (F1) of the filter net (F).
It supports the boundary between the cylindrical portion (F5) and the inside from the inside.

Also, a folded portion (F6) that protrudes outward is formed at the distal end edge of the outer fitting member (F8) to provide a clue when the filter net (F) is attached or detached.

In addition, the outer peripheral reinforcing material (F7) having a substantially U-shaped cross section made of a stainless steel sheet from the bent portion to the distal end edge by refracting the distal end portion of the side peripheral surface (F2) of the filter net (F) outward. The outer peripheral edge of the filter net (F) and the outer peripheral reinforcing material (F7) are integrated by refracting the above coated portion outward in a substantially L-shaped cross section.

Then, the base end of the inner fitting member (F4) is fitted to the outer peripheral surface of the female screw boss (m2), and the outer peripheral edge of the outer peripheral reinforcing member (F7) is fixed to the inside of the mounting bracket (i2). It is fitted and adhered to the peripheral surface.

As described above, since the filter net (F) is formed in a cylindrical shape with a bottom, the filter area can be enlarged and the cleaning interval of the filter net (F) can be lengthened, and the bent portion (F3) Is increased, the slip between the wires forming the filter net (F) is prevented, and the rigidity of the filter net (F) is increased by cold work hardening. (F) The inner fitting member (F4) is fixed to the inner periphery of the cylindrical portion (F5) extending from the bottom surface (F1), and the outer peripheral edge of the side peripheral surface (F2) of the filter net (F) is reinforced. Since the strength and rigidity of the filter net (F) are increased by coating with the filter material (F7), the filter net can be filtered even if a little excessive force is applied when filtering the bath water or attaching or detaching the filter net. The deformation of (F) is prevented.

In addition, due to the inner fitting member (F4) and the outer peripheral reinforcing material (F7), the close contact between the filter net (F), the outer peripheral surface of the female screw (m1) and the inner peripheral surface of the mounting bracket (i2) is improved, Filtration accuracy can be improved.

Next, each ejection nozzle provided on the side wall of the bathtub body (B) will be described.

Foot side, chest side, back side jet nozzle (2) (2) (3)
(3), (4) and (4) are automatically variable ejection nozzles of the same configuration, each of which is capable of automatically changing the ejection amount and ejection pressure of the bath water. The foot-side ejection nozzle (2) is an example. This will be described with reference to FIG.

The foot-side ejection nozzle (2) has a bottomed cylindrical nozzle body (20) attached to the ejection nozzle connection port (9) opened on the side wall of the bathtub body (B), and the inside of the nozzle body (20). A valve seat forming cylinder (21) fitted from the bathtub body (B) side, and an ejection amount adjusting valve body (22) that comes into contact with and separates from behind a valve seat (21a) formed in the valve seat forming cylinder (21). And a motor (M1) for driving the nozzle valve body to reciprocate the ejecting amount adjusting valve body (22) to perform the above-mentioned contacting / separating operation; and a swingable front part of the valve seat forming cylinder (21). It consists of a supported throat (24).

In addition, an intake pipe connection part (20b) is opened in the inner peripheral wall at the center of the nozzle body (20), and the intake pipe (8) is
The inside of the valve seat forming cylinder (21) and the air intake part (5) are connected to each other.

A strong feed pipe connecting part (20c) is opened in the inner peripheral wall at the rear part of the nozzle body (20) so that the inside of the rear part of the valve seat forming cylinder (21) communicates with the hot water feed pipe (11). ing.

The nozzle valve advancing / retracting drive motor (M1) is a stepping motor, and a ball screw mechanism (Bs) is interposed between the motor and the ejection amount adjusting valve (22) to provide an ejection amount adjusting valve (B1). 22) can be moved toward and away from the valve seat (21a).

(23j) is a valve position sensor comprising a magnet and a magnetic Hall element.

With the above configuration, the bath water from the bath water circulation pump (P) passes through the gap between the valve seat (21a) and the valve body (22) for adjusting the amount of spout, and is spouted from the valve seat (21a). Negative pressure is generated, and air from the air intake (5) can be mixed into the spout bath water. In addition, the operation of the nozzle valve body drive motor (M1) enables the strength of the bath water spout to be increased. Can be adjusted.

In addition, each ejection nozzle (2) (2) (3) (3) (4)
(4) has the same configuration, but each ejection nozzle (2) (2)
(3) (3) (4) (4) The nozzle valve advance / retreat drive motors (M1) are individually controlled by the control unit (C), and accordingly, the ejection nozzles (2) (2) )
(3) Each of (3), (4), and (4) can have a different bathing mode.

As shown in FIG. 9, the air intake section (5) is provided at the edge (1) of the bathtub body (B), and the upper opening of the air intake section body (80) is covered with lids on the left and right sides. The inside of the air intake unit body (80) is communicated with the outside air by an air intake (82a) that is covered with the body (82) and formed only outside the lid (82).

Also, the center of the bottom surface of the air intake unit body (80) is connected to each of the ejection nozzles (2), (2), (3) via the intake pipe (8).
(3) (4) It communicates with (4). (92) is a silencer.

As shown in FIG. 2, the control unit (C) includes a microprocessor (50) and an input / output interface (51) (52)
And a memory (53). The input interface (51) includes a valve body position sensor (23j), a pressure sensor (Sp), a temperature sensor (T), and an infrared signal receiver (R1).
The operation panel (93) provided with is connected.

The output interface (52) is connected to an inverter (I), a motor (M1) for driving the nozzle valve body forward and backward, an electric three-way valve (Ve), various display lamps, and the like.

The memory (53) controls each motor (M) (M1) based on a signal from each of the sensors and a signal from the remote controller (R) to control each of the ejection nozzles (2) and (2).
(3) (3) (4) (4) A program that can execute six types of bath water blow modes and three types of variations for each blow mode, and a program of initial operation of each actuator at the start of operation And a program for controlling the electric three-way valve (Ve) to perform backwashing of the filter (f) for a certain period of time.

As shown in FIG. 10, the remote controller (R) has various switches (R4) for controlling the bubble generation bath (A), such as an ON / OFF switch and each blow mode switch, in front of the bath. A liquid crystal panel (R5) for displaying the operation state of (A) is provided, and an infrared signal transmitting section (R3) is provided at the front end thereof, and an electric signal from each of the above switches is transmitted to each of the switches in advance. Converts to a serial code signal set for each switch, and transmits infrared light as a carrier from the infrared signal transmission unit (R3).

The serial code signal is sent to the infrared signal receiver (R1)
And is converted into an electric signal, input to the input interface (51) of the control unit (C), and controls the operation of the corresponding actuator according to the control program stored in the memory (53) by the input signal. Thereby, the bubble generation bathtub (A) can be brought into an operation state corresponding to the operation of each switch.

As shown in FIG. 11, the infrared signal receiving section (R1) is disposed on an operation panel (93) provided above the lid (82) of the air intake section (5). 93) are provided with various switches similar to those of the remote controller (R), operating state display LEDs corresponding to the switches, and a filter washing switch. (95) is an alarm buzzer.

With the above configuration, the operation of the actuators such as the pump driving motor (M) and the nozzle valve element driving motor (M1) can be operated by the switch operation of the remote controller (R) or the operation panel (93) on the bath surface. Control
Number of rotation of bath water circulation pump (P), each jet nozzle (2)
(2) By adjusting the opening / closing amount of the valve (22) for adjusting the ejection amount of (3), (3), (4) and (4), the ejection amount and the ejection pressure of the bath water ejected from each ejection nozzle are controlled. Thus, it is possible to select the blow mode of the bath water corresponding to the various blow mode switches and variations thereof.

The filter (f) is a down-flow type filter capable of backwashing a filter medium. As shown in FIG. 12, upper and lower shells (28f) (28g) each having a substantially cylindrical shape with a bottom are provided at each opening. Bolts (28d) through which the upper and lower flanges (28d) and (28e)
c) to form a filter body (43a), form a support net (43b) in the lower part of the filter body (43a), and attach upper and lower baffle plates (43d) (43f) above it. The lower baffle plate (43f) and the supporting mesh (4
3b) and a beaded filter medium (43
c) is filled.

Then, at the upper end of the filter body (43a), a drop-in pipe connecting portion (41a) connected to the upper impeller chamber (33) of the bath circulation pump (P) through a drop-in pipe (41).
And an exhaust pipe connecting part (28a) communicating with the outside air via an exhaust pipe (28), and at the lower end of the main body (43a), communicating with a hot water supply pipe (11) via a return pipe (42). A connected return pipe connecting portion (42a) is provided. (28b) is a reinforcing rib, and (29a) is an O-ring.

The electric three-way valve (Ve) is connected to the middle part of the suction pipe (41), and a drain pipe (46) is connected to one end of the three-way valve (Ve), and the flow path of the three-way valve (Ve) is connected. By switching
The bath water from the upper impeller room (33) is removed from the filter medium (43
The bath water is filtered by passing the filter layer formed in c) from top to bottom or backwashing, that is, the bath water from the lower impeller chamber (34) of the bath water circulation pump (P), The filter layer is collapsed by ascending in the filter body (43a), and the filter medium (43c) is caused to flow, so that the filter cake deposited or adhered to the filter medium (43c) is washed and discharged from the drain pipe (46). Being able to choose one of them.

Further, by turning ON / OFF the filter washing switch provided on the operation panel (93), the electric three-way valve (Ve) is switched for a certain period of time using the timer function of the control program, and the filter (f) of the filter (f) is switched. Backwashing of filter media can be performed.

Hereinafter, the operation of the bubble generating bath (A) will be described with reference to the flowchart of FIG.

FIG. 13 shows the main routine, in which the power is turned on (20
0) Then, all ejection nozzles (2) (2) (3)
(3) (4) Initial settings (210), such as causing the nozzle valve advance / retreat drive motor (M1) to perform an initial operation at power-on, are performed.

 The initial operation when the power is turned on will be described later.

In the initialized state, the valve body (22) of each ejection nozzle (2) (2) (3) (3) (4) (4)
The valve is opened 6mm from the fully closed position, so that the bath water can be smoothly supplied and drained.

During the initialization, the bath water circulation pump (P) holds the operation stop state (215), and the control unit (C) operates the pressure sensor (Sp).
And waiting for input from the temperature sensor (T), the temperature sensor (T) detects the temperature of the bath water (220),
If this is within the range of 5 ° C. to 50 ° C. (Y), the state of the operation switch is detected (225), and if it is ON (Y), the bathtub water level is detected from the output of the pressure sensor (Sp). (227),
If the water level is equal to or higher than the water level at which the blow operation can be performed (Y) and the temperature of the bath water is detected by the temperature sensor (T) (230), and if the water temperature at which the blow operation can be performed (Y), various types from the remote controller or the operation panel are used. The subroutine is executed according to the instruction input such as blow operation or filter washing (50).
0).

The blow operation subroutine (500) has substantially the same configuration as that described in Japanese Patent Application No. 1-130611 filed earlier by the present applicant.

Next, ON / OFF of the operation switch is detected (995),
If it is ON, (Y), the process returns to step (230), and the execution of the above subroutine is continued.

In step (220), if the water temperature is not the blow operation possible (N), the bath water level is detected (235). If the water temperature is equal to or higher than the blow operation water level (Y), the bath temperature is detected. (237) If the temperature is lower than 5 ° C. (Y), the anti-freezing operation subroutine (300) is executed.

If the temperature of the bath water is not 5 ° C. or less in the step (237) (N), a high water temperature warning (400) is issued and the operation is stopped (215).

If the water level is equal to or lower than the water level at which the blow operation can be performed in the step (235) (N), a water level drop warning (410) is issued and the blow operation is stopped (215).

The water level at which the blow operation can be performed means that the water level of the bath water is at least the water inlet (94) provided in the bathtub body (B), and
It satisfies various conditions such as being higher than the upper end position of the ejection nozzle at the highest point.
The case where the temperature is in the range of 50 ° C to 50 ° C is defined as the water temperature at which the blow operation can be performed.

As shown in FIG. 14, the initial operation at the time of turning on the power is to operate the nozzle valve advance / retreat drive motor (M1) in the valve closing direction and to operate all the ejection nozzles (2) (2) (3) ( 3) (4)
The ejection amount adjusting valve element (22) of (4) is fully closed, the nozzle valve element advance / retreat drive motor (M1) is stepped out, the pulse counter is cleared, and then the ejection amount adjusting valve element (22). 22) is fully opened to complete the initial operation at power-on.

During the initial operation, the operation is checked by the valve body position sensor (23j), and if there is an abnormality, the operation of the bubble generation bath (A) is stopped.

Further, in this embodiment, at the start of each of the above-mentioned blow operations, when a sudden strong jet is jetted into the bathtub body (B),
At the start of each blow operation, the number of revolutions of the bath water circulation pump (P) and each of the jet nozzles (2) (2)
(3) (3) (4) The operation of the nozzle valve advance / retreat drive motor (M1) of (4) is controlled to gradually increase the strength of the bathwater ejection, and the operation shifts to the blow operation. Is performed, and the clogging of the filter net (F) is detected during the child safety control.

 First, the child safety control will be described.

As shown in FIG. 15, the child safety control starts from the time when the operation switch is turned on (t1), and the ejection nozzles (2) and (2) that have been stopped in the fully opened state (t2) during the initial operation.
(3) (3) (4) (4) Fully close (t3) the ejection amount adjustment valve element (22), and the nozzle valve element drive motor (M1)
After stepping out of the counter and clearing the counter and holding this fully closed state for a short time (t4) (about 0.2 seconds), each ejection nozzle (2) (2) (3) (3) takes about 1.2 seconds. (4) The ejection amount adjusting valve body (22) of (4) is fully opened again (t5).

On the other hand, by controlling the output frequency of the inverter (I), from the time (t6) when the valve body (22) is completely closed (t3),
Until the valve element (22) is fully opened (t5) again (t7) (approximately 1.4 seconds), the rotation speed of the bath water circulation pump (P) is stopped from a stopped state to a predetermined rotation speed (about 1800 rpm). Raise (t
8) After that, the rotation of the bath water circulation pump (P) is started up to the rotation number (ta) required for the blow operation specified at a gentler start-up (t9).

 Next, detection of clogging of the filter net (F) will be described.

When the bathwater circulation pump (P) is stopped, the water pressure in the bathwater suction side flow path is equal to the head (p1) of the bathwater in the bathtub body (B). Circulation pump (P)
The water pressure in the bath water suction side flow path gradually decreases due to the resistance of the flow path, particularly the resistance of the filter net (F).

Then, when the filter net (F) is clogged, the water pressure in the bath water suction side flow path is much lower than in a normal state where the filter net (F) is not clogged.

By detecting this pressure drop with the pressure sensor (Sp), clogging of the filter net (F) can be detected.

In this embodiment, when bath water is filled in the bathtub body (B), the detection value of the pressure sensor (Sp) is about 300 mmAq (p2), but as the rotation of the bath water circulation pump (P) gradually increases. When the filter net (F) is clogged, the detection value of the pressure sensor (Sp) drops to -600 mmAq to -800 mmAq.

Therefore, the threshold value (p3) is set to -150 mmAq, and when the detection value of the pressure sensor (Sp) becomes lower than the threshold value (p3), it is determined that the filter net (F) is clogged, and the bath water circulation pump ( The operation of P) is stopped to prevent damage such as seizure of the mechanical seal (36) due to the idle operation of the bath water circulation pump (P), and to issue an alarm from the alarm buzzer (95) to filter the net. (F) cleaning can be encouraged.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a bubble generating bathtub according to the present invention. FIG. 2 is a schematic view showing a configuration of a bubble generating bathtub according to the present invention. FIG. 3 is a longitudinal sectional view of a bath water circulation pump. FIG. 4 is a sectional view taken along the line II of FIG. FIG. 5 is a front view of a water inlet. FIG. 6 is a sectional view taken along the line II-II of FIG. FIG. 7 is an explanatory sectional view of a filter net. FIG. 8 is a longitudinal sectional view of the ejection nozzle. FIG. 9 is a longitudinal sectional view of an air intake section. FIG. 10 is a front view of a remote controller. FIG. 11 is a front view of an operation panel. FIG. 12 is a longitudinal sectional view of the filter. FIG. 13 is a flowchart of a main routine. FIG. 14 is a timing chart of an initial operation at power-on. FIG. 15 is a timing chart of the child safety control and a graph of the water pressure in the bath water suction side flow path. (A): Bubble generation bathtub (B): Bathtub body (D): Bathwater circulation channel (P): Bathwater circulation pump (2) (2) (3) (3) (4) (4): Ejection Nozzle (5): Air intake section (10): Bath water suction pipe (11): Bath water forced-feed pipe

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Obata 5-1, 1-1 Kamiamihigashi, Kokuraminami-ku, Kitakyushu-shi, Fukuoka Tokoki Co., Ltd. Kokura 2nd Plant (72) Inventor Koichi Uchiyama Kitakyushu, Fukuoka 5-1-1, Kamiamihigashi, Kokura-minami-ku, Tokyo Toki Equipment Co., Ltd., Kokura 2nd Factory (72) Inventor: Mitsuaki Hashida 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Tochiki Equipment Co., Ltd., Chigasaki Factory (72) Inventor Akira Hyoto 2-8-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Tochiki Co., Ltd. Chigasaki Factory (56) References JP-A-3-218761 (JP, A) JP-A-3-30765 (JP, A) JP-A 2-127292 (JP, U) JP-A 56-144536 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61H 23/00 520

Claims (2)

(57) [Claims] 1. A bath water suction pipe (10) and a bath water strong feed pipe (11) between a bathtub body (B) and a circulation pump (P) installed outside the bathtub body (B). A bath water circulation channel (D) is provided so that the bath water can be circulated between the bathtub body (B) and the circulation pump (P), and the bathwater is opened on the inner surface of the bathtub body (B). A circulating pump (P) provided with a pressure sensor (Sp) for detecting the water pressure in the bath water suction pipe (10) in a bubble generating bath provided with a filter net (F) at the beginning of the bath water suction pipe (10). If the detected value of the pressure sensor (Sp) during the operation of ()) is lower than a preset value determined as clogging of the filter net (F), the operation of the circulation pump (P) is stopped. A method for controlling a hot-water circulation pump in a bubble-generating bath. 2. When the detected value of the pressure sensor (Sp) is lower than the set value, the filter net (F) is regarded as clogged and the filter net (F) is cleaned. A method for controlling a hot-water circulation pump in a bubble-generating bathtub, wherein an alarm is issued to prompt the user to make a bath.