JPH02241454A - Injection nozzle structure for bubble generating bath tub - Google Patents

Abstract

PURPOSE:To enable microregulation of an injection amount and the injection pressure of a bath hot water by a method wherein an injection nozzle through which bath hot water is injected is formed with a valve body for regulating an injection amount to open and close an injection flow forming flow passage by contact and separation of the nozzle with and from a valve seat and a piezoelectric actuator for opening and closing a valve body by which the valve body is opened and closed in a non-stage at microintervales. CONSTITUTION:An injection flow forming part 50 of each of nozzles 2, 3, and 4 on the foot side, the back side, and the belly side is formed with an air mixing part 70 mounted in the middle of a valve seat forming cylinder body 21, a valve seat 21a located right at the rear of the air mixing part and forming an injection flow forming flow passage 27, a valve body 22 for regulating an injection amount to open and close the injection flow forming flow passage 27 by contact and separation of the valve body with and from the valve seat 21a, and a piezoelectric actuator M1 for opening and closing a valve body to open and close the valve body 22. As noted above, since, through drive of the valve body 22 for regulating an injection amount in a non-stage at microintervals by using the piezoelectric actuator as the motor M1 for opening and closing a valve body, the degree of opening and closing of the valve body are microregulatable, this constitution enables microregulation of an injection amount and the injection pressure of bath hot water through the injection nozzles to a bath tub A body.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a jet nozzle structure for a bubble-generating bathtub.

(b) Conventional technology Conventionally, as a form of the jet nozzle of a bubble-generating bathtub, there was a jet forming part that turned the bath water forcibly fed by a circulation pump into a jet, and a jet was created directly in front of the jet forming part. Some bathtubs are composed of an air suction section that takes air into the bath water to make the bath water mixed with bubbles, and a throat section that guides the bath water containing bubbles into the bathtub body.

The jet forming section is composed of a fixed valve seat that forms a jet forming channel, and a valve body that approaches and separates from the valve seat to open and close the jet forming channel, and the valve body is connected to one end of the throat section. The throat part can be freely adjusted forward and backward on the same axis as the valve seat, and the opening and closing of the valve body can be adjusted in conjunction with the forward and backward adjustment of the throat part, thereby controlling the amount and pressure of the hot water jetted out. I am able to adjust it.

(c) Problems to be Solved by the Invention However, in the case of bath water using the above-mentioned jet nozzle, the amount and pressure of the jet must be adjusted by manually moving the throat section forward and backward, which makes such operations cumbersome. However, when the number of ejection nozzles increases, there is a problem in that the trouble is doubled.

In addition, when adjusting the forward and backward movement of the throat part to adjust the spouting amount and jetting pressure of bath water, it is necessary to adjust the forward and backward movement of the throat part while spouting hot water from the throat part, especially when reducing the spouting volume. There was a problem in that it was difficult to adjust the forward and backward movement of the throat section because the throat section was subjected to large water pressure.

For this reason, it is troublesome to have to stop the spouting of bath water one by one and then adjust the forward and backward movement of the throat part according to the register. There was also the problem that there were cases where the adjustment was not made.

(d) Means for Solving the Problems Therefore, in the present invention, a jet nozzle that is attached to a bathtub body and spouts bubble-mixed bath water into the bathtub body is formed with at least a nozzle casing and a jet flow forming channel. A valve seat for controlling the jet flow, a valve body for controlling the jet flow that opens and closes the jet flow forming flow path by coming into contact with and separating from the valve seat, and a piezoelectric actuator for opening and closing the valve body for opening and closing the valve body for controlling the jet flow. Therefore, it is an object of the present invention to provide a jet nozzle structure for a bubble-generating bathtub that allows fine adjustment of the jet amount and jet pressure of bath water.

(E) Embodiment First, the overall structure of a bubble-generating bathtub equipped with a jet nozzle according to the present invention will be described based on the accompanying drawings.

(A) shown in FIGS. 1 and 2 is a bubble generating bathtub,
The bubble generating bathtub (A) has foot side, dorsal side and ventral side jet nozzles (2) (2) according to the present invention on the front and rear walls and left and right side walls of the bathtub body (1) formed in a box shape with an opening on the top. ) (
3) (3) (4) A total of six (4) are provided.

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) (
The ventral side jet nozzles (4) (4) are attached to the inclined surface (1°b) on the side facing the rear wall (dorsal side) of 1b), facing toward the center of the rear wall.

In addition, a pump protection case (9) is arranged outside the bubble generating bathtub (A), and inside the case (9),
A circulation pump (P) that circulates bath water and the same pump (P)
A filter (43) that filters the bath water circulated by the filter, and a pump drive motor (M) that drives the pump (P).
and a control unit (C) that controls the drive of the motor (M) and a piezoelectric actuator (Ml) for opening and closing the valve body, which will be described later.
and.

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 connected to the bubble generating bathtub (A).
A bath water suction vibrator (lO) for sending bath water from the circulation pump (P) to the same bathtub (A).
It consists of a bath water bullet delivery vibrator (11) for sending bath water to the body.

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 connected to the water inlet of the circulation pump (P) to suck bath water 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, a pressure detection sensor (not shown) is installed in the middle of the bath water delivery pipe (11) to detect the pressure of the bath water being forced into the vibrator (11), and the detection result from the sensor is installed. is sent to the control section (C), which controls the jetting pressure of the bath water spouted from each jetting nozzle (2), (3), and (4).

Below, foot side, dorsal side, ventral side jet nozzle (2) according to the present invention
(3) The configuration of (4) will be specifically explained.

Each of the jet nozzles (2), (3), and (4) is characterized by being configured to be able to automatically change the jetting amount and jetting pressure of bath water. This will be explained with reference to the configuration of the jet nozzle (2).

That is, the foot side spout nozzle (2) has a cylindrical nozzle casing (20) cantilevered to the outside of the bathtub body (1) at the foot side spout nozzle connection port (1g) of the bathtub body (1). The jet forming part (50) that spouts out the bath water mixed with air bubbles into the nozzle casing (20) and the direction in which the bath water mixed with air bubbles is ejected from the jet forming part (50) are A defined throat portion (60) is arranged and fixed via a decorative cover (26) located on the bathtub body (1) side.

Below, the components of the jet nozzle (2), such as the nozzle casing (20), the decorative cover (26), and the throat part (60), are shown below.
) and the jet flow forming section (50) will be explained individually.

As shown in FIG. 3, the nozzle casing (20) has its front end connected in communication with the circular foot-side jet nozzle connection port (1g) opened at the lower part of the front wall of the bathtub body (1), and its rear end Distracted horizontally and posteriorly.

Then, fit a ring-shaped gasket (lh) around the periphery of the foot-side spout nozzle connection port (1g), and attach a female thread on the inner peripheral surface to the front surface of the gasket (1h) located inside the bathtub body (1). Attach the rear surface of the ring-shaped female threaded part (11) formed with
The same ring-shaped "female thread part (11) is attached to the nozzle casing (
An outer peripheral male threaded portion (20a) formed on the outer peripheral surface of the front end of the
) to the same nozzle casing (20).
is attached to the front wall of the bathtub body (1) substantially perpendicularly and in a watertight manner.

Further, the decorative cover (26) has a cylindrical overall shape, a female threaded portion (26a) is formed on the outer peripheral surface, and a releasable threaded portion (26).
a) is removably screwed onto the inner circumferential male threaded part (20H) formed on the inner circumferential surface of the front end of the nozzle casing (20), and the front end (26b) of the decorative cover (26) is brought into an inner and outer overlapping state. Along the front end of the screwed nozzle casing (20) and the front end of the ring-shaped female threaded part (11), the ring-shaped female threaded part (11) is extended in a folded manner to the outer circumferential surface of the ring-shaped female threaded part (11). 28b) covers the front end of the nozzle casing (20) and the ring-shaped female screw part (11), and the throat fixing member (25) described later is attached to the rear end of the decorative cover (2B).
is fixed.

Further, as shown in FIGS. 4 and 5, an intake vibe connecting portion (20) is provided on the central peripheral wall of the nozzle casing (20)
b) is opened, and the other end of an intake vibrator (12), one end of which is connected to the air intake part (5) (see Fig. 1), is removably connected to the connection part (20b). .

In addition, a third
As shown in the figure and FIG.
A bath water bullet conveying vibrator (11) is removably connected to the body (see Fig. 1). (n) indicates the bath water inflow direction.

Further, the throat portion (60) is composed of a throat (24), a throat fixing member (25) that supports the throat (24) in an adjustable manner, and a front portion of the valve seat forming cylinder (21). ing.

The throat (24) has a base (24a) having a spherical outer circumference, and the base (24a) is connected to the inner circumference of the throat fixing member (25) and the inner circumference of the valve seat forming cylinder (21). Throat support surfaces (25a) (21b) formed on the respective surfaces.
) is slidably fitted in surface contact with the base (2
A cylindrical tip (24b) with a smaller outer diameter than 4a)
The distal end portion (24b) is made to protrude forward, and the distal end portion (24b) can be manually adjusted to swing in any direction up, down, left, or right around the base (24a).

Moreover, a certain sliding resistance acts on the base (24a) of the throat (24) from the throat support surfaces (25a) (21b), making it possible to stop the throat (24) at any swing angle. .

The base (24a) of the throat (24) is fitted onto the throat support surface (21b), and the top (24°a)
) is located on the same vertical plane as the front end surface of the valve seat forming cylinder (21), and from the center of the base (24a) to the rear end surface (2
4°b) to approximately half the radius of the base (24a), so that the throat support surface (21b
) can be easily fitted into the throat base (24a).

Moreover, the base (24a) of the throat (24) has an inner circumferential surface of the front half having substantially the same diameter as the inner diameter of the distal end (24b), and an inner circumferential surface of the substantially rear half having an enlarged diameter toward the rear. Base (2
4a) The diameter between the rear ends is made larger than the inner diameter of the valve seat forming cylinder (21), and when adjusting the swing of the throat (24),
This allows the hot water to flow smoothly into the throat (24) from the valve seat-forming cylindrical body (21).

Furthermore, the tip (24b) of the throw (24) extends its tip surface to the vicinity of the front end surface located inside the bathtub body (1) of the decorative cover (2B), and the outer peripheral surface of the tip (24b) A throat swinging operation space (28) is formed between the decorative cover (26) and the inner circumferential surface thereof.

The throat swinging operation space (28) is
The throat (24) is formed in a size that allows the bather to swing the throat (24) in any direction by pinching the tip (24b) of the throat (24).

Further, the throat fixing member (25) fits into the front inner peripheral surface of the nozzle casing (20) via the positioning groove,
The front surface (25b) is fixed to the rear end of the decorative cover (26) via the fixing ring (28), and the inner circumferential surface (25a) corresponds to the front spherical surface of the base (24a) of (24). The inner peripheral surface (25a) supports the front outer peripheral surface of the base (24a) of the throat (24) in slidable surface contact.

In addition, the valve seat forming cylindrical body (2) is the nozzle casing (2).
0) into the central part of the nozzle casing (20) through the front end opening of the nozzle casing (20) so that the rear end surface is located near the bullet-feeding vibe connecting part (20e), and is formed on the front outer circumferential surface. The protruding stepped portion (21b) is attached to the nozzle casing (20).
engages with a concave step (201) formed on the inner circumferential surface of the slider to restrict backward sliding and rotation around the axis;
Jet flow forming part (50) provided in the valve seat forming cylinder (21) and air mixing part (70) provided in the nozzle casing (zO)
Aligning with.

A throat support surface (21c) having a concave spherical surface corresponding to the rear spherical surface of the base (24a) of the throat (24) is formed on the front inner circumferential surface of the valve seat forming cylinder (21). The throat (21c) is attached to the throat (21c) as described above.
The base (24a) of the throat (24) is fitted in surface contact with the base (24a) of the throat (24), whose forward sliding is regulated by the throat fixing member (25). 21) is restricted from sliding forward.

In addition, the jet flow forming part (50), which is a main part of the present invention, is an air mixing part (70) provided in the middle part of the valve seat forming cylinder (21).
, a valve seat (21a) forming a jet flow forming flow path (27) immediately behind the air mixing part (70), and the valve seat (21a)
a), a valve body (22) for adjusting the jet flow rate that opens and closes the jet flow forming channel (27), and a piezoelectric actuator (22) for opening and closing the valve body that opens and closes the valve body (22) for adjusting the jet flow rate;
Ml) and a rear wall forming plate (29) that supports the same piezoelectric actuator (Ml).

As shown in FIG. 4 and FIG. An air inflow path (21d) is formed, and the air inflow path (21d)
The inner intake vibe connecting part (20b) side and the connecting part (20b)
Air inlet (21e) on the side opposite b)
(21f) and the same air inlet (21e) (21
f) Connect the inside of the valve seat forming cylinder (21) and the intake vibe connecting part (20b) through the inside of the valve seat forming cylinder (21).
) is formed with an air entrainment section (70). (ffl)
indicates the air inflow direction.

Further, a valve seat (21a) is provided coaxially with the valve seat forming cylinder (21) in the middle part of the valve seat forming cylinder (21) located immediately behind the air mixing part (70), and the valve seat A jet flow forming channel (27) is formed on the axis of the valve seat (2ta).
1, a) A right-angled corner (21'a) is formed on the inner peripheral edge of the rear end, and an inclined surface (22a) is formed on the outer peripheral edge of the tip at the same corner (21°a). The control valve body (22) is brought into contact with and separated from the control valve body (22), so that the amount of opening and closing of the jet flow forming flow path (27) (adjusting the jet flow rate and jet pressure) can be adjusted by the same valve body (22) for adjusting the jet flow rate. ing.

In addition, the piezoelectric actuator (Ml) for opening and closing the valve body has a valve body support rod (23d) that is movable in the axial direction inside a cylindrical case (d) having a rear wall (b), Ring-shaped piezoelectric elements (e), (f), and (g) for clamping and stroke are provided surrounding the valve body support rod (23d).

Then, inside the case (d), the nozzle casing (
A holder (H) is fixed to the rear wall forming plate (29) provided in 20), a rod insertion hole (h) is bored in the holder (H), and a valve body support rod (23d) is inserted through the holder (H). Then, the base end of the clamp member (k) is fixed to the negative side of the holder (H), and a piezoelectric element (e) for rod clamping is attached to the tip of the clamp member (k).
) are installed consecutively.

In addition, the - side of the piezoelectric element for stroke (g) is fixed on the other side of the holder (H), and a cylindrical inner part is attached to the inner periphery of the rod insertion hole (h) of the holder (H). A cylinder (1) is provided protrudingly, and an outer cylinder (0) formed on the negative side of the clamp member holder (j) is slidably fitted onto the inner cylinder (1), and the clamp member holder (H Fix the other side of the stroke piezoelectric element (g) to the same clamp member holder (j), and attach the clamp member (
The base end of the clamp member (q) is fixed, and a piezoelectric element (f) for clamping is connected to the tip of the clamp member (q).

Further, a protrusion (r) is provided around the inner peripheral surface of the tip end of the inner cylinder (1) to guide the valve body support rod (23d).

Next, the structure and operation of each piezoelectric element (e), (f), and (g) will be explained.

Each piezoelectric element (e) (f) (g) is constructed by laminating and bonding a large number of piezoelectric element pieces formed in a ring shape through a conductive adhesive such as silver paste, and is a piezoelectric element for clamping. In (e) and (f'), the valve body support rod (23d) is clamped with a constant clamping force in the natural state, and when a negative voltage is applied, the diameter expands and the clamping force disappears, and when a positive voltage is applied, It is configured to reduce its diameter and clamp the valve body support rod (23d).

On the other hand, the stroke piezoelectric element (g) is configured to contract in the axial direction on the valve body support rod (23d) when a negative voltage is applied, and to expand when a positive voltage is applied.

The material of each piezoelectric element piece is, for example, a ferroelectric material having an ABO perovskite crystal structure, such as PZT.
(Pb (Zr, Ti)0 ) system, PLZT (P
b, La(Zr,Ti)0 ] system, PT(PbTiO
) type or three-component type piezoelectric ceramics based on PZT, etc. can be used.

As mentioned above, the clamp member has the other side of the stroke piezoelectric element (g) fixed to the cylindrical inner tube (1) protruding from the inner peripheral edge of the rod insertion hole (h) of the holder (H). Holder (
An outer cylinder (o) formed on one side of D is slidably fitted,
The inner cylinder (1) and the outer cylinder (o) are fitted in a so-called spigot shape, and the stroke piezoelectric element (g
) by gluing the piezoelectric element for the stroke (
g), clamp member holder (j), clamp member (q)
Also, it is possible to easily align the axis of the piezoelectric element (f) for clamping, and to improve assembly accuracy.

In addition, since the stroke piezoelectric element (g) operates using the inner cylinder (1) as a guide, the clamp member holder (j) to which the other side of the piezoelectric element (g) is fixed also operates precisely on the axis. Therefore, the piezoelectric element (f) for clamping and the clamping member (q) are operated accurately on the axis to ensure accurate operation of the piezoelectric actuator (Ml), and to drive the same piezoelectric actuator (Ml). efficiency can be increased.

In addition, since the valve body support rod (23d) is guided by the protrusion (") provided on the inner circumferential surface of the inner cylinder (1), the operation of the valve body support rod (23d) also becomes accurate and smooth.

In addition, a piezoelectric actuator (Ml
) includes the piezoelectric element (e).
(f') A memory storing the driving program of (g) is provided.

Further, the tip of the valve body support rod (23d) is connected to a rod insertion hole (29) provided in the center of the rear wall forming plate (29), which will be described later.
e) It penetrates through the nozzle casing (20) and extends into the nozzle casing (20), and a valve body (22) for adjusting the jetting amount is attached to the tip of the valve body support rod (28d).

Further, at the rear end of the valve body support rod (23d), there is provided a valve body (22 ) is installed with a valve body reference position detection sensor (23r) that detects the opening/closing amount (adjusts the ejection amount and ejection pressure) of the
31) and a reference position detection magnet (230) attached to the rear end position of the valve body support rod (23d) facing the reference position Hall element (23i).

The valve body reference position detection sensor (23f) includes a reference position Hall element (231) and a reference position detection magnet (
23D is converted into an electrical change and sent to the control unit (C), which detects a reference position (for example, a fully closed position) and controls the piezoelectric actuator (Ml). The number of times the voltage is applied from the reference position is calculated.

Next, regarding the movement of the valve body support rod (23d) by the actuator (A) having such a configuration, FIGS.
This will be explained with reference to FIG.

When a drive signal is input to the control unit (C), a positive voltage is applied to the piezoelectric element (1') to move the valve body support rod (23d) according to the drive sequence program read from the memory, as shown in FIG. Clamp the valve body support rod (23d) by applying a negative voltage to the piezoelectric element (e).

Next, as shown in FIG. 7, when the application of the negative voltage to the piezoelectric element (g) is released and the piezoelectric element (g) is contracted, the piezoelectric element (g) moves in the direction of the arrow, and along with this, the piezoelectric element (f' ) also moves in the direction of the arrow.

Thereafter, as shown in FIG. 8, a positive voltage is applied to the piezoelectric element <e> to clamp the valve body support rod (23d), and a negative voltage is applied to the piezoelectric element (f) to clamp the valve body support rod (23d). 23
d) Release the clamp on.

Then, when a positive voltage is applied to the piezoelectric element (g) and it is stretched,
As shown in FIG. 9, only the piezoelectric element (f') moves in the direction of the arrow and returns to the state shown in FIG. 6.

Thereafter, by repeating the above operation, the valve body support rod (23d) can be moved in a straight shape with a stroke on the μm order or sub-μm order, and the valve body support rod (23d) can be attached to the tip of the valve body support rod (23d). The spout amount adjusting valve body (22) is brought into contact with and separated from the valve seat (2■a), and the bathtub body (1
) allows fine adjustment of the amount and pressure of hot water jetted into the bathtub.

Further, a waterproof cover (40
) is installed. This waterproof cover (40) surrounds the tip of the valve body support rod (23d) and extends from the valve body support rod (23d).
Motor for opening/closing the valve body via the surface of 23d) (old)
This is provided to prevent water from entering the
An attachment plunger (30) provided on the peripheral edge of the rear end is attached to the front surface of the rear wall forming plate (29) in the nozzle casing (20) in a watertight manner.

The waterproof cover (40) is attached to the valve body support rod (23).
It is configured in a bellows shape so that it can expand and contract in the front and back direction in conjunction with the forward and backward movement of d).

Further, the above-mentioned valve body (22) for regulating the ejection amount, which is integrally formed with the waterproof cover (40), is molded from synthetic resin such as polytetrafluoroethylene or nylon 11 in this embodiment.

Further, (44) is a cover for preventing hair from getting caught in the bellows-shaped waterproof cover (40), and the cover (44) is used for installation. It can also be detachably attached to the flange (30) and removed when unnecessary. Also, (20m) is an air breathing port.

Further, the rear wall of the nozzle casing (20) described above is a rear wall forming plate (29) that is separate from the nozzle casing (20).
), and the rear wall forming plate (29) has a disc shape with approximately the same diameter as the rear end inner diameter of the nozzle casing (20), and is attached from the front end opening of the nozzle casing (20). It is fitted and installed in a removable manner.

Then, the rear wall forming plate (29) is attached to the nozzle casing (29).
0) Rear wall forming plate regulating piece (20g) formed on the inner peripheral surface of the rear end
) to restrict rearward sliding by abutting and locking the rear peripheral edge, and at the same time, the front surface Sliding forward is restricted by abutting and locking the peripheral edge. (29a) is a packing provided on the peripheral surface of the rear wall forming plate (29).

Moreover, the outer diameter of the motor casing (23) described above is
It is formed to have a smaller diameter than the inner diameter of the rear end opening (20k) of the nozzle casing (20) formed by the inner peripheral surface of the rear wall forming plate (29).

With this configuration, the rear wall forming plate (29) can be attached to the nozzle casing (20) by removing the valve seat forming cylinder (21) that restricts forward sliding of the rear wall forming plate (29). It can be removed from the front end opening of the
The valve body opening/closing motor (Ml) attached to 9) has a smaller diameter than the inner diameter of the rear end opening (20k) of the nozzle casing (20), so it is removed integrally with the rear wall forming plate (29). be able to.

The piezoelectric actuator (Ml) for opening and closing the valve body can be removed from the rear wall forming plate (29) outside the bathtub body (1) if necessary.

Further, the other jet nozzles (3) and (4) are constructed in the same manner as the jet nozzle (2), so that the jet amount and jet pressure of bath water can be finely adjusted.

Further, the jet nozzles (2), (3), and (4) can be adjusted by a motor controller (30) (see FIG. 1).

Furthermore, as shown in FIG. 10, the air intake section (5) described above communicates the negative ends of the intake vibes (12) with the front and rear walls of the intake vibe connection section (83) provided at the center of the bottom surface, respectively. The air intake section (5) is connected to the intake vibe connection section (83
) to each intake pipe (12) (12),
Each jet nozzle (2) from each intake pipe (12) (12)
(3) Air can be supplied to (4).

In Fig. 7, (84) beam actance type silencer, (
Reference numeral 85) is a check valve that prevents the bath water from flowing backward through the intake pipe (12).

(f) Effects In the present invention, the spout nozzle is provided with a motor for opening and closing the valve body, and the motor for opening and closing the valve body adjusts the degree of opening and closing of the valve body for adjusting the spout amount, thereby adjusting the spout volume and amount of bath water. Since the ejection pressure can be changed automatically, no trouble arises even when there are a plurality of such ejection nozzles.

In addition, while the bath water is spouting out, the opening and closing degree of the valve body can be adjusted using the valve body opening/closing motor, and the amount and pressure of the bath water being spouted can be automatically changed. Settings for the amount and pressure of hot water can be changed quickly and reliably.

Moreover, by using a piezoelectric actuator as a motor for opening and closing the valve body for controlling the jet amount, the valve body for controlling the jet amount can be driven steplessly over a minute distance. Since the opening/closing degree of the water jet can be finely adjusted, the amount of hot water spouted from the spout nozzle into the bathtub body can be adjusted.
The jetting pressure can be finely adjusted, allowing bathers to enjoy the desired jetting amount and jetting pressure of bath water.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a bubble-generating bathtub equipped with a jet nozzle according to the present invention. FIG. 2 is a plan view of the bubble-generating bathtub. FIG. 3 is an enlarged sectional view of the jet nozzle. FIG. 4 is a rear view of the same jet nozzle. FIG. 5 is a sectional view taken along the line II in FIG. 3. 6 to 9 are explanatory diagrams of the operation of the piezoelectric actuator. FIG. 10 is an explanatory diagram of the intake pipe. (A) (P) (Ml) (C) Bubble generation Bathtub circulation pump Piezoelectric actuator control unit Bathtub body Leg side spout nozzle Back spout nozzle Ventral spout nozzle Bath water suction vibe Bath hot water bullet sending vibe

Claims (1)

[Claims] 1) A jet nozzle that is attached to the bathtub body and spouts bubble-mixed bath water into the bathtub body is connected to at least a nozzle casing, a valve seat that forms a jet flow flow path, and a jet flow formed by moving in contact with and separating from the valve seat. It consists of a valve body for adjusting the jetting amount that opens and closes the flow path, and a piezoelectric actuator for opening and closing the valve disc that opens and closes the valve plug steplessly over a minute distance, and controls the jetting amount and jetting of bath water. The ejection nozzle structure of the bubble generating bathtub allows fine adjustment of the pressure.