JPH02211155A - Reverse flow preventing structure for suction air pipe in bubble generating bathtub - Google Patents

Abstract

PURPOSE:To prevent a reverse flow of bathtub water into a branch pipe from each jet nozzle by providing a check valve in a halfway part of each branch pipe between a plurality of the jet nozzles and one air intake part. CONSTITUTION:Between an air intake part 5 and each jet nozzle 2, 3, 4, a suction air pipe 12 is interposed forming from its halfway part toward each jet nozzle 2, 3, 4 branch pipes 12a, 12b, 12c, and their point end is connected communicating respectively with the jet nozzles 2, 3, 4. The branch pipes 12a to 12c interpose in their halfway part removably a joint pipe 62 spreading its internal contour from the internal diameter of these pipes 12a to 12b, and a check valve 52 is mounted in the pipe 62. A valve main unit 55 is normally pressed by its own weight and air, fluidized in the branch pipes 12a to 12c, opening an air flow path 12g, but a reverse flow of bathtub hot water, when it is generated from the jet nozzles 2 to 4 in the branch pipes 12a to 12c, brings the valve main unit 55 into contact with a valve seat 53a closing the air flow path 12g, so that the reverse flow of the bathtub hot water is prevented from its inflow to the upstream side of the brance pipes 12a to 12c from the valve main unit 55.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a structure for preventing backflow of an intake pipe in a bubble-generating bathtub.

(Ron, Conventional Technology) Conventionally, as a form of bubble-generating bathtub, a plurality of jet nozzles are attached to the bathtub body, and an air intake part is connected to each jet nozzle through an intake vibrator. The air taken in is sucked through the suction vibrator into each jet nozzle using the negative pressure generated when the bath water is spouted, and the air is mixed into the spouted bath water to jet out the bath water mixed with air bubbles. There is something I did.

The intake vibrator has a midway portion branched by the number of ejection nozzles to form a branch pipe, and the ends of each branched vibe are connected to the ejection nozzles, respectively.

(C) Problem to be Solved by the Invention However, in the case of the above-mentioned intake pipe, when at least one spout nozzle is spouting bath water mixed with air bubbles, it is difficult to use any other spout nozzle. When the jet nozzle is stopped, the negative pressure inside the jet nozzle in use causes the bath water in the bathtub body to flow backwards from the stopped jet nozzle through the branch pipe, reducing the amount of air flowing into the jet nozzle in use. There was a problem in that the amount of air bubbles mixed into the gushing bath water was reduced, and the pine surge effect due to the air bubbles could not be obtained.

Further, there is also a problem in that the bath water that flows backward flows into the air intake part, making it impossible to take in air from the air intake part.

(d) Means for Solving the Problem Therefore, in the present invention, branch pipes equal in number to the number of jet nozzles are formed from the middle part between a plurality of jet nozzles attached to the bathtub body and one air intake part. The air taken in from the air intake part is sent through each branch vibe of the intake pipe to each jet nozzle by interposing the air intake vibrator in a communicating state.
Each spout nozzle is configured to be able to spout bath water mixed with air bubbles into the bathtub body, and a check valve is provided in the middle of each branch pipe to prevent the bath water from flowing backwards from each spout nozzle into the branch vibe. It is an object of the present invention to provide a structure for preventing the backflow of an air suction vibrator in a bubble generation bathtub.

In addition, the check valve has a valve seat provided on the inner circumferential surface of the midway part of the branch pipe, an umbrella-shaped valve body whose peripheral edge approaches and separates from the jet nozzle side of the valve seat, and which opens and closes the inside of the branch vibe. The check valve is constructed of a valve body support section that is installed in the middle of the pipe and supports the valve body so that it can move forward and backward; Another feature is that it is composed of a floating ball as a valve body that contacts the valve seat and closes the inside of the branch vibe by the buoyancy of the bathwater flowing back into the branch vibe.

(e) Embodiment First, the overall structure of a bubble-generating bathtub equipped with an air intake section according to the present invention will be explained based on the accompanying drawings.

(A) shown in FIGS. 1 and 2 is a bubble generating bathtub,
The bubble-generating bathtub (A) has a box-shaped bathtub body (1) with an opening on the top, and has jet nozzles (2) on the front, left, and right side walls of the bathtub body (1) on the foot, dorsal, and ventral sides, respectively. 2) (3) (3
) (4) There are a total of six (4).

The bathtub main body (1) has a flange-shaped edge (la) with a constant width around one periphery, and an air intake portion (la) at the edge (la).
5), and four vertically elongated portions (tb) (lb) with a substantially V-shaped cross section are formed at approximately the center of the left and right side walls, and the same recessed portions (1b) (
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 protective case (9) is arranged outside the bubble generating bathtub (^), 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 driving of the motor CM), a motor (M1) for opening and closing the valve body for a nozzle, and a motor (M2) for opening and closing the valve body for adjusting the amount of air bubbles, which will be described later.

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

In other words, the bath water circulation flow path (D) is a bubble-generating bathtub (^)
A bath water suction vibe (10) for sending bath water from the circulation pump (P) to the circulation pump (P), and from the circulation pump (P) to the bathtub (A).
It consists of a bath water bullet delivery pipe (11) for sending bath water to.

The same bath pigeon suction vibrator (10) is attached 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 intake port of the circulation pump (P) so that the 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, a pressure detection sensor (not shown) for detecting the pressure of the bath water being pumped through the pipe (If) is installed in the middle of the bath water pumping 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).

In addition, the above-mentioned air intake part (5) and each jet nozzle (2)
(3) As shown in Figs. 1 and 3, an intake vibrator (12) is interposed between (3) and (4). (2) (3
) (4) Branch vibe (12a, ) (12b
) (12c), and each branch pipe (12a) (
12b) Connect the tips of (L2c) to each jet nozzle (
2) It is connected to (3) and (4).

Then, using the negative pressure generated when the bath water is spouted from each spout nozzle (2) (3) (4), the air taken in from the air intake part (5) is transferred to each branch pipe ( 12a) (12b) (12c) and into each of the jet nozzles (2), (3), and (4), and from each jet nozzle (2), (3), and (4) into the bathtub body (1). The bath water can be squirted out.

In such a configuration, the gist of the present invention is that each branch pipe (
12a) (12b) (12c) A check valve (52) is provided in the middle of each of the jet nozzles (2) (3).
From (4), each branch pipe (12a) (12b) (
12c) It has a structure that prevents bath water from flowing back into the bath.
This structure will be explained below based on FIGS. 3 to 5.

That is, a joint pipe (62) whose inner diameter is larger than that of the branch pipe (12a) is removably interposed in the middle of the branch pipe (12a).
2) forms a stepped small diameter portion (62a) on the inner peripheral surface of the central portion, and female threaded portions (82b) on the inner peripheral surfaces of both sides.
(62c) and each female threaded part (82b) (8
2e) are screwed into male threaded portions (12d) and (12e) formed on the upstream and downstream sides of the branch pipe (12a), respectively.

(12g) is an air flow path formed within the branch pipe (12a).

A check valve (52) is installed inside the joint vibe (62), and the check valve (52) has a valve seat (53a) at the peripheral edge of the - side and a rod insertion hole (53b) at the center. ), and a valve seat forming plate (53) having an air circulation opening (53e) formed around the rod insertion hole (53b);
A valve body support rod (50) serving as a valve body support portion is inserted into the rod insertion hole (53b) so as to be slidable forward and backward, and a concave center portion is integrally attached to the tip of the valve body support rod (54). An umbrella-shaped valve body whose peripheral edge approaches and separates from the valve seat (53a) in conjunction with the sliding movement of the valve body support rod (54).
55). (54a) is a locking piece for preventing slippage provided at the base end of the valve body support rod (54).

The valve seat forming plate (53) is connected to the branch pipe (12a).
By sandwiching and fixing the peripheral edge between the upstream end surface (12f) of the valve seat forming plate (53) and the upstream end surface (62d) of the stepped small diameter portion (62a) of the joint pipe (62),
) The valve body support rod (54) inserted into the rod insertion hole (53b) moves forward and backward on the axis of the branch pipe (12a), and in conjunction with the valve body support rod (54), the valve body (
55) comes into contact with and separates from the valve seat (53a), and the branch pipe (12
The air flow path (12g) in a) can be opened and closed.

Further, the valve body support rod (54) and the valve body (55) can be integrally molded from elastic rubber or the like.

With this configuration, the valve main body (55) is normally in an open state where it is pushed by its own weight and the air flowing in the branch pipe (12a) to open the air flow path (12g), and the branch pipe (12a) is in an open state. 12a) When the bath water flows backward from the foot side spout nozzle (2), the back flow bath water hits the valve body (55) and the valve seat (53).
a) to close the air flow path (12g), thereby preventing the backflow bath water from flowing into the upstream side of the branch pipe (12a) from the valve body (55). can do.

When performing maintenance on the check valve (52), the check valve (52) can be taken out by removing the joint pipe (62) from the branch pipe (12a). etc. can be done easily.

Further, (56) shown in FIG. 6 is a check valve as another embodiment, and the check valve (56) is connected to the branch pipe (12).
A floating ball accommodating case (58) which movably accommodates a buoyant ball (57) serving as a valve body is removably connected to the midway part, and a valve is connected to the upstream side of the floating ball accommodating case (58). za (5
9), and a floating ball (57) comes into contact with and separates from the valve seat (59), thereby configuring the air flow path (12g) in the branch pipe (12a) to open and close the valve. (63) is a floating ball storage case (5
8) is a floating ball support piece provided on the downstream peripheral surface.

With this configuration, the floating ball (57) is normally in an open state supported by the floating ball support piece (63) due to its own weight and the air flowing in the branch pipe (12a), and the floating ball (57) is in an open state supported by the floating ball support piece (63). (12a) When the bath water flows backward from the foot-side spout nozzle (2) inside, the backflow bath water camo float ball (57) is pushed and the valve seat (
Since the valve is closed by contacting the floating ball (59), it is possible to prevent the backflow bath water from flowing into the upstream side of the branch pipe (12a) rather than the floating ball (57).

Since the check valve (56) is also removable from the branch pipe (12a), maintenance etc. can be easily performed.

Further, the above-mentioned check valves (52) (5B) are similarly attached to the midpoints of other branch pipes (12b) (12c).

Further, configurations other than those described above will be explained as follows.

As shown in FIG. 7, the air intake part (5) is connected to the bathtub body (
1) Open an air intake port (lr) on the edge (1a), and fit the rectangular box-shaped total air intake main body (80) with an opening on the top into the same window air intake mounting port (lri). and a mounting flange (80) formed on the upper edge of the air intake body (80).
a) is secured to the top surface of the periphery of the air intake inlet (IR) and fixed with the mounting bolt (81), and the top opening of the air intake body (80) is connected to the lids of the left and right openings. body(
82), and an air intake port (82a) formed only on the outside of the lid (82) allows communication between outside air and the inside of the entire air intake section body (80).

As shown in FIGS. 3 and 7, an intake vibe connecting portion (83
), and one end of the intake pipe (12) (12) is connected to the front and rear walls of the connecting portion (83), respectively.
The air taken into the whole air intake main body (80) is passed through the intake pipe connecting part (83) to each intake pipe (12) (1
2), and air can be supplied from each intake pipe (12) (12) to each jet nozzle (2) (3) (4).

Moreover, inside the intake vibe connecting portion (83), there is a connecting portion (
83) and the entire air intake body (80) is provided with an air bubble amount adjustment valve (87) for opening and closing the communication path (8G) between Intake body (8
0), a cylindrical valve body (88) having a communicating opening at the bottom;
A motor (M2) for opening and closing the valve body for adjusting the amount of air bubbles attached to the bottom (88a) of the valve body (88),
The valve body support rod (89) attached to the valve body (88) is attached to the tip of the rod (89), and the valve body (90) is attached to the valve seat (gsb) formed on the upper edge of the valve body (88). ).

In addition, the air bubble amount control valve (87) is connected to the intake vibe connecting portion (87).
3) The entire air intake section can be removed from the inside of the main body (80), so that maintenance of the air bubble amount control valve (87) can be performed easily. (ggd) is a communication port provided in the peripheral wall of the valve body (88).

In addition, the motor (M2) for opening and closing the valve body for air bubble Q adjustment uses a linear stepping motor with infinitesimal distance stepless drive, as shown in Fig. 9, and the valve body (88)
A cylindrical motor casing (70) is attached to the bottom (88a) of the
A cylindrical coil (71) is installed coaxially with the valve body (88) in the motor casing (70), and a cylindrical rotor nut (72) is installed in the same coil (72).
73) is concentrically and rotatably mounted via a bearing (74), and a magnet (75) is fitted to the outer peripheral surface of the rotor nut (73) with the coil (71) facing inside and outside, A valve body support rod (89) is inserted into the rotor nut (73) coaxially with the valve body (88).

Then, a large ball-fitting groove (7B) is spirally formed on the outer peripheral surface of the valve body support rod (89), and the ball-fitting groove (7B)
A large number of balls (77) are installed in the interior so that they can be moved freely, and the valve body support rod (89) is moved forward and backward steplessly over minute distances in conjunction with the forward and reverse rotation of the rotor nut (73) via the balls (77). It is configured to work. (78) is a rotation regulating piece that prevents the valve body support rod (89) from rotating with the rotor nut (73).

Moreover, the tip of the valve body support rod (89) is connected to the valve body (89).
8) in the center of the bottom (88a) of the rod insertion hole (
29e) and extends into the valve body (88), and a valve body (90) is attached to the tip of the valve body support rod (89).

Further, at the rear end of the valve body support rod (89), the amount of forward/backward movement of the valve body support rod (89), that is, the opening/closing ff of the valve body (90) due to the forward/backward movement of the valve body support rod (89).
A valve element reference position detection sensor (91) for adjusting the air bubble amount is installed, and the detection sensor (91) is connected to the reference position Hall element (9La) and the same reference position hole. It consists of a reference position detection magnet (91b) attached to the rear end position of the valve body support rod (89) facing the element (91a).

And bubble m:J! Valve body reference position detection sensor for J section (
91) converts the change in magnetic force between the reference position Hall element (9xa) and the reference position detection magnet ((Jib), which changes according to the movement of the valve body support rod (B9) back and forth, into an electrical change. The control unit (C) detects the reference position (for example, the fully open position), and the control unit (C) calculates the number of pulses (rotations) from the reference position of the motor (M2) for opening and closing the valve body for controlling the amount of air bubbles. (91c) is a cord connected to the coil (71a) and the valve element reference position detection sensor (91r) for adjusting the amount of air bubbles.

With this configuration, the motor (M2) for opening/closing the valve body for regulating the amount of bubbles energizes the coil (72) to operate the magnet (
The ball screw (73) is rotated together with the ball screw (75), and the valve body support rod (89) connected to the ball screw (73) is moved forward and backward.
) The valve body (90) attached to the tip of the valve seat (ggb) is brought into and out of contact with the valve seat (ggb), and the air is sucked into each jet nozzle (2)' (3) (4) through the intake vibe (I2). It is possible to adjust the amount of air bubbles mixed into the bath water.

Moreover, the opening/closing amount of the valve body (90) is determined by sending the result of the reference position detected by the valve body reference position detection sensor (91) for adjusting the amount of air bubbles to the control unit <C>, and using this as a reference. C) controls the energization to the coil (72a) to properly open and close the valve body (90), thereby making it possible to finely adjust the amount of bubbles mixed into the spouting bath water.

In addition, the motor (M2) for opening and closing the valve body for adjusting the amount of air bubbles is one that can move the valve element (22) for adjusting the amount of air bubbles steplessly forward and backward over a minute distance to finely adjust the amount of air bubbles mixed into the bath water. Any other piezoelectric actuator may be used, and a piezoelectric actuator may also be used.

In addition, inside the air intake main body (80), there are
As shown in the figure, there are a plurality of silencers (92) formed into a cylindrical shape made of sound absorbing material that has a sound absorbing function and an air purifying function. The silencer support plate (93
) on top of each silencer (
92), the lower end opening (92a) of the silencer support plate (
93) are erected on top at a constant distance from front to back, and the lower end openings (92a) of each silencer (92) are aligned and communicated with the plurality of communication holes (94) provided in the silencer support plate (93), respectively. are doing.

The upper surface of each silencer (92) is closed by a lid (95), and the air intake port (82a) of the lid (82) is closed.
) into the air intake main body (80), passes through the peripheral wall of the silencer (92) and enters the lower end opening (92).
Air is sent to the lower part of the air intake body (80) from a), and is sent to the intake pipe (12) via the air bubble amount control valve (87). (r) indicates the air inflow direction.

In this way, the air taken into the air intake main body (80) can be muffled and purified by passing through the peripheral wall of the silencer (92).

Further, as the sound absorbing material, a porous sintered plastic body such as a sintered polyethylene body or a sintered polypropylene body is used.

In addition, foot side, dorsal side, and ventral side jet nozzles (2) (3) (4)
are characterized in that they are configured to be able to automatically change the jet amount and jet pressure of the bath water, and will be explained below with reference to the configuration of the foot side jet nozzle (2) shown in FIGS. 10 to 12. do.

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). A jet flow forming part (50) which is connected in communication with each other and spouts out bubble-mixed bath water into the nozzle casing (20), and a jet flow direction of the bubble-mixed bath water spouted from the jet flow forming part (50). A defined throat portion (60) is arranged and fixed via a decorative cover (2B) located on the bathtub body (1) side.

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

The nozzle casing (20), as shown in FIG.
The front end is connected in communication with a circular foot-side jet nozzle connection port (Ig) opened at the lower part of the front wall of the bathtub body (1), and the rear end is extended rearward approximately horizontally.

Then, fit a ring-shaped gasket (lh) around the periphery of the foot-side jet nozzle connection port (1g), and attach a female thread on the inner peripheral surface to the front surface of the gasket (lh) located inside the bathtub body (1). Attach the rear surface of the ring-shaped female threaded part (11) formed with
The nozzle casing (2
An outer peripheral male threaded portion (20a) formed on the outer peripheral surface of the front end of 0)
The nozzle casing (20) is removably screwed onto the front wall of the bathtub body (1) in a substantially perpendicular and watertight manner.

Further, the decorative cover (26) has a cylindrical overall shape, has a female threaded portion (26a) formed on the outer peripheral surface, and has a spaced threaded portion (26a) formed on the outer peripheral surface.
a) is removably screwed onto the inner circumferential male threaded portion (20j) 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 placed in the inner and outer overlapping state. along the front end of the nozzle casing (2o) screwed onto the ring-shaped female threaded part (11) and the front end of the ring-shaped female threaded part (11), extending in a folded manner to the outer circumferential surface of the same ring-shaped female threaded part (11). (28b) covers the front end of the nozzle casing (20) and the ring-shaped female threaded portion (11), and the throat fixing member (25), which will be described later, is attached to the rear end of the decorative cover (28).
) is fixed.

Further, as shown in FIGS. 11 and 12, an intake pipe connecting portion (
20b), and the other end of an intake pipe (12), one end of which is connected to the air intake part (5) (see Figure 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 pipe (11) is removably connected thereto (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 surface (25a) (21b), so that the throat (24) can be stopped at any swing angle. There is.

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 the same diameter as the inner diameter of the tip (24b), and an inner circumferential surface of the substantially rear half having an enlarged diameter toward the rear. The rear end opening diameter of the base (24a) is made larger than the inner diameter of the valve seat forming cylinder (21), so that even when adjusting the swing of the throat (24), the throat (24) is smaller than the valve seat forming cylinder (21). 24) so that the hot water can flow smoothly.

Further, the tip end (24b) of the throat (24) extends the tip end surface to the vicinity of the front end surface located inside the bathtub body (1) of the decorative cover (26), and the outer circumferential surface of the end portion (24b) and the makeup A throat swinging operation space (28) is formed between the 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) was fixed to the rear end of the decorative cover (26) via a fixing ring (28e), and the inner circumferential surface (25a) corresponded to the front spherical surface of the base (24a) of the throat (24). It is formed into a concave spherical surface, and the front outer peripheral surface of the base (24a) of the throat (24) is slidably supported by the inner peripheral m (25a) in surface contact.

Further, the valve seat forming cylinder (21) is connected to the nozzle casing (2
0) into the central part of the nozzle casing (20) through the front end opening thereof, so that the rear end surface is located near the bullet feeding pipe connecting part (20c), 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 cylinder to restrict backward sliding and rotation around the axis;
A jet flow forming part (50) provided in the valve seat forming cylinder (21) and an air mixing part (70) provided in the nozzle casing (20)
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.
4) is fitted in surface contact with the base (24a) of the throat (24), and the valve seat forming cylinder is attached to the base (24a) of the throat (24) whose forward sliding is regulated by the throat fixing member (25). The forward sliding movement of the body (21) is restricted.

In addition, the jet flow forming part (50) includes an air mixing part (70) provided in the middle of the valve seat forming cylinder (21), and an air mixing part (70) provided in the middle of the valve seat forming cylinder (21).
A valve seat (21a) that forms a jet flow forming flow path (27) immediately behind the valve seat (21a), and a valve body (21a) for controlling the jet flow rate that opens and closes the jet flow forming flow path (27) by moving toward and away from the valve seat (21a). 22)
It is composed of a nozzle valve body opening/closing motor (M1) that opens and closes the jetting amount regulating valve body (22), and a rear wall forming plate (29) that supports the motor (M1). .

As shown in FIGS. 11 and 12, an annular shape is formed along the outer circumferential surface of the valve seat forming cylinder (21) at a position on the outer circumferential surface of the valve seat forming cylinder (21) perpendicular to the axis of the intake pipe connecting portion (20b). An air inflow path (21d) is formed, and the air inflow path (21d) is
d) on the intake pipe connecting part (20b) side and the connecting part (20b) in
An air inlet (21e) is provided on the side opposite to the air inlet (20b).
) (21f) and the same air inlet (21e) (2
0) Connect the inside of the valve seat forming cylinder (21) and the intake pipe connecting part (20b) through the inside of the valve seat forming cylinder (21).
) is formed with an air entrainment section (70). (m) 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 (21a).
1a) A right-angled corner (21'a) is formed at the inner peripheral edge of the rear end, and an inclined surface (21'a) is formed at the outer peripheral edge of the tip at the same corner (21'a).
The jet flow regulating valve body (22) formed in 22a) is brought into and out of contact, and the jet flow regulating valve body (22) adjusts the opening/closing amount (spray volume and jet pressure) of the jet flow forming channel (27). ) is configured to be adjustable.

In addition, the motor (M1) for opening and closing the valve body for the nozzle has a cylindrical motor casing (23) attached to the rear wall forming plate (29).
The cylindrical coil (23a) is removably attached to the motor casing (23), and the cylindrical coil (23a) is attached to the nozzle casing (23).
A cylindrical rotor nut (23b) is mounted coaxially with the coil (23a) via a bearing (23e) so as to be freely rotatable.
The magnet (23c) is attached to the outer peripheral surface of the coil (23b).
3a), and the valve body support rod (23d) is inserted coaxially with the nozzle casing (20) into the same-port nut (23b).

Then, attach the valve body support rod (23d) to the rotary
In conjunction with the forward and reverse rotation of (23b), the movement is made to advance and retreat steplessly over a minute distance. (23g) is a rotation regulating piece that prevents the valve body support rod (23d) from becoming entangled with the rotor nut (23b).

Moreover, the tip of the valve body support rod (23d) is connected to a rod insertion hole (2) provided in the center of the rear wall forming plate (29), which will be described later.
9e) and extends into the nozzle casing (20), and a jetting amount adjusting valve body (22) is attached to the tip of the valve body support rod (23d).

Further, at the rear end of the valve body support rod (23d), there is provided a valve body (22 ) Nozzle valve body reference position detection sensor (231') that detects the opening/closing amount (adjusts the jetting amount and jetting pressure) of the valve body (231')
is installed, and the valve body reference position detection sensor for the same nozzle (
231') is a motor (
M2) is equipped with a valve body standard position detection sensor (
91).

With this configuration, the motor for opening and closing the valve body for the nozzle (
M1) energizes the coil (23a) and magnet (2
3b, ), the ball screw (23c) is rotated, and the valve body support rod (23d) interlocked with the ball screw (23c) is moved forward and backward, and the ejector attached to the tip of the valve body support rod (23d) is moved forward and backward. Volume adjustment valve body (22
) are moved toward and away from the valve seat (21a) so that the jetting amount and jetting pressure can be adjusted.

Moreover, the opening/closing amount of the ejection amount regulating valve body (22) is as follows:
The result of the reference position detected by the nozzle valve body reference position detection sensor (23r) is sent to the control unit (C), and the control unit (C) controls the energization to the coil (23a) based on the result, The spout amount regulating valve body (22) is opened and closed appropriately to adjust the amount of hot water spouted into the bathtub body (1) and finely adjust the hot water spout pressure.

In addition, the nozzle valve body opening/closing motor (old) is a motor that moves the jet ff1ff valve body (22) steplessly forward and backward over a minute distance to finely adjust the jet amount and jet pressure of bath water. Any other piezoelectric actuator may be used, and a piezoelectric actuator may also be used.

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).
23d) The motor for opening and closing the valve body (M
1), and the mounting flange (30) provided on the periphery 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. Installed in condition.

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 formed integrally with the waterproof cover (40), is molded from a synthetic resin such as polytetrafluoroethylene or nylon 11 in this embodiment.

Further, (44) is a cover for preventing hair from being caught in the bellows-shaped waterproof cover (40), and the opening force' bar (44) is as follows: It can also be detachably attached to the attachment flange (30) and removed when unnecessary. Further, (20I1) 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 a diameter approximately concave to the inner diameter of the rear end 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
9) The motor for opening and closing the valve body for the nozzle (M1
) is the rear end opening (20k) of the nozzle casing (20).
), the rear wall forming plate (29
) and can be removed as an integral part.

In addition, the motor for opening and closing the nozzle valve body (old) may be installed on the outside of the bathtub body (1) by attaching it to the rear wall forming plate (
29) It can also be removed.

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 remote controller (30) (see FIG. 1).

(f) Effects In the present invention, even when at least one ejection nozzle is in use and the use of any other ejection nozzle is stopped, the non-return check provided in the middle of each branch vibrator is The valve prevents the backflow of bath water during any branch vibe, so the amount of air flowing into the jet nozzle during use can be kept constant, and no air is mixed into the jet water. By ensuring a constant amount of air bubbles, it is possible to maintain a good pine surge effect due to the air bubbles.

Furthermore, since backflow of bath water into the air intake section can be reliably prevented, malfunction of the air intake section can also be prevented.

Further, in the present invention, since the valve body of the check valve is configured to be closed by the pressing force or buoyancy of the bath water flowing backward, the structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a bubble-generating bathtub equipped with an intake pipe backflow prevention structure according to the present invention. FIG. 2 is a plan view of the bubble-generating bathtub. FIG. 3 is an explanatory diagram of the piping of the intake vibrator. FIG. 4 is a sectional view of the reversal valve. FIG. 5 is an exploded explanatory view of the same check valve. FIG. 6 is a sectional view of a check valve as another embodiment. FIG. 7 is an enlarged sectional view of the air intake section. FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. FIG. 9 is an enlarged sectional view of the motor for opening and closing the valve body for controlling the amount of air bubbles. FIG. 10 is an enlarged sectional view of a motor for opening and closing a nozzle valve body. FIG. 11 is a rear view of the same jet nozzle. FIG. 12 is a sectional view taken along line I-1 in FIG. 10. (A): Bubble generation bathtub (P): Circulation pump (C) Two control parts (1): Bathtub body (2) Two-leg side spout nozzle (3): Dorsal side spout nozzle (4): Ventral side spout nozzle ( 5): Air intake part (10): Bath water suction vibe (11): Bath water bullet feed vibe (12): Intake pipe (52) (58): Check valve

Claims (1)

[Scope of Claims] 1) An intake pipe in which branch pipes corresponding to the number of jet nozzles are formed from the middle part is interposed between a plurality of jet nozzles attached to the bathtub body and one air intake part in communication with each other. The structure is configured so that the air taken in from the air intake part can be sent through each branch pipe of the intake pipe to each spout nozzle, and bath water mixed with bubbles can be spouted from each spout nozzle into the bathtub body. A structure for preventing backflow of an intake pipe in a bubble-generating bathtub, which is provided with a check valve in the middle to prevent bathwater from flowing back into the branch pipe from each jet nozzle. 2) The check valve according to claim 1 has a valve seat provided on the inner circumferential surface of a midway part of the branch pipe, and an umbrella-shaped valve seat whose peripheral edge approaches and separates from the jet nozzle side to open and close the branch pipe. A structure for preventing backflow of an intake pipe in a bubble-generating bathtub, characterized by comprising a valve body and a valve body support part installed in the middle of a branch pipe and supporting the valve body so as to move forward and backward. 3) The check valve according to claim 1 has a valve seat provided on the inner circumferential surface of the middle part of the branch pipe, and the valve seat is contacted with the valve seat by the buoyancy of the bath water that flows back into the branch pipe from the jet nozzle and flows inside the branch pipe. A structure for preventing backflow of an intake pipe in a bubble-generating bathtub, characterized by comprising a floating ball as a closing valve body.