JPH02309952A - Muffling structure in air intake part of bubble generating bathtub - Google Patents

Abstract

PURPOSE:To decrease noise at the time of sucking air by providing a muffling pipe whose diameter is smaller than the diameter of a flow passage in the middle of an air flow passage in an air intake part. CONSTITUTION:An air intake part is constituted mainly of a suction case 20 formed in a box type of a roughly rectangular shape, and an air flow passage L of its inside is partitioned into three pieces of chambers by a vertical bulkhead 22, and they become air expansion chambers 23-25. Also, on the upper part of each air expansion chamber 23-25, the upper partition plate 26 and the lower partition plate 27 are provided horizontally by holding a prescribed interval, and on the partition plates 26, 27, the upper muffling pipe 28 and the lower muffling pipe 29 are provided vertically, respectively. That is, since the muffling pipes 28, 29 are formed so that its diameter becomes smaller than that of the flow passage L, a suction sound at the time of sucking air is diffused and expanded to the air expansion chambers 23-25 of a large capacity, and the acoustic energy strength is weakened. In such a way, the sound reduction can be attained extending over a wide frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a sound deadening structure in an air intake section of a bubble-generating bathtub.

(B) Conventional technology Conventionally, as described in Japanese Patent Application Laid-Open No. 59-135058, a bubble-generating bathtub has a bath water suction system between the bathtub body and a circulation pump installed outside the bathtub body. A bath water circulation flow path consisting of a pipe and a forced bath water supply pipe is provided, and an air intake part is provided in the middle of the hot water forced flow pipe. Some bathtubs are designed to eject water from a nozzle into the bathtub body, and simultaneously mix it with air sucked in from an air intake to eject bathwater mixed with bubbles.

(c) Problems to be Solved by the Invention As described above, a bubble-generating bathtub always requires an air intake part, and the air intake part is opened at a predetermined location so that air can be inhaled. Noise occurs when inhaling,
Particularly in a narrow bathroom, noise reverberates and is amplified, making it necessary to take measures against noise when air is inhaled.

(d) Means for Solving the Problems In this invention, a bath water circulation flow path consisting of a bath water suction pipe and a bath water forced delivery pipe is provided between a bathtub body and a circulation pump installed outside the bathtub body. A plurality of terminal ends of the forced bath water pipe are opened into the bathtub body to form a spout nozzle, and an air intake part is connected to the bath water post pipe so that air bubbles are mixed from the spout nozzle. In a bubble-generating bathtub configured to be able to squirt bath water into the bathtub body, a noise-reducing pipe with a diameter smaller than the diameter of the air flow path is interposed in the middle of the air flow path in the air intake section. The purpose is to provide a sound deadening structure at the intake part.

(E) Function/Effect In this invention, when taking a bath in a bubble-generating bathtub, bathing is performed by operating an operation panel provided at the edge of the bathtub body to obtain a jet of bubbles. In particular, by operating the operation panel section, air is taken in from the air intake section, and the bubble-generating bath water jet is activated.

At this time, a noise-reducing pipe with a diameter smaller than the diameter of the air flow path was interposed in the middle of the air flow path in the air intake section, so when the air enters the large-diameter air flow path from the sound-reducing pipe, the noise during air intake will be reduced. The system expands the sound waves in a large diameter air flow passage, dilutes the acoustic energy intensity, and further narrows the sound through the same passage to effectively reduce sound. Since sound can be reduced over a specific frequency range depending on the dimensions of the flow passage and the dimensions of the muffling pipe, it is possible to specifically select and muffle the noise during air intake, and this noise reduction also reduces the pressure loss when air flows in, making it more compact. This allows for a compact structure, and there is no need to take up a large space for installation when installing it on the bathtub body.
It functions effectively to save space between the bathroom and the bathtub body.

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

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

The bathtub body (1) has a flange-like edge (la) of a constant width formed on the periphery, and an air intake portion (5) on the edge (la).
), and a vertically elongated recess (lb) (lb) with an approximately V-shaped cross section is formed approximately at the center of the left and right side walls, and the recess (lb) (
The ventral side jet nozzle (4) (4) is attached to the inclined surface on the side facing the rear wall (dorsal side) of tb), facing toward the center of the rear wall.

Moreover, the ventral side jet nozzle (4) is installed at a higher position than the other leg side and dorsal side jet nozzles (2) and (3) to ensure that bath water reaches the ventral side, chest side, and other parts of the human body. I am trying to make it possible to apply it to.

In addition, a pump protective case (6) is arranged outside the bubble generating bath tff (A), and inside the case (6) there is a circulation pump (P) that circulates the bath water, and a pump that circulates the bath water. A filter (F) filters the bath water circulated by (P), and a pump drive motor (F) that drives the same pump (P).
M), and a control unit (C) that controls the drive of the motor (M), a motor for opening and closing the valve body for the nozzle, a motor for opening and closing the valve body for adjusting the amount of air bubbles, and the electric three-way valve (45). There is.

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

That is, the bath water circulation flow path includes a bath water suction pipe (7) for sending bath water from the bubble generating bathtub (A) to the circulation pump (P).
) and a forced bath water pipe (8) for sending bath water from the circulation pump (P) to the bathtub (A).

The bath water suction pipe (7) has one end connected to the suction port (9) opened at the bottom of the bathtub body (1), and the other end connected to the water suction port of the circulation pump (P). Circulation pump (
While the bath water is sucked into the bath water bullet pipe (P),
8) has one end connected to the water outlet of the circulation pump (P), and the other end connected to the jet nozzles (2), (3), and (4), respectively.

Further, the above-mentioned suction port (9) is provided at a lower position than the foot side/dorsal side jet nozzles (2) and (3).

In addition, an inverter is interposed between the pump drive motor (M) that drives the circulation pump (P) and the control unit (C), and the output frequency of the inverter is changed to control the circulation pump (P). By controlling the rotation speed, the strength of the jet flow,
By changing the speed and creating many variations of jet shapes, the fun of bubble jets is increased.

In addition, in the middle of the forced bath water pipe (8), the same pipe (
8) Attach a pressure detection sensor to detect the pressure of the bath water being pumped inside, and send the detection result from the sensor to the control unit (C).
The control unit (C) controls each jet nozzle (2) (
3) (4) The spouting pressure of the bath water spouted from , the rotation speed of the pump drive motor (M) and each spout nozzle (2
) (3) It is controlled by changing the opening/closing amount of (4).

In addition, in the middle of the forced bath water pipe (8), the same pipe (
8) Install a bath water temperature detection sensor that detects the temperature of the bath water being pumped through the interior, and control the detection results from the sensor [(C
), and the control unit (C) controls the pump drive motor (M) and each jet nozzle (2), (3), and (4).

In addition, the above-mentioned air intake part (5) and each jet nozzle (2)
(3) As shown in Figure 1, an intake pipe (10) is interposed between the intake pipe (10) and (4).
A branch pipe (11) is formed from the middle part toward each jet nozzle (2), (3), and (4), and each branch pipe (1
1) to each jet nozzle (2) (3) (
4).

Then, by using the negative pressure generated when the bath water is spouted from each of the jet nozzles (2), (3), and (4), the air taken in from the air intake part (5) is transferred to each branch pipe of the intake pipe (10). 11) Through each jet nozzle (2) (3) (4)
The bath water mixed with air bubbles can be spouted into the bathtub body (1) from each spout nozzle (2), (3), and (4).

In addition, as shown in FIG. 1, an operation panel section (12) is provided on the edge (1a) of the bathtub body (1) at the foot-side corner. Creates bubbles in the bathtub (
A) Driving operations can be performed.

In the above-described configuration, the gist of the present invention is to provide a silencer pipe (28) (29) with a diameter smaller than the diameter of the flow path in the middle of the air flow fi'6 (L) in the air intake part (5). It is characterized by the fact that it has been established.

First, we will explain the operation panel section (12) that is integrated with the air intake section (5).
2) is formed into a substantially rectangular shape, and the upper surface is similar to the bathtub body (1).
The opening/closing M (14) is formed on the top surface of the operation panel section (12) so as to cover the operation display section (12-1). It is installed so that it can be opened and closed in any direction.

(15) indicates the pivot of the opening/closing lid (14). Further, the operation display section (12-1) is composed of a flexible thin plate made of synthetic resin, and a push switch mechanism (1B) is provided below the operation display section (12-1). When pressed by the finger, the lower switch mechanism (1B) becomes 0N-
It is configured to be turned OFF and a desired driving operation is performed.

In addition, a molded part (16°) is vertically disposed at the side end of the operation display part (12-1).
16") is configured to protrude downward and is housed together with the suppression switch mechanism (I6) in the switch case (I7), and a lead wire (18) is led out from the molded part (teo) to connect to the connector. (1B-1), and the same lead wire (18
) is connected to the control section (C). (1B-2) shows a pipe that protects the lead wire (18).

Therefore, the mold part (16°) can be replaced by pulling it out from above and separating it from the connector (16-1) part, and it is also sealed with a seal (34) so that the bath water can be placed below the connector (1B-1). It is constructed to prevent water from flowing in and leaking.

In addition, on the outside of the switch case (17), the same case (
An outer case (19) is provided to surround the outer case (17), and there is a certain distance (S) between the periphery of the outer case (19) and the switch case (17) inside the outer case (19). The peripheral edge of the outer case (I9) is configured to fit into the upper edge of an air intake case (20) of an air intake section (5), which will be described later.

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

The air intake section (5) is mainly composed of an intake case (20) formed in a substantially rectangular box shape. That is,
The intake case (20) is open at the top and has an air exhaust hole at the bottom to form an air flow path (L) inside, and the upper edge of the intake case (20) is folded outward to form a flange. (2
1), the upper part of which is open, and the air flow passage (L) that is the interior of the intake case (20) is partitioned into three rooms by a longitudinal partition wall (22). 2.3 Air expansion chambers (23) (24) (25).

Furthermore, an upper partition plate (2B) and a lower partition plate (27) are provided horizontally at a constant interval on the upper part of each air expansion chamber (23), (24), and (25). Board (2B
) (27) has an upper muffling pipe (28) and a lower muffling pipe (29) vertically installed, respectively, so that the upper and lower sides thereof are communicated via the same pipes.

That is, each air expansion chamber is divided into upper expansion chambers (23°) (24°) (25°) by an upper partition plate (26) and a lower partition plate (27).
) and an upper expansion chamber (23") (24") (25").Furthermore, the upper sound deadening pipe (28
) above the intake case (20) and the upper expansion chamber (23°
)(24')(25'), and the upper expansion chambers (23°)(24°)(25°
) and the upper expansion chambers (23") (24°') (25") are in communication with each other.
) (29) extends downward, and its lower end is located halfway between each expansion chamber.

That is, the air expansion chamber (2
3) (24) and (25) are formed, and the air expansion chamber is configured such that the space volume is larger on the downstream side of the flow path (L) than on the upstream side of the flow path (L). can be,
The upstream side of the flow corresponds to the upper and lower sound deadening pipes (28) (29), and the downstream side of the flow corresponds to the upper and lower expansion chambers (23°) (23).
”) (24°) (24°') (25°) (25”).

Among the various types of silencers, this corresponds to the so-called expansion-type noise reduction structure, and is used when noise flows from the upper distribution side to the lower distribution side, that is, the upper and lower silencer pipes (2B) (29 ) When air flows into the upper and lower expansion chambers, it expands the sound waves, dilutes the acoustic energy intensity, and constricts it at the ends of the chamber, thereby increasing the volume reduction (dB).

In the present invention, in the schematic diagram shown in FIG. 6, the maximum volume reduction is -D2/D1x4dB, and the frequency is 40011
In the region from z to 5KIIz, g of 88gv (natural frequency 1.25KH2) produced the most efficient noise reduction effect.

In other words, by adopting a structure in which a part of the muffling pipe is inserted into the air expansion chamber, the attenuation characteristics of D2/D I Since the length is determined by the length g), the length ff) was determined to achieve the most efficient attenuation according to the frequency characteristics of the noise. Furthermore, there are noise-reducing pipes (28) (2
9) has the best protrusion length of ff/2.

In particular, when the airflow passage (L) was of the open type shown in FIG. 7, the highest noise value (dB) was recorded at 71.5 dB in the frequency range of 400,112 to 5 KHz.

On the other hand, the one-stage expansion chamber type shown in FIG. The two-stage expansion chamber type shown in Figure 8) also had a noise value of 58 dB, with almost no difference in noise value.

However, the two-stage expansion chamber type of the present invention lowers the overall noise level compared to the one-stage expansion chamber type, and at the same time has an effective damping effect on noise frequencies that were less reduced in volume with the one-stage expansion chamber type. Ta.

Furthermore, it is also effective in securing the amount of air inflow, and a sufficient intake function can be achieved without reducing the noise damping function.

In this way, the structure of the embodiment of the present invention, that is, the upper and lower sound deadening pipes (28) (29) and the upper and lower expansion chambers (23°) (
23") (24°) (24°') (25°) (25°°
), the noise value (dB) was 58 dB, which was almost the same level as the noise caused by air bubbles, achieving a remarkable silencing effect.

The measurement point was located at a constant height of about 1.2 m and about 1 m laterally away from the bathtub body (1).

This location corresponds to the central area in a normal sized bathroom. In addition, during the experiment, measurements were taken in an anechoic chamber in order to understand pure bathroom noise.

As described above, in the present invention, the air intake part (5) can significantly reduce the noise value compared to the open type shown in FIG.

In other words, oven type (Figure 6)...
71.5dB Structure of the present invention (Fig. 8)...
...58 dB The noise value of the structure of the present invention is at the same level as the noise caused by bubbles, and has reached the noise value targeted by the applicant.

Furthermore, the first air expansion chamber (23) and the third air expansion chamber (23) on both sides of the case
At the lower end of the air expansion chamber (25), a first
A third air discharge hole (30) (31) is provided,
Further, in the middle lower part of the case, a second air expansion chamber (24) is extended to a position lower than the first and third air expansion chambers (23) and (25), and left and right air exhaust holes are provided on both sides of the lower end of the second air expansion chamber (24). (32) (33) is provided, so the first
The vertical positional relationship between the third air exhaust hole (30) (31) and the left and right air exhaust holes (32) (33) is such that the latter is located lower than the former.

This is because the intake pipes (10) communicating with each air exhaust hole are not located on the same plane, but are located one above the other so that they do not overlap.

In addition, each of the muffling pipes (28) and (29) is formed to have a small diameter, so that the intake noise when air is inhaled from the air intake hole (40), which will be described later, is emitted from the muffling pipe (28) and (29) into a large volume space. The air diffuses into the barrel air expansion chambers (23), (24), and expands to expand the sound waves, dilute the acoustic energy intensity, and reduce the sound, making it possible to reduce the sound over a wide range of frequencies.

In addition, the first and third air exhaust holes (30) (31) have
The dorsal and leg side intake pipes (to-1) (10-2) are connected, and the pipes (10-1) (to-2) are
The nozzles (3) and (2) on the back side and the foot side are connected to each other, and are configured to suck and supply air by an ejector function of forming a negative pressure by a jet of bath water.

In addition, the left and right air exhaust holes (32) (33) are equipped with ventral intake pipes (10-3) that are installed on both sides of the bathtub body (1).
), and the same pipe (to-3) is connected to the ventral jet nozzle (4) (4), and the ejector function of the jet of bath water from the nozzle is used to suck in and supply air. I have to.

(20') shows the connector case, and (34) shows the seal between the connector case (20°) and the mold part (1B,').

In addition, the flange (21) on the upper edge of the air intake part (5)
is placed on the periphery of the rectangular hole (35) bored in the edge (1a) of the bathtub body (1), and therefore the air intake part (
The intake case (20) of 5) is connected to the edge (1) of the bathtub body (1).
1a) It is installed vertically below.

An edge frame (36) is attached from the upper end surface to the outer end surface of this flange (21).
6) The flange (21) and the edge (1a) of the bathtub body (1) are integrally fixed and connected by bolts (37) and nuts (38). (39) indicates a sealing member.

Furthermore, the outer peripheral surface of the edge frame (36) is such that the peripheral edge of the outer case (19) of the operation panel section (12) is visible, and therefore, the upper end of the air intake section (5) and The lower end of the operation panel section (I2) is thus fitted and configured to be integrally arranged vertically.

Further, brackets (41) are provided upright on both sides of the flange (21) of the intake case (20), and four parts (42) are provided on both sides of the outer case (19) of the operation panel section (12).
The air intake section is formed by threading bolts (43) from the same four parts (42) into the bracket (4■) to connect and fix the mounting case (20) and the outer case (19) together. (5) and the operation panel section (12) are constructed as integrally as possible, and (44) indicates the lid of the recess (42), which is fitted into the recess (42) to perform the decorative cover and seal function. I am accomplishing it.

Moreover, on the back surface of the outer case (19) of the operation panel section (12), that is, on the elevated vertical back surface of the operation panel section (12) with an inclined upper surface, there are many air intake holes ( 40) is drilled, and the same intake hole (40)
is communicated with the space between the outer case (19) of the operation panel section (12) and the switch case (17), and therefore the space (S ) and the air intake case (2) of the air intake part (5).
0) From the upper end open part, upper muffling pipe (28), upper expansion chamber (23'') (24°) (25°), lower muffling pipe (29), lower expansion chamber (23°') (24°' )(25°
゛) The air is sequentially drawn into the intake pipe (lO) and is configured to be ejected from each ejection nozzle (2), (3), and (4) together with the jet bath water. Furthermore, the locations of the operation panel section (12) and air intake section (5) are as follows:
It is provided at one corner of the foot side of the bathtub body (L), and the intake hole (40) for air intake opens toward the wall, and is therefore located at a certain level above the edge surface of the bathtub. has been done. This is to prevent bath water from flowing in as much as possible.

[Brief explanation of drawings]

FIG. 1 is an overall explanatory diagram of the air intake section noise reduction structure of the bubble generating bathtub of the present invention. FIG. 2 is a sectional front view of the air intake noise reduction structure of the present invention. FIG. 3 is a sectional side view of the same. FIG. 4 is an explanatory cross-sectional view taken along line I-1 in FIG. 2. FIG. 5 is a plan view showing the intake case of the air intake section in the air intake section noise reduction structure of the present invention. FIG. 6 is a schematic diagram of the present invention. Figure 7 shows the conventional structure. FIG. 8 is a schematic diagram of the silencing structure of the present invention. (1): Bathtub body (5): Air intake section (12): Panel section (23): First air expansion chamber (24): Second air expansion chamber (25): Third air expansion chamber (40): Intake hole patent applicant Totokiki Co., Ltd. Representative Ken Matsuo
- Part Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1) A bath water suction pipe (7) and a bath water forced delivery pipe (8) are connected between the bathtub body (1) and a circulation pump (P) installed outside the bathtub body (1). ), and a plurality of terminal ends of the forced bath water pipe (8) are opened into the bathtub body to form spout nozzles (2), (3), and (4). The air intake part (5) is connected to the bath water post-feeding pipe (8), and the bath water mixed with air bubbles is sent from the above-mentioned spout nozzle to the bathtub body (
1) In the bubble-generating bathtub (A) configured to be able to blow air into the air, noise-reducing pipes (28) (29) with a smaller diameter than the diameter of the air flow path are installed in the middle of the air flow path (L) in the air intake section (5). A sound deadening structure in the air intake part of a bubble-generating bathtub, which is constructed by interposing a.