JP2792171B2 - Bubble water flow generator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sucking air into a mixing chamber provided on a pump discharge side by using a discharge water flow of a pump and ejecting a bubble water flow into a bathtub.

2. Description of the Related Art As shown in FIG. 4, a conventional bubble water flow generator of this type sucks warm water from a bathtub 9 with a circulation pump 7 and provides a mixing chamber 4 on the discharge side of the circulation pump 7. The tip is open to the bathtub 9. The mixing chamber 4 has an inlet nozzle 1 and an outlet nozzle 2 having a horizontal axis, and a mixed air suction unit 3 whose axes are orthogonal to the two nozzle axes.
The mixed air suction part 3 has the other end open to the atmosphere via the air inflow pipe 5.

In such a conventional bubble water flow generator, in order to increase the amount of intake air, the area of the mixed air suction part 3 formed by the suction parts of the inlet nozzle 1 and the outlet nozzle 2 is reduced. Need to squeeze. However, if the suction area is too small, the bubble water flow mixed with the jet water flow from the inlet nozzle 1 and the air collides with the outlet nozzle 2 suction part, causing the discharge nozzle 2 to vibrate,
The vibration was transmitted to the entire mixing chamber 4. As a result, part of the vibration energy was transmitted from the mixing chamber 4 to the wall of the bathtub 9 and radiated noise into the bathroom 9. In addition, there is a problem that a part of the sound propagates to the structure through the pipe 8 and emits a vibration sound to an adjacent room or a downstairs.

The present invention has been made to solve the above problems, and has as its object to provide a bubble water flow generator including a large amount of bubbles with low vibration and low noise.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a bubble water flow generating device, in which an inlet nozzle and an outlet nozzle are installed to face each other at a fixed distance, and an outer peripheral portion of the inlet nozzle and the outlet nozzle are provided. A mixed air suction section is formed at the suction section, and the passage area of the mixed air suction section is gradually reduced from the inlet to near the tip of the inlet nozzle,
A suction recess is provided between the outlet nozzle suction portion and the diffuser portion at an outlet nozzle which is downstream from the inlet nozzle tip and forms a fluid passage for the mixed air and a mixed fluid of hot water jetted from the inlet nozzle. The configuration is as follows.

Operation According to the above-described structure, the present invention first injects hot water sucked from the bathtub by the circulation pump to the inlet nozzle to generate a high-speed water flow in the mixing chamber. As a result, the pressure of the mixed air suction portion located on the outer periphery of the inlet nozzle in the mixing chamber becomes negative, and air can be sucked from the air suction pipe. However, in this configuration, since the area of the air suction path is gradually reduced from the inlet portion and minimized near the tip of the inlet nozzle, a large amount of air flows smoothly. Since the suction concave portion provided between the outlet nozzle suction portion and the outlet nozzle diffuser portion serves as a buffer region, collision of the bubble water flow, which is a mixture of air and hot water flowing out from the tip of the inlet nozzle downstream, to the outlet nozzle wall. The vibration of the outlet nozzle due to the pressure pulsation of the water flow can be controlled. Since the bubble water flow exhibits the behavior of a free jet, its pressure attenuates as the square of the distance as it goes downstream along the jet axis. Therefore, as in the present invention, providing a suction recess serving as a pressure buffer area near the tip of the inlet nozzle has a great effect of suppressing vibration caused by pressure pulsation.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same components as those in FIG. 4 are denoted by the same reference numerals.

As shown in FIG. 1, the mixing chamber 4 is composed of an inlet nozzle 1 and an outlet nozzle 2 which are opposed to each other at a predetermined distance, and a mixed air suction unit 3 including the inlet nozzle 1 and an outlet nozzle suction unit 2a. The cross-sectional area of the mixed air suction section 3 gradually decreases from the inlet 3a, and takes a minimum value at the inlet nozzle tip 3b.
The downstream passage following the passage 3b is a bubble water passage in which air and water are mixed. Provided. The inlet nozzle 1 is connected to a bathtub 9 via a circulation pump 7 and a pipe 8 on the upstream side. On the other hand, the tip of the outlet nozzle 2 communicates with the bathtub 9. The mixed air suction section 3 communicates with the mixed air suction pipe 5, and the other end of the mixed air suction pipe 5 is open to the atmosphere.

When the circulation pump 7 is operated, warm water sucked from the bathtub 9 through the pipe 8 becomes a high-speed water flow at the inlet nozzle 1 having a reduced area, and is jetted into the mixing chamber 4. As a result, the pressure in the mixing chamber 4 becomes negative, and the air in the bathroom is sucked into the mixing chamber 4 from the mixed air suction part 3 through the mixed air suction pipe 5. In this case, since the area of the mixed air suction section 3 is formed so as to gradually decrease from the inlet 3a and become minimum near the tip 3b of the inlet nozzle, the air speed increases smoothly, and a large amount of air flows smoothly. Can be inhaled. In the vicinity 3b of the inlet nozzle tip, the intake air mixes with the water jet spouted from the inlet nozzle 1, and the mixed two-phase jet spouts toward the rapidly expanded suction recess 3c.

As described above, in this configuration, a large amount of air can be smoothly sucked, and at the same time, the bubble water stream formed in the mixing chamber 4 is caused to directly collide with the outlet nozzle suction part 2a and the outlet nozzle diffuser part 2b. No, it can be ejected to the suction recess 3c which is a pressure buffer space,
It is possible to reduce the solid-borne sound.

 FIG. 3 shows another embodiment of the present invention.

In the figure, the same reference numerals as in FIG. 2 denote the same parts. The difference from the above embodiment is that a fixed frame 6 is provided concentrically on the outer periphery of the outlet nozzle 2, a pressure chamber 10 is formed by the outlet nozzle 2 and the fixed frame 6, and the diffuser passage 2 b of the pressure chamber 10 and the outlet nozzle is formed. When the communicating pressure hole 11 is replaced with a vector having a positive flow direction for the fluid flowing through the pressure hole and the outlet nozzle, the intersection of both vectors is formed to be an acute angle.

With such a configuration, since the pressure in the pressure chamber 10 is higher than that in the outlet nozzle diffuser 2c, a circulating flow connecting the pressure chamber 10, the pressure holes 11, and the outlet nozzle diffuser 2c can be generated. As a result, a large turbulent flow mainly composed of bubbles generated along the side wall of the diffuser passage 2b is expelled downstream, and the outlet nozzle diffuser 2c
Since the entire flow from the bath to the bathtub can be made uniform, it is possible to reduce generated noise by suppressing pressure pulsation.

Advantageous Effects of the Invention As is clear from the above embodiments, the bubble water flow generating device of the present invention is provided with a pair of inlet nozzles and outlet nozzles opposed to each other at a predetermined distance, and mixed air mixed at the inlet nozzle outer peripheral portion and the outlet nozzle inlet. A suction area is formed, and the passage area of the mixed air suction section is gradually reduced from the inlet to the vicinity of the tip of the inlet nozzle, and the mixed air and hot and cold water ejected from the inlet nozzle are located downstream from the tip of the inlet nozzle. In the outlet nozzle forming the fluid passage of the mixed fluid, the following effect is obtained by adopting the configuration having the suction concave portion between the outlet nozzle suction portion and the diffuser portion.

(1) Since the mixed air suction passage is smoothly and smoothly narrowed, a large amount of air can be smoothly sucked and mixed with the jet water jet spouted from the inlet nozzle.

(2) The bubble water flow mixed near the tip of the inlet nozzle is
After jetting into the suction recess, it flows along the diffuser passage of the outlet nozzle, so that the pressure fluctuation is small and the chance of the bubble water stream directly colliding with the suction part of the outlet nozzle is also reduced. As a result, it is possible to reduce not only the flow noise caused by the pressure pulsating flow but also the group propagation sound that propagates to the building through the pipe by vibrating the mixing chamber wall.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bubble water flow generator showing one embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view near a mixing chamber of the bubble water flow generator, and FIG. Sectional view, fourth
FIG. 1 is a sectional view showing a conventional bubble water flow generator. 1 ... inlet nozzle, 2 ... outlet nozzle, 2b ... diffuser passage, 3 ... mixed air suction section, 3b ... near inlet nozzle tip, 3c ... suction recess, 10 ... pressure chamber, 11 ... pressure Hole.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61H 23/00 A47K 3/00

Claims (2)

(57) [Claims] An inlet nozzle and an outlet nozzle are opposed to each other at a predetermined distance, and a mixed air suction portion is formed by an outer peripheral portion of the inlet nozzle and a suction portion of the outlet nozzle. From the inlet nozzle tip to the vicinity of the inlet nozzle tip, and the outlet nozzle downstream of the inlet nozzle tip and forming a fluid passage for the mixed air and the mixed fluid of hot and cold water ejected from the inlet nozzle. A bubble water flow generating device provided with a suction recess between the and the diffuser portion. 2. A pressure chamber is provided so as to surround the outlet nozzle, a pressure hole communicating the diffuser passage of the outlet nozzle with the pressure chamber is provided downstream of the suction recess, and a direction in which fluid flows through the pressure hole and the outlet nozzle. 2. The bubble water flow generating device according to claim 1, wherein an angle at which the two vectors intersect each other becomes an acute angle when the vector is replaced with a positive vector.