JPH0748257Y2 - Nozzle device for bubble bath - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a nozzle device for blowing a mixed flow of air and water (including hot water; the same applies below) into a bathtub of a bubble bath.

[Prior Art] FIG. 3 is a schematic diagram showing an example of a bubble bath.

The water in the bathtub 1 is sucked by the pump 2, pressurized, and supplied to the nozzle device 3.

The pressurized water flow supplied to the nozzle device 3 entrains the air supplied from the air pipe 4 and becomes a mixed flow 5 of air and water and is ejected into the bath 1 as indicated by an arrow a.

FIG. 4 is an enlarged sectional view of the nozzle device 3.

The main body casing 6 has the opening edge of the bathtub 1 through the gasket 7.
It is attached to the bathtub 1 by a mounting screw ring 6a so as to be closely attached to the periphery of the mounting hole 1a.

A water flow nozzle 6b is integrally formed on the rear wall of the main body casing 6 and jets the pressure water supplied from the pressure water pipe 8 in the direction of arrow b.

The mixed flow nozzle 9 is arranged with the inlet located near the tip of the arrow b.

The outer peripheral surface of the mixed flow nozzle 9 is formed into a spherical shape, and is rotatably supported by the nozzle holder 6d with respect to the main body casing 6 so that the jetting direction (arrow a ') of the mixed flow passage 9a can be adjusted. ing.

A mixing chamber is provided between the mixing flow nozzle 9 and the rear wall of the main body casing 6.
6c is formed, and the mixing chamber 6c is in communication with the atmosphere via the air pipe joint 10.

When the pressure water supplied by the pressure water pipe 8 is jetted from the water flow nozzle 6b into the mixing chamber 6c, air is entrained in the water flow due to the negative pressure generated in the mixing chamber 6c by the jet of the water flow and the viscosity of the water flow. , Air and water become a mixed flow and flow into the mixed flow channel 9a in the mixed flow nozzle 9. In this way, the water flow containing bubbles is jetted from the mixed flow nozzle 9 into the bath 1 in the direction of arrow a '.

[Problems to be solved by the device]

In the conventional bubble bath nozzle device shown in FIG. 4,
The mixing ratio of air that becomes air bubbles when mixed in the water flow is (a)
It changes depending on various factors such as the shape of the water flow nozzle 6b, (b) the shape of the mixing chamber 6c, (c) the pressure of the supplied pressure water, and (d) the influence of the inner diameter dimension Φ ₁ of the mixed flow passage 9a. Also receive.

However, regarding the size of the bubbles in the air-water mixed flow formed by the bubble bath nozzle, it has not been sufficiently clarified what kind of conditions affect what.

According to an experiment conducted by the present inventor, it is difficult to make the bubble diameter fine even if the conditions (a) to (d) that affect the air mixing ratio are changed.

On the other hand, with regard to the bubble bath, it is desired that the bubbles are fine in terms of the medical effect and the commercial value.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bubble bath nozzle device in which air bubbles in a jetted air-water mixed flow are minute and the air mixing ratio is high.

[Means for Solving the Problems]

In the prior art, the mixed flow passage 9a shown in FIG. 4 is also called a parallel portion, and the inner peripheral surface thereof has a right cylindrical shape.

In order to achieve the above-mentioned object, the present invention provides a curved surface having a smooth cross-section in the nozzle at the exit end of the mixed flow nozzle disposed downstream of the water flow nozzle for injecting pressurized water into the mixing chamber. It is characterized in that a short small-diameter portion having a narrowed shape is formed.

[Action]

According to the bubble bath nozzle device configured as described above, the water flow flowing into the mixed flow nozzle is an air / water mixed flow that already contains bubbles, and the bubbles are mixed in a relatively coarse state in the parallel portion. However, in the present invention, since it is squeezed by the small diameter portion formed at the outlet end, the flow velocity is increased and the relatively coarse bubbles upstream thereof are finely sheared and finely divided.
Moreover, since the flow passage cross section in the nozzle is narrowed by the smooth curved surface in the small diameter portion, the pressure loss is minimized, and the air / water mixed flow instantaneously passes through the small diameter portion, and In addition to increasing the air mixing ratio, the reaching distance of the air / water mixed flow injected into the bath is extended. Further, it was experimentally confirmed that, as an unexpected side effect, the noise is reduced as the bubbles are made finer.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of a bubble bath nozzle device of the present invention.

In this embodiment, the present invention is applied to the conventional bubble bath nozzle device shown in FIG. 4 and improved.

In FIG. 1, those denoted by the same reference numerals as those in FIG. 4 are the same or similar components as those in the conventional example. Next, the improvements will be described.

The mixed flow nozzle 12 of this example is an improved member corresponding to the mixed flow nozzle 9 of the conventional example.

In the mixed flow nozzle 12 of this example, the inner diameter near the outlet end of the parallel portion 12c is narrowed down by a smooth curved surface to form a short small diameter portion 12a. In this embodiment, the parallel portion 12c
The inner diameter of the small diameter portion 12a was 12 mm, and the inner diameter of the small diameter portion 12a was 10 mm.

A comparative experiment between the embodiment (FIG. 1) and the conventional example (FIG. 4) shows that the conventional example has relatively large bubbles, whereas the example has fine and creamy bubbles and the conventional example. In the example, the mixed state of the air / water mixed flow was incomplete, and the bubbles easily separated and dispersed from the jet water flow, but in the example, the bubbles reached deep inside the bath together with the jet water flow.

Further, the noise in the conventional example was 53 dB (measured 1 meter above the center of the water surface of the bathtub, A scale), but in the example, it was 50 dB (same condition), and the silent effect was confirmed.

FIG. 2 is a chart showing the ratio of the water flow rate to the air flow rate. The solid line is the conventional example (FIG. 4, Φ ₁ = 12 mm), and the two-dot chain line is the embodiment (FIG. 1, Φ ₁ = 12 mm). , Φ ₂ = 10 mm).

As is apparent from FIG. 2, the air / water flow rate ratio in the embodiment of the present invention is improved by about 70% as compared with the conventional example. The reason is considered to be that the transition from the parallel portion 12c to the small diameter portion 12a is a smooth curved surface, so that the throttling action is performed smoothly and the flow velocity of the air / water mixed flow increases.

[Effect of device]

As described above, according to the bubble bath nozzle device of the present invention, the bubbles of the air / water mixed flow are miniaturized, and a creamy and soft feeling is obtained, so that the commercial value is improved. In addition, the air-water mixed flow bubbles become finer and mix well, making it difficult for the bubbles to disperse, increasing the reach, and significantly reducing the operating noise as the bubbles become finer. There is an effect that the ratio of flow rate / water flow rate can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a bubble bath nozzle device according to the present invention. FIG. 2 is a table showing the air mixing ratios in comparison between the embodiment of the present invention and the conventional example. FIG. 3 is a schematic view of a bubble bath, and FIG. 4 is a sectional view of a conventional bubble bath nozzle. 1 ... Bathtub, 6 ... Main body casing, 6a ... Mounting screw ring, 6b ...
Water flow nozzle, 6c …… Mixing chamber, 12 …… Mix flow nozzle, 12a
…… Small diameter part, 12c …… Parallel part.

Claims (1)

[Scope of utility model registration request] 1. A water flow nozzle for injecting pressure water into the mixing chamber, an air flow path for entraining air into the mixing chamber by the pressure water flow ejected from the water flow nozzle, and an inflow port on the injection direction line of the water flow nozzle. In a bubble bath nozzle device having a mixed flow nozzle arranged in a position, a short small-diameter portion having a shape in which a cross section of a flow path in the nozzle is narrowed by a smooth curved surface is provided at an outlet end of the mixed flow nozzle. A bubble bath nozzle device characterized by being formed.