JP7089342B2 - Fine bubble generator - Google Patents

Description

The present invention relates to a fine bubble generator that contains fine bubbles in water.

Microbubbles are microbubbles or nanobubbles (diameter about 50 to 500 nm) with a bubble diameter of about 100 μm or less, and small bubbles smaller than pores can effectively remove dirt from pores and sweat glands. It can be used in various fields, especially in beauty and health. In addition to these uses, the fine bubbles are also used for the purpose of promoting the growth of plants.

High-speed shearing method, pressure crushing method, cavitation method, etc. are known to generate liquid containing such fine bubbles (hereinafter referred to as "fine bubbles"), but most of them are the aspirator method. Air is sucked from the outside. Alternatively, it is forcibly injected. For example, in Patent Document 1, a mixed fluid composed of a liquid accelerated by an accelerating means and a gas (bubbles having a diameter of about several millimeters) introduced into the casing by the gas-liquid mixing means causes cavitation in the casing. A microbubble generator that generates microbubbles is disclosed.

Further, in Patent Document 2, a first nozzle on the water passage inlet side, which gradually reduces the cross-sectional area orthogonal to the central axis from the inlet to the outlet, and a communication passage provided through the outlet of the first nozzle are provided. It has a second nozzle on the outlet side for water passage, which is continuously arranged via the inlet and gradually increases the cross-sectional area orthogonal to the central axis from the inlet to the outlet, and a gap or a side chamber opened only in the communication passage. The microbubble generator is disclosed. The microbubble generator of Patent Document 2 generates microbubbles from dissolved air in water by a cavitation method without sucking air from the outside.

Japanese Unexamined Patent Publication No. 2007-21343 Japanese Unexamined Patent Publication No. 2009-136864

However, the micro-bubble generator according to Patent Document 1 is not suitable for household use where a simple type directly connected to the water supply is desired because the gas-liquid mixing device for accelerating the water stored in the tank becomes large in size.

Further, the micro-bubble generator according to Patent Document 2 may not be able to supply a sufficient amount of water for use because the water flow rapidly expanded in the communication passage provided with the concubine is depressurized by the second nozzle. .. Therefore, it is troublesome to adjust the width size in the axial flow direction of the concubine according to the situation of the water pressure at that time. By providing such an adjustment mechanism, the configuration of the entire nozzle is complicated.

From the above points, the present invention is directly connected to a water supply pipe for tap water for home use, and can effectively generate microbubbles with a simple structure without introducing air from the outside. The purpose is to provide a vessel.

In order to solve the above problems, the present invention is a fine bubble generator attached to a water supply pipe of tap water supplied at a predetermined water pressure, and is an intake water arranged on the upstream side along the flow direction of the tap water. The nozzle is provided with a portion and a nozzle arranged on the downstream side, and the nozzle is a water passage consisting of a first water passage on the inlet side, a neck portion in the center, and a second water passage on the outlet side along the flow direction. The first water passage has a conical shape in which the diameter gradually decreases so that tap water flows from the inlet to the neck at an increased flow rate, and the second water passage has a conical shape from the neck. The tap water discharged from the neck to the outlet has a conical shape whose diameter gradually increases so as to generate a rapid pressure drop that generates fine bubbles, and the intake portion is the first passage of the nozzle. It is composed of a plank arranged on the inlet side of the water channel, has a plurality of intake holes penetrating the plank along the flow direction, and each of the plurality of intake holes is relative to the flow direction of tap water. It is formed in an oblique columnar shape that is inclined with respect to the axis of the intake portion , and the oblique column has a bent portion that makes the angle of inclination larger in the intermediate portion from the inlet side to the outlet side of tap water. The inner wall of each intake hole is formed by an uneven surface composed of a large number of protrusions that increase the degree of turbulence of tap water passing through the intake hole, and the tap water passing through the intake hole is formed by the bent portion. After colliding with the large number of protrusions in a twisted state, the tap water is discharged in a direction inclined with respect to the axis of the intake portion, and the discharged tap water is the conical inner wall of the first water passage. It is characterized in that it is formed so as to collide with the water from an oblique direction to form the spiral swirling flow and flow into the neck .

Here, it is preferable to provide a plurality of the intake holes in a circular shape at equal intervals. It is further preferable that the intake hole is provided with the inclination so as to discharge tap water in the same direction in the direction of the adjacent intake hole.

Then, by arranging a plurality of sets of the first water passage and the second water passage in series, cavitation generation at each nozzle is repeated, and the content rate of microbubbles is increased.

According to the present invention, the tap water supplied by the tap pressure forms a turbulent flow in the intake hole, and the tap water obliquely discharged from the intake hole swirls the inner wall of the first water passage and has a flow velocity. It goes downstream while raising the water, and is diffused and released in the second channel, so that effective cavitation-derived microbubbles are generated.

The side sectional view of the fine bubble generator which concerns on this invention is shown. (A) of the fine bubble generator shows an external perspective view from the upstream side, and (b) shows an external perspective view from the downstream side. (A), (b), and (c) show a plan view, a side view, and a plan view from the downstream side of the intake portion of the fine bubble generator, respectively. A schematic explanatory diagram of the cavitation action in the nozzle is shown. The side view of the intake part where the intake hole was bent and formed is shown.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the fine bubble generator 1 according to the present invention in a side sectional view, and is arranged in the middle of a water supply pipe 2 for guiding water from a water distribution pipe, an elevated water tank, or the like to a faucet.

The fine bubble generator 1 is configured by arranging a cylindrical nozzle 6 in a tubular body 3. (A) and (b) of FIG. 2 show the appearance of the tubular body 3 from the upstream side and the downstream side, respectively, in a perspective view. The tubular body 3 is composed of a first cylindrical portion 4 and a second cylindrical portion 5 having different cross-sectional diameters, and the first cylindrical portion 4 having a smaller diameter has a male screw portion 4a on its outer circumference, and a water supply pipe 2 is provided. The second cylindrical portion 5 having a large diameter is inserted into the upstream pipe portion 2A of the above and is connected by screwing, and has a female screw portion 5a on the inner circumference thereof, and the tip of the downstream pipe portion 2B of the water supply pipe 2 to be inserted. Is connected by screwing. An annular rubber packing 7 is fitted on the outer periphery of the first cylindrical portion 4, and when the first cylindrical portion 4 is inserted into the water supply pipe 2, the annular end face of the upstream pipe portion 2A has the rubber packing 7. It intervenes and comes into contact with the end face of the second cylindrical portion 5.

The outer diameter of the nozzle 6 is substantially equal to the inner diameter of the first cylindrical portion 4, and the nozzle 6 is held in the tubular body 3 in a state where a part of the nozzle 6 is inserted into the first cylindrical portion 4. The inside of the nozzle 6 is provided with a water passage portion 8 having a shape narrowed down from both left and right ends toward the center portion. That is, the water passage portion 8 has a structure in which a neck portion 9 having a minimum cross-sectional diameter is formed in the central portion thereof, and the water passage portion 8 is hollowed out in a substantially conical shape so that the diameter increases as it extends from the neck portion 9 to the left and right. It has become. Therefore, the water passage portion 8 is provided so as to communicate with the first water passage 8a whose diameter gradually decreases along the flow direction of the tap water and the outlet side of the first water passage 8a, and is provided along the flow direction of the tap water. It is composed of a second water passage 8b whose diameter gradually increases. The maximum diameter of the first water passage 8a on the inlet side of the nozzle 6 is preferably larger than the maximum diameter of the second water passage 8b on the outlet side, but the inlet is narrow even if the dimensions are the same. Is also good.

The water intake portion 10 is composed of a circular thick plate and is arranged in the tubular body 3 on the inlet side of the first water passage 8a of the nozzle 6. As shown in FIG. 2, the intake portion 10 of this example is provided with four round intake holes 11 that penetrate in the axial direction at equal intervals on a plane in a circular shape. Up to about 20 intake holes 11 can be provided depending on the flow rate of the installed tap water pipes and the like. Therefore, when the number of intake holes 11 is large, it is preferable to arrange them uniformly and evenly on the plane of the intake portion 10 rather than arranging them in a circle at equal intervals.

Then, as shown in the side view of FIG. 3B, the intake hole 11 is provided so that the central axis in the depth direction is inclined with respect to the axis of the water supply pipe 2. Therefore, since each intake hole 11 has a shape of an oblique cylinder, the tap water passing through the intake hole 11 is discharged in a direction inclined from the axis of the intake portion 10, and the tap water flow from the upstream pipe portion 2A is twisted. It becomes a swirling flow and is discharged from the intake unit 10. In FIG. 3B, only one of the intake holes 11 is shown as a representative.

At this time, each intake hole 11 is provided with an inclination so as to discharge tap water in the direction of the adjacent intake hole 11 while forming a swirling flow counterclockwise in FIG. 3 (c). Therefore, the tap water passing through each intake unit 10 becomes a swirling flow twisted in the same direction as shown by an arrow, and is introduced into the first water passage 8a of the nozzle 4.

Further, by making the inner wall surface of the intake hole 11 an uneven surface 11a, tap water is discharged from the intake hole 11 while increasing the degree of turbulence. In this example, a large number of protrusions are provided to form the uneven surface 11a. By improving the degree of turbulence in this way, the dissolved air in the tap water can be easily taken out, and cavitation bubbles can be effectively generated in the nozzle 4.

Since the tap water discharged as a swirling flow from each intake hole 11 diagonally abuts on the inner wall of the first water passage 8a, it advances to the neck 9 while swirling in a spiral shape as shown in FIG. Since the first water passage 8a has a narrowed structure, the speed is increased as it approaches the neck 9, and the water is discharged from the neck 9 to the second water passage 8b.

The tap water thus increased in speed is blown out from the neck 9 at a high pressure and diffused in the second water passage 8b. As a result, a sudden drop in pressure occurs, and innumerable fine cavitation bubbles are generated in tap water due to the boiling phenomenon and are discharged to the downstream pipe portion 2B. The lower limit of general tap water pressure is 1.5 kgf / cm ² to 3 kgf / cm ² (0.15 MPa0.3), and the nozzle 6 is included in tap water supplied to ordinary households. This tap water pressure alone turns the existing air into water containing air bubbles that have been refined by cavitation. The ideal tap water pressure in this case is 2.0 to 4.0 kgf / cm ² (0.2 to 0.39 MPa).

In the above embodiment, the maximum diameter of the first water passage 8a is made larger than the maximum diameter of the second water passage 8b, but the same diameter may be formed so as to be symmetrical with respect to the neck 9. .. Further, the horizontal dimensions from the neck 9 to each maximum diameter portion may be different, and the point is that the pressure of the tap water blown out from the first water passage 8a and the pressure in the second water passage 8b. It suffices if cavitation bubbles of appropriate quantity and quality as fine bubbles can be generated in relation to the decreasing pressure due to diffusion.

Further, as shown in FIG. 5, the shape of the intake hole 11 may be configured such that the shape from the inlet side to the outlet side is not a slanted cylinder but a shape having a bent portion in the middle. As a result, the flow of tap water passing through the intake hole 11 is twisted, so that the degree of turbulence is further increased in combination with the uneven surface 11a of the inner wall of the intake hole 11, and the turbulence is further increased in the nozzle 11. The effect of generating cavitation bubbles can be improved.

The fine bubble generator 1 is directly connected to the water supply supplied to a general household, and the air contained in the tap water is made into microbubbles by the cavitation action only by the pressure of the tap water. The fine bubble generator 1 is arranged on the downstream side of the water meter, and the piping distance from the water meter to the faucet is about 15 meters on average. In this case, it is impossible to see the microbubbles visually, but by shining a laser on the water to be treated with a laser pointer in a dark place and detecting the reflected light from the bubbles, microbubbles are formed even at the end of the pipe of 15 meters. It is confirmed that it has been done.

In order to generate microbubbles more efficiently, a plurality of nozzles 6 are connected in series to the second cylindrical portion 5 by connecting the first water passage 8a of the nozzle 6 in the rear stage to the second water passage 8b of the nozzle 6 in the front stage. It is advisable to place it inside the and repeat the occurrence of cavitation.

1 Fine bubble generator 2 Water supply pipe 8a 1st water passage 8b 2nd water passage 10 Intake part 11 Intake hole 11a Concavo-convex surface

Claims (3)

It is a fine bubble generator attached to the water supply pipe of tap water supplied at a predetermined water pressure .
Equipped with an intake section located upstream along the direction of tap water flow and a nozzle located downstream.
The nozzle has a water passage including a first water passage on the inlet side, a neck portion in the center, and a second water passage on the outlet side along the flow direction.
The first channel has a conical shape whose diameter gradually decreases so that tap water flows from its inlet to the neck at an increased flow rate.
The second channel has a conical shape with a gradual increase in diameter so that tap water discharged from the neck from the neck to its outlet causes a rapid pressure drop that produces fine bubbles.
The water intake portion is composed of a plank arranged on the inlet side of the first water passage of the nozzle, and has a plurality of intake holes penetrating the plank along the flow direction.
Each of the plurality of intake holes
It is formed in an oblique columnar shape that is inclined with respect to the axis of the intake portion with respect to the flow direction of tap water , and the oblique column is formed in the intermediate portion from the inlet side to the outlet side of the tap water. A bend is formed to increase the angle,
The inner wall of each intake hole is formed of an uneven surface composed of a large number of protrusions that increase the degree of turbulence of tap water passing through the intake hole .
The tap water that passes through the intake hole is
After colliding with the large number of protrusions while being twisted by the bent portion, it is discharged in a direction inclined with respect to the axis of the intake portion.
The discharged tap water was formed so as to collide with the conical inner wall of the first channel from an oblique direction to form a spiral swirling flow and flow into the neck. Characterized by a fine bubble generator. The fine bubble generator according to claim 1, wherein the plurality of intake holes are provided in a circular shape at equal intervals on the plane of the thick plate of the intake portion . The fine bubble generator according to claim 1 or 2 , wherein a plurality of the nozzles are arranged in series downstream of the water intake portion .

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