JP2018134588A - Microbubble generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microbubble generator capable of effectively generating fine bubbles by allowing tap water to be fed to a nozzle at proper pressure regardless of a water supply pressure state, according to a simple constitution.SOLUTION: A microbubble generator 1 includes a nozzle 6 comprising: a first water passage 8a whose diameter gradually decreases along a flowing direction of tap water fed at water supply pressure; and a second water passage 8b which is disposed so as to communicate with an outlet side of the first water passage 8a, and whose diameter gradually increases along the flowing direction of the tap water. On an inlet side of the first water passage 8a, water intake holes 11 are formed with their central axes inclined to the axis of a water supply pipe 2 of the tap water, and aperture areas of the water intake holes 11 are adjustable according to variable orifices 12. According to adjustment of the variable orifices 12 so that the tap water is supplied to the nozzle 6 at proper pressure, cavitation bubbles are effectively generated.SELECTED DRAWING: Figure 1

Description

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

  Microbubbles are microbubbles and nanobubbles (diameter of about 50 to 500 nm) having a bubble diameter of about 100 μm or less, and small bubbles smaller than pores can effectively remove dirt from pores and sweat glands. Can be used in various fields especially in beauty and health. The fine bubbles are used not only for these purposes but also for the purpose of promoting the growth of plants.

  In order to produce a liquid containing such fine bubbles (hereinafter referred to as “fine bubbles”), a high-speed shearing method, a pressure crushing method, a cavitation method, and the like are known, but most of them are an aspirator method. Air is sucked from the outside. Or forced injection. For example, in Patent Document 1, cavitation is caused in a casing by a mixed fluid composed of a liquid accelerated by an accelerating unit and a gas (bubbles having a diameter of several millimeters) introduced into the casing by a gas-liquid mixing unit. Thus, a fine bubble generating device that generates fine bubbles is disclosed.

  Further, in Patent Document 2, a first nozzle on the water inlet side that gradually reduces the cross-sectional area perpendicular to the central axis from the inlet toward the outlet and the outlet of the first nozzle on the inlet side are provided in communication. A second nozzle on the outlet side for water passage which is continuously disposed through the communication passage and gradually increases in cross-sectional area perpendicular to the central axis from the inlet toward the outlet, and a gap opened only in the communication passage or A fine bubble generator having a side chamber is disclosed. The fine bubble generator of Patent Document 2 generates fine bubbles from dissolved air in water by a cavitation method without inhaling air from the outside.

JP 2007-21343 A JP 2009-136864 A

  However, the fine bubble generating device according to Patent Document 1 is not suitable for home use where a gas-liquid mixing performed by accelerating water stored in a tank is increased in size and a simple water supply type is desired.

  Moreover, although the fine bubble generator by patent document 2 adjusts the width size in the axial flow direction of a side chamber according to the condition of water supply pressure, it is between a 1st nozzle and a 2nd nozzle by an adjustment mechanism. Since the side chamber whose size is changed is provided, the configuration of the entire nozzle is complicated.

  From the above points, the present invention provides a fine bubble generator that effectively generates fine bubbles by enabling tap water to be supplied to a nozzle at an appropriate pressure regardless of the state of the water pressure by a simple structure. The purpose is that.

  In order to solve the above-mentioned problem, the present invention is a fine bubble generator attached to a tap water supply pipe sent to a household, and has a diameter along the flowing direction of the tap water fed by tap pressure. A first water passage that gradually decreases, a second water passage that is provided in communication with the outlet side of the first water passage and that gradually increases in diameter along the direction in which tap water flows, and an inlet portion of the first water passage And a water intake portion provided with a plurality of water intake holes, and an opening adjusting mechanism for changing an opening area of the water intake holes.

  Here, an embodiment of the aperture adjustment mechanism is an iris diaphragm mechanism formed by overlapping a plurality of diaphragm blades.

  Moreover, it is preferable to provide a plurality of the water intake holes in the water intake part at regular intervals in a circular shape. In this case, it is preferable that the central axis from the inlet side toward the outlet side is inclined with respect to the axis of the water supply pipe so that tap water is discharged in the same direction toward the adjacent intake hole. Thereby, since the tap water which passed the water intake part turns into a swirl flow and is introduce | transduced into a nozzle, a fine bubble is produced | generated effectively.

  Then, by arranging a plurality of sets of the first water passage and the second water passage in series, the occurrence of cavitation at each nozzle is repeated, and the content rate of fine bubbles increases.

  ADVANTAGE OF THE INVENTION According to this invention, tap water can be sent into a nozzle with an appropriate supply pressure by adjusting the opening area of the water intake hole of the water intake part arrange | positioned in the front | former stage of a nozzle. Therefore, it is possible to realize a fine bubble generator capable of effectively generating cavitation bubbles regardless of the water pressure without complicating the nozzle configuration.

The side surface sectional view of the fine bubble generator concerning the present invention is shown. The external appearance perspective view of the water intake part in a microbubble generator is shown. The schematic diagram explaining the change of the opening area of the inlet of a water intake hole adjusted with an opening area adjustment mechanism is shown. (A) shows the side view of a water intake part, (b) shows the external appearance perspective view from a downstream. The typical explanatory view of cavitation generating action in a nozzle is shown.

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

  The fine bubble generator 1 is configured by arranging a cylindrical nozzle 6 in a cylindrical body 3. The cylindrical body 3 has an inlet side connecting portion 3A connected by screwing with the upstream pipe portion 2A of the inserted water supply pipe 2, and an outlet side connected by screwing with the downstream pipe portion 2B of the inserted water supply pipe 2. The connection part 3B is provided at both ends.

  The outer diameter of the nozzle 6 is substantially equal to the inner diameter of the cylindrical body 3 and is fixedly attached to the cylindrical body 3. Inside the nozzle 6, there are provided water passing portions 8 each having a shape that is narrowed down from the left and right ends toward the center. That is, the water flow portion 8 is formed with a neck portion 9 having a minimum cross-sectional diameter at the center, and 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 flow part 8 is provided in communication with the first water passage 8a whose diameter gradually decreases along the direction in which the tap water flows and the outlet side of the first water passage 8a, and along the direction in which the tap water flows. The second water passage 8b has a diameter that gradually increases.

  The water intake unit 10 is formed of a circular thick plate, and is disposed in the cylindrical body 3 on the inlet side of the first water passage 8 a of the nozzle 6. As shown in FIG. 2, the water intake portion 10 of this example is formed with four circular water intake holes 11 penetrating in the axial direction at equal intervals on a plane. And the intake part 10 equips each intake hole 11 with the variable orifice 12 which is an opening adjustment mechanism for changing an intake capacity according to the pressure and flow volume of tap water. The water intake holes 11 provided in the water intake unit 10 can be provided up to about 20 at the maximum according to the flow rate of a pipe of tap water to be installed. Therefore, when the number of the water intake holes 11 is increased, the water intake holes 11 may be uniformly and evenly arranged on the plane of the water intake unit 10 in addition to the circular arrangement at equal intervals.

  The variable orifice 12 is an orifice having an iris diaphragm mechanism and configured to change the opening area of the water intake hole 11. The iris diaphragm mechanism is generally known as a diaphragm of a camera lens or the like. As shown in FIG. 3, for example, as shown in FIG. 3, a gear (see FIG. The area of the opening 14 is changed in four ways. In this case, the gears of the variable orifices 12 are simultaneously driven by rotating the hole diameter adjustment dial 13 provided in the outer ring of the water intake unit 10, and the opening areas of the water intake holes 11 are simultaneously adjusted to the same size. It is configured as follows.

  With such a variable orifice 12, when the supply pressure of tap water is low, it is possible to increase the supply pressure by reducing the opening area of the water intake hole 11 and introduce it into the nozzle 6. The supply pressure of tap water can be adjusted to a certain level.

And the tap water discharged | emitted from the water intake part 10 is restrict | squeezed by passing the 1st water flow path 8a, and raises a speed, so that it approaches toward the neck part 9, and goes from the neck part 9 to the 2nd water flow path 8b. Released. The tap water whose speed has been increased in this way is blown out from the neck 9 at a high pressure and diffused in the second water passage 8b. As a result, a sudden pressure drop occurs, and countless fine cavitation bubbles are generated in the tap water due to the boiling phenomenon, and are released to the downstream pipe portion 2B. The general tap water pressure has a lower limit of 1.5 kgf / cm ² to 3 kgf / cm ² (0.15 MPa 0.3), and the nozzle 6 is included in tap water supplied to a general household. Only the tap water pressure is used to convert the air that is contained into water containing bubbles that are 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 water intake hole 11 is provided so that its depth direction is perpendicular to the diameter of the circular water intake unit 10, that is, the direction in which tap water flows, but FIG. Other embodiments are shown. In this embodiment, the water intake hole 11 is provided so that the central axis in the depth direction is inclined with respect to the flow direction of tap water, as shown in FIG. Therefore, since the water intake hole 11 has a slanted cylinder shape, tap water passing through the water intake hole 11 is discharged in a direction inclined from the axis of the water intake part 10 and a twist is added to the tap water flow sent in the horizontal direction. Will be.

  Then, as shown in FIG. 4B, each intake hole 11 is inclined so that tap water is discharged in the direction of the adjacent intake hole 11 while turning counterclockwise in the figure. Is provided. Therefore, the tap water passing through each water intake section 10 becomes a swirl flow twisted in the same direction as indicated by an arrow, and is introduced into the first water passage 8a of the nozzle 6.

  Since the tap water discharged as a swirling flow from each water intake hole 11 strikes the inner wall of the first water passage 8a from an oblique direction, it proceeds to the neck portion 9 while spirally turning as shown in FIG. Since the first water passage 8a has a narrowed structure, tap water increases in speed as it approaches the neck 9, and is discharged from the neck 9 to the second water passage 8b.

  The tap water whose speed has been increased in this way is blown out from the neck 9 at a high pressure and diffused in the second water passage 8b. As a result, a sudden pressure drop occurs, and countless fine cavitation bubbles are generated in the tap water due to the boiling phenomenon, and are released to the downstream pipe portion 2B. As described above, since the tap water is guided to the nozzle 6 by the swirling flow, the residence time due to the swirling in the first water passage 8a becomes longer. Done.

  As described above, the fine bubble generator 1 according to the present invention is provided with the water intake portion 10 including the water intake hole 11 in front of the nozzle 6 that generates fine bubbles, and adjusts the opening area on the tap water inlet side of the water intake hole 11. An opening adjustment mechanism is provided.

  Therefore, when tap water supply pressure is low, the opening area of the water intake hole 11 is reduced and the supply pressure is increased and introduced into the nozzle 6 so that the nozzle 6 is fine regardless of the tap water supply pressure. Bubbles can be generated stably. And when the flow rate of tap water by installation piping etc. is large and there is pressure loss, the bubble bubble generation in the nozzle 6 becomes efficient by expanding the opening area of the water intake hole 11 and avoiding pressure loss.

  Further, by adjusting the opening area of the water intake hole 11, the amount of fine bubbles generated can be controlled according to the purpose of use of the fine bubbles.

  As described above, the fine bubble generator 1 according to the present invention is directly connected to a tap water supplied to a general household, and the air contained in the tap water is fined by a cavitation action only by the pressure of the tap water. It is bubbled. And in the place where the water flow of tap water is weak, by rotating the hole diameter adjusting dial 13 and adjusting the opening area of each intake hole 11 to avoid pressure loss, it is possible to create a condition where cavitation bubbles are likely to be generated.

  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, fine bubbles cannot be visually observed, but fine bubbles are formed even at the end of a 15-meter pipe by detecting the reflected light from the bubbles by applying a laser to the water to be treated with a laser pointer in a dark place. It is confirmed that

  In order to generate fine bubbles more efficiently, a plurality of nozzles 6 are connected in series to the inside of the cylindrical body 3 by connecting the first water passage 8a of the nozzle 6 at the rear stage to the second water passage 8b of the nozzle 6 at the front stage. It is preferable that the cavitation is repeatedly generated.

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 2 Water supply pipe 8a 1st water flow path 8b 2nd water flow path 10 Water intake part 11 Water intake hole 12 Variable orifice (opening adjustment mechanism)

Claims (4)

A fine bubble generator attached to a water supply pipe for tap water to be sent to homes,
A first water passage whose diameter gradually decreases along the direction of flow of tap water fed by water pressure,
A second water passage which is provided in communication with the outlet side of the first water passage and whose diameter gradually increases along the direction in which the tap water flows;
A water intake section provided with a plurality of water intake holes provided at an inlet of the first water passage;
An opening adjusting mechanism for changing an opening area of the water intake hole;
A fine bubble generator.   2. The fine bubble generator according to claim 1, wherein the aperture adjustment mechanism is an iris diaphragm mechanism formed by overlapping a plurality of diaphragm blades.   A plurality of the water intake holes are provided at equal intervals in a circular shape in the water intake portion, and a central axis from the inlet side to the outlet side is provided so as to discharge tap water in the same direction toward the adjacent water intake hole. The fine bubble generator according to claim 1, wherein the fine bubble generator is inclined with respect to an axis of the water supply pipe.   4. The fine bubble generator according to claim 1, wherein a plurality of the first water passage and the second water passage are arranged in series. 5.

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