JP2008178780A - Microbubble generating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generating apparatus enhancing white turbidity of bathing water by stabilizing white turbidity of the microbubbles jetted out of a discharge port. <P>SOLUTION: The microbubble generating apparatus 100 is provided with a microbubble generating means 30 forming microbubbles by releasing the pressure of gas-liquid dissolved fluid with gas pressurized and dissolved in liquid, and the discharge port 3 jetting out the microbubbles. The microbubble generating means 30 has a gas dissolving part 8 forming the gas-liquid dissolved fluid containing microbubbles by dissolving gas into liquid, a Venturi tube 12 serving as a microbubble crushing part crushing microbubbles formed in the gas dissolving part 8 to form further smaller microbubbles, and a pipe part 13 between the microbubble generating means 30 and discharge port 3, long enough for growing the microbubbles. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fine bubble generating device that generates fine bubbles by separating and depositing a gas from a liquid after dissolving the gas in the liquid.

Conventionally, as disclosed in Japanese Patent Laid-Open No. 06-205812, there is a flow path through which a liquid flows in a fine bubble generator that generates a fine bubble by once dissolving a gas in a liquid and then precipitating the gas from the liquid. In addition, a gas mixing part for mixing a gas with the liquid to obtain a gas mixed liquid, a pump for pressurizing the gas mixed liquid and flowing it through the flow path, and a liquid layer and a gas layer inside the gas mixed liquid are supplied. There is a gas-liquid dissolution tank that dissolves gas in a liquid to obtain a gas-liquid dissolution fluid, and a fine bubble generation unit that deposits gas in the gas-liquid dissolution fluid to generate fine bubbles.
Japanese Patent Laid-Open No. 06-205812

  In the above-described conventional fine bubble generating device, the gas-liquid dissolving fluid containing fine bubbles is ejected and discharged from the discharge port, and the gas and liquid to be jetted and discharged by containing a large amount of fine bubbles of an appropriate size. The dissolving fluid can be clouded. However, when the gas-liquid dissolving fluid is ejected and discharged from the discharge port, the size of the fine bubbles is not stabilized by suddenly reducing the pressure, so that the cloudy gas containing a large amount of fine bubbles of an appropriate size is contained. There was a problem that the liquid-dissolving fluid was not stably supplied to bath water or the like.

  The present invention has been invented in view of the background art described above, and its purpose is to stabilize the size of the fine bubbles ejected from the discharge port and to contain a large amount of fine bubbles of an appropriate size. It is an object of the present invention to provide a fine bubble generator capable of stably supplying a cloudy gas-liquid dissolved fluid to bath water or the like.

  In order to solve the above-mentioned problem, in the invention according to claim 1 of the present application, a fine bubble generating means for generating a fine bubble by releasing the pressure of a gas-liquid dissolving fluid in which a gas is pressurized and dissolved in a liquid, and the fine bubble In the fine bubble generating device having a discharge port for injecting and discharging a gas, the fine bubble generating means generates a gas-liquid dissolving fluid containing fine bubbles by dissolving gas in a liquid, and is generated by the gas dissolving portion A fine bubble pulverizing section for pulverizing the generated fine bubbles to generate smaller fine bubbles, and a tube having a length sufficient to grow the diameter of the fine bubbles between the fine bubble generating means and the discharge port It is characterized by having a part.

  The invention according to claim 2 of the present application is characterized in that, in the fine bubble generating apparatus according to claim 1, the fine bubble pulverizing section is constituted by a Venturi tube.

  In the invention according to claim 3 of the present application, in the fine bubble generating device according to claim 1 or 2, the discharge port is provided in the bathtub, and the pipe part is accommodated around the bathtub. It is characterized by that.

  In the fine bubble generating apparatus according to the first aspect of the present invention, since the fine bubble generating means has the gas dissolving portion and the fine bubble pulverizing portion, the fine bubble generating device efficiently generates a large amount of fine bubbles having a smaller diameter. be able to. Furthermore, when there is no pipe part, there is a case where the fine bubble does not grow to an appropriate diameter and does not become cloudy because there is a sudden pressure change between the fine bubble generating means and the discharge port. By providing a sufficiently long tube portion between the generating means and the discharge port, the pressure on the gas-liquid dissolving fluid containing fine bubbles gradually increases toward the end of the tube portion on the discharge port side. Depressurized. By this, a large amount of small-sized fine bubbles generated by the fine-bubble generating means are grown to a diameter suitable for cloudiness before the fine bubbles are ejected and discharged from the discharge port, and the size of the fine bubbles ejected and discharged from the discharge port Therefore, the cloudy gas-liquid dissolving fluid containing a large amount of fine bubbles of an appropriate size can be stably supplied to bath water or the like.

  In the fine bubble generating device of the invention described in claim 2 of the present application, in particular, since the fine bubble generating means is composed of a venturi tube, the flow velocity and pressure can be changed at the portion where the inner diameter is reduced. As a result, the bubbles in the gas-liquid dissolving fluid can be crushed, so that the fine bubbles can be easily made smaller.

  In the fine bubble generating apparatus according to the third aspect of the present invention, in particular, since the pipe portion is housed around the bathtub, space saving is possible. Moreover, since the pipe part can be wound around the bathtub a plurality of times, it is easy to ensure a sufficient length for growing the diameter of the fine bubbles. Furthermore, since the outer wall of the bathtub is kept at a constant temperature by the hot water in the bathtub, the pipe portion can be kept warm by the heat of the outer wall of the bathtub. As a result, the water temperature of the gas-liquid dissolving fluid flowing in the pipe portion can be kept constant.

  FIGS. 1-6 has shown the microbubble generator which is the 1st Embodiment of this invention. The fine bubble generating apparatus 100 includes a fine bubble generating means 30 that generates a fine bubble by releasing the pressure of a gas-liquid dissolving fluid in which a gas is pressurized and dissolved in a liquid, and a discharge port 3 that ejects and discharges the fine bubble. The fine bubble generating means 30 pulverizes the fine bubbles generated in the gas dissolving portion 8 and the gas dissolving portion 8 for generating a gas-liquid dissolving fluid containing fine bubbles by dissolving the gas in the liquid. A venturi tube 12 that is a fine bubble crushing section that generates smaller fine bubbles, and a tube portion 13 that is long enough to grow fine bubbles between the fine bubble generation means 30 and the discharge port 3. ing. The venturi tube 12 includes an upstream portion 12a having a narrow central portion and a downstream portion 12b having a plurality of narrow portions.

  Hereinafter, the fine bubble generator of this embodiment will be described in more detail. FIG. 1 is a basic configuration diagram of a fine bubble generating apparatus 100 that generates fine bubbles in bath water in a bathtub 1, and a suction port 2 and a discharge port 3 are provided on the inner surface of the bathtub 1. The air inlet 4 is provided in the part.

  The suction port 2 is connected to the suction side of the pump 6 via the connection pipe 5, and the discharge side of the pump 6 is the injection port 9 located on the suction side of the gas dissolving part 8 of the fine bubble generating means 30 via the inflow pipe 7. It is connected to the. The outlet 10 on the discharge side of the gas dissolving section 8 is connected to one end of the venturi pipe 12 of the fine bubble generating means 30 via the outflow pipe 11, and the other end of the venturi pipe 12 is connected to the bathtub 1 via the pipe section 13. It is connected to the discharge port 3 installed on the side surface. The air suction port 4 is connected to an inflow pipe 7 between the pump 6 and the gas dissolving section 8 via a connection pipe 14, and a check valve 15 is provided in the connection pipe 14.

  And when the hot water which gas melt | dissolved is discharged in the bath water in the bathtub 1 from the discharge outlet 3, dissolved gas will precipitate in bath water and a fine bubble will come to be generated.

  As shown in detail in FIG. 2 and FIG. 3, the gas dissolving portion 8 is a cylinder composed of a side wall portion 21 having a straight cylindrical shape with a circular cross section, and end wall portions 22 that close both ends of the side wall portion 21. The center axis A (refer to the one-dot chain line in FIG. 2) of the side wall portion 21 that is configured by the shape body 23 and has a substantially cylindrical shape is 10 to 45 degrees with respect to the horizontal direction (see the arrow in FIG. 2). It is arranged in a posture inclined at an inclination angle θ.

  The cylindrical body 23 in this inclined posture has an upper end serving as an upstream end A, a lower end serving as a downstream end B, and a gas-liquid mixed fluid is introduced into the tubular body 23 on the upstream end A side. An ejection port 9 for ejecting is formed, and an outflow port 10 through which liquid flows out from the cylindrical body 23 is formed on the downstream end B side.

  In the cylindrical body 23, a gas such as air, which becomes a solute, and a liquid such as water, which becomes a solvent, are stored, and is approximately in the vicinity of the vertical center of the substantially cylindrical side wall portion 21. The interface 24 between the gas and the liquid is located, the portion on the upstream end A side from the interface 24 becomes a gas storage portion 25 in which gas is stored, and the portion on the downstream end B side from the interface 24 stores liquid. The liquid storage part 26 is made.

  The injection port 9 is an inner wall surface of the gas reservoir 25 (an inner wall surface of the side wall 21 or the end wall 22 on the upstream end A side from the interface 24) or an inner wall surface of the liquid reservoir 26 slightly below the interface 24. (The inner wall surface of the side wall 21 on the downstream end B side from the interface 24) and the outlet 10 is an inner wall surface near the end of the liquid reservoir 26 (the side wall 21 or the end on the downstream end B side from the interface 24). It is formed on the inner wall surface of the wall portion 22.

  The side wall 21 of the cylindrical body 23 is formed with an air vent 27 provided with a valve (not shown). The position of the air vent 27 is stored in the gas reservoir 25 and the gas reservoir 26. It becomes the level of the interface 24 of the liquid stored in.

  Next, the operation of the gas dissolving part 8 will be described. When the same liquid and gas stored in the cylindrical body 23 are ejected from the ejection port 9 on the lower side of the cylindrical body 23, the inner wall surface on the upper side of the side wall 21 facing the ejection port 9. And collides with the liquid stored in the liquid storage section 26 at the interface 24 and agitates. Further, the liquid stored in the liquid storage unit 26 is not only stirred by the gas-liquid mixed fluid colliding with the interface 24, but also by the gas-liquid mixed fluid injected into the cylindrical body 23 from the injection port 9. Stir.

  As described above, the gas stored in the cylindrical body 23 and the like by the agitation due to the collision with the inner wall surface of the side wall portion 21 of the gas-liquid mixed fluid, the collision at the interface 24, the agitation of the liquid when being ejected, The liquid, the gas in the gas-liquid mixed fluid, and the liquid are mixed, and dissolution of the gas into the liquid is promoted. That is, the bubbles (gas) mixed in the liquid are subdivided by shearing by mixing and stirring, and the total surface area in contact with the liquid is increased, so that the dissolution of the gas in the liquid is promoted.

  The liquid in which the dissolution of the gas has progressed is stored in the liquid storage portion 26 of the cylindrical body 23, but many undissolved bubbles are mixed in the stored liquid, and these bubbles become denser as they go upward. There are few bubbles near the lower end of the liquid reservoir 26, and there are almost no large bubbles. Then, the liquid at the lower end of the liquid storage part 26 in which the dissolution of the gas proceeds and almost no large bubbles are present flows out of the cylindrical body 23 from the outlet 10 on the lower side of the cylindrical body 23. .

  FIG. 4 is a sectional view of the venturi tube 12. The venturi tube 12 has a two-stage configuration of an upstream portion 12a having one narrow portion at the center portion and a downstream portion 12b having a plurality (five in the example of FIG. 4) narrow portions. In this way, by providing a plurality of narrow portions in parallel in the downstream portion 12b, after the bubbles in the gas-liquid dissolving fluid are crushed into small bubbles to some extent in the upstream portion 12a, smaller and finer in the downstream portion 12b. Since it can be bubbled, a large amount of smaller fine bubbles can be generated.

  As shown in FIGS. 5 and 6, the tube portion 13 has a proximal end portion 13 a connected to the venturi tube 12 of the fine bubble generating means 30 and a terminal end portion 13 b connected to the discharge port 3, so that the fine bubble generating means 30 is connected. And the discharge port 3. The gas-liquid dissolving fluid containing a large amount of fine bubbles flowing from the fine bubble generating means 30 flows through the pipe portion 13, thereby causing characteristics such as friction with the inner surface of the pipe portion 13 and viscosity of the gas-liquid dissolving fluid. As a result, the pressure on the gas-liquid dissolving fluid gradually decreases. Here, in order to grow the fine bubbles ejected and discharged from the discharge port 3 to a diameter suitable for white turbidity, and the jet flow ejected and discharged can be sufficiently clouded, the tube portion 13 is preferably 3 m or more, A length of 5 m or more is preferable. The diameter of the fine bubbles suitable for white turbidity is on the order of several tens of μm of 5 to 30 μm (average of about 20 μm).

  Further, as shown in FIG. 5, the tube portion 13 can be saved in space by being housed in a spiral between the fine bubble generating means 30 and the discharge port 3. As shown in FIG. 6, the pipe portion 13 can also be disposed on the outer periphery of the bathtub 1. Usually, the bathtub 1 is provided with an apron (not shown) on one surface on the washing place side, and a space is formed between the bathtub 1 and the apron (not shown). A space is similarly formed between the other three surfaces of the bathtub 1 and the wall. By storing the pipe part 13 in the space around the outer periphery of these bathtubs 1, it is possible to save space.

  Therefore, since the fine bubble generating means 30 has the gas dissolving part 8 and the venturi tube 12, it is possible to efficiently generate a large amount of fine bubbles having a smaller diameter. Furthermore, when there is no pipe part 13, since there was a rapid pressure change between the fine bubble generating means 30 and the discharge port 3, there was a case where the fine bubbles did not grow to an appropriate diameter and did not become cloudy. By providing a sufficiently long tube portion 13 between the fine bubble generating means 30 and the discharge port 3, the pressure on the gas-liquid dissolving fluid containing fine bubbles is reduced to the discharge port 3 side of the tube portion 13. The pressure is gradually reduced toward the terminal portion 13b. As a result, before the fine bubbles are ejected and discharged from the discharge port 3, a large amount of small bubbles having a small diameter generated by the fine bubble generating means 30 are grown to a diameter suitable for white turbidity, and are discharged and discharged from the discharge port 3. Since the size of the bubbles can be stabilized, a cloudy gas-liquid dissolving fluid containing a large amount of fine bubbles of an appropriate size can be stably supplied to the bathtub 1.

  Further, by using the venturi tube 12, the flow rate and pressure of the gas-liquid dissolving fluid can be changed at a portion where the inner diameter of the venturi tube 12 is reduced. As a result, the fine bubbles in the gas-liquid dissolving fluid can be crushed, so that the fine bubbles can be easily made smaller.

  Moreover, since the pipe part 13 is accommodated around the bathtub 1, space saving is attained. Moreover, since the pipe part 13 can be wound around the bathtub 1 a plurality of times, it becomes easy to ensure a sufficient length for growing the diameter of the fine bubbles. Furthermore, since the outer wall of the bathtub 1 is kept at a constant temperature by the hot water in the bathtub 1, the pipe portion 13 can be kept warm by the heat of the outer wall of the bathtub 1. As a result, the water temperature of the gas-liquid dissolving fluid flowing in the tube portion 13 can be kept constant.

It is a basic lineblock diagram of the bathtub apparatus provided with the fine bubble generating device which is the 1st embodiment of the present invention. It is a perspective view of the gas melt | dissolution part in the same fine bubble generator. The gas melt | dissolution part in the microbubble generator is shown, (a) is sectional drawing, (b) is II schematic sectional drawing of (a). It is sectional drawing of the venturi pipe in the same fine bubble generator. It is the schematic showing the accommodation state of the pipe part in the microbubble generator. It is the schematic showing another accommodation state of the pipe part in the microbubble generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Suction port 3 Discharge port 8 Gas melt | dissolution part 12 Venturi tube (microbubble crushing part)
13 Pipe part 30 Fine bubble generation means 100 Fine bubble generator

Claims (3)

  In a fine bubble generating apparatus comprising: a fine bubble generating means for generating a fine bubble by releasing a pressure of a gas-liquid dissolving fluid in which gas is pressurized and dissolved; and a discharge port for ejecting and discharging the fine bubble. The generating means includes a gas dissolving part that dissolves gas in a liquid to generate a gas-liquid dissolving fluid containing fine bubbles, and a fine bubble that pulverizes the fine bubbles generated in the gas dissolving part to generate smaller fine bubbles. A fine bubble generating apparatus comprising: a pulverizing portion; and a tube portion having a length sufficient to grow the diameter of the fine bubbles between the fine bubble generating means and the discharge port.   2. The fine bubble generating apparatus according to claim 1, wherein the fine bubble pulverizing section is constituted by a Venturi tube.   The fine bubble generating device according to claim 1 or 2, wherein the discharge port is provided in the bathtub, and the pipe portion is housed around the bathtub.

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