JP2008178779A - Microbubble generating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generating apparatus stably feeding to bathing water white turbid gas-liquid dissolved fluid containing a large amount of microbubbles of appropriate sizes, by stabilizing the sizes 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 the 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 pressure reducing part 13 lowering the pressure proceeding toward the discharge port 3 between the Venturi tube 12 and discharge port 3. <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 unit that mixes a gas with the liquid to obtain a gas mixed liquid, a pump that pressurizes the gas mixed liquid and flows it to the flow path, and a liquid layer and a gas layer inside the gas mixed liquid are supplied. There are provided 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 problems, 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 pulverization unit that pulverizes the generated fine bubbles to generate smaller fine bubbles, and a pressure reducing unit that reduces the pressure as it goes to the discharge port side between the fine bubble generation means and the discharge port It is characterized by having prepared.

  In the invention according to claim 2 of the present application, in the fine bubble generating device according to claim 1, the pressure reducing portion has an inner diameter that increases from a base end portion on the fine bubble generating means side toward a terminal end portion on the discharge port side. The inner peripheral surface is formed in a step shape.

  According to a third aspect of the present invention, in the fine bubble generating device according to the first aspect, the pressure reducing portion has an inner diameter that increases from a base end portion on the fine bubble generating means side toward a terminal end portion on the discharge port side. The inner peripheral surface is formed to be inclined.

  The invention according to claim 4 of the present application is characterized in that, in the fine bubble generating device according to any one of the first to third aspects, the fine bubble pulverizing section is constituted by a Venturi tube.

  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, by providing a pressure reducing unit that reduces the pressure as it goes to the discharge port between the fine bubble generating means and the discharge port, the pressure on the gas-liquid dissolved fluid can be reduced before the fine bubble is ejected and discharged. The pressure can be gradually reduced. 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 microbubble generator according to the second aspect of the present invention, in particular, by forming the inner peripheral surface of the decompression portion into a step shape such that the inner diameter increases toward the terminal end on the discharge port side, a plurality of different shapes are obtained. A continuous tube having an inner diameter can be constructed. Thereby, since the pressure with respect to a gas-liquid dissolution fluid can be made into an appropriate pressure sequentially, a fine bubble can be grown to the diameter suitable for cloudiness.

  In the microbubble generator according to the third aspect of the present invention, in particular, by forming the inner peripheral surface of the decompression portion so as to be inclined so that the inner diameter increases toward the terminal portion on the discharge port side, gas-liquid dissolution is achieved. The pressure on the fluid can be reduced with linearity. As a result, the rapid decompression can be further reduced, so that fine bubbles can be grown to a diameter suitable for cloudiness.

  In the fine bubble generating apparatus according to the fourth aspect of the present invention, in particular, since the fine bubble pulverization section is composed of a venturi tube, the flow velocity and pressure of the gas-liquid dissolving fluid are changed at the portion where the inner diameter is reduced. be able to. As a result, the bubbles in the gas-liquid dissolving fluid can be crushed, so that the fine bubbles can be easily made smaller.

  1-5 has shown the microbubble generator which is 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 decompression unit 13 having a venturi tube 12 which is a fine bubble crushing unit that generates smaller fine bubbles, and reduces the pressure between the fine bubble generation unit 30 and the discharge port 3 toward the discharge port 3 side. It has. Further, the inner surface of the decompression unit 13 is formed in a step shape so that the inner diameter increases from the base end part 13a on the fine bubble generating means 30 side toward the terminal end part 13b on the discharge port 3 side. 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 device that generates fine bubbles in bath water in a bathtub 1, and a suction port 2 and a discharge port 3 are provided on an inner surface of the bathtub 1. Is provided with an air inlet 4.

  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 part 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 decompression part 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. It becomes the liquid storage part 26 to be performed.

  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 portion 21 facing the ejection port 9 And collides with the liquid stored in the liquid storage section 26 at the interface 24 and is agitated. 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 FIG. 5, the decompression unit 13 is configured between the fine bubble generating means 30 and the discharge port 3. The inner surface of the decompression unit 13 is formed in a step shape so that the inner diameter increases from the base end part 13a on the fine bubble generating means 30 side toward the terminal end part 13b on the discharge port 3 side. That is, a plurality of tubes having different inner diameters are continuously formed. As the gas-liquid dissolving fluid containing a large amount of fine bubbles flowing from the fine bubble generating means 30 flows through the pipe having the inner diameter increasing gradually, the pressure applied to the gas-liquid dissolving fluid is sequentially reduced. Go. In the example shown in FIG. 5, three different inner diameter tubes indicate the decompression unit 13 in succession. However, the present invention is not limited to this, and the number of stages is increased or decreased depending on the size and amount of fine bubbles. Also good.

  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, by providing the pressure reducing unit 13 between the fine bubble generating means 30 and the discharge port 3 to reduce the pressure as it goes to the discharge port 3 side, the gas-liquid dissolving fluid until the fine bubbles are ejected and discharged. The pressure to can be gradually reduced. 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. 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, by forming the inner peripheral surface of the decompression unit 13 in a step shape such that the inner diameter increases toward the terminal end 13b on the discharge port 3 side, a continuous tube having a plurality of different inner diameters can be configured. . Thereby, since the pressure with respect to a gas-liquid dissolution fluid can be made into an appropriate pressure sequentially, a fine bubble can be grown to the diameter suitable for cloudiness.

  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.

  FIG. 6 shows a fine bubble generating apparatus according to the second embodiment of the present invention. Here, only matters different from those in the first embodiment will be described, and other matters (configuration, operational effects, and the like) are the same as those in the first embodiment, and thus description thereof will be omitted.

  As shown in FIG. 6, the decompression unit 13 is configured between the fine bubble generating means 30 and the discharge port 3. The decompression unit 13 has an inner peripheral surface that is inclined so that the inner diameter increases from the base end part 13a on the fine bubble generating means 30 side toward the terminal end part 13b on the discharge port 3 side. That is, the decompression unit 13 forms a divergent tube. The gas-liquid dissolving fluid containing a large amount of microbubbles flowing from the microbubble generating means 30 flows through a divergent pipe having an inner diameter that gradually increases, whereby the pressure applied to the gas-liquid dissolving fluid is linear. It declines sequentially with sex.

  Therefore, the pressure on the gas-liquid dissolving fluid is reduced with linearity by forming the inner peripheral surface of the decompression unit 13 so as to be inclined so that the inner diameter increases toward the terminal end 13b on the discharge port 3 side. be able to. As a result, the rapid decompression can be further reduced, so that fine bubbles can be grown to a diameter suitable for cloudiness.

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 sectional drawing of the pressure reduction part in the same microbubble generator. It is sectional drawing of the pressure reduction part in the microbubble generator which is the 2nd Embodiment of this invention.

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 Pressure reducing part 30 Fine bubble generating means

Claims (4)

  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 unit; and a pressure reducing unit that decreases pressure as it goes to the discharge port side between the fine bubble generating means and the discharge port.   2. The pressure reducing part has an inner peripheral surface formed in a step shape so that an inner diameter increases from a base end part on a fine bubble generating means side toward a terminal part on a discharge port side. Fine bubble generator.   The pressure reducing part is formed with an inner peripheral surface inclined so that the inner diameter increases from the base end part on the fine bubble generating means side toward the terminal part on the discharge port side. Fine bubble generator.   The fine bubble generating apparatus according to any one of claims 1 to 3, wherein the fine bubble pulverizing unit is configured by a Venturi tube.

Images