JP2007313465A - Gas dissolving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas dissolving apparatus in which a dissolving speed of gas into liquid is not delayed due to decrease of a contact area of gas with liquid, when large bubbles or air sump is formed by mutual connection of bubbles forming large bubbles or air sump, and large bubbles and air sump do not flow out of the gas dissolving apparatus. <P>SOLUTION: In this gas dissolving apparatus, a cylindrical body 2 is disposed with its center axis a tilted state in relation to the horizontal direction b; an interface 40 of a gas storing part 41 with a liquid storing part 42 is located at an intermediate part of a roughly cylindrical side wall part 21 of the cylindrical body 2; a jetting port 31 is provided at a location of the gas storing part 41 on the side wall part 21 of the cylindrical body 2; a flow-out port 32 making the liquid in the cylindrical body 2 flow out is provided near a lower end part of the liquid storing part 42 of the cylindrical body 2; and a rod-like long member 8 extending from the jetting port 31 to the flow-out port 32 is provided in the longitudinal direction of the side wall part 21 roughly along the center axis a of the roughly cylindrical side wall part 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas-liquid dissolution apparatus, and more particularly to a structure of a gas-liquid dissolution apparatus used for, for example, a bathtub apparatus for generating fine bubbles, oxygen supplementation in aquaculture, water purification of ponds and swamps (floating sludge) It is.

  2. Description of the Related Art Conventionally, there is known a gas dissolution apparatus that includes a gas dissolution tank and that dissolves gas in a liquid by jetting and stirring a gas-liquid mixed fluid in which gas and liquid are mixed in the gas dissolution tank (for example, Such a gas dissolution tank takes up installation space, and thus a small gas dissolution apparatus has been devised.

  This has a substantially cylindrical cylindrical body in the middle of the flow path, and stores gas and liquid in the cylindrical body, and a gas-liquid mixed fluid in which the gas and liquid are mixed in the cylindrical body. By jetting and stirring, the gas can be dissolved in the liquid, and a large tank such as the above-described gas dissolution tank is not required, and space saving can be achieved.

By the way, in the gas dissolving apparatus provided with such a cylindrical body, bubbles are easily connected to each other to form large bubbles or air pockets. When large bubbles or air pockets are formed, contact between the gas and the liquid occurs. There is a problem that the area becomes small and the dissolution rate of the gas into the liquid becomes slow, and large bubbles and air pockets flow out of the gas dissolving device.
JP 2004-290803 A

  The present invention has been made in view of the above points, and the object of the present invention is that bubbles are connected to each other to form large bubbles or air pockets. It is a problem to provide a gas dissolving device in which the contact area between the liquid and the liquid is reduced, the rate of dissolution of the gas into the liquid is reduced, and large bubbles and air pockets are not discharged from the gas dissolving device. It is what.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a substantially cylindrical tubular body 2 whose both ends are closed, stores gas and liquid in the tubular body 2, and A gas-dissolving device 1 for dissolving a gas in a liquid by injecting and stirring a gas-liquid mixed fluid in which a gas and a liquid are mixed in a cylindrical body 2, and the cylindrical body 2 has a central axis A in the horizontal direction. The interface 40 in the cylindrical body 2 is positioned so as to be inclined with respect to the gas and the liquid 40 stored in the middle portion of the substantially cylindrical side wall 21 of the cylindrical body 2. The portion above 40 is the gas reservoir 41 and the portion below the interface 40 is the liquid reservoir 42, and the gas-liquid mixed fluid is applied to the portion where the gas reservoir 41 of the side wall 21 of the cylindrical body 2 is located. An injection port 31 for injecting into the cylindrical body 2 is provided, in the vicinity of the lower end of the liquid storage portion 42 of the cylindrical body 2. An outflow port 32 through which the liquid in the shaped body 2 flows out is provided, and reaches the outflow port 32 from the injection port 31 in the longitudinal direction of the side wall portion 21 so as to substantially follow the central axis A of the substantially cylindrical side wall portion 21. A bar-like long member 8 is provided.

  As described above, since the elongate member 8 is disposed on the central axis A of the substantially cylindrical side wall portion 21 in which bubbles and air pockets are easily formed, the space in which the air pockets are formed is reduced or eliminated. When connected, it is difficult to form large bubbles or air pockets, and the contact area between the gas and the liquid is reduced, so that the dissolution rate of the gas in the liquid is prevented from slowing down. Outflow from the outlet 32 can be prevented.

  In the invention according to claim 2, in the invention according to claim 1, the long member 8 is arranged so that the longitudinal direction thereof is inclined from the central axis A of the substantially cylindrical side wall portion 21. It is characterized by.

  By adopting such a configuration, stirring is performed even when the side wall portion 21 rotates around the central axis A, and it is difficult to form large bubbles or air pockets in the central axis A portion.

  In the invention according to claim 3, in the invention according to claim 1 or 2, the long member 8 is formed of a hollow member having a hollow portion therein, and the liquid storage portion 42 of the long member 8 is formed. An air inflow port 81 communicating with the internal cavity is formed in a portion located at the position, and an air outflow port 82 communicating with the internal cavity is formed in a portion close to the gas storage portion 41 of the long member 8. It is characterized by comprising.

  By adopting such a configuration, large bubbles and air reservoirs that could not be dissolved are returned into the gas reservoir 41 via the long member 8, and the large bubbles and air reservoirs are discharged from the outlet 32 of the cylindrical body 2. Is further prevented from flowing out.

  In the invention according to claim 4, in the invention according to any one of claims 1 to 3, a tapered nozzle is attached to the injection port 31 or the shape of the injection port 31 is set in the cylindrical body 2. It is characterized by having a shape that is narrowed so that the cross-sectional area becomes smaller toward the direction.

  By setting it as such a structure, the flow rate of the gas-liquid mixed fluid injected from the injection port 31 can be accelerated, and the efficiency of mixing and stirring can be improved further.

  In the present invention, since the long member is disposed on the central axis of the substantially cylindrical side wall portion in which bubbles and air pockets are easily formed, the space in which the air pockets are formed is reduced or eliminated. Prevents large bubbles and air reservoirs from forming, and prevents large bubbles and air reservoirs from forming, reducing the contact area between gas and liquid and slowing the dissolution rate of gas into liquid. In addition, it is possible to prevent large bubbles and air pockets from flowing out from the outlet.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. The gas dissolving apparatus of the present invention is used, for example, in a microbubble generator that generates microbubbles in bath water, and an example of a bathtub apparatus provided with a microbubble generator will be described below.

  The whole structure of the bathtub apparatus which provided the fine bubble generator in FIG. 3 is shown. The suction port 62 and the discharge port 63 are provided on the inner surface of the bathtub 61, and the air suction port 64 is provided on the flange portion of the bathtub 11. The suction port 62 is connected to the suction side of the pump 66 through a connection pipe 65, and the discharge side of the pump 66 is connected to the injection port 31 on the suction side of the gas dissolving apparatus 1 through an inflow pipe 51. As the pump 66, a pump using a centrifugal pump is used, but is not particularly limited. The outlet 32 on the discharge side of the gas dissolving device 1 is connected to one end of a venturi 70 serving as a pressure release portion via an outflow pipe 52, and the other end of the venturi 70 is installed on the side surface of the bathtub 61 via a connection pipe 71. The discharge port 63 is connected. When hot water in which the gas is dissolved is discharged from the discharge port 63 into the bath water of the bathtub 61, the dissolved gas is precipitated in the bath water and fine bubbles are generated. In the figure, 67 is a connecting pipe serving as an air flow path connected between the midway of the inflow pipe 51 and the check valve 68, and 69 is air connected between the air suction port 64 and the check valve 68. It is a connecting pipe that becomes a flow path.

  The gas dissolving apparatus 1 is mainly composed of a cylindrical body 2 composed of a side wall portion 21 having a straight cylindrical shape with a circular cross section and end wall portions 22 that close end portions on both sides of the side wall portion 21. The cylindrical body 2 has a longitudinal direction, that is, a central axis (a dashed line in FIG. 1) of the side wall portion 21 having a substantially cylindrical shape, θ (10 to 45 ° in the present embodiment) with respect to a horizontal direction (arrow in FIG. 1). Arranged in an inclined posture. The inclined cylindrical body 2 has an upper end serving as the upstream A end and a lower end serving as the downstream B end, and the gas-liquid mixed fluid is tubular into the upstream A. An injection port 31 for injecting into the body 2 is formed, and an outflow port 32 through which liquid flows out from the cylindrical body 2 is formed on the downstream side B.

  In the cylindrical body 2, for example, a gas such as air serving as a solute and a liquid such as water serving as a solvent are stored, and approximately in the vicinity of the center of the substantially cylindrical side wall portion 21 in the vertical direction. The interface 40 between the gas and the liquid is located, and the portion on the upstream side A above the interface 40 becomes the gas storage portion 41 in which the gas is stored, and the portion on the downstream side B below the interface 40 stores the liquid. It becomes the liquid storage part 42 to be performed. The injection port 31 is a liquid located slightly below the interface 40, at the inner wall surface of the gas reservoir 41 (the inner wall surface of the side wall 21 or the end wall 22 on the upstream side A from the interface 40), at the position of the interface 40. It is formed on the inner wall surface of the reservoir 42 (inner wall surface of the side wall 21 on the downstream side B from the interface 40), and the outflow port 32 is the inner wall surface near the end of the liquid reservoir 42 (the side wall on the downstream side B from the interface 40). The inner wall surface of the portion 21 or the end wall portion 22 is formed. In the present embodiment, the injection port 31 is a bottom surface near the upper end of the liquid storage part 42 slightly below the interface 40, that is, an inner surface of the side wall part 21 near the end of the upstream side A of the liquid storage part 42, that is, a cylindrical body. 2 is formed at the bottom of the lower end of the left and right central part in a cross section perpendicular to the longitudinal direction. The end portion of the inflow pipe 51 is connected to the injection port 31. In this embodiment, the end portion of the inflow pipe 51 is connected to the injection port 31 as shown in FIGS. Is connected substantially perpendicularly to the inner wall surface of the side wall portion 21 in which is formed.

  In the present embodiment, the outflow port 32 is formed on the bottom surface that faces upward near the end on the downstream side B of the liquid reservoir 42, and the end of the outflow pipe 52 is connected to the outflow port 32.

  The side wall 21 of the cylindrical body 2 is formed with an air vent 33 provided with a valve (not shown), and the position of the air vent 33 is stored in the gas reservoir 41 with the gas and liquid stored therein. It becomes the level of the interface 40 of the liquid stored in the part 42.

  And the rod-shaped elongate member 8 from the injection port 31 to the outflow port 32 is provided in the longitudinal direction of the side wall portion 21 so as to substantially follow the central axis A of the above-described substantially cylindrical side wall portion 21. In the gas-liquid mixed fluid ejected from the ejection port 31, the bubbles are connected to each other to form large bubbles or an air reservoir, but the central axis i of the substantially cylindrical side wall portion 21 in which an air reservoir is easily formed. Since the long member 8 is disposed in the space, the space where the air pocket is formed is reduced or eliminated, and the bubbles are connected to make it difficult to form a large bubble or an air pool.

  The operation of the gas dissolving apparatus 1 will be described.

  In the cylindrical body 2, the liquid is stored in the liquid storage section 42 and the gas is stored in the gas storage section 41, and the same liquid stored in the cylindrical body 2 from the injection port 31. And the gas-liquid mixed fluid in which the gas is mixed is ejected. Since the ejection port 31 is formed on the bottom surface near the upper end of the liquid storage part 42 slightly below the interface 40 as described above, the gas-liquid mixed fluid ejected from the ejection port 31 is stored in the liquid storage part 42. The liquid is injected without being greatly reduced in momentum, collides with the inner wall surface on the upper side of the side wall portion 21 facing the injection port 31, rebounds on the inner wall surface, and enters the liquid storage portion 42 at the interface 40. It collides with the stored liquid and is stirred. In addition, the liquid stored in the liquid storage unit 42 is mixed with the gas-liquid mixture injected into the cylindrical body 2 from the injection port 31 in addition to the gas-liquid mixed fluid colliding with the interface 40 and being stirred as described above. Stirred by fluid.

  The gas, liquid, gas-liquid stored in the cylindrical body 2 due to agitation due to collision of the gas-liquid mixed fluid with the inner wall surface of the side wall portion 21 or collision at the interface 40, agitation of the liquid when jetted, etc. The gas and liquid in the mixed fluid are mixed, and dissolution of the gas into the liquid is promoted. That is, the bubbles (gas) mixed with the liquid are subdivided by shearing by mixing and stirring, and the total surface area in contact with the liquid is increased. In addition, the dissolved concentration of the gas near the interface with the liquid gas is increased. Since it is reduced by homogenization by mixing and stirring, and the dissolution rate of the gas in the liquid increases, 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 part 42 of the cylindrical body, but many undissolved bubbles are mixed in the stored liquid, and such bubbles are present as they move upward. In the vicinity of the lower end of the liquid reservoir 42, there are not many bubbles, and there are almost no large bubbles. Then, the dissolution of the gas proceeds, and the liquid at the lower end of the liquid storage part 42 in which there are almost no large bubbles is caused to flow out of the cylindrical body 2 from the outlet 32.

  Thus, since the cylindrical body 2 of the gas dissolving apparatus 1 is arranged in such a posture that the central axis i of the side wall portion 21 is inclined with respect to the horizontal direction B, the area of the interface 40 between the gas and the liquid is increased. In addition, the mixing and stirring efficiency can be improved, and the depth of the liquid stored in the liquid storage section 42 can be increased to prevent bubbles from flowing out of the cylindrical body 2. That is, when the cylindrical body 2 is arranged so that the longitudinal direction thereof is horizontal, the interface 40 between the gas and the liquid is formed over the entire area in the longitudinal direction and the area of the interface 40 is increased, but the liquid storage Since the depth of the liquid stored in the portion 42 is about the radius of the cylindrical body 2, the liquid flows out in a state where a large number of large bubbles exist in the liquid. In the case where the longitudinal direction is arranged to be vertical, the depth of the liquid stored in the liquid storage portion 42 becomes as deep as about half of the longitudinal direction of the cylindrical body 2, but the interface 40 between the gas and the liquid is Since it is formed only about the cross-sectional area of the cylindrical body 2, the efficiency of mixing and stirring is low, which is not preferable. It can be done.

  As a result, it is possible to improve the efficiency of mixing and stirring described above and prevent the outflow of large bubbles simply by inclining the cylindrical body 2 having a substantially cylindrical shape, and the configuration is simple and the manufacture is easy. Therefore, the manufacturing cost is not increased, and the apparatus is not complicated or enlarged, so that the space can be saved.

  And by providing the elongate member 8 like this invention, the contact area of gas and a liquid becomes small by forming a big bubble and an air pocket, and the melt | dissolution rate to the liquid of a gas becomes slow. In addition, it is possible to prevent large bubbles or air pockets from flowing out of the outlet 32.

  Further, as in the embodiment shown in FIG. 4, the injection port 31 is formed at a position offset (shifted) to the left and right from the lower end of the left and right central portion in the cross section perpendicular to the longitudinal direction of the cylindrical body 2. The elongate member 8 may be disposed in the structure in which the gas-liquid mixed fluid is ejected toward the head. The gas-liquid mixed fluid ejected from the ejection port 31 becomes a swirl flow that swirls along the inner wall surface on the left and right sides of the cylindrical body 2, and the gas (bubbles) easily collects on the central axis i of the side wall portion 21 by centrifugal force. However, by providing the long member 8, the space in which the air pocket is formed is reduced or eliminated, and the bubbles are connected to make it difficult to form a large bubble or an air pool. Thereby, by providing the long member 8, it is prevented that the contact area between the gas and the liquid is reduced due to the formation of large bubbles and air pockets, and the dissolution rate of the gas in the liquid is reduced. Further, it is possible to prevent large bubbles or air pockets from flowing out from the outlet 32.

  Further, as in the embodiment shown in FIG. 5, the longitudinal direction of the long member 8 may be slightly inclined from the central axis A of the substantially cylindrical side wall portion 21. In the present embodiment, the end portion on the upstream side A is inclined upward and the end portion on the downstream side B is inclined downward with respect to the central axis A. Thereby, even when turning around the central axis A of the side wall portion 21, the agitation is performed, and it is difficult to form a large bubble or an air pocket in the portion of the central axis A.

  Further, as shown in FIG. 5, an elongate member 8 is formed of a hollow member having a hollow portion therein, and an air inflow port communicating with the internal hollow portion at a portion close to the outflow port 32 of the long member 8. In addition to forming 81, an air outlet 82 communicating with the internal cavity may be formed in a portion of the long member 8 adjacent to the injection port 31.

  Although it is difficult for the long member 8 to form a large bubble or air reservoir, it may be formed slightly. However, the formed large bubble or air reservoir flows into the long member 8 from the air inlet 81 and moves upward. And flows out from the air outlet 82. As a result, large bubbles or air pockets that could not be dissolved are returned into the gas storage portion 41 via the long member 8, and the large bubbles and air pools flow out from the outlet 32 of the cylindrical body 2. It is further prevented.

  Further, as shown in FIG. 5, a known nozzle, for example, a tapered nozzle is engaged and attached to the injection port 31, or the cross-sectional area becomes smaller as the shape of the injection port 31 goes inward of the cylindrical body 2. It is good also as a shape narrowed down to. Thereby, the ejection direction from the ejection port 31 can be easily changed, and the flow rate of the gas-liquid mixed fluid can also be changed. And the efficiency of mixing and stirring can be further improved by increasing the flow velocity of the gas-liquid mixed fluid ejected from the ejection port 31.

It is a perspective view of one embodiment of the gas dissolution apparatus of the present invention. Sectional drawing of embodiment same as the above is shown, (a) is a longitudinal sectional view along the longitudinal direction, and (b) is an AA sectional view of (a). It is a whole block diagram of the bathtub apparatus provided with the gas dissolving apparatus. It is sectional drawing in the surface perpendicular | vertical to the longitudinal direction of the gas dissolving apparatus of other embodiment. Furthermore, sectional drawing of the gas dissolving apparatus of other embodiment is shown, (a) is a longitudinal cross-sectional view along a longitudinal direction, (b) is AA sectional drawing of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas dissolving apparatus 2 Cylindrical body 21 Side wall part 31 Injection port 32 Outlet port 33 Outlet port 40 Interface 41 Gas storage part 42 Liquid storage part 51 Inflow pipe 52 Outflow pipe 8 Long member A Upstream side B Downstream side Central axis B horizontal direction

Claims (4)

  Provided with a substantially cylindrical cylindrical body closed at both ends, storing gas and liquid in the cylindrical body, and jetting and stirring a gas-liquid mixed fluid in which the gas and liquid are mixed in the cylindrical body A gas dissolving device for dissolving a gas in a liquid, wherein the cylindrical body is disposed such that its central axis is inclined with respect to the horizontal direction, and is disposed in an intermediate portion of the substantially cylindrical side wall portion of the cylindrical body. The gas-liquid interface is located in the cylindrical body, and the part above the interface in the cylindrical body is used as the gas storage part and the part below the interface is used as the liquid storage part. In addition to providing an injection port for injecting the gas-liquid mixed fluid into the cylindrical body in the portion where the part is located, an outlet for allowing the liquid in the cylindrical body to flow out is provided near the lower end of the liquid storage part of the cylindrical body, In the longitudinal direction of the side wall portion so as to be substantially along the central axis of the substantially cylindrical side wall portion. Gas dissolution apparatus characterized by comprising providing an elongated rod-shaped member extending in the outlet from the injection port.   2. The gas dissolving apparatus according to claim 1, wherein the long member is arranged so that a longitudinal direction thereof is inclined from a central axis of the substantially cylindrical side wall portion.   The long member is formed of a hollow member having a hollow portion therein, and an air inflow port communicating with the hollow portion is formed in a portion located in the liquid storage portion of the long member, and in the gas storage portion of the long member. The gas dissolving device according to claim 1 or 2, wherein an air outlet port communicating with the hollow portion is formed in the portion located. The tapered nozzle is attached to the injection port, or the shape of the injection port is narrowed so that the cross-sectional area decreases toward the inside of the cylindrical body. The gas dissolving apparatus as described.

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