JP5075230B2 - Microbubble generator - Google Patents

Description

  The present invention relates to a microbubble generator.

  2. Description of the Related Art Conventionally, as disclosed in Patent Document 1, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-133707, a microbubble generating device that generates a fine bubble by once dissolving a gas in a liquid and then precipitating the gas from the liquid is generated. A gas mixing part for obtaining a gas mixed liquid by mixing the gas flowing into the liquid, a pump for pressurizing the gas mixed liquid and flowing it to the flow path, and having a liquid layer and a gas layer inside and supplying the gas mixed liquid to the gas There are provided a gas-liquid dissolution tank for dissolving a gas in a liquid to obtain a gas-dissolved liquid, and a fine bubble generating part for generating a fine bubble by depositing a gas in the gas-dissolved liquid.

  Here, in order to obtain the effect of fine bubbles, it is necessary to generate a large amount of fine bubbles, which is largely dependent on the amount of gas dissolved in the liquid in the gas-dissolved liquid, that is, the gas in the gas-liquid dissolution tank. The dissolution efficiency in the liquid is an important factor in the microbubble generator. In addition, it is known that dissolution of a gas into a liquid, for example, can dissolve a larger amount of gas into a liquid as it is performed at a higher pressure. However, a pump that sends a gas mixture to a gas-liquid dissolution tank has a higher output. Although it is possible to improve the efficiency of gas-liquid dissolution in the gas-liquid dissolution tank, in this case, there is an adverse effect that the fine bubble generating device is enlarged by a high output pump. there were.

JP-A-6-205812

  The present invention has been made in view of the above-described conventional problems, and provides a microbubble generator capable of improving the efficiency of gas dissolution in a gas-liquid dissolution tank while reducing the size of the apparatus. This is a problem.

In order to solve the above-mentioned problem, a fine bubble generating apparatus according to claim 1 of the present invention includes a gas mixing unit 3 that obtains a gas mixed liquid by mixing a gas into the liquid flowing through the flow path 2 into the flow path 2 through which the liquid flows. , A pump 4 that pressurizes the gas mixture liquid and flows it to the flow path 2, and has a liquid layer 10 and an undissolved gas gas layer 11 inside, and a gas mixture liquid is supplied to dissolve the gas in the liquid, thereby dissolving the gas. A gas / liquid dissolving tank 5 is provided, and a micro-bubble generating device 1 provided with a micro-bubble generating unit 6 that deposits gas in a gas-dissolving liquid to generate micro-bubbles, and is supplied with a gas mixed liquid. An inlet 12 of the dissolution tank 5 is provided facing the liquid layer 10, and a gas mixed liquid is sprayed from the inlet 12 toward the gas-liquid interface 17 through the liquid layer 10 to form a jet stream 14, A divergent jet 14 leading to the gas-liquid interface 17 The opposite ends of the distal portion is positioned in the vicinity of the interior wall surface of the gas-liquid dissolving tank 5 to form an injection zone 15 of the gas-liquid interface 17, substantially to separate the non-injection region 16 in the injection zone 15, The end of the divergent jet flow 14 reaches an injection region 15 provided in a part of the gas-liquid interface 17, and the injection region 14 does not reach the gas-liquid interface 17 adjacent to the injection region 15. The non-injection area 16 having a larger area than 15 is provided over the entire circumference of the injection area 15.

  According to this, since the jet flow 14 is diverged and reaches the gas-liquid interface 17 at the end thereof, a long outer edge length 20 in the portion of the jet flow 14 reaching the gas-liquid interface 17 can be secured. That is, the collision length between the jet stream 14 and the gas layer 11 and the liquid layer 10 can be increased, and the gas in the gas layer 11 is changed to the liquid layer 10 by the impact of the collision with the jet stream 14, the gas layer 11, and the liquid layer 10. A large amount can be taken into the jet flow 14 and the liquid layer 10 whose volume is increased by the taken-in gas can be raised from the non-injection region 16 where the jet flow 14 does not reach the gas layer 11. The area of the gas-liquid interface 17 can be increased, and the divergent jet flow 14 can take a large liquid-layer contact surface 22 that contacts the liquid layer 10 before reaching the gas-liquid interface 17. The surface 22 rubs liquids Gas mixed in a by jet 14 or the liquid layer 10 at high pressure section Una is prone sites is dissolved in the jet 14 or the liquid layer 10. Since the contact area between the gas and the liquid is increased as described above or the high-pressure portion that is easily dissolved is formed, the gas-liquid dissolution efficiency in the gas-liquid dissolution tank 5 can be improved. It is not necessary to use the high-output pump 4 to improve the dissolution efficiency, and the low-output pump 4 can be used, and the microbubble generator 1 can be miniaturized.

Further , the opposite end portions of the end portion of the divergent jet flow 14 reaching the gas- liquid interface 17 are positioned in the vicinity of the wall inner surface of the gas-liquid dissolution tank 5 to form an injection region 15 of the gas-liquid interface 17; By dividing the non-injection area 16 in the injection area 15, the swirl flow 18 in the gas-liquid dissolution tank 5 caused by the collision of the injection flow 14 with the gas-liquid interface 17 is changed to the divided non-injection area 16. As a result, the liquid layer 10 can be easily raised toward the gas layer 11 in the non-injection region 16, and the increase in the area of the gas-liquid interface 17 can be promoted. The dissolution efficiency in the liquid can be further improved.

Further, the fine bubble generating device according to claim 2, characterized in that the jet 14 impinging member 23 impinging from the inlet 12 is disposed in Claim 1 Oite, the gas-liquid dissolving tank 5. According to this, the collision pressure to the collision material 23 can be given to the jet flow 14, that is, a high pressure part can be formed in the jet flow 14, and the dissolution efficiency of the gas in the liquid can be improved.

According to a third aspect of the present invention , the fine bubble generating device according to the first or second aspect is characterized in that the mesh body 24 is disposed in the flow path 2 through which the gas mixed liquid flows. According to this, the gas mixed in the gas mixture liquid can be subdivided by passing through the mesh body 24, that is, the contact area between the gas and the liquid can be increased, and the dissolution efficiency of the gas in the liquid can be improved. .

  Since the present invention has improved the dissolution efficiency of the gas and liquid in the gas-liquid dissolution tank, a high-power pump is used to increase the dissolution efficiency of the gas-liquid dissolution tank that has been generally performed conventionally. However, it is possible to avoid an increase in the size of the fine bubble generation device associated with the use of a high-power pump and to reduce the size of the fine bubble generation device. Have advantages.

BRIEF DESCRIPTION OF THE DRAWINGS It is a microbubble generator of the reference example for demonstrating embodiment of this invention, (a) is a sectional side view of the principal part, (b) is the gas-liquid explaining an injection area | region and a non-injection area | region It is a top view of a dissolution tank. It is a whole schematic block diagram of the fine bubble generator same as the above. It is a top view of the gas-liquid dissolution tank of the other example same as the above. (A) (b) (c) is a top view of the gas-liquid melt | dissolution tank explaining the injection area | region and non-injection area | region of the other examples same as the above. It is side sectional drawing of the principal part of the microbubble generator of the other example same as the above. It is side sectional drawing of the principal part of the microbubble generator of the other example same as the above. It is a sectional side view of the principal part of the fine bubble generator of embodiment of this invention.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  First, a reference example will be described. The fine bubble generating device 1 of the present reference example is a device that supplies fine bubbles to the bathtub 7 as shown in FIG. 2. Specifically, the bathtub 7 is provided with a suction port 8 and a discharge port 9. Then, a circulation channel 2a that is a channel 2 from the suction port 8 to the discharge port 9 is formed, and gas is mixed in the circulation channel 2a in order from the suction port 8 side into the bath water that is a liquid. Gas mixture part 3, a pump 4 for transporting bath water from suction port 8 to discharge port 9 through circulation channel 2a, and a gas mixture liquid is supplied by pump 4 to dissolve the gas in bath water and gas It is formed by providing a gas-liquid dissolution tank 5 for obtaining a dissolved liquid and a fine bubble generating section 6 for depositing a gas in the gas dissolved liquid to generate fine bubbles. Here, in this reference example, the gas mixing unit 3 has a structure in which air is sucked and mixed into the bath water by the ejector effect of the bath water flowing through the circulation flow path 2a. Alternatively, air may be mixed in the bath water. Moreover, as gas mixed in bath water, things other than air, for example, air with a high oxygen component, etc. can also be used. The fine bubble generating unit 6 is configured by a constricted portion with a reduced diameter of the circulation flow path 2a, and gas is deposited by reducing the pressure of the gas-dissolved liquid at the constricted portion. By the way, the present invention is characterized in that the gas-liquid dissolution tank 5 can improve the dissolution efficiency of the gas into the liquid without increasing the internal pressure of the gas-liquid dissolution tank 5 using the high-power pump 4. This will be described below.

  As shown in FIG. 1, the gas-liquid dissolution tank 5 of this reference example has a liquid layer 10 at the lower part of the hollow interior and an air layer 11 with the undissolved air at the upper part. An inlet 12 connected to the upper surface wall of the tank 5 and supplied with the gas-mixed liquid is provided in the gas-liquid dissolution tank 5, and a fine bubble generator 6 is provided at the lower end of the side wall of the gas-liquid dissolution tank 5. An outlet 13 is provided through which the circulating flow path 2a is connected and from which the gas-dissolved liquid is discharged. In addition, although the external shape of the gas-liquid dissolution tank 5 of this reference example is formed in the hollow cylinder shape as FIG.1 (b), it is not restricted to this, What was formed in the hollow rectangular column shape as FIG. May be used.

  The gas mixture liquid is ejected from the inlet 12 facing the gas layer 11 toward the gas-liquid interface 17 through the gas layer 11. Specifically, a nozzle or the like provided at the inlet 12 of the gas-liquid dissolution tank 5 is provided. Thus, the jet stream 14 of the gas mixture liquid has a divergent shape, and the divergent jet flow 14 reaches the gas-liquid interface 17 at the end of the spread state. Here, a portion of the gas-liquid interface 17 where the jet flow 14 reaches is referred to as an injection region 15, and a portion of the gas-liquid interface 17 where the injection flow 14 does not reach is referred to as a non-injection region 16. Thus, since the jet flow 14 is diverged to reach the gas-liquid interface 17 at the end thereof, the outer edge length 20 in the portion of the jet flow 14 reaching the gas-liquid interface 17 can be secured long, that is, A long collision length between the jet stream 14 and the gas layer 11 and the liquid layer 10 can be ensured, and the gas in the gas layer 11 is discharged by the impact of the collision with the jet stream 14, the gas layer 11, and the liquid layer 10. A large amount can be taken into the layer 10, and the gas / liquid contact area is increased by the taken-in gas. Of course, according to this collision, the high-pressure portion can be locally formed, so it goes without saying that the dissolution efficiency of the gas into the liquid under high pressure is improved.

  Further, the injection direction of the outer edge portion of the divergent jet flow 14 is directed not only in the direction (downward) perpendicular to the gas-liquid interface 17 but also in the in-plane direction (horizontal direction) of the gas-liquid interface 17. According to the jet flow 14, it is possible to generate a swirl flow 18 that goes to the adjacent non-jet region 16 immediately after the collision of the gas-liquid interface 17. However, the liquid layer 10 whose volume is increased by the taken-in gas. Can be raised from the non-injection region 16 where the jet flow 14 does not reach toward the gas layer 11 (dotted gas-liquid interface 17), and the area of the gas-liquid interface 17 increases, that is, the contact area of the gas-liquid increases. It has been. Thus, by increasing the contact area of the gas and liquid, the dissolution efficiency of the gas in the liquid is improved. In addition, in the divergent jet flow 14, the gas layer contact surface 21 that comes into contact with the gas layer 11 before reaching the gas-liquid interface 17 can be made large. From 21, a large amount of gas in the gas layer 11 can be taken into the jet flow 14, and also in this respect, the contact area of the gas and liquid is increased, and the dissolution efficiency of the gas into the liquid is improved. .

  More specifically, bubbles are generated by the jet stream 14 colliding with the gas-liquid interface 17, and the gas-liquid interface 17 is covered with the bubbles. Since the bubbles are formed by wrapping the gas with a liquid film, the contact area of the gas and liquid is increased more than the area of the gas-liquid interface 17, and in this respect also, the efficiency of dissolving the gas in the liquid is improved. It is illustrated. The jet flow 14 is composed of a gas mixture liquid, and bubbles are already mixed in the gas mixture liquid. Therefore, bubbles are generated when the jet flow 14 collides with the gas-liquid interface 17. Needless to say, is promoted. Furthermore, if the bubbles are filled in almost all of the gas layer 11, the bubbles can be brought into contact with the gas layer contact surface 21 of the jet stream 14, and the bubbles are taken into the jet stream 14. Thus, the contact area of the gas and liquid can be increased, and the dissolution efficiency of the gas in the liquid can be improved.

  More specifically, FIG. 1 (b) shows a horizontal section of the gas-liquid dissolution tank 5, but the non-injection area 16 is divided into two or more by the injection area 15 at the gas-liquid interface 17 in this way. ing. That is, in the present reference example, the injection region 15 is formed so that the opposite end portions of the end portion of the spray flow 14 that extends toward the gas-liquid interface 17 are positioned in the vicinity of the inner surface of the side wall of the gas-liquid dissolution tank 5. It has been done. Thus, since the non-injection area | region 16 divided | segmented in the injection area | region 15 is formed in the gas-liquid interface 17 of this reference example, the swirl flow 18 produced by the collision with the injection area | region 15 of the injection flow 14 is divided | segmented. It is possible to form a stable flow with no loss toward the non-injection region 16, and the liquid layer 10 is easily raised in the non-injection region 16, and an increase in the area of the gas-liquid interface 17 is promoted. In this respect, the contact area of the gas and liquid is increased, and the dissolution efficiency of the gas in the liquid is improved.

  Here, the injection area 15 formed by the injection flow 14 is formed in a substantially elliptical shape in plan view as shown in FIG. 1B in the present reference example, and both ends in the major axis direction are the gas-liquid dissolution tank 5. The non-injection regions 16 that are located in the vicinity of the inner surface of the side wall and are divided into two adjacent to each other in the minor axis direction are not limited to this. For example, FIG. It is also preferable to do as in (c). The injection region 15 in FIG. 4A is formed so as to divide the non-injection region 16 into four so that the injection regions 15 having the same shape as in FIG. 4 (b), the injection regions 15 having the same shape as in FIG. 1 (b) are arranged in parallel with a gap in the gas-liquid interface 17 so that the non-injection regions 16 are located. Each of the non-injection regions 16 is formed so as to be divided into three, and the injection region 15 in FIG. 4C is formed in a ring shape and divided into two at the inner periphery and the outer periphery, respectively. Is located.

    Further, in order to further improve the dissolution efficiency of the gas in the gas-liquid dissolution tank 5, for example, it is also preferable as shown in FIGS. 5 and 6. In the example of FIG. 5, the mesh body 24 is disposed in the vicinity of the inlet 12 of the gas-liquid dissolution tank 5 so as to block the flow path 2 through which the gas mixed liquid flows. According to this, the gas mixed with the gas mixed liquid can be subdivided by passing the gas mixed liquid through the mesh body 24, that is, the surface area of the gas per volume in the gas mixed liquid is increased and The contact area can be increased and the internal pressure of the liquid and gas in the gas mixture liquid can be increased, so that the dissolution efficiency of the gas in the liquid can be improved. Further, in the example of FIG. 6, a collision material 23 that causes the jet flow 14 from the inlet 12 to collide with the gas layer 11 of the gas-liquid dissolution tank 5 is provided. According to this, it is possible to apply a collision pressure to the collision material 23 to the jet flow 14 that is a gas mixed liquid, that is, a local high-pressure portion can be formed in the jet flow 14. Since dissolution of the mixed gas into the liquid is facilitated, the dissolution efficiency of the gas into the liquid can be improved. Moreover, when the jet stream 14 collides with the collision material 23 arranged in the gas layer 11 as in this reference example, the gas in the gas layer 11 can be taken into the jet stream 14 by the impact, and the gas-liquid By increasing the contact area, it is possible to contribute to the improvement of the dissolution efficiency of the gas in the liquid.

An embodiment of the present invention will be described. As shown in FIG. 7, the inlet 12 of the gas-liquid dissolution tank 5 to which the gas mixed liquid is supplied may be provided on the bottom wall of the gas-liquid dissolution tank 5. Specifically, the inlet 12 provided on the bottom wall of the gas-liquid dissolution tank 5 is opened upward facing the liquid layer 10, and the jet flow 14 in a divergent form of the gas mixture liquid from the inlet 12 is the liquid layer 10. To reach the gas-liquid interface 17. In other words, since the diverging jet flow 14 reaches the gas-liquid interface 17 at the end portion in the spread state, the gas-liquid interface 17 of the jet flow 14 is formed in the same manner as in the reference example of FIG. The outer edge length 20 can be ensured to be long, and a large amount of the gas in the gas layer 11 can be taken into the jet flow 14 and the liquid layer 10, and the contact area between the liquid and the gas is increased by the gas taken in the liquid layer 10. In addition, the liquid layer 10 whose volume is increased by the taken-in gas rises from the non-injection area 16 where the injection flow 14 does not reach and increases the area of the gas-liquid interface 17. Improvement of dissolution efficiency is achieved. Further, in this example, the liquid layer contact surface 22 that comes into contact with the liquid layer 10 before the divergent jet flow 14 reaches the gas-liquid interface 17 can be made large. Here, this liquid layer contact surface Since 22 is a high-pressure portion where the liquids rub against each other, the gas mixed in the jet stream 14 or the liquid layer 10 is easily dissolved in the jet stream 14 or the liquid layer 10. The improvement is aimed at. Note that FIG shape of the injection region 15 in this example 4 (a), also preferred for the as in (b), however, also provided a mesh member 24 in a flow path 2 through which the gas liquid mixture as in FIG. 5 It is also preferable to arrange an impact member 23 that causes the jet stream 14 to collide as shown in FIG. When the impact material 23 is disposed in the liquid layer 10, the liquid of the liquid layer 10 can be taken into the jet stream 14 by the impact of the collision of the jet stream 14, and the jet stream 14 and the liquid layer 10 By increasing the contact area (liquid layer contact surface 22), the dissolution efficiency of the gas mixed in the gas mixed liquid into the liquid can be improved.

  In the fine bubble generating apparatus 1 in the above embodiment, the gas-liquid dissolution tank 5 has an increased dissolution efficiency between gas and liquid, and thus increases the dissolution efficiency of the gas-liquid dissolution tank 5 that has been generally performed conventionally. In other words, it is not necessary to use the high-output pump 4, and the enlargement of the microbubble generator 1 associated with the use of the high-output pump 4 can be avoided. It is. This is particularly useful when the fine bubble generator 1 must be installed in a limited space such as in a bathroom, such as the fine bubble generator 1 that supplies fine bubbles to the bathtub 7. Of course, the fine bubbles generated by the fine bubble generator 1 have a low ascent rate and can stay in the liquid for a long time, and in the state where the fine bubbles are contained in the liquid, it is possible to obtain a white turbid appearance like hot spring water. In addition, since the surface area per volume is large and the dirt in the liquid is adsorbed and floated, the water quality can be purified, so that fine bubbles are supplied not only to the bathtub 7 but also to the septic tank and the skein. Of course, in this case, it is needless to say that the space can be saved by reducing the size of the microbubble generator 1.

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 2 Flow path 3 Gas mixing part 4 Pump 5 Gas-liquid dissolution tank 6 Fine bubble generation part 10 Liquid layer 11 Gas layer 14 Injection flow 15 Injection area 16 Non-injection area

Claims (3)

A gas mixing section that mixes gas into the liquid flowing through the flow path to obtain a gas mixed liquid, a pump that pressurizes the gas mixed liquid and flows it through the flow path, and a liquid layer and an undissolved gas inside A gas-liquid dissolution tank that has a layer and is supplied with a gas mixed liquid to dissolve the gas in the liquid to obtain a gas-dissolved liquid, and a micro-bubble generator that deposits the gas in the gas-dissolved liquid and generates fine bubbles A gas bubble-liquid dissolution tank to which a gas mixture liquid is supplied is provided with an inlet facing the liquid layer, and the gas mixture liquid is directed from the inlet to the gas-liquid interface through the liquid layer. Injecting in a divergent form to form a jet stream, and injecting the gas-liquid interface by positioning the opposite ends of the end part of the divergent jet stream that reaches the gas-liquid interface in the vicinity of the wall inner surface of the gas-liquid dissolution tank A non-injection area in this injection area Is pot divided, brought to the injection region provided in a part of the gas-liquid interface at the end of this flared jetting flow, than the gas-liquid the injection range jet does not reach adjacent to the injection region at the interface A fine bubble generator characterized in that a non-injection area having a large area is provided over the entire circumference of the injection area. 2. The fine bubble generating device according to claim 1, wherein a collision material for colliding the jet flow from the inlet is disposed in the gas-liquid dissolution tank. The fine bubble generating apparatus according to claim 1 or 2, wherein a mesh body is disposed in a flow path through which the gas mixed liquid flows.

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