JP5025631B2 - Microbubble injection system for liquid - Google Patents

Description

  The present invention relates to a microbubble injection system into a liquid for generating microbubbles called microbubbles and injecting the generated microbubbles into a liquid.

  Microbubbles injected into water with a bubble diameter of about 100 μm are called microbubbles, and based on their chemical or physical characteristics, various effects such as sterilization effects and frictional resistance reduction effects can be obtained. Therefore, it is expected to be used in various industrial fields.

  Various types of microbubble generators that generate such microbubbles are known. For example, in the apparatus according to Patent Document 1, microbubbles are generated by supplying gas through a porous body from a gas supply means such as a compressor to a pipe through which water flows.

In addition, in the apparatus according to Patent Document 2, a pressurized liquid introduction port is provided on the peripheral surface portion near the bottom surface, a gas introduction hole is provided on the bottom surface side, and a top portion of the rotation container body is provided on the cone-shaped rotation container body. Has a structure in which a swirling gas-liquid outlet hole is provided. Then, a large shearing force is applied to the bubble surface by utilizing the difference in swirling speed between the liquid and the gas heading toward the outlet hole while turning, and a large amount of minute air is pulled off from the outlet hole by this shearing force. Air bubbles are generated.
JP-A-8-2225094 JP 2003-205228 A

  However, in the case of the apparatus according to Patent Document 1, since the bubbles are difficult to separate from the porous body, the generated bubbles are larger than the pore diameter of the porous body, and there is a disadvantage that sufficiently small bubbles cannot be obtained. ing.

  In addition, in the case of the device according to Patent Document 2, fine bubbles can be obtained as compared with Patent Document 1, but since it is necessary to give a swirl flow to the liquid, the pressure loss increases and the gas in the liquid This ratio has a disadvantage that it is lower than that of Patent Document 1.

  Thus, in general, in the conventional microbubble generator, the bubble diameter and the required energy are in a so-called trade-off relationship. In other words, if it is attempted to generate bubbles having a sufficiently small bubble diameter, a large amount of energy is required. On the other hand, if energy is reduced, only bubbles having a large bubble diameter can be obtained.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a microbubble injection system into a liquid that can efficiently generate microbubbles having a sufficiently small bubble diameter with a small amount of energy. .

  As means for solving the above-mentioned problems, the invention described in claim 1 is characterized in that a micro-bubble is introduced into a storage tank in which a liquid to be injected with micro-bubbles is stored and liquid introduced from the storage tank through an introduction line. A microbubble generator for injecting and returning the liquid after microbubble injection to the storage tank via a return line, and a gas for generating microbubbles to the microbubble generator via the gas supply line. Gas supply means for supplying the gas, and the microbubble generator is provided in a sealed container connected to the introduction line and the return line, and is disposed inside the sealed container, and supplies the gas from the gas supply means. A hollow member to be introduced is formed inside, a disk member having a large number of bubble injection holes formed on the disk surface, and motor means disposed outside the hermetic container and driving the disk member to rotate. Please , Moreover, the pitch spacing of the plurality of bubble injection holes formed in the board of the disk member is not less than a predetermined length, characterized in that.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a return pump is disposed in the return line.

  According to a third aspect of the present invention, in the first aspect of the present invention, the introduction port and the discharge port of the sealed container connected to the introduction line and the return line rotate the disk member in the introduction direction and the discharge direction. It is formed so that it may become the direction which produces the turning flow of a direction.

  According to a fourth aspect of the present invention, in the invention according to the third aspect, the sealed container has a substantially trumpet-shaped cylindrical shape in which the diameter on the ceiling side is larger than the diameter on the bottom side, and the introduction port has a ceiling. The discharge port is formed on the side surface near the bottom, and the discharge port is formed on the side surface near the bottom.

  According to a fifth aspect of the present invention, in the third aspect of the invention, a rotary blade member that receives the resistance of the swirling flow is attached to the disk member.

  According to a sixth aspect of the present invention, in the first aspect of the present invention, when coarse bubbles are generated in the liquid and the coarse bubbles stay in the vicinity of the ceiling of the sealed container, the coarse bubbles are sealed. Coarse bubble discharging means for discharging from the inside of the container and returning to the gas supply line is provided.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, a coarse bubble retention chamber is provided in the vicinity of the ceiling portion of the sealed container, and the coarse bubble discharge means is a coarse bubble accumulated in the coarse bubble retention chamber. It is characterized in that it discharges.

  The invention according to claim 8 is the invention according to claim 1, wherein ultrasonic generating means for eliminating large bubbles or coarse bubbles generated in the liquid in the sealed container is attached to the outside of the sealed container. It is characterized by that.

  The invention according to claim 9 is the invention according to claim 1, characterized in that a bubble crushing member is formed on at least one of the disk surface of the disk member and the inside of the ceiling portion of the sealed container.

  According to the present invention, microbubbles having a sufficiently small bubble diameter can be efficiently generated with less energy.

  FIG. 1 is an overall configuration diagram of a system according to a first embodiment of the present invention. A liquid 1 to be injected with microbubbles is stored in a storage tank 2. One end side of the introduction line 3 is connected near the bottom of the storage tank 2, and the other end side of the introduction line 3 is connected to the microbubble generator 4.

  The microbubble generator 4 injects the generated microbubbles 5 into the liquid 1 sent from the storage tank 2 via the introduction line 3. The microbubble generator 4 injects microbubbles into the liquid 1 and then returns it to the storage tank 2 via the return line 6 and the return pump 7.

  The microbubble generator 4 is provided in a sealed container 8 in which an introduction line 3 and a return line 6 are connected to a ceiling part and a side surface near the ceiling part, respectively, and the inside of the sealed container 8, and a hollow part is formed inside. And a drive motor 11 that is disposed outside the sealed container 8 and that rotates the disk member 9 via the rotation shaft 10.

  A rotary joint 12 is attached to an intermediate portion of the rotary shaft 10, and a blower 14 as a gas supply unit is connected to the rotary joint 12 via a gas supply line 13. In the rotary shaft 10, the lower part of the rotary joint 12 is solid, but the upper part of the rotary joint 12 is hollow (pipe-like). Therefore, the air sent from the blower 14 passes through the gas supply line 13, the rotary joint 12, and the hollow portion of the rotary shaft 10 and is supplied to the hollow portion formed inside the disk member 9.

  In the present embodiment, it is assumed that the liquid 1 is water, but in the present invention, in addition to water, a chemical agent such as a weak acid or a strong acid, or oil is also included in the liquid 1. Moreover, although air is assumed in this embodiment as gas for microbubble generation, in this invention, ozone etc. shall also be included.

  FIG. 2 is an explanatory view showing the structure of the disk member 9 and the sealed container 8 in FIG. 1, (a) is a longitudinal sectional view of the disk member 9 and the sealed container 8, and (b) is a BB of (a). It is an arrow view.

  As shown in FIG. 2A, an inlet 8a connected to the introduction line 3 is provided in the ceiling portion of the sealed container 8, and a discharge port 8b connected to the return line 6 is provided on the side surface near the ceiling portion. Yes. A disk member 9 is disposed inside the sealed container 8.

  The disk member 9 has a hollow portion 9a formed therein and a large number of bubble injection holes 9b formed in the upper surface portion. Then, one end side of the air supply pipe 10 a that forms a part of the rotating shaft 10 is attached to the center of the lower surface side of the disk member 9. In addition, although illustration is abbreviate | omitted, attachment of the air supply pipe 10a with respect to the airtight container 8 is performed via a bearing member etc., and favorable watertightness is maintained.

  As shown in FIG. 2 (b), a large number of bubble injection holes 9 b are formed in a set region R set in a donut shape near the periphery of the disk surface on the upper surface side of the disk member 9. This set region R is set as a region in which the peripheral speed of the bubble injection hole 9b during the rotation of the disk member 9 is equal to or higher than a predetermined speed. These bubble injection holes 9b are formed at a predetermined pitch P on the same concentric circle for each of a plurality of radii R1, R2, and R3.

  By the way, the inventors of the present invention can determine the average diameter of the microbubbles 5 generated when the hole diameter, the number of holes, the peripheral speed, the pitch P, the gas flow rate, and the like of the bubble injection holes 9b are variously changed. I have been experimenting and investigating how it changes. 3 to 6 are characteristic diagrams showing the results of this experiment and investigation.

  FIG. 3 is a characteristic diagram showing the relationship between the change in peripheral speed and the average bubble diameter for a plurality of bubble injection holes with different hole diameters. This characteristic diagram shows the case where there are three types of bubble injection hole diameters of 1.0 mm, 0.5 mm, and 0.1 mm. According to this characteristic diagram, as the peripheral speed increases, the generated bubble average diameter gradually decreases, but when the peripheral speed is 6 [m / s] or less, the bubble diameter of the bubble injection hole decreases as the peripheral diameter decreases. The average bubble diameter can be reduced. However, when the peripheral speed exceeds 6 [m / s], the generated bubble average diameter of any hole diameter reaches the limit level of 200 μm and is almost the same.

  In general, the pressure loss in the bubble injection hole becomes smaller as the hole diameter becomes larger. Therefore, it is preferable that the hole diameter is larger from the viewpoint of energy reduction of equipment such as the blower 14. According to the characteristic diagram of FIG. 3, even if the hole diameter is large, it is possible to obtain the generated bubble average diameter equivalent to that of the small hole diameter by making the peripheral speed larger than 6 [m / s]. Has been revealed.

  FIG. 4 is a characteristic diagram showing the relationship between the change in peripheral speed and the generated bubble average diameter when different gas flow rates are supplied to a disk member having a bubble injection hole with a specific hole diameter. This characteristic diagram shows that the diameter of the bubble injection hole is 1.0 mm (maximum hole diameter in FIG. 3), the number of holes is four, and the gas flow rate is 0.2 liter / minute, 0.5 liter / minute, 1 liter / minute, 2 liter / minute. This shows the case of four types of minutes. According to this characteristic diagram, in the case of the first to third gas flow rates, when the peripheral velocity is 6 [m / s] or less, the smaller the gas flow rate, the smaller the generated bubble average diameter, but the peripheral velocity is 6 [m / s]. Above [s], the average bubble diameter of any gas flow rate is the same.

  However, the fourth gas flow rate of 2 liters / min shows different characteristics from the other gas flow rates, and the average bubble diameter is much larger even if the peripheral speed is increased. ing. From this, it is clear that there is a limit value for the gas flow rate, and it is not preferable to supply a gas flow rate exceeding the limit value in order to generate a large amount of microbubbles.

  FIG. 5 is a characteristic diagram showing the relationship between the change in peripheral speed and the average diameter of generated bubbles when different gas flow rates are supplied to a disk member having a specific number of bubble injection holes with a specific hole diameter. This characteristic diagram shows the case where the diameter of the bubble injection hole is 1.0 mm, the number of holes is 8 (twice that in the case of FIG. 4), and the gas flow rate is 2 liters / minute and 2 liters / minute. It is a thing. In the characteristic diagram of FIG. 4, when the gas flow rate is 2 liters / minute, the generated bubble average diameter could not be made sufficiently small even if the peripheral speed was increased. However, in the characteristic diagram of FIG. If the number of bubble injection holes is increased, the peripheral velocity is made larger than 6 [m / s], so that microbubbles having a sufficiently small diameter can be obtained as in the case of other gas flow rates in FIG. I understand that.

  FIG. 6 shows a bubble injection hole when a disk member having a plurality of bubble injection holes is rotated at a certain rotation speed (for example, a speed at which the peripheral speed of the bubble injection hole position is 6 [m / s] or more). It is a characteristic view which shows the relationship between the change of a pitch, and the bubble generation average diameter. This characteristic diagram is obtained when the number of bubble injection holes is increased or decreased within a certain range.

  According to the characteristic diagram of FIG. 5, it is possible to obtain bubbles having a sufficiently small diameter by increasing the number of holes even for a bubble injection hole having a large hole diameter. However, if the number of holes is increased too much, the pitch of the holes will inevitably become narrower, and the microbubbles will stick together and the bubble diameter will increase. According to the characteristic diagram of FIG. 6, it is apparent that the average diameter of the generated bubbles is remarkably increased when the pitch of the bubble injection holes is narrower than 15 mm.

  According to the characteristic diagrams of FIGS. 3 to 6 described above, the rotational speed of the disk member 9 is such that the peripheral speed of all the bubble injection holes 9b formed in the setting region R in FIG. s] is preferable, and the pitch P between adjacent bubble injection holes 9b is preferably 15 mm or more.

  Next, the operation of this embodiment will be described. The drive motor 11 starts rotating, the blower 14 is activated, and the return pump 7 is also activated. Air taken into the blower 14 from the atmosphere is supplied to the hollow portion 9a of the disk member 9 through the gas supply line 13, the rotary joint 12, and the air supply pipe 10a. And the air with which the cavity part 9a was filled is inject | poured in the liquid 1 (water) with which the inside of the airtight container 8 is filled as the microbubble 5 from many bubble injection holes 9b.

  At this time, the microbubbles 5 that are generated from the bubble injection hole 9 b and are about to be injected into the water are shear forces generated by the relative motion between the rotating disk member 9 and the water existing around the disk member 9. Is removed from the bubble injection hole 9b and injected into water. The magnitude of the shearing force at this time is large because the bubble injection hole 9b is formed in the set region R and rotates at a high speed. Therefore, the microbubbles 5 that are exposed from the bubble injection hole 9b are immediately torn off from the bubble injection hole 9b with a strong shearing force before growing into bubbles having a large diameter, Injected into. At this time, since the pitch P between the bubble injection holes 9b is 15 mm or more, the fine bubbles torn from the bubble injection holes 9b are suppressed from sticking to each other, so that the bubble diameter is also prevented from increasing. That is, according to the configuration of the present embodiment, it is possible to efficiently generate microbubbles having a sufficiently small bubble diameter with a small amount of energy.

  In addition, when the return pump 7 is activated, water is introduced into the sealed container 8 from the inlet 8a. The water is discharged from the outlet 8b to the outside of the sealed container 8 after the microbubbles 5 are injected. . At this time, in FIG. 2B, the rotation direction of the disk member 9 is a counterclockwise direction (counterclockwise direction), and the discharge direction of the discharge port 8 b is a tangential direction of the disk member 9. The rotation of the disk member 9 by the drive motor 11 causes a swirling flow of water in the sealed container 8. Since the discharge port 8 b is formed in the tangential direction of the disk member 9 in this way, the sealed container 8. The water inside is discharged from the discharge port 8b to the return line 6 very smoothly. Further, since the turning direction of the swirling flow is, of course, the same as the rotation direction of the rotating shaft 10 of the drive motor 11, this swirling flow supports the rotational driving force of the driving motor 11.

  Therefore, according to the sealed container 8 in the present embodiment, the energy required for the return pump 7 and the drive motor 11 can be reduced, and the return pump 7 and the drive motor 11 do not need to have a large capacity. We can expect to be finished.

  Many of the system configurations proposed by the inventors of the present invention have been of the type in which the disk member 9 is disposed in the liquid 1 of the storage tank 2. In the case of such a type of system configuration, if the drive motor 11 is also disposed in water together, the drive motor 11 must be a submersible motor, which is disadvantageous in terms of cost or maintenance. It was. Further, when an air motor is used as the drive motor 11, the drive motor 11 must be disposed above the water surface or below the bottom surface of the storage tank 2, and the installation structure has to be complicated. . Furthermore, when the storage tank 2 is a sewage treatment tank, it is necessary to use a motor with a large capacity in consideration of severe dirt, or some considerations such as clogging of the bubble injection hole 9b are necessary. It has a disadvantage.

  However, in the configuration of FIG. 1, a sealed container 8 that is much smaller than the storage tank 2 is installed separately from the storage tank 2, so that an installation structure can be used even if an air motor is used as the drive motor 11. There is no complication. Therefore, the system of the present invention can be easily realized regardless of whether the storage tank 2 is existing or newly installed.

  Further, even when the storage tank 2 is a sewage treatment tank, a filter member can be easily provided at an appropriate location on the introduction line 3, so that it is not necessary to use a large-capacity motor and problems such as clogging. Can also be eliminated.

  FIG. 7 is a main part configuration diagram of a system according to the second embodiment of the present invention. In the sealed container 8 in the first embodiment, as shown in FIGS. 2A and 2B, the introduction port 8a is provided in the ceiling portion, and the discharge port 8b is provided in the side surface near the ceiling portion. However, in the sealed container 8 in FIG. 7, both the introduction port 8 a and the discharge port 8 b are provided on the side surfaces near the ceiling, and the introduction direction and the discharge direction are the tangential direction of the disk member 9. ing.

  Therefore, according to the sealed container 8 having the configuration of FIG. 7, both introduction and discharge can be performed smoothly, so that the energy required for the return pump 7 and the drive motor 11 can be reduced compared to the sealed container 8 of FIG. Further reduction can be achieved. In FIG. 7, the positions in the height direction of the introduction port 8a and the discharge port 8b are not shown, but both are provided at the same height position (the height position of the discharge port 8b in FIG. 2A). It shall be.

  FIG. 8 is a main part configuration diagram of a system according to the third embodiment of the present invention. The closed container 8 in FIGS. 2 and 7 has a straight cylindrical shape in which the diameter on the ceiling side is the same as the diameter on the bottom side, but the sealed container 8A in FIG. Has a substantially trumpet shape that is larger than the diameter on the bottom side. An introduction port 8a is formed on the side surface near the ceiling, and a discharge port 8b is formed on the side surface near the bottom.

  Accordingly, the water introduced into the sealed container 8A from the introduction port 8a becomes a spiral swirling flow that gradually falls toward the discharge port 8b provided at a low position, and vigorously from the discharge port 8b. It will be discharged.

  As described above, in the configuration of FIG. 8, the potential energy generated by the height difference between the inlet 8a and the outlet 8b and the spiral swirl generated by the shape of the sealed container 8A can be effectively used. Therefore, both introduction and discharge can be performed smoothly, and the energy required for the return pump 7 and the drive motor 11 can be further reduced.

  FIG. 9: is a principal part block diagram of the system which concerns on the 4th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is BB of (a). It is an arrow view. As described above, the setting region R is set on the upper surface of the disk member 9, and a large number of bubble injection holes 9b are formed in the setting region R. In the present embodiment, a plurality of rotary blade members 15 are attached to an inner region of the setting region R, that is, a region where the bubble injection hole 9b is not formed.

  These rotary blade members 15 are formed in a shape that causes the disk member 9 to generate a rotational force in the same direction as the rotational drive direction of the drive motor 11 when the flow of water introduced from the introduction port 8a comes into contact therewith. Therefore, in this embodiment, the disk member 9 can be efficiently rotated by the action of the rotary blade member 15 and the energy required for the drive motor 11 and the return pump 7 can be reduced.

  FIG. 10: is a principal part block diagram of the system which concerns on the 5th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is BB of (a). It is an arrow view. In the present embodiment, similar to the fourth embodiment of FIG. 9, the disk member 9 is efficiently rotated by the action of the rotary blade member 16 attached to the disk member 9.

  The rotary blade member 16 is attached to the side surface of the disk member 9, receives the momentum of water introduced from the introduction port 8 a, converts it into a rotational driving force for the disk member 9, and swivels in the sealed container 8. It is provided with the intention of conveying the water to be discharged and expelling it from the discharge port 8b. Therefore, the mounting position of the introduction port 8a (and the discharge port 8b) in the airtight container 8 in the height direction in the present embodiment is substantially the same height as the rotary blade member 16, as shown in FIG. ing.

  In this embodiment, it is possible to perform the rotation of the disk member 9 and the introduction and discharge at the introduction port 8a and the discharge port 8b very efficiently by the action of the rotary blade member 16. Therefore, according to the present embodiment, it is possible to expect further downsizing of the return pump 7 shown in FIG. 1 or even the possibility of omitting the return pump 7.

  FIG. 11 is a main part configuration diagram of a system according to the sixth embodiment of the present invention. In this embodiment, an air trap 18 as a coarse bubble discharging means is attached to the outside of the ceiling portion of the sealed container 8 in the second embodiment (FIG. 7), and the coarse bubbles staying inside the ceiling portion of the sealed container 8. 17 is returned to the gas supply line 13 side through the coarse bubble discharge line 19 and the check valve 20. The check valve 20 is for preventing the gas related to the coarse bubble 17 that has once returned to the gas supply line 13 from returning to the inside of the sealed container 8 through the air trap 18 again.

  The very small microbubbles 5 (microbubbles) generated from the bubble injection hole 9b of the disk member 9 have a unique property different from normal bubbles in that they gradually dissolve and disappear when released into the water. ing. However, depending on the state in the sealed container 8, the generated microbubbles 5 may stick to each other before disappearing, and these may grow into large coarse bubbles 17. Such coarse bubbles 17 stay in the vicinity of the ceiling portion in the sealed container 8, but if this is left as it is, a plurality of coarse bubbles that are generated adhere to each other, and larger coarse bubbles are generated. The function of the bubble generating device 4 is deteriorated.

  According to the present embodiment, the coarse bubbles 17 generated in the sealed container 8 in this way can be discharged to the outside of the sealed container 8, so that the function deterioration of the microbubble generator 4 caused by the coarse bubbles 17 is prevented. can do.

  FIG. 12 is a main part configuration diagram of a system according to the seventh embodiment of the present invention. FIG. 12 differs from FIG. 11 in that a coarse bubble retention chamber 8c is provided near the ceiling of the sealed container 8, and an air trap 18 as a coarse bubble discharge means is attached to the coarse bubble retention chamber 8c. .

  In the case of the sealed container 8 in FIG. 11, since the ceiling portion is flat, the accumulation position of the coarse bubbles 17 sometimes changes greatly, and the coarse bubbles 17 may not be easily discharged out of the sealed container 8. However, in the sealed container 8 of FIG. 12, the accumulation position of the coarse bubbles 17 can be fixed in the coarse bubble accumulation chamber 8c, so that the coarse bubbles 17 can be quickly discharged.

  FIG. 13 is a main part configuration diagram of a system according to the eighth embodiment of the present invention. The configuration of FIG. 13 uses a valve 21 instead of the air trap 18 in FIG. 12 and also arranges a coarse bubble detector 22 in the coarse bubble retention chamber 8 c, and based on the detection signal of the coarse bubble detector 22. A valve control circuit 23 for opening the valve 21 is provided.

  As the coarse bubble detector 22, for example, a switch called “contact type switch” used for a water level sensor or the like may be used. Although a detailed description is omitted, this switch has a pair of contacts, and the presence of the coarse bubble 17 can be detected based on whether or not the pair of contacts are in a conductive state.

  That is, when the pair of contacts are immersed in water, the contact between the contacts is in a conductive state through the water, so the coarse bubble detector 22 outputs an ON signal to the valve control circuit 23. Therefore, in this state, the valve control circuit 23 closes the valve 21. However, when the coarse bubble 17 enters the coarse bubble retention chamber 8c, the pair of contacts is in a non-conductive state due to the presence of the coarse bubble 17, so the coarse bubble detector 22 receives the ON signal so far. Instead, an OFF signal is output to the valve control circuit 23. The valve control circuit 23 receives the off signal and opens the valve 21.

  According to the present embodiment, the normally closed valve 21 is opened only when the coarse bubble 17 is detected, so that the airtightness and watertightness in the hermetic container 8 can be maintained reliably. The coarse bubbles 17 can be discharged out of the sealed container 8.

  FIG. 14 is a main part configuration diagram of a system according to the ninth embodiment of the present invention. FIG. 14 differs from FIG. 13 in that an air pump 24 is used in place of the valve 21 and that the valve control circuit 23 is a pump control circuit 25.

  According to the present embodiment, the coarse bubbles 17 existing in the coarse bubble retention chamber 8c are forcibly discharged by the action of the air pump 24, and the gas related to the coarse bubbles 17 is reliably and quickly supplied to the air supply pipe 10a side. Can be returned to.

  FIG. 15 is a main part configuration diagram of a system according to the tenth embodiment of the present invention. In the present embodiment, generation of ultrasonic waves for eliminating large bubbles (bubbles larger than microbubbles but smaller than coarse bubbles) or coarse bubbles on the outside of the sealed container 8 in the second embodiment (FIG. 7). A device 26 is attached. In the present embodiment, the ultrasonic generator 26 is attached to two places, near the ceiling portion of the sealed container 8 and near the discharge port 8b, but only one of them is taken into consideration in terms of bubble generation. Is also possible.

  According to this embodiment, without providing the components such as the coarse bubble discharge line 19 and the check valve 20 shown in FIGS. 11 to 14, coarse bubbles and the like can be removed with a simple configuration using the function of ultrasonic waves. Can disappear. However, since the ultrasonic generator 26 usually cannot eliminate a large amount of bubbles due to its function, it is preferable to investigate the amount of bubbles generated in advance.

  FIG. 16: is a principal part block diagram of the system which concerns on the 11th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is BB of (a). It is an arrow view. In the present embodiment, a plurality of bubble crushing members 27 are provided on the upper surface of the disk member 9 in the first embodiment.

  In the present embodiment, it is assumed that, for example, a resin columnar member is used as the bubble crushing member 27, but the material, shape, and the like are not particularly limited. Further, the range in which the bubble crushing member 27 is formed is mainly the set region R (of course, except for the bubble injection hole 9b) as shown in FIG. It extends to the outside.

  As described above, the microbubbles released into the water from the bubble injection hole 9b of the disk member 9 have a unique property different from normal bubbles in that they gradually dissolve in the water and disappear. From the injection hole 9b, not only microbubbles but also bubbles having a larger diameter than the microbubbles are generated. Such a large diameter bubble is swirled in the sealed container 8 without disappearing. However, if the bubble is left as it is, the large diameter bubbles adhere to each other and grow into a larger bubble, which is directly discharged into the discharge port 8b. It will be discharged from the tank and sent to the storage tank 2.

  However, according to this embodiment, the plurality of bubble crushing members 27 provided on the upper surface of the disk member 9 crush large bubbles remaining in the sealed container 8 and disappear, and these large bubbles are stored in the storage tank 2. Can be suppressed as much as possible.

  FIG. 17 is a main part configuration diagram of a system according to a twelfth embodiment of the present invention. In the eleventh embodiment, the bubble crushing member 27 is provided on the disk surface of the disk member 9. However, in the present embodiment, the air bubble crushing member 27 is erected on the inner side of the ceiling in the sealed container 8. Even with the configuration of the present embodiment, the same effects as those of the eleventh embodiment can be obtained.

  In addition, in this invention, the structure which combined 11th Embodiment and 12th Embodiment, ie, the structure which provides the bubble crushing member 27 in both the upper surface of the disk member 9, and the ceiling part inside sealed container 8, and Of course, it is also possible. According to this, it is possible to obtain a more remarkable bubble crushing effect.

1 is an overall configuration diagram of a system according to a first embodiment of the present invention. It is explanatory drawing which shows the structure of the disk member 9 and the airtight container 8 in FIG. 1, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is a BB arrow line view of (a). The characteristic view which shows the relationship between the change of a peripheral velocity, and the bubble generation average diameter about several bubble injection hole from which a hole diameter differs. The characteristic view which shows the relationship between the change of the peripheral velocity when a different gas flow rate is supplied with respect to the disk member which has a bubble injection hole of a specific hole diameter, and the bubble generation average diameter. The characteristic view which shows the relationship between the change of the peripheral velocity when a different gas flow rate is supplied with respect to the disk member which has only a specific number of bubble injection holes of a specific hole diameter, and the bubble generation average diameter. The characteristic view which shows the relationship between the change of a bubble injection hole pitch when a disk member which has a some bubble injection hole is rotated at a certain rotational speed, and the bubble generation average diameter. The principal part block diagram of the system which concerns on the 2nd Embodiment of this invention. The principal part block diagram of the system which concerns on the 3rd Embodiment of this invention. It is a principal part block diagram of the system which concerns on the 4th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is a BB arrow line view of (a). It is a principal part block diagram of the system which concerns on the 5th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is a BB arrow line view of (a). The principal part block diagram of the system which concerns on the 6th Embodiment of this invention. The principal part block diagram of the system which concerns on the 7th Embodiment of this invention. The principal part block diagram of the system which concerns on the 8th Embodiment of this invention. The principal part block diagram of the system which concerns on the 9th Embodiment of this invention. The principal part block diagram of the system which concerns on the 10th Embodiment of this invention. It is a principal part block diagram of the system which concerns on the 11th Embodiment of this invention, (a) is a longitudinal cross-sectional view of the disk member 9 and the airtight container 8, (b) is a BB arrow line view of (a). The principal part block diagram of the system which concerns on the 12th Embodiment of this invention.

Explanation of symbols

1: Liquid 2: Storage tank 3: Introduction line 4: Microbubble generator 5: Microbubble 6: Return line 7: Return pump 8, 8A: Sealed container 8a: Inlet 8b: Discharge port 8c: Coarse bubble reservoir 9: Disk member 9a: Cavity 9b: Bubble injection hole 10: Rotating shaft 10a: Air supply pipe 11: Drive motor 12: Rotary joint 13: Gas supply line 14: Blower (gas supply means)
15, 16: Rotary blade member 17: Coarse bubble 18: Air trap (Coarse bubble discharging means)
19: Coarse bubble discharge line 20: Check valve 21: Valve (Coarse bubble discharge means)
22: Coarse bubble detector 23: Valve control circuit 24: Air pump (Coarse bubble discharge means)
25: Pump control circuit 26: Ultrasonic generator 27: Bubble crushing member

Claims (2)

A storage tank in which a liquid to be injected with microbubbles is stored;
A microbubble generator for injecting microbubbles into the liquid introduced from the storage tank via the introduction line, and returning the liquid after microbubble injection to the storage tank via the return line;
A gas supply means for supplying a gas for generating microbubbles to the microbubble generator via a gas supply line;
With
The microbubble generator is
A sealed container connected to the introduction line and the return line;
A disk member that is disposed inside the sealed container and has a hollow portion for introducing gas from the gas supply means formed therein, and a plurality of bubble injection holes formed on the disk surface;
Motor means disposed outside the hermetic container and rotationally driving the disk member;
Have
The pitch interval of a large number of bubble injection holes formed on the disk surface of the disk member is a predetermined length or more,
The introduction port and the discharge port of the closed container connected to the introduction line and the return line are formed so that the introduction direction and the discharge direction are directions that generate a swirling flow in the direction of rotating the disk member. ,
A system for injecting microbubbles into a liquid. The sealed container has a substantially trumpet-shaped cylindrical shape in which the diameter on the ceiling side is larger than the diameter on the bottom side, the introduction port is formed on a side surface near the ceiling, and the discharge port is a side surface near the bottom. Formed in the
The system for injecting microbubbles into a liquid according to claim 1 .

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