JP5081801B2 - Gas-liquid dissolution tank in microbubble generator - Google Patents

Description

  The present invention is used for a fine bubble generating apparatus in which a gas is pressurized and dissolved in a liquid flowing in a pipeline and then fine bubbles are ejected into the liquid in the liquid tank to disperse and contain the fine bubbles. The present invention relates to a gas-liquid dissolution tank in which a gas is dissolved under pressure in a liquid.

  Conventionally, after the liquid in the liquid tank is circulated outside and the gas is pressurized and dissolved in the liquid, the fine bubbles are jetted into the liquid in the liquid tank again by reducing the pressure with the fine bubble generating nozzle in the liquid tank. There are known microbubble generators that disperse microbubbles into a liquid. The fine bubble generating device includes a flow path through which a liquid flows, an air suction port that mixes air with the liquid flowing through the flow path to form a gas-liquid mixed liquid, and a pump that pressurizes the gas-liquid mixed liquid and flows it into the flow path And a gas-liquid dissolution tank for supplying the gas-liquid mixed liquid to dissolve the gas in the liquid to make the gas-liquid dissolved liquid, and generating the fine bubbles by reducing the pressure of the obtained gas-liquid dissolved liquid, It is comprised from the fine bubble generation nozzle for making the liquid in a tank contain a fine bubble. Here, in order for the liquid containing fine bubbles to exert its effect, it is necessary to generate and contain a large amount of fine bubbles. This is related to the gas-liquid dissolution tank and the fine bubble generating nozzle. In many cases, the amount of gas dissolved in the gas-liquid dissolving liquid is an important factor, that is, the efficiency of dissolving the gas in the gas-liquid dissolving tank is important.

  As the gas-liquid dissolving means, a high-pressure pump is used as a pump for pressure-feeding the gas-liquid mixed liquid to dissolve the gas in the liquid under high pressure, and the undissolved surplus gas is removed inside the gas-liquid dissolving tank. Separate the gas-liquid dissolved liquid to the fine bubble generation nozzle side, or use a low-pressure pump to pump the gas-liquid mixed liquid under pressure to dissolve the gas in the liquid under low pressure. There is a means for dissolving the gas in the liquid and feeding it to the fine bubble generating nozzle side by spraying the liquid surface in the liquid dissolution tank from above the gas-liquid dissolution tank.

  By the way, in the above conventional gas-liquid dissolving means, the means for dissolving the gas in the liquid by increasing the pressure has to use a high-pressure pump for the pump, so that the pump itself becomes large. In addition, since it is used under high pressure, it is necessary to manufacture the gas-liquid dissolution tank with a high-strength material. For this reason, there is a problem that the microbubble generator is large in size and high in cost.

  Further, there is a means for dissolving the gas in the liquid by using a low-pressure pump and injecting the gas-liquid mixed liquid onto the liquid surface in the gas-liquid dissolution tank from above the gas-liquid dissolution tank. However, with this means, in order to increase the dissolution efficiency under low pressure, it is necessary to increase the contact area of the gas in the gas-liquid mixed liquid with the liquid. For this purpose, the gas-liquid mixed liquid must be sprayed to a region below the liquid level in the gas-liquid dissolution tank. For this purpose, the height dimension of the gas-liquid dissolution tank itself is required. Therefore, the gas-liquid dissolution tank itself becomes large, and as a result, it becomes large as a fine bubble generator. Therefore, in order to install these devices, there is a problem that the location is restricted.

  On the other hand, as a conventional technique, a gas-liquid dissolution tank has been proposed for generating a gas-liquid dissolution liquid by radially expanding and blowing liquid from a spray nozzle installed above the liquid in a bubbling tank (for example, a patent) Reference 1). However, this cannot necessarily be universalized as an apparatus that efficiently generates a gas-liquid solution without taking up space.

  Further, as the invention of the prior application by the present applicant, a gas-liquid dissolution tank comprising two components, a gas-liquid dissolution tank and a cap, which can improve the dissolution efficiency of a gas into a liquid even at a low pressure has been proposed. (For example, refer to Patent Document 2). Furthermore, in the invention (refer to Patent Document 3) which is another prior application by the present applicant, as shown in FIG. 7, when the fine bubble generator A is installed at a place higher than the liquid level in the liquid tank 1, The microbubble generator A itself must be self-priming. For this reason, it is necessary to set it as the internal structure of the microbubble generator A as shown in FIG. At that time, since it is necessary to store a certain liquid in the gas-liquid dissolution tank 8 in advance for self-priming, the cap 12 of the gas-liquid dissolution tank 8 is formed with removable parts, and the cap 12 is removed. Thus, liquid can be introduced from the upper part of the gas-liquid dissolution tank 8. At that time, when the fine bubble generating device A is operated due to forgetting to tighten the removed cap 12, the fluid scatters and the influence on the outside of the gas-liquid dissolution tank 8 becomes great, which may be dangerous.

Japanese Patent Laid-Open No. 2005-95878 Japanese Patent Application No. 2007-286746 Japanese Patent Application No. 2007-291001

  The present invention has been generalized by solving the problems in the above-described conventional high-pressure pumps and those using low-pressure pumps, and at low cost while reducing the size of the gas-liquid dissolution tank. An object of the present invention is to provide a gas-liquid dissolution tank capable of improving the dissolution efficiency of a gas into a liquid even at a low pressure and further improving safety.

  The means of the present invention for solving the above-described problems includes a tank body 11, an injection port 14 provided outside the tank body 11, and an injection port 16 a directed upward inside the tank body 11. Another component fitted to the upper end portion of the tank body 11 having the nozzle 16, the discharge port 19 projecting outward from the liquid level 17 inside the tank body 11, and the collision portion 20 disposed opposite to the injection port 16a. The gas-liquid dissolution tank 8 in the fine bubble generating apparatus A is characterized by being formed of an inner cap 22 and an outer cap 23 made of a separate part fitted to the upper end of the inner cap 22.

  In the present invention, the gas-liquid mixed liquid is jetted to the upper collision part from the injection port toward the upper side inside the gas-liquid dissolution tank and collided with the above means. Is filled in the upper part of the gas-liquid dissolution tank, and the filled high-pressure gas is easily dissolved in the liquid, so that the efficiency of dissolution in the liquid is improved. Furthermore, since the liquid ejected from the injection port is a structure that rebounds by the collision part above the inside of the tank body, it becomes a scattered state, so the area when landing on the liquid surface in the tank body increases, That is, by increasing the contact area of the gas with the liquid, the dissolution efficiency in the liquid is improved. In addition, since the upper part of the tank body has a cap formed as a separate part, it is possible to increase the area where the liquid ejected from the injection port collides and efficiently create a local high-pressure part. Since the production of caps with various indentations on the bottom surface can be made separately from the production of the tank body, the cost can be reduced, and the cap can be removed and replaced or repaired, so maintenance is also possible It can be improved. Furthermore, by forming the cap from two parts, fixing one cap with a screw, etc., and making the other cap removable, the jet of fluid from the injection port due to forgetting to tighten the cap to the outside of the gas-liquid dissolution tank Can be suppressed and safety can be improved.

  As described above, it is possible to obtain a gas-liquid dissolution tank capable of improving the efficiency of dissolving a gas into a liquid even at a low pressure while reducing the size of the gas-liquid dissolution tank. Furthermore, the use of the gas-liquid dissolution tank of the present invention makes it possible to miniaturize the pump of the microbubble generator, so that the microbubble generator itself can be reduced in size and weight, the restrictions on the installation location can be reduced, and the cost can be reduced. However, the means of the present invention, such as lowering the cost and improving the safety, exhibit excellent effects that have not been achieved in the past.

  The best mode for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

  In the accompanying drawings, FIG. 1 is a schematic circuit diagram of a fine bubble generator A having a gas-liquid dissolution tank 8 of the present invention. FIG. 2 is a schematic cross-sectional view illustrating the structure of the gas-liquid dissolution tank 8 in the first embodiment of the present invention. 3A and 3B are schematic views illustrating the structure of the inner cap 22 according to the first embodiment of the present invention. FIG. 3A is a side view showing the cross section, and FIG. 3B is a bottom view. 4A and 4B are schematic views for explaining the structure of the outer cap 23 according to the first embodiment of the present invention. FIG. 4A is a side view showing the cross section, and FIG. 4B is a bottom view. FIG. 5 is a schematic cross-sectional view of a gas-liquid dissolution tank 8 according to an embodiment of a conventional invention by the present applicant. 6A and 6B are schematic views for explaining the structure of the inner cap according to the conventional embodiment of the present applicant. FIG. 6A is a side view showing the cross section, and FIG. 6B is a bottom view. FIG. 7 is a schematic circuit diagram of a microbubble generator having self-priming performance in an embodiment of the invention of the prior application by the present applicant.

  An example embodied as an embodiment of the fine bubble generating nozzle 3 of the present invention will be described based on an example applied as the fine bubble generating device A for the liquid tank 1 shown in FIG. As shown in FIG. 1, a fine bubble generating nozzle 3 is installed in the liquid in the liquid tank 1. Similarly, a pump 5 is connected to the suction port 2 installed in the liquid via a suction line 4 outside the liquid tank 1. A gas introduction pipe 7 having a gas suction port 6 for sucking gas in an atmosphere such as air is disposed in the suction pipe 4 on the suction port side of the pump 5. A gas-liquid dissolution tank 8 for dissolving the gas sucked from the gas suction port 6 into a liquid is disposed on the downstream side of the pump 5. The pump 5 and the gas-liquid dissolution tank 8 communicate with each other by an inflow conduit 9. The liquid is circulated to the fine bubble generating nozzle 3 installed in the liquid in the liquid tank 1 by the discharge pipe 10 on the downstream side of the gas-liquid dissolution tank 8 to form the fine bubble generating device A.

  Here, when the power of the pump 5 is turned on, the liquid in the liquid tank 1 is sucked into the pump 5 from the suction port 2 through the suction pipe 4. At that time, the gas installed in the middle of the suction pipe 4 Since the gas is sucked from the gas suction port 6 of the introduction pipe 7, the liquid sucked into the pump 5 is in a gas-liquid mixed state. At this time, since the gas introduction pipe 7 is composed of an ejector mechanism, it is naturally aspirated without requiring any special power. Furthermore, the liquid in the gas-liquid mixed state is pressurized by the pump 5 and sent to the gas-liquid dissolution tank 8 through the inflow conduit 9. The liquid in the gas-liquid mixed state is pressurized and dissolved in the gas-liquid dissolution tank 8 to become a gas-liquid dissolved state, and is sent to the fine bubble generating nozzle 3 through the discharge pipe 10. By the way, in order to generate many fine bubbles in the fine bubble generating nozzle 3, the amount of gas dissolved in the gas-liquid dissolving liquid is involved. That is, the dissolution efficiency of gas in the gas-liquid dissolution tank 8 is important. In order to improve the dissolution efficiency of the gas in the liquid, it is necessary to create a high-pressure state in the gas-liquid dissolution tank 8 or increase the contact area of the gas with the liquid.

  Before describing the embodiment of the gas-liquid dissolution tank 8 of the means of the present invention, first, the gas-liquid dissolution tank 8 of the embodiment of the invention of the prior application by the applicant shown in FIG. 5 will be described. The gas-liquid dissolution tank 8 of the invention of the prior application is composed of a tank body 11 and a cap 12 made of a separate member screwed to the tank body 11, and the lower surface of the cap 12 is a ceiling portion 11 b which is the upper end of the tank body 12. Is forming. Further, as shown in FIG. 6, a plurality of annular ribs 18 having a downward concavo-convex shape are formed downward on the inner surface of the cap 12 having the upper portion in the tank body 11 as the collision portion 20. The plurality of downwardly formed annular ribs 18 have a low height at the center, and gradually increase toward the periphery and extend downward to form an inclined uneven bottom surface. The cap 12 is screwed into the tank body 11 and sealed with an O-ring 13. In FIG. 5, the suction port 14 for connecting to the inflow conduit 9 described in FIG. 1 is provided outside the gas-liquid dissolution tank 8, and the jet nozzle 16 extending from the suction port 14 has a gas-liquid dissolution. A pipe is provided from the side wall 11c of the tank 8 into the dissolution tank. The jet outlet 16a of the jet nozzle 16 in the dissolution tank 8 is directed upward. In this case, the injection port 16 a is disposed at a position higher than the liquid level in the gas-liquid dissolution tank 8. Further, the area of the injection port 16 a is formed smaller than the area of the suction port 14. The liquid ejected from the ejection port 16a collides with the collision part 20 on the lower surface of the cap 12, spreads around, and is ejected downward.

  In the embodiment of the invention of the prior application by the present applicant, the gas-liquid mixed liquid sent from the pump 5 shown in FIG. 1 is sucked into the jet nozzle 16 extending into the tank body 11 from the suction port 14 shown in FIG. The The ejection nozzle 16 in the tank body 11 has a tapered hole 15 having a narrowed tip shape, and is ejected vigorously through the taper hole 15 from the ejection port 16a upward in the tank body 11. The liquid ejected from the ejection port 16a bounces off the lower surface of the cap 12 which is the collision part 20, falls in the lower liquid surface 17 in a scattered state, and reaches the water. Since the inside of the tank main body 11 is in a pressurized state due to liquid feeding by the pump 5 shown in FIG. 1, the gas in the gas-liquid mixed liquid is filled in the upper part of the tank main body 11. For this reason, gas will melt | dissolve in a liquid in the process which falls from said ejection and lands. In addition, a local high-pressure portion is easily created by causing the gas-liquid mixed liquid to collide with the lower surface of the cap 12. In this high-pressure portion, the gas is easily dissolved in the liquid, so that the efficiency of dissolving the gas in the liquid is improved. In order to further increase the dissolution efficiency, it is necessary to increase the contact area of the gas with the liquid. As shown in FIG. 6, there are a plurality of annular ribs 18 formed downward on the inner surface of the cap 12, and the height of each of the ribs 18 is inclined so that the central portion is lowered and the height is gradually increased toward the periphery. Therefore, a collision occurs between the ejected gas-liquid mixed liquid and each rib 18 from the central portion to the periphery, and a local high-pressure portion can be formed in each rib 18, so that the gas liquid The dissolution efficiency in is further improved. Further, by forming the plurality of downward annular ribs 18 on the inner surface of the cap 12, the collision area is controlled and the size of the liquid surface 17 is increased, and the scattering state can be expanded. Thus, since the area when landing on the liquid surface 17 in the tank body 11 is uniformly expanded, the contact area between the gas and the liquid is increased. Also in this respect, the dissolution efficiency of the gas in the liquid is improved.

  Here, when undissolved large bubbles are sent from the discharge port 19 formed in the bottom 11 a of the tank body 11 to the fine bubble generating nozzle 3 shown in FIG. 1, the fine bubble generating nozzle 3 generates fine bubbles. It becomes difficult. Furthermore, noise generated when the gas-liquid dissolved liquid passes through the discharge port 19 is increased. Therefore, in the conventional apparatus, it is necessary to provide the discharge port 19 in a deep place so that undissolved large bubbles do not reach and be discharged. Therefore, it has been necessary to make the tank body 11 large in size with a large depth to the bottom 11a. Contrary to this, the tank body 11 of the invention of the prior application by the present applicant has a structure in which the liquid ejected from the ejection port 16a rebounds on the lower surface of the cap 12, and reaches the liquid surface 17 in the tank body 11. The area of the liquid surface 17 is enlarged as described above, and the injection pressure that reaches the liquid surface 17 is suppressed, so that undissolved large bubbles flow to the bottom portion 11 a of the lower portion of the tank body 11. It can be suppressed. As a result, since the depth below the liquid surface 17 of the tank body 11 of the gas-liquid dissolution tank 8 can be reduced and shallow, the gas-liquid dissolution tank 8 can be reduced in size. The gas-liquid dissolution liquid generated in the gas-liquid dissolution tank 8 is fed from the discharge port 19 to the fine bubble generation nozzle 3 shown in FIG. 1, and the fine bubble generation nozzle 3 adds fine bubbles to the liquid in the liquid tank 1. Is generated.

  Next, the gas-liquid dissolution tank 8 according to the first embodiment of the present invention will be described. In the gas-liquid dissolution tank 8 of the present invention, as shown in FIG. 2, an inner cap 22 having a collision portion 20 on the lower surface, and an outer cap 23 made of a separate part fitted to the upper end portion of the inner cap 22, It is composed of The outer cap 23 is screwed into the inner cap 22 and sealed with a packing 24. The lower surface of the inner cap 22 is formed with a plurality of annular ribs 18 having a downward concavo-convex shape downward, similarly to the lower surface of the cap 12 of the prior invention shown in FIG. Further, as in FIG. 5, the suction port 14 for connecting to the inflow conduit 9 described in FIG. 1 is provided outside the gas-liquid dissolution tank 8, and the ejection nozzle 16 extending from the suction port 14 is provided. A jet port 16 a is piped from the side wall 11 c of the gas-liquid dissolution tank 8 into the dissolution tank. The ejection nozzle 16 has a tapered hole 15 having a tapered shape, and is ejected from the ejection port 16 a of the ejection nozzle 16 directed upward through the taper hole 15 to the upper side in the tank body 11. Further, the injection port 16 a is disposed at a position higher than the liquid level in the gas-liquid dissolution tank 8. Further, the area of the injection port 16 a is formed smaller than the area of the suction port 14. The liquid ejected from the ejection port 16a collides with the collision part 20 on the lower surface of the inner cap 22 shown in FIG. 3, spreads around, and is ejected downward.

  By the way, since the inside of the tank main body 11 shown in FIG. 2 is in a pressurized state due to liquid feeding by the pump 5 shown in FIG. 1, the gas in the gas-liquid mixed liquid is filled in the upper part of the tank main body 11. For this reason, gas will melt | dissolve in a liquid in the process which falls from said ejection and lands. Further, a local high-pressure portion is easily created by causing the gas-liquid mixed liquid to collide with the lower surface of the inner cap 22. In this high-pressure portion, the gas is easily dissolved in the liquid, so that the efficiency of dissolving the gas in the liquid is improved. In order to further increase the dissolution efficiency, it is necessary to increase the contact area of the gas with the liquid. As shown in FIG. 3, there are a plurality of annular ribs 18 formed downward on the inner surface of the inner cap 22, and the height of each of the ribs 18 is inclined so that the central portion is lowered and gradually increased toward the peripheral edge. Provided. Therefore, a collision occurs between the jetted gas-liquid mixed liquid and each rib 18 from the central portion to the peripheral edge, so that a local high-pressure portion can be formed on each rib 18 and the gas is dissolved in the liquid. Efficiency is further improved. Further, by forming a plurality of downward annular ribs 18 on the inner surface of the inner cap 22, the collision area is controlled and the size of the liquid surface 17 in the tank body 11 is increased, and the scattering state can be expanded. It is. Thus, since the area when landing on the liquid surface 17 in the tank body 11 is uniformly expanded, the contact area between the gas and the liquid is increased. Also in this respect, the dissolution efficiency of the gas in the liquid is improved.

  By the way, in the invention of the prior application by the present applicant, as shown in FIG. 7, when the microbubble generator A is self-priming, the gas-liquid dissolution tank 8 can be used together as a self-priming storage tank. is there. In this case, in the fine bubble generator A provided with the gas-liquid dissolution tank 8 that mixes the gas with the liquid on the discharge side of the pump 5 that sucks the fluid from the liquid tank 1 through the suction pipe 25, the pump 5 is a non-self-priming type. The outlet pipe 27 of the gas-liquid dissolution tank 8 and the fine bubble generating nozzle 3 are connected to the suction pipe 25 or the pump 5 from the discharge port 19 of the gas-liquid dissolution tank 8 which is the rear path of the gas-liquid dissolution tank 8 or the gas-liquid dissolution tank 8. A communication passage 28 communicating with the impeller chamber is provided to allow the liquid in the gas-liquid dissolution tank 8 to return to the impeller chamber of the pump 5 and to have a self-priming function for the entire fine bubble generator A. . At the time of self-priming, the valve 29 such as an electromagnetic valve is controlled so that the gas introduction pipe 7 does not introduce gas from the gas suction port 6. On the other hand, when self-priming is not necessary after completion of self-priming, the check valve 6a of the gas inlet 7 of the gas introduction pipe 7 is opened, and the communication passage 28 communicating with the pump 5 impeller interior is provided with an electromagnetic valve or the like. The valve 30 is closed to prevent the liquid in the gas-liquid dissolution tank 8 from returning to the pump 5.

  By the way, in the case of the self-priming type, in order to inject the self-priming water into the gas-liquid dissolution tank 8, the gas-liquid of the embodiment of the invention of the prior application by the applicant shown in FIG. When the dissolution tank 8 is used, the cap 12 is removed. When the cap 12 is removed in this way, it may be possible to forget to close the cap 12 after injecting self-priming water. However, when the apparatus is operated without forgetting to close the cap 12, in the gas-liquid dissolution tank 8 of FIG. 5, the fluid ejected from the ejection port 16 a of the ejection nozzle 16 is ejected from the upper part of the gas-liquid dissolution tank 8 to the outside. As a result, there is a risk of scattering outside the gas-liquid dissolution tank 8.

  Therefore, in the gas-liquid dissolution tank 8 of the embodiment of the present invention, as shown in FIGS. 2 and 3, the cap is formed from separate parts of the inner cap 22 and the outer cap 23. In this case, the inner cap 22 is fixed to the tank body 11 with a screw, and the outer cap 23 is removably screwed to the inner cap 22, and the inner cap 22 is provided with a packing 24 provided at the cylindrical upper end of the inner cap 22. The upper end of the cap 22 is sealed with the external cap 23. Further, the collision portion 20 on the lower surface of the central portion of the inner cap 22 facing the ejection port 16a of the injection nozzle 16 is integrated with the annular side portion of the inner cap 22 by a plurality of bridges 22a having gaps 22b. . Therefore, when the self-priming water is injected into the gas-liquid dissolution tank 8, the external cap 23 can be removed.

  By the way, even after the external cap 23 is removed and the self-priming water is injected, even if the external cap 23 is forgotten to be closed and the fine bubble generator is operated, the collision portion 20 is held by the bridge 22a and the jet nozzle 16a of the jet nozzle 16 is operated. Therefore, the liquid ejected from the ejection port 16a collides with the collision unit 20. Therefore, the liquid is prevented from scattering outside the gas-liquid dissolution tank 8, and safety can be improved. 3A is a longitudinal sectional view of the inner cap 22, and FIG. 3B is a plan view seen from the bottom surface. 4A is a longitudinal sectional view of the outer cap 23 from which the packing 24 is removed, and FIG. 4B is a plan view seen from the lower surface thereof.

  In the present invention, the gas-liquid dissolution tank 8 has the structure of the above-described embodiment, so that the tank body 11 can be reduced in size while improving the efficiency of dissolving gas into a liquid at low cost and even at low pressure. The gas-liquid dissolution tank 8 which can improve the property and can be a self-priming type is obtained.

1 is a schematic circuit diagram of a fine bubble generator according to an embodiment of the present invention. It is typical sectional drawing explaining the structure of the gas-liquid dissolution tank in the 1st Embodiment of this invention. It is a schematic diagram explaining the structure of the inner cap in the 1st Embodiment of this invention, (a) is a side view shown in a cross section, (b) is a bottom view. It is a schematic diagram explaining the structure of the external cap in the 1st Embodiment of this invention, (a) is a side view shown in a cross section, (b) is a bottom view. It is typical sectional drawing of the gas-liquid dissolution tank 8 in embodiment of invention of the prior application by this applicant. It is a schematic diagram explaining the structure of the internal cap in embodiment of invention of the prior application by this applicant, (a) is a side view shown in a cross section, (b) is a bottom view. 1 is a schematic circuit diagram of a fine bubble generator having self-priming performance in an embodiment of the invention of the prior application by the present applicant.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid tank 2 Suction port 3 Fine bubble generation nozzle 4 Suction line 5 Pump 6 Gas suction port 6a Check valve 7 Gas introduction pipe 8 Gas-liquid dissolution tank 9 Inflow line 10 Discharge line 11 Tank body 11a Bottom part 11b Ceiling part 11c Side wall 12 Cap 13 O-ring 14 Suction port 15 Taper hole 16 Injection nozzle 16a Injection port 17 Liquid level 18 Rib 19 Discharge port 20 Collision part 22 Internal cap 22a Bridge 22b Gap 23 External cap 24 Packing 25 Suction pipe 26 Pump discharge piping 27 Outlet pipe 28 Communication path 29 Valve 30 Valve A Fine bubble generator

Claims (1)

  Below the tank body 11, an injection nozzle 16 having a suction port 14 outside the tank body 11 and having an injection port 16 a facing upward inside the tank body 11, and below the liquid level 17 inside the tank body 11. An inner cap 22 made of a separate part fitted to the upper end of the tank body 11 having a discharge port 19 projecting outside and a collision portion 20 disposed opposite to the injection port 16a, and fitted to the upper end of the inner cap 22 The gas-liquid dissolution tank 8 in the fine bubble generating apparatus A is characterized by being formed from an external cap 23 made of a separate component.

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