JP4408661B2 - Microbubble generator - Google Patents

Description

  The present invention relates to a fine bubble generating device having a function of supplying a liquid mixed with fine bubbles into water in a state where it is immersed in water or other liquid.

  It has been conventionally known that various effects are produced by increasing the amount of dissolved oxygen by sending bubbles into water, and it has been applied in various industrial fields such as plant cultivation, seafood culture, and wastewater treatment. In this case, in order to dissolve a large amount of gas such as bubbled oxygen in water, it is effective to reduce the bubble diameter as much as possible to increase the surface area of the entire bubble and increase the gas-liquid contact area. ing.

  Therefore, as a device that has the function of supplying bubbles into liquids such as water, a pump that sucks and discharges liquid and a bubble generator that generates bubbles in the liquid sucked by the pump are connected together. A microbubble generator having the above structure has been developed (see, for example, Patent Documents 1 and 2).

JP-A-5-240154 (page 3-6) JP-A-6-299984 (page 2-4)

  In the case of the submersible pump with a bubble nozzle described in Patent Document 1, it does not operate unless an external force is applied to the connecting rod protruding from the water surface to raise and lower it, so a power source such as a water turbine, an electric motor or an engine is required. In addition, since the connecting rod cannot be operated unless it protrudes from the surface of the water, it is not suitable for use in a deep water position. Further, since the bubble generation state periodically varies due to the operation by the reciprocating movement of the piston, it is difficult to stably supply the bubbles.

  In the case of the liquid pump described in Patent Document 2, since an electric motor is provided in addition to the bubble generator and the pump, a large amount of bubbles are supplied into the liquid by being put into the liquid and operating the electric motor. I can. However, since bubbles are generated by stirring liquid with an impeller rotated by an electric motor, fine bubbles cannot be generated.

  The problem to be solved by the present invention is to provide a microbubble generator that can be moved freely, is easy to use, and can stably supply a large amount of microbubbles into a liquid.

The fine bubble generating apparatus of the present invention includes a cylindrical gas-liquid swirl chamber in which gas-liquid can swivel around an axis, and a gas-liquid swirl flow by introducing liquid into the gas-liquid swirl chamber. A liquid introduction path for ejecting liquid in a direction that forms a twist position with respect to the axis of the gas-liquid swirl chamber, and a gas swirl chamber that opens to the outside to introduce gas into the gas swirl chamber. A fine bubble generator comprising a gas introduction path formed in communication and a gas-liquid discharge port formed at an end of the gas-liquid swirl chamber in the axial direction;
A liquid-proof pump that supplies the liquid sucked from a suction port provided in a portion that can be immersed in the liquid to the liquid introduction path;
And a liquid-proof electric motor for operating the pump ,
The liquid introduction path has a cylindrical shape, and a connection part with a water discharge part of the pump is provided at a base end thereof, and a distal end of the liquid introduction path is opposite to a gas liquid discharge port of the gas liquid swirl chamber. An end of the gas-liquid swirl chamber is disposed so as to protrude into the gas-liquid swirl chamber, and the distal end portion is closed by a closing plate, and an axis of the gas-liquid swirl chamber is disposed on the outer periphery of the liquid introduction path located in the gas-liquid swirl chamber. A plurality of jet outlets are provided for jetting liquid in the direction of twisting with the center, and a portion wider than the inner diameter of the connecting portion on the base end side is provided inside the tip end side of the liquid introduction path,
The gas introduction path penetrates through the side surface of the liquid introduction path and enters the inside thereof, and after bending in the axial direction, the tip opening of the shaft on the gas-liquid swirl chamber side of the closing plate It is characterized by opening on the heart . Here, the liquid-proof property means a property that the original function is not inhibited even when immersed in water or other liquids.

  When the microbubble generator according to the present invention is put into a liquid and the electric motor is operated in the immersed state, the liquid sucked from the suction port is ejected into the gas-liquid swirl chamber via the liquid introduction path. However, since the direction of jetting is the direction of twisting with the axis of the gas-liquid swirl chamber, a swirl flow around the axis is generated in the gas-liquid swirl chamber, and part of the swirl flow is gas-liquid The liquid is discharged from the discharge port. At this time, a negative pressure cavity is generated in the vicinity of the axial center in the gas-liquid swirl chamber, and the gas-liquid swirl chamber becomes negative pressure due to the presence of this negative pressure cavity, so the gas introduction path communicating with the gas-liquid swirl chamber External gas is sucked from the opening of the gas and introduced into the gas-liquid swirl chamber via the gas introduction path.

  The gas introduced into the gas-liquid swirl chamber via the gas introduction path is refined by the shearing action of the swirl flow, and turns into a gas-liquid swirl flow and swirls in the gas-liquid swirl chamber, and eventually becomes fine from the gas-liquid discharge port. The liquid is mixed with bubbles and discharged to the outside (in the liquid). That is, the gas sucked from the outside can be made into fine bubbles and supplied into the liquid.

  As described above, the microbubble generator according to the present invention can be moved freely because the microbubble generator, the pump and the electric motor are integrated, and the electric motor is immersed in the liquid as a whole. Since the liquid containing fine bubbles can be supplied to the liquid simply by actuating the, it is easy to use. Moreover, since it can be continuously operated by the electric motor, a large amount of fine bubbles can be stably supplied into the liquid.

  Here, by providing the liquid jet outlet of the liquid introduction path at a position away from the inner peripheral surface of the gas-liquid swirl chamber, the negative pressure cavity is formed substantially linearly on the axis of the gas-liquid swirl chamber. Since the position and the stability of the shape are increased, the occurrence of cavitation erosion is prevented, and the durability of the fine bubble generator is improved.

  Further, if the opening of the gas introduction path is arranged on the axis of the gas-liquid swirl chamber, a large negative pressure generated in the negative pressure cavity generated near the axis due to the swirling flow in the gas-liquid swirl chamber is used. Thus, an external gas can be efficiently introduced into the gas-liquid swirl chamber to form fine bubbles.

  On the other hand, it is desirable to dispose a gas-liquid guiding member having a plane or curved surface intersecting the axial direction at a position facing the gas-liquid discharge port. If such a gas-liquid guiding member is arranged, the liquid containing fine bubbles discharged while turning from the gas-liquid discharging port is guided to spread along the plane or curved surface of the gas-liquid guiding member. Therefore, the diffusibility of fine bubbles is improved. As a result, the negative pressure level in the gas-liquid swirl chamber is increased and a large amount of gas is introduced into the gas-liquid swirl chamber, so that the amount of fine bubbles generated is also increased. In addition, the gas-liquid guide member prevents the liquid near the gas-liquid discharge port outside the fine bubble generator from being attracted to the gas-liquid discharge port by the negative pressure generated in the gas-liquid swirl chamber. Therefore, it is possible to prevent the reverse flow of the liquid into the gas-liquid swirl chamber.

  The gas-liquid discharge port may have a structure in which a gas-liquid guide tube protruding in the gas-liquid discharge direction from the gas-liquid discharge port is communicated with the gas-liquid discharge port. If such a gas-liquid guide tube is provided, the discharge direction of the liquid mixed with fine bubbles discharged from the gas-liquid discharge port is determined, the discharge amount is increased, the negative pressure level in the gas-liquid swirl chamber is increased, and a large amount of Since gas is introduced into the gas-liquid swirl chamber, the amount of fine bubbles generated also increases. Further, since the straightness of the liquid containing fine bubbles discharged from the gas-liquid discharge port is also improved, it is possible to supply fine bubbles to a more distant area, and the discharged gas-liquid mixture The stirring action on the liquid is also exhibited. Furthermore, the gas-liquid guide tube prevents the liquid near the gas-liquid discharge port outside the microbubble generator from being attracted to the gas-liquid discharge port by the negative pressure generated in the gas-liquid swirl chamber. Therefore, the reverse flow of the liquid into the gas-liquid swirl chamber can be prevented.

The present invention has the following effects.

(1) Cylindrical gas-liquid swirl chamber in which gas-liquid can swivel around the axis, and gas-liquid swirl for introducing liquid into the gas-liquid swirl chamber and generating a gas-liquid swirl flow in the gas-liquid swirl chamber A liquid introduction path that ejects liquid in a direction that forms a twist with the axial center of the chamber, and a gas introduction path that is open to the outside and communicates with the gas swirl chamber to introduce gas into the gas swirl chamber. , A fine bubble generator having a gas-liquid discharge port formed at the end of the gas-liquid swirl chamber in the axial direction, and the liquid sucked from the suction port provided in the part that can be immersed in the liquid A liquid-proof pump for supplying to the introduction path and a liquid-proof electric motor for operating the pump are integrally connected, and the liquid introduction path has a cylindrical shape. The end of the liquid introduction path is the end opposite to the gas-liquid discharge port of the gas-liquid swirl chamber. In the gas-liquid swirl chamber, the tip portion is closed by a closing plate, and the outer periphery of the liquid introduction path located in the gas-liquid swirl chamber has a position of the axis and twist of the gas-liquid swirl chamber. A plurality of jet nozzles for ejecting liquid in the direction to be formed are provided, a portion wider than the inner diameter of the coupling portion on the base end side is provided inside the distal end side of the liquid introduction path, and the gas introduction path is a side portion of the liquid introduction path It is possible to move freely because the front end opening opens on the gas-liquid swirl chamber side axis of the closing plate after entering the inside and bending in the axial direction. It is easy to use and can stably supply a large amount of fine bubbles into the liquid.

(2) Since the liquid outlet of the liquid introduction path is provided at a position away from the inner peripheral surface of the gas-liquid swirl chamber, the stability of the position and shape of the negative pressure cavity is increased, so that cavitation erosion occurs. Is prevented, and the durability of the fine bubble generator is improved.

(3) If the opening of the gas introduction path is arranged on the axial center of the gas-liquid swirl chamber, the external gas can be efficiently discharged by utilizing a large negative pressure generated in the negative pressure cavity in the gas-liquid swirl chamber. It can be introduced into the gas-liquid swirl chamber to make fine bubbles.

(4) If a gas-liquid guide member having a plane or a curved surface intersecting the axial direction is arranged at a position facing the gas-liquid discharge port, the diffusibility of fine bubbles discharged while turning from the gas-liquid discharge port The amount of fine bubbles generated can be increased by improving the negative pressure level, and the reverse flow of liquid into the gas-liquid swirl chamber can be prevented.

(5) When a gas-liquid guide tube protruding in the gas-liquid discharge direction from the gas-liquid discharge port is connected to the gas-liquid discharge port, the straightness of the liquid containing fine bubbles discharged from the gas-liquid discharge port In addition to improving the negative pressure level, fine bubbles can be supplied to more distant areas, and the amount of fine bubbles generated is increased by increasing the negative pressure level. It can also prevent entry.

  FIG. 1 is a side view showing a use state of a fine bubble generator according to a first embodiment of the present invention, FIG. 2 is a plan view of the fine bubble generator shown in FIG. 1, and FIG. 3 is a fine bubble generator shown in FIG. It is a partially notched side view which shows the fine bubble generator which comprises.

  As shown in FIG. 1 and FIG. 2, the fine bubble generator 1 of the present embodiment integrally includes a waterproof pump 2, a waterproof electric motor 3 that operates the pump 2, and a fine bubble generator 4. It has a connected structure. The electric motor 3 is connected to a power source (not shown) via a power cord 5 and can be turned on and off by a switch 6 provided in the middle of the power cord 5. The pump 2 is coaxially connected to a rotating shaft (not shown) of the electric motor 3, and supplies the water W sucked from the suction port 2 a to the liquid introduction path 15 of the fine bubble generator 4 through the water discharge unit 8.

  The microbubble generator 4 is generally cylindrical, and a lower end of the microbubble generator 4 is connected to a base end portion of an intake pipe 9 for introducing air in the atmosphere. The upper end portion of the intake pipe 9 is opened to the atmosphere via a pressure gauge 10, an on-off valve 11 and an air cleaner 12 arranged on the ground. A check valve 13 is provided in the middle of the intake pipe 9 to prevent the water W from flowing back to the ground.

  As shown in FIGS. 3 to 5, the fine bubble generator 4 includes a gas-liquid swirl chamber 14 provided in a cylindrical casing 4 a in which gas-liquid (water and air) can swirl around an axis S, and a gas-liquid swirl chamber 14. In order to introduce a liquid (water) into the liquid swirl chamber 14 to generate a gas-liquid swirl flow R, a liquid introduction path 15 having a function of ejecting the liquid (water) into the gas-liquid swirl chamber 14 and the gas swirl chamber 14 In order to introduce gas (air) into the inside, a gas introduction path 16 formed in communication with the gas swirl chamber 14 and opened to the outside, and a gas formed at the end of the gas-liquid swirl chamber 14 in the axial center S direction. And a liquid discharge port 17.

  The liquid introduction path 15 has a cylindrical shape, and is provided at its base end with a connecting portion 15c connected to the water discharge portion 8 of the pump 2, and its tip is the end opposite to the gas-liquid discharge port 17 of the gas-liquid swirl chamber 14. It is arrange | positioned so that it may protrude in the gas-liquid swirl chamber 14 in a part, and the front-end | tip part is obstruct | occluded with the obstruction | occlusion board 15a. As shown in FIG. 7, on the outer periphery of the liquid introduction path 15 located in the gas-liquid swirl chamber 14, a plurality of liquids for ejecting liquid in a direction that forms a twist position with the axis S of the gas-liquid swirl chamber 14. A spout 15b is provided. In the present embodiment, six jet outlets 15b are arranged at equiangular intervals around the axis S, and a total of 12 jet outlets 15b are arranged in two stages in the direction of the axis S with the same phase. Although the number is provided, it is not limited to these numbers.

  As shown in FIG. 4, the gas introduction path 16 penetrates the side surface portion of the liquid introduction path 15 and enters the inside thereof, bends in the direction of the axis S, and then the tip opening 16 a is the surface of the blocking plate 15 a. It opens to the side (gas-liquid swirl chamber 14 side). A base end portion of the intake pipe 9 is detachably connected to a gas introduction path 16 protruding from a side surface of the liquid introduction path 15.

  As shown in FIGS. 4 and 5, a plane that intersects the axis S at a position facing the gas-liquid discharge port 17 outside the gas-liquid discharge port 17 of the cylindrical casing 4 a containing the gas-liquid swirl chamber 14. A disk-shaped gas-liquid induction member 18 having 18a is arranged. The gas-liquid guide member 18 is joined to the tip end portion of the cylindrical casing 4a via three arc-shaped connecting members 18a and 18b, and three outlets formed between the connecting members 18a and 18b. From 19, a liquid (water) mixed with fine bubbles, which will be described later, is blown out into water. Note that these three outlets 19 are arranged at intervals of 90 degrees in three directions excluding the arrangement direction of the electric motor 3 in a plan view.

  As shown in FIG. 1, when the fine bubble generating device 1 of this embodiment is put into water W, placed in a standing state on the bottom Z, and the motor 3 is operated by operating the switch 6, The water W sucked from the suction port 2a flows into the liquid introduction path 15 from the water discharge part 8, and is ejected into the gas-liquid swirl chamber 14 through the jet port 15b. Since it is in the direction of twisting with the shaft center S, a swirling flow around the shaft center S is generated in the gas-liquid swirl chamber 14, and a part of this swirling flow is water from the gas-liquid discharge port 17. It is discharged into W.

  At this time, as shown in FIG. 4, a negative pressure cavity V is generated in the vicinity of the axis S in the gas-liquid swirl chamber 14, and the presence of this negative pressure cavity V causes the negative pressure in the gas-liquid swirl chamber 14. Therefore, gas (air in the atmosphere) is sucked through the gas introduction path 16 communicating with the gas-liquid swirl chamber 14 and the intake pipe 9, and the gas-liquid swirl chamber 14 is inserted from the tip opening 16 a of the gas introduction path 16. It is introduced in.

  The gas introduced into the gas-liquid swirl chamber 14 via the tip opening 16a of the gas introduction path 16 is refined by the shearing action of the swirl flow described above to become the gas-liquid swirl flow R, and the gas-liquid swirl chamber 14 While turning inside, it eventually becomes a liquid mixed with fine bubbles NB from the gas-liquid discharge port 17 and is discharged into the water W. That is, the air sucked from the atmosphere can be changed into the fine bubbles NB and supplied into the water W.

  The fine bubble generator 1 of this embodiment can be moved freely because the pump 2, the electric motor 3, and the fine bubble generator 4 are integrated, and the entire device 1 is immersed in the water W. Thus, since the liquid mixed with the fine bubbles NB can be supplied into the water W simply by operating the electric motor 3, the usage is easy. Moreover, since it can be operated continuously by the electric motor 3, a large amount of fine bubbles NB can be stably supplied into the water W.

  In the microbubble generator 1, since the liquid jet port 15b of the liquid introduction path 15 is provided at a position away from the inner peripheral surface 14a of the gas-liquid swirl chamber 14, the negative pressure cavity V is caused by the water jetted from the jet port 15b. No water pressure is applied to the. Therefore, the negative pressure cavity V is formed substantially linearly on the axis S of the gas-liquid swirl chamber 14, and the position and shape thereof are kept stable, so that cavitation erosion is prevented. The fine bubble generator 4 exhibits excellent durability.

  Further, since the front end opening 16 a of the gas introduction path 16 is disposed on the axis S of the gas-liquid swirl chamber 14, it is generated near the axis S by the gas-liquid swirl flow R in the gas-liquid swirl chamber 14. Using the large negative pressure generated in the negative pressure cavity V, air in the atmosphere can be efficiently introduced into the gas-liquid swirl chamber 14 to form the fine bubbles NB. Therefore, an air pump for introducing outside air into the gas-liquid swirl chamber 14 is unnecessary.

  On the other hand, since the gas-liquid guide member 18 having the flat surface 18a intersecting the direction of the axis S is disposed at a position facing the gas-liquid discharge port 17, the fine bubbles discharged while turning from the gas-liquid discharge port 17 After the NB-mixed liquid is guided to spread to the periphery along the plane 18a of the gas-liquid guide member 18, it can be directed from the three outlets 19 in three different directions, and the diffusibility of the fine bubbles NB. Is also good.

  In addition, the negative pressure level in the gas-liquid swirl chamber 14 is thereby increased, and a large amount of air is introduced into the gas-liquid swirl chamber 14, so that the generation amount of the fine bubbles NB is also increased. Further, the water W near the gas-liquid discharge port 17 outside the fine bubble generator 4 is attracted to the gas-liquid discharge port 17 by the negative pressure of the negative pressure cavity V generated in the gas-liquid swirl chamber 14. Is prevented by the gas-liquid guide member 18, so that the reverse flow of the water W into the gas-liquid swirl chamber 14 can be prevented.

  The use of the microbubble generator 1 of the present embodiment is not particularly limited, and can be widely used in various technical fields. For example, means for increasing the amount of dissolved oxygen in agricultural water, water-soluble fertilizer It can be suitably used as a dissolution and refinement means. Moreover, since the microbubble generator 1 is comparatively small, it is also suitable when used by putting it in a small-sized water tank or water tank.

  Next, with reference to FIGS. 8-14, the microbubble generator 21 which is 2nd Embodiment of this invention is demonstrated. 8 to 14, the portions denoted by the same reference numerals as those in FIGS. 1 to 9 are portions exhibiting the same functions and effects as those in the case of the fine bubble generating device 1 of the first embodiment. Omitted.

  As shown in FIGS. 8 and 9, the fine bubble generator has a structure in which the pump 2, the electric motor 3, and the fine bubble generator 24 are integrated. The fine bubble generator 24 is integrated with the pump 2 by connecting a liquid introduction path 25 provided on the bottom surface thereof to the water discharger 8 of the pump 2.

  As shown in FIGS. 10 to 12, the fine bubble generator 24 has a substantially rectangular parallelepiped shape, and two gas-liquid induction tubes 29 are arranged in a protruding manner on the front surface thereof. Two gas-liquid swirl chambers 24 a and 24 b having a substantially cylindrical shape are arranged inside the fine bubble generator 24. The liquid guide path 25 communicates with a rectangular parallelepiped liquid chamber 25c provided inside the fine bubble generator 24, and air is passed through two liquid channels 25a and 25b provided in the ceiling of the liquid chamber 25a. It communicates with the liquid swirl chambers 24a, 24b.

  At the base end portions (portions near the electric motor 3) of the gas-liquid swirl chambers 24a and 24b, the distal end opening portions 26a of the gas introduction passages 26 are respectively positioned, and the distal end portions (the electric motor 3) of the gas-liquid swirl chambers 24a and 24b. Gas-liquid discharge ports 27 are provided on the opposite sides of the gas-liquid discharge tube 27, and gas-liquid guide tubes 29 are arranged so as to communicate with the gas-liquid discharge ports 27, respectively.

  As shown in FIG. 8, when the fine bubble generating device 21 of this embodiment is poured into the water W, placed in a standing state on the bottom Z, and the motor 3 is operated by operating the switch 6, The water W sucked from the suction port 2a flows into the liquid introduction path 25 from the water discharge section 8, and is jetted into the gas-liquid swirl chambers 24a and 24b via the liquid chamber 25c and the liquid flow paths 25a and 25b, respectively. At this time, as shown in FIG. 13, the direction of water ejection from the liquid flow paths 25a and 25b is the direction of twisting with the axis S of the gas-liquid swirl chambers 24a and 24b. A swirl flow around the axis S is generated in each of the chambers 24a and 24b, and a part of the swirl flow is discharged from the gas-liquid discharge port 27 into the water W.

  Accordingly, a negative pressure cavity V is generated near the axis S in the gas-liquid swirl chambers 24a and 24b, and the presence of this negative pressure cavity V causes a negative pressure in the gas-liquid swirl chambers 24a and 24b. Gas (air in the atmosphere) is sucked through the gas introduction path 26 and the intake pipe 9 communicating with the gas-liquid swirl chambers 24a and 24b, and the gas-liquid swirl chambers 24a and 24b are introduced from the front end opening 26a of the gas introduction path 26. It is introduced in.

  The gas introduced into the gas-liquid swirl chambers 24a and 24b via the tip opening 16a of the gas introduction path 16 is refined by the above-described shearing action of the swirl flow to become a gas-liquid swirl flow R, and the gas-liquid swirl While turning in the chambers 24a and 24b, the liquid is eventually mixed into the water W from the gas-liquid discharge port 27 and mixed with the fine bubbles NB. That is, the air sucked from the atmosphere can be changed into the fine bubbles NB and supplied into the water W.

  In the microbubble generator 21, as shown in FIG. 14, the openings 25d and 25e of the liquid flow paths 25a and 25b are provided on the inner peripheral surfaces of the gas-liquid swirl chambers 24a and 24b. , 25e are provided with preliminary swirl chambers 24c, 24d each having an enlarged inner diameter of the gas-liquid swirl chambers 24a, 24b. For this reason, the negative pressure cavity V does not move due to the pressure of water ejected from the liquid flow paths 25a and 25b, the shape and position thereof are stable, cavitation erosion does not occur, and durability is improved. Are better.

  Further, since the gas-liquid discharge port 27 communicates with the gas-liquid guide tube 29 protruding in the gas-liquid discharge direction from the gas-liquid discharge port 27, the fine bubbles NB discharged from the gas-liquid discharge port 27 are mixed. The liquid discharge direction of the liquid is determined, the straightness is also improved, the fine bubbles NB can be supplied to a more distant area, and the discharged gas-liquid mixture also exhibits the action of stirring the surrounding water W . Further, by providing the gas-liquid guide tube 29, the liquid mixed with the fine bubbles NB is efficiently discharged. As a result, the negative pressure level in the discharge gas-liquid swirl chambers 24c and 24d is increased, and a large amount of air is introduced. Therefore, the generation amount of fine bubbles NB also increases.

  On the other hand, the water W near the gas-liquid discharge port 27 outside the fine bubble generator 24 is attracted to the gas-liquid discharge port 27 by the negative pressure of the negative pressure cavity V generated in the gas-liquid swirl chambers 24a, 24b. Since the gas-liquid guide tube 29 prevents this, the reverse flow of the water W into the gas-liquid swirl chambers 24a and 24b can be prevented.

  The application of the microbubble generator 21 of the present embodiment is not particularly limited, and can be widely used in various technical fields. For example, means for increasing the dissolved oxygen amount of agricultural water, dissolution of water-soluble fertilizer And it can be suitably used as a means for miniaturization. The fine bubble generator 24 constituting the fine bubble generator 21 includes two gas-liquid swirl chambers 24a and 24b, and jets water W mixed with the fine bubbles NB from the two gas-liquid guide tubes 29. The jet power is strong, the fine bubbles NB can be supplied to a distant place, and the stirring action is also excellent. For this reason, it can be suitably used in a water tank or water tank having a wide bottom Z. Other structures, functions, and effects are the same as those of the fine bubble generator 1 described above.

  Next, with reference to FIGS. 15-17, the microbubble generator 31 which is 3rd Embodiment of this invention is demonstrated. 15 to 17, the portions denoted by the same reference numerals as those in FIGS. 1 to 9 are portions exhibiting the same functions and effects as those in the case of the fine bubble generating device 1 of the first embodiment. Omitted.

  In the fine bubble generator 31 of this embodiment, a fine bubble generator 34 is attached instead of the fine bubble generator 4 of the fine bubble generator 1 of the first embodiment, and the structure of the other parts is fine. This is exactly the same as the bubble generator 1. The fine bubble generator 34 removes the gas-liquid guide member 18 and the connecting members 18 b and 18 c of the fine bubble generator 4 constituting the fine bubble generator 1, and connects the gas-liquid guide tube 39 to the gas-liquid discharge port 17. The structure of the other part is exactly the same as that of the fine bubble generator 4.

  As shown in FIG. 15, when the fine bubble generator 31 is poured into the water W, placed on the bottom Z in an upright manner, and the electric motor 3 is operated, the gas-liquid generated in the fine bubble generator 34. By the action of the swirl flow R and the negative pressure cavity V, the liquid mixed with the fine bubbles NB can be ejected from the gas-liquid guide tube 39 into the water W. The gas-liquid guide tube 39 exhibits the same function as the gas-liquid guide tube 29 of the fine bubble generating device 21, can supply the fine bubbles NB far, and can prevent reverse inflow of water W. Further, since the jet power of the liquid mixed with the fine bubbles NB ejected from the gas-liquid guide tube 39 is relatively large, if it is operated in the state of FIG. 15, a strong stirring action in the vertical direction is exhibited.

  On the other hand, as shown in FIG. 17, the fine bubble generating device 31 can be operated by placing it on the bottom Z in a state where the entire fine bubble generating device 31 is placed sideways. If so, the fine bubbles NB can be supplied to a far region in the horizontal direction, and a strong stirring action in the horizontal direction can be exhibited, so that a large circulating flow can be generated in the water W.

  The use of the microbubble generator 31 of the present embodiment is not particularly limited and can be widely used in various technical fields. However, when used in the state shown in FIG. 17, for example, aquaculture-related aquaculture It can be suitably used as a means for increasing the amount of dissolved oxygen and a means for dissolving and refining water-soluble fertilizer in a shallow and wide aquarium such as an aquarium or a storage tank. Other structures, functions, and effects are the same as those of the fine bubble generator 1 described above.

  Next, with reference to FIG. 18, the microbubble generator 41 which is 4th Embodiment of this invention is demonstrated. In FIG. 18, the same reference numerals as those in FIGS. 1 to 9 and FIGS. 15 to 17 show the same functions and effects as those of the fine bubble generators 1 and 31 of the first and third embodiments. Since it is a part to perform, description is abbreviate | omitted.

  In the fine bubble generator 41 of this embodiment, the fine bubble generator 34 of the fine bubble generator 31 of the third embodiment is attached to the water discharge part 8 of the pump 2 via an L-shaped connecting pipe 42. Yes, the structure of other parts is exactly the same as that of the microbubble generator 31.

  In the case of the fine bubble generating device 41, as shown in FIG. 18, if the electric motor 3 and the pump 2 are placed on the bottom Z in a standing state, the gas-liquid guide tube 39 faces in the horizontal direction. If 3 is operated, the same function and effect as the fine bubble generating device 31 shown in FIG. 17 can be obtained. In this case, since the suction port 2a of the pump 2 faces the bottom Z, the water W near the bottom Z can be sucked in without leakage, and an excellent stirring action is obtained in addition to the original function of supplying fine bubbles NB. be able to.

  The fine bubble generator according to the present invention is a means for increasing the amount of dissolved oxygen in agricultural water, a means for dissolving and refining water-soluble fertilizers, or supplying oxygen to aquaculture and storage tanks for aquaculture. Widely available.

It is a side view which shows the use condition of the microbubble generator which is 1st Embodiment of this invention. It is a top view of the microbubble generator shown in FIG. It is a partially cutaway side view which shows the microbubble generator which comprises the microbubble generator shown in FIG. It is the sectional view on the AA line in FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is a side view which shows the use condition of the microbubble generator which is 2nd Embodiment of this invention. It is a top view of the fine bubble generator shown in FIG. It is a side view which shows the microbubble generator which comprises the microbubble generator shown in FIG. It is a top view of the fine bubble generator shown in FIG. It is a partially cutaway front view of the fine bubble generator shown in FIG. It is the EE sectional view taken on the line in FIG. It is the FF sectional view taken on the line in FIG. It is a partially notched side view which shows the use condition of the microbubble generator which is 3rd Embodiment of this invention. It is a top view which shows the microbubble generator shown in FIG. It is a side view which shows the other use condition of the microbubble generator shown in FIG. It is a side view which shows the microbubble generator which is 4th Embodiment of this invention.

Explanation of symbols

1, 2, 31, 41 Fine bubble generator 2 Pump 2a Suction port 3 Electric motor 4, 24, 34 Fine bubble generator 4a Cylindrical casing 5 Power cord 6 Switch 8 Water discharge part 9 Intake pipe 10 Pressure gauge 11 Open / close valve 12 Air cleaner 13 Check valve 14, 24a, 24b Gas-liquid swirl chamber 14a Inner peripheral surface 15, 25 Liquid introduction path 15a Blocking plate 15b Outlet 15c Connecting part 16, 26 Gas introduction path 16a, 26a Front end opening 17, 27 Gas-liquid outlet 18 Gas-liquid guide member 18a Plane 18b, 18c Connecting member 19 Air outlet 25c Liquid chamber 25d, 25e Opening 29, 39 Gas-liquid guide tube NB Fine bubble R Swirling flow S Axis W Water Z Bottom

Claims (5)

A cylindrical gas-liquid swirl chamber in which gas-liquid can swivel around an axis, and the gas-liquid swirl chamber for introducing liquid into the gas-liquid swirl chamber and generating a gas-liquid swirl flow in the gas-liquid swirl chamber A liquid introduction path for ejecting liquid in a direction that forms a twist position with respect to the axis of the gas, and a gas introduction path formed to communicate with the gas swirl chamber that opens outward to introduce gas into the gas swirl chamber And a fine bubble generator comprising a gas-liquid discharge port formed at an end in the axial direction of the gas-liquid swirl chamber,
A liquid-proof pump that supplies the liquid sucked from a suction port provided in a portion that can be immersed in the liquid to the liquid introduction path;
And a liquid-proof electric motor for operating the pump ,
The liquid introduction path has a cylindrical shape, and a connection part with a water discharge part of the pump is provided at a base end thereof, and a distal end of the liquid introduction path is opposite to a gas liquid discharge port of the gas liquid swirl chamber. An end of the gas-liquid swirl chamber is disposed so as to protrude into the gas-liquid swirl chamber, and the distal end portion is closed by a closing plate, and an axis of the gas-liquid swirl chamber is disposed on the outer periphery of the liquid introduction path located in the gas-liquid swirl chamber. A plurality of jet outlets are provided for jetting liquid in the direction of twisting with the center, and a portion wider than the inner diameter of the connecting portion on the base end side is provided inside the tip end side of the liquid introduction path,
The gas introduction path penetrates through the side surface of the liquid introduction path and enters the inside thereof, and after bending in the axial direction, the tip opening of the shaft on the gas-liquid swirl chamber side of the closing plate A microbubble generator characterized by being opened on the heart .   The fine bubble generating apparatus according to claim 1, wherein a liquid jet port of the liquid introduction path is provided at a position away from an inner peripheral surface of the gas-liquid swirl chamber.   The fine bubble generator according to claim 1 or 2, wherein an opening of the gas introduction path is disposed on an axis of the gas-liquid swirl chamber.   The fine bubble generating device according to any one of claims 1 to 3, wherein a gas-liquid guiding member having a plane or a curved surface intersecting with the axial direction is disposed at a position facing the gas-liquid discharge port.   The fine bubble generating device according to any one of claims 1 to 3, wherein a gas-liquid guide tube protruding in a gas-liquid discharge direction from the gas-liquid discharge port is communicated with the gas-liquid discharge port.

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