JP2015167946A - Micro-nano bubble generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a micro-nano bubble generating device that can efficiently generate micro-nano bubbles.SOLUTION: A micro-nano bubble generating device 10 includes: a gas-liquid generation tank 12 having multiple liquid injection holes 11 with cylindrical inner surfaces and for injecting liquid into an inner circumference tangential direction, having a short-circuiting wall 15 in one end side, and a gas-liquid outlet 16 on the other end side; an outer shell tank 13 at least partially covering the gas-liquid generation tank 12, and injecting the liquid supplied from a liquid feed port 21 from the liquid injection holes 11 to the gas-liquid generation tank 12; and gas supply means 14 for supplying gas to the gas-liquid generation tank 12. The micro-nano bubble generating device generates a swirl flow of the liquid turning along the cylindrical inner surface in the gas-liquid generation tank 12 by the liquid injected from the outer shell tank 13, and discharges it from the gas-liquid outlet 16. A gap 20 formed by a sidewall 18 forming a circumferential direction outer surface of the gas-liquid generation tank 12 and an inner surface 19 of the outer shell tank is assumed as a liquid flow path. The gap 20 is constituted to become narrow according to the reduction of a liquid flow rate supplied from the liquid feed port 21.

Description

  The present invention relates to a micro / nano bubble generating apparatus that generates micro / nano bubbles in a liquid.

  In recent years, technologies for generating fine bubbles in liquids have been used in various technical fields. For example, aquatic organisms are bred using water containing micro-nano bubbles containing micro- or nano-order fine bubbles in water. There are also known techniques for purifying and sterilizing contaminated water. Various devices for generating such micro-nano bubbles have been proposed.

  As an apparatus for generating such micro-nano bubbles, as shown in FIG. 4, the pressurized liquid fed from the fluid introduction path (liquid supply port) 97 is transferred from the gap S1 to the liquid injection hole 91a, and from the gap S2 to the liquid injection hole. The liquid that has sequentially passed from the gap S3 to the liquid injection hole 91c, from the gap S4 to the liquid injection hole 91d, and has not been sent to the gas-liquid generation tank 92 through the liquid injection hole 97 again from the fluid introduction path 97 through the gap S1. Together with the pressurized liquid that was sent.

  The liquid sent from each liquid injection hole becomes a swirl flow in the gas-liquid generating tank 92, and a gas is introduced from a gas introduction port (gas supply port) 94 to a negative pressure portion generated on the swirl axis of the swirl flow. Discloses an apparatus for generating micro-nano bubbles in a liquid to be derived (see Patent Document 1).

JP 2008-290011 A

  However, in the above-described micro / nano bubble generating device, when a part of the pressurized liquid moving through the gap S1 is sent to the liquid injection hole 91a, the flow rate of the liquid remaining in the gap S2 is reduced, so that the liquid pressure is lowered and the liquid is discharged from the gap S2. The flow rate of the liquid fed into the injection hole 91b is smaller than that of the liquid injection hole 91a. Similarly, the flow rate of the liquid that can be further fed to the liquid injection hole 91c and the liquid injection hole 91d is reduced, and there is a problem that micro-nano bubbles cannot be generated efficiently.

  The present invention solves such a conventional problem, and the flow rate of the liquid flowing into each liquid injection hole sequentially from the liquid supply port along the liquid flow does not decrease, and any liquid injection hole can be used. It is an object of the present invention to provide a micro / nano bubble generator capable of injecting a liquid into a gas / liquid generating tank at a substantially uniform flow rate and generating micro / nano bubbles efficiently.

  The micro / nano bubble generating device of the present invention has a cylindrical inner surface, a plurality of liquid injection holes for injecting liquid in the circumferential tangential direction of the inner surface, a short-circuit wall on one end side, and a gas on the other end side. A gas-liquid generating tank having a liquid discharge port, an outer shell tank that at least partially covers the gas-liquid generating tank, and injects liquid supplied from the liquid supply port into the gas-liquid generating tank through the liquid injection hole; Gas supply means for supplying gas to the liquid generation tank.

  The liquid injected from the outer shell tank generates a swirling flow in which the liquid swirls along the inner surface of the cylinder in the gas-liquid generating tank, and the gas supplied by the gas supply means is converted into micro-nano bubbles by the shearing force of the swirling flow. This is a micro / nano bubble generating device that generates a gas / liquid in which a micro-nano bubbled gas and a supplied liquid are mixed and discharges the gas / liquid through a gas / liquid discharge port.

  A gap formed between the side wall forming the outer circumferential surface of the gas-liquid generating tank and the inner surface of the outer shell tank is used as a liquid flow path, and the gap is in accordance with a decrease in the flow rate of the liquid supplied from the liquid supply port. It is configured to be narrow.

  According to the present invention, the liquid supplied from the liquid supply port is injected into the gas-liquid generation tank at a substantially uniform flow rate from the plurality of liquid injection holes without wastefully circulating the liquid in the outer shell tank. Nano bubbles can be generated.

The figure for demonstrating the structure of the micro nano bubble generator which concerns on the 1st Embodiment of this invention The figure for demonstrating the structure of the micro nano bubble generator which concerns on the 2nd Embodiment of this invention. The figure for demonstrating the structure of the micro nano bubble generator which concerns on the 3rd Embodiment of this invention. The figure which shows the structure of the conventional micro nano bubble generator

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1A is a perspective view of the micro / nano bubble generating apparatus according to the first embodiment of the present invention, and FIG. 1B is a gas-liquid generating tank at a position where the liquid injection holes 11a and 11b are formed. 12 is a cross-sectional view taken along a direction orthogonal to the axial direction, and FIG. 1C is a cross-sectional view taken along a gas-liquid generating tank along the axial direction.
The micro / nano bubble generating apparatus 10 includes a gas / liquid generating tank 12, an outer shell tank 13, and a gas supply unit 14.

  Water that is liquid is pre-pressurized and supplied from the liquid supply unit 21, and air that is gas is pre-pressurized and supplied from the gas supply unit 14 to the water to supply water mixed with air bubbles to the liquid supply port 17 is configured so as to be supplied to 17.

  The gas-liquid generating tank 12 has a cylindrical inner surface, has two liquid injection holes 11a and 11b for injecting water in the circumferential tangential direction of the inner surface, has a short-circuit wall 15 on one end side, and has the other end side. Has a gas-liquid discharge port 16. The outer shell tank 13 partially covers the gas-liquid generation tank 12 and injects water mixed with bubbles supplied from the liquid supply port 17 into the gas-liquid generation tank 12 through the liquid injection holes 11a and 11b.

  A gap 20 formed between the side wall 18 forming the circumferential outer surface of the gas-liquid generating tank 12 and the inner surface 19 of the outer shell tank 13 is used as a water flow path, and the cylindrical axis of the gas-liquid generating tank 12 is used as the outer shell tank 13. The clearance 20 is shifted from the cylindrical shaft core so as to narrow as the flow rate of water supplied from the liquid supply port 17 decreases.

  The air-bubble mixed water injected from the outer shell tank 13 has a swirl flow in which the air-bubble mixed water swirls along the inner surface of the cylinder into the gas-liquid generating tank 12 at a substantially uniform flow rate from the liquid injection holes 11a and 11b. The air bubbles contained in the water are made into micro / nano bubbles by the shearing force of the swirling flow to generate gas / liquid in which the micro / nano bubbled air and water are mixed, and from the gas / liquid discharge port 16 into the water tank (not shown). )).

As described above, according to the present embodiment, the cylindrical axis of the gas-liquid generating tank 12 is shifted from the cylindrical axis of the outer shell tank 13 so that the gap 20 is supplied with water supplied from the liquid supply port 17. Since the flow rate is reduced in accordance with the decrease in the flow rate, the gas / liquid generating tank is supplied at a uniform flow rate from the liquid injection holes 11a and 11b without wastefully circulating the water supplied from the liquid supply port 17 in the outer shell tank. Therefore, micro-nano bubbles can be generated efficiently.
The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  For example, the liquid is not limited to water. Inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, carbonic acid, phosphoric acid, organic acids such as lactic acid, acetic acid, formic acid, citric acid, oxalic acid, sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, ammonia, etc. Salts such as bases and sodium chloride, aqueous solutions such as seawater, emulsions such as mayonnaise, suspensions such as blood, colloids such as paint and milk, alcohols such as methanol, ethanol, propanol, and isopropanol Organic solvents such as acetone, hexane, toluene, tetrachloroethylene, methyl acetate, and ethyl acetate, and mineral oils such as petroleum may be used.

  Furthermore, the gas is not limited to air. Rare gases such as hydrogen, deuterium, oxygen, ozone, nitrogen, carbon dioxide, chlorine, nitrogen dioxide, nitrogen monoxide, sulfur dioxide, sulfur monoxide, hydrogen sulfide, helium, argon, and neon may be used. Furthermore, the method of supplying water mixed with air bubbles is not limited to the method of mixing after pressurizing water and air separately. You may pressurize with a pump etc. after mixing the water and air before pressurization. According to this method, the air bubbles can be made fine in advance by the swirling flow of the pump, and the generation efficiency and quality of the micro / nano bubbles can be improved.

  Furthermore, the number of liquid injection holes is not limited to two, and may be two or more. Further, the arrangement of the liquid injection holes is not limited to one surface orthogonal to the axial direction of the gas-liquid generating tank 12, but may be disposed on a plurality of surfaces.

  Further, the gas supply means is not limited to the gas supply unit 14. The gas supply port provided in the short circuit wall mentioned later by 2nd Embodiment and 3rd Embodiment may be sufficient. Furthermore, the diameter of the liquid injection holes 11a and 11b is not limited to a straight shape. The inner surface side of the wall of the gas-liquid generating tank 12 described later in the third embodiment may be narrower than the outer surface side.

Further, as in the second embodiment to be described later, in the vicinity of the gas-liquid discharge port 16, the tip is directed to the gas-liquid discharge port 16, and a cone, a polygonal pyramid, and a bottom opening with a hollow inside. Alternatively, a polygonal pyramid cap or a cone with an open end or a polygonal pyramid cap may be fixedly installed on the gas-liquid generating tank 12 or the like with a support. Thereby, spreading | diffusion of the micro nano bubble into a water tank is accelerated | stimulated, and coalescence of a micro nano bubble can be reduced.
(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 (a) shows the gas-liquid generating tank 32 orthogonal to the axial direction at the position where the liquid injection holes 31a, 31b, 31c, 31d of the micro / nano bubble generating apparatus according to the second embodiment of the present invention are formed. It is sectional drawing cut | disconnected along the direction, FIG.2 (b) is sectional drawing which cut | disconnected the gas-liquid generating tank 32 along the axial direction.
The micro / nano bubble generating device 30 includes a gas / liquid generating tank 32, an outer shell tank 33, and a gas supply port 34.

  The gas-liquid generating tank 32 has a cylindrical inner surface, has four liquid injection holes 31a, 31b, 31c, 31d for injecting water in the circumferential tangential direction of the inner surface, and has a short-circuit wall 35 on one end side. The other end side has a gas-liquid discharge port 36. The outer shell tank 33 partially covers the gas-liquid generation tank 32 and injects water supplied from the liquid supply port 37 into the gas-liquid generation tank 32 from the liquid injection holes 31a, 31b, 31c, 31d.

  The gas supply port 34 is provided in the short-circuit wall 35. The gap 40 formed by the side wall 38 forming the outer circumferential surface of the gas-liquid generating tank 32 and the inner surface 39 of the outer shell tank 33 is used as a water flow path, and the shape of the cylindrical inner surface 39 of the outer shell tank 33 is deformed from the cylinder. Thus, the gap 40 is made narrower as the flow rate of water supplied from the liquid supply port 37 decreases.

  The water injected from the outer shell tank 33 generates a swirling flow in which water swirls along the inner surface of the cylinder in the gas-liquid generating tank 32 at a substantially uniform flow rate from the liquid injection holes 31a, 31b, 31c, 31d. The air supplied from the supply port 34 is made into micro / nano bubbles by the shearing force of the swirling flow to generate gas / liquid in which the micro-nano bubble-formed air and water are mixed, and the gas / liquid discharge port 36 in the water tank (not shown). To discharge.

  In the vicinity of the gas-liquid discharge port 36, a conical cap 45 having an opening at the tip is fixed to the gas-liquid generation tank 32 by a support 46 with the tip directed toward the gas-liquid discharge port 36. Thereby, spreading | diffusion of the micro nano bubble into a water tank is accelerated | stimulated, and coalescence of a micro nano bubble can be reduced.

As described above, according to the present embodiment, the shape of the cylindrical inner surface 39 of the outer shell tank 33 is deformed from the cylinder, and the gap 40 is made to correspond to a decrease in the flow rate of water supplied from the liquid supply port 37. Therefore, the water supplied from the liquid supply port 37 is not circulated unnecessarily in the outer shell tank, and the gas-liquid generating tank is supplied at a substantially uniform flow rate from the liquid injection holes 31a, 31b, 31c, 31d. Therefore, micro-nano bubbles can be generated efficiently.
The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  For example, the liquid is not limited to water as in the first embodiment. Further, the gas is not limited to air as in the first embodiment. Furthermore, the number of liquid injection holes is not limited to four, and may be two or more. Further, the arrangement of the liquid injection holes is not limited to one surface perpendicular to the axial direction of the gas-liquid generation tank 12 as in the first embodiment.

  Further, the gas supply means is not limited to the gas supply port provided in the short-circuit wall. A configuration similar to that of the first embodiment may be used. Furthermore, the diameters of the liquid injection holes 31a, 31b, 31c, and 31d are not limited to a straight shape. The inner surface side of the wall of the gas-liquid generating tank 32 described later in the third embodiment may be narrower than the outer surface side.

Further, the cap 45 is not limited to a cone having an opening at the tip, and may be a polygonal cone, or may not have an opening at the tip, and may be a cone or other pyramid, not a cap with a hollow inside at the bottom. good.
Furthermore, the shape of the cylindrical outer surface may be changed so that the cylindrical wall thickness becomes uniform, for example, according to the shape of the cylindrical inner surface 39 of the outer shell tank 33.
(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 (a) shows the gas-liquid generating tank 52 orthogonal to the axial direction at the position where the liquid injection holes 51a, 51b, 51c, 51d of the micro / nano bubble generating apparatus according to the third embodiment of the present invention are formed. It is sectional drawing cut | disconnected along the direction, FIG.3 (b) is sectional drawing which cut | disconnected the gas-liquid generating tank 52 along the axial direction.
The micro / nano bubble generating device 50 includes a gas / liquid generating tank 52, an outer shell tank 53, and a gas supply port 54.

  The gas-liquid generation tank 52 has a cylindrical inner surface, has four liquid injection holes 51a, 51b, 51c, 51d for injecting water in the circumferential tangential direction of the inner surface, and has a short-circuit wall 55 on one end side. The gas-liquid discharge port 56 is provided on the other end side. The diameters of the liquid injection holes 51a, 51b, 51c, 51d are narrower on the inner surface side of the wall of the gas-liquid generating tank 52 than on the outer surface side. The outer shell tank 53 partially covers the gas-liquid generating tank 52 and injects water supplied from the liquid supply port 57 into the gas-liquid generating tank 52 from the liquid injection holes 51a, 51b, 51c, 51d.

  The gas supply port 54 is provided in the short-circuit wall 55. A gap 60 formed by the side wall 58 forming the outer circumferential surface of the gas-liquid generating tank 52 and the inner surface 59 of the outer shell tank 53 is used as a water flow path, and the shape of the cylindrical outer surface 58 of the gas-liquid generating tank 52 is changed from the cylinder. By deforming, the gap 60 is narrowed in accordance with a decrease in the flow rate of water supplied from the liquid supply port 57.

  Water injected from the outer shell tank 53 is fed into the liquid injection holes 51a, 51b, 51c, 51d at a substantially uniform flow rate, and the diameter of each liquid injection hole is narrower on the inner surface side of the gas-liquid generation tank wall than on the outer surface side. The flow rate of water injected into the gas-liquid generating tank 52 is increased, and a swirling flow in which water swirls along the inner surface of the cylinder is generated in the gas-liquid generating tank 52, and the air supplied from the gas supply port 54 is swirled. Micro-nano bubbles are generated by the shearing force of the flow, and a gas-liquid mixture of the micro-nano-bubbled air and water is generated and discharged from the gas-liquid discharge port 56 into a water tank (not shown).

As described above, according to the present embodiment, the shape of the cylindrical outer surface 58 of the gas-liquid generating tank 52 is deformed from the cylinder, so that the gap 60 is reduced in the flow rate of water supplied from the liquid supply port 57. Therefore, the liquid supplied from the liquid supply port 57 is generated in a substantially uniform flow rate from the liquid injection holes 51a, 51b, 51c, 51d without wastefully circulating the water supplied from the liquid supply port 57 in the outer shell tank. Since it is injected into the tank 52, micro-nano bubbles can be generated efficiently.
The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  For example, the liquid is not limited to water as in the first embodiment and the second embodiment. Further, the gas is not limited to air as in the first embodiment and the second embodiment. Furthermore, the number of liquid injection holes is not limited to four, and may be two or more. Further, the arrangement of the liquid injection holes is not limited to one surface perpendicular to the axial direction of the gas-liquid generating tank 12 as in the first and second embodiments.

  Further, the gas supply means is not limited to the gas supply port provided in the short-circuit wall. A configuration similar to that of the first embodiment may be used. Furthermore, the diameter of the liquid injection holes 51a, 51b, 51c, 51d is not limited to a shape in which the inner surface side of the wall of the gas-liquid generating tank 52 is narrower than the outer surface side. Like the first embodiment and the second embodiment, a straight shape may be used.

  Further, as in the second embodiment, a conical body, a polygonal pyramid, a bottom surface opening and a conical body with a hollow inside may be formed in the vicinity of the gas-liquid discharge port 56 with the tip directed toward the gas-liquid discharge port 56. A pyramid cap or a cone cone with an open end or a polygonal cone cap may be fixedly installed in the gas-liquid generating tank 52 or the like with a support.

  Further, the shape of the cylindrical inner surface 59 of the outer shell tank 53 is deformed from the cylinder, and the shape of the cylindrical outer surface 58 of the gas-liquid generating tank 52 is also deformed from the cylinder, so that the gap 60 is supplied from the liquid supply port 57. You may make it narrow according to the reduction | decrease in the flow volume of water.

Industrial applicability

  The micro / nano bubble generating apparatus according to the present invention is suitable as an apparatus for generating micro / nano bubbles for growing aquatic organisms, purifying contaminated water, sterilizing, and the like.

10, 30, 50 Micro-nano bubble generator 11a, 11b, 31a, 31b, 31c, 31d, 51a, 51b, 51c, 51d Liquid injection hole 12, 32, 52 Gas-liquid generation tank 13, 33, 53 Outer shell tank 14 Gas Supply portion 15, 35, 55 Short-circuit wall 16, 36, 56 Gas-liquid discharge port 17, 37, 57 Liquid supply port 18, 38, 58 Side wall of gas-liquid generation tank 19, 39, 59 Inner surface 20, 40 of outer shell tank , 60 Gap 21 Liquid supply unit 21
34, 54 Gas supply port 45 Cap 46 Support

Claims (10)

A gas-liquid generating tank having a cylindrical inner surface, a plurality of liquid injection holes for injecting liquid in the circumferential tangential direction of the inner surface, a short-circuit wall on one end side, and a gas-liquid discharge port on the other end side When,
An outer shell tank that at least partially covers the gas-liquid generation tank and injects liquid supplied from a liquid supply port into the gas-liquid generation tank from the liquid injection hole;
Gas supply means for supplying gas to the gas-liquid generation tank,
The liquid injected from the outer shell tank generates a swirling flow in which the liquid swirls along the inner surface of the cylinder in the gas-liquid generating tank, and the gas supplied by the gas supply means is microscopically generated by the shearing force of the swirling flow. A micro-nano bubble generating device that generates a gas-liquid mixed with the supplied liquid and the gas that has been converted into nano-bubbles into the micro-nano-bubble, and discharges it from the gas-liquid discharge port,
The gap formed by the side wall forming the outer circumferential surface of the gas-liquid generating tank and the inner surface of the outer shell tank is used as the liquid flow path, and the gap is the flow rate of the liquid supplied from the liquid supply port. A micro-nano bubble generating device configured to be narrowed in accordance with a decrease. 2. The micro / nano bubble generating device according to claim 1, wherein the diameter of the liquid injection hole is narrower on an inner surface side of the wall of the gas-liquid generating tank than on an outer surface side. The micro / nano bubble generating device according to claim 1, wherein the gas supply means is provided on the short-circuit wall. 3. The micro / nano bubble generating device according to claim 1, wherein the liquid is supplied to the liquid supply port in advance so that the liquid injection hole also serves as the gas supply unit. The micro-nano bubble generation according to any one of claims 1 to 4, wherein the gap is narrowed by shifting a cylindrical axis of the gas-liquid generating tank from a cylindrical axis of the outer shell tank. apparatus. The micro-nano bubble generating device according to any one of claims 1 to 4, wherein the gap is narrowed by deforming a cylindrical inner surface shape of the outer shell tank from the cylinder. The micro-nano bubble generating device according to any one of claims 1 to 4, wherein the gap is narrowed by changing a cylindrical outer surface shape of the gas-liquid generating tank from a cylinder. The micro-nano bubble generating device according to any one of claims 1 to 7, wherein a cone or a polygonal cone is installed in the vicinity of the gas-liquid discharge port so that a tip thereof faces the gas-liquid discharge port. 9. The micro-nano bubble generating device according to claim 8, wherein the cone or the polygonal cone is a cap having a bottom opening and a hollow inside. The micro-nano bubble generating device according to claim 9, wherein a hole is opened at a tip of the cap.

Images