JP3173135U - Microbubble generator and water treatment apparatus using the same - Google Patents

Abstract

A microbubble generator having a robust structure and excellent durability is provided.
An injection nozzle for injecting a fluid pressurized by a pressurizing unit to a microbubble generator, an injection pipe having a diameter larger than that of the injection nozzle provided on the downstream side of the injection nozzle, and the injection An air introduction port 13 provided between the nozzle and the injection pipe is provided, and when the pressure flow injected from the injection nozzle spreads all over the injection pipe, a negative pressure is applied to the injection pipe upstream of the pressure flow. The air is sucked from the air inlet by this negative pressure, and the microbubble mixed fluid generated by stirring, mixing and pressurizing the air is discharged.
[Selection] Figure 2

Description

  The present invention relates to a microbubble generating device, and more particularly to a microbubble generating device that can generate a large amount of bubbles having a diameter of 10 to 100 μm and is rich in durability, and a wastewater treatment device using the same.

  In recent years, a large number of microbubbles having a diameter of about 10 to 100 μm are generated to improve the dissolved oxygen concentration in water, which is useful for aquatic organism culture, drainage water quality improvement, and the like. The microbubble generation method generally includes a first stage in which a two-phase swirling flow of a liquid and a gas is generated, and a gas cavity that swirls at a high speed is formed in the center of the apparatus by the far-center separation. And a second stage for generating a large amount of microbubbles by cutting and crushing the cavity (for example, Non-Patent Document 1).

  Moreover, there exists a microbubble generator which arrange | positions a spherical body in the intermediate part of a pipe, and pressurizes and accelerates a water flow (for example, patent document 1).

Nano Planet Research Laboratories, Q & A “What is Microbubble Generation?” [Online], [searched July 28, 2006], Internet <URL: http://www.nanoplanet.co.jp/NP_q&a.html > JP 2003-305494 A

  However, the structure in which the periphery of the central axis is swung at high speed is mechanically complicated, and there is a problem that the number of parts of the apparatus increases and the manufacturing cost increases. In addition, there is a problem of lack of durability such as bearing wear accompanying high-speed turning.

  It is an object of the present invention to provide a microbubble generator capable of generating a large amount of bubbles having a diameter of 10 to several tens of μm, having a robust structure and having high durability, and a wastewater treatment apparatus using the microbubble generator. And

  In order to solve the above-described problems, a microbubble generator according to the present invention includes an injection nozzle that injects fluid pressurized by a pressurizing unit, and an injection that is provided downstream of the injection nozzle and has a larger diameter than the injection nozzle. A pipe and an air inlet provided between the injection nozzle and the injection pipe, and when the pressure flow injected from the injection nozzle spreads all the way into the injection pipe, the inside of the injection pipe on the upstream side of the pressure flow The main feature is that a negative pressure is generated, air is sucked from the air introduction port by this negative pressure, and the microbubble mixed fluid generated by stirring, mixing and pressurizing the air to the fluid is discharged.

  It is effective that the microbubble generator further includes a protrusion, a ridge, or a rod that extends or protrudes in the cross-sectional direction of the injection tube.

  In this case, it is effective that the protrusions, protrusions, or rods are provided at a plurality of locations in the flow direction of the injection pipe.

Further, the present invention is characterized by comprising the microbubble generator described above, a pressurizing means for supplying a fluid to the spray nozzle, and a drainage tank for storing the microbubble mixed fluid discharged from the spray pipe. The present invention relates to a water treatment apparatus.
It is preferable that the water treatment apparatus further includes an air diffuser that diffuses air by taking air into the drainage basin from the outside.

  The microbubble generator of the present invention injects pressurized fluid from the injection nozzle to the injection pipe, and the pressure flow spreading over the injection pipe creates a negative pressure upstream, thereby drawing air from the air inlet. To mix, agitate and pressurize the fluid to produce a microbubble mixed fluid. Since microbubbles are not accompanied by high-speed turning, a robust structure can be obtained, manufacturing costs can be reduced, and durability can be improved.

  Further, by providing a protrusion or rod-like member extending or projecting in the cross-sectional direction of the injection tube, the gas-liquid two-phase fluid passing through the injection tube is further cut and pulverized, or a microbubble is generated by generating a speed difference. Can be generated in large quantities.

  Further, by providing these protrusions or rod-like objects at a plurality of locations in the flow direction of the injection tube, a further gas-liquid two-phase fluid cutting / pulverizing effect can be obtained, and a larger amount of microbubbles can be generated.

  Furthermore, the water treatment device of the present invention is configured to generate a large amount of microbubbles in the drainage tank using the microbubble generator, and the dissolved oxygen concentration in water is improved by dissolution of the microbubbles and bubbles. High water quality improvement effect can be obtained. Moreover, the concentration of dissolved oxygen in water can be further increased by providing a conventional air diffuser in addition to this water treatment apparatus.

It is the schematic which shows the whole structure of the water treatment apparatus of this invention. It is a schematic sectional drawing which shows the detail of the microbubble generator shown in FIG. It is a figure for demonstrating operation | movement of the microbubble generator shown in FIG. It is a figure which shows the structure of another Example of a microbubble generator. It is a schematic sectional drawing of the AD line shown in FIG. 4, and is a figure explaining a flowing water cutting and crushing mechanism. It is the schematic which shows the structure of the further Example of the water treatment apparatus of this invention. It is a graph which shows the residual oxygen solubility in water shown for every use instrument.

  The best mode for carrying out the present invention will be described in detail below with reference to the drawings.

  FIG. 1 is a schematic diagram showing the overall configuration of a water treatment apparatus according to the present invention. As shown in FIG. 1, the water treatment apparatus of the present invention includes a microbubble generator 1, a pressure pump 2 that pressurizes and supplies wastewater to the microbubble generator, and a drainage / drainage tank 3. A known pressure pump can be used as the pressure pump 2, and the wastewater in the drainage tank 3 to be treated is sucked and pumped to the microbubble generator 1 side. Although not shown, a necessary and sufficient filter is provided at the suction port of the pressure pump 2 so that the dirt component in the drainage tank 3 is filtered in the previous stage.

FIG. 2 is an enlarged cross-sectional view showing details of the microbubble generator 1. As shown in the figure, a microbubble generator 1 includes an injection nozzle 11 that injects waste water pressurized by a pressure pump 2, and an injection pipe that is provided downstream of the injection nozzle 11 and has a larger diameter than the injection nozzle 11. 12 and an air inlet 13 provided between the injection nozzle 11 and the injection pipe 12. The injection nozzle 11 has a narrow tip, and the waste water from the pressure pump 2 is further pressurized here, and is 12 to ²⁰ m per second (for example, 14 m per second at a pressure flow rate of 1 kg / cm ² and a pressure flow of 2 kg / cm). ^{In this case} , the fuel is jetted at a speed of 29.8). In the case of a pressure flow of 1 kg / cm ² in this embodiment, the injection nozzle 11 is 35 mm, the injection tube 12 has an inner diameter of 42.6 mm, a length of 350 mm, the suction air volume is about 200 liters per minute, and the pressure flow is 1.5 kg / cm. ^In the case of ² , the injection nozzle 11 is 38 mm, the injection tube 12 has an inner diameter of 53.5 mm, a length of 450 mm, and the suction air volume is about 600 liters per minute. The injection pipe 12 spreads in the portion of the discharge port 14 on the downstream side, but the other portions have almost the same inner diameter.

  A plurality of air inlets 13 are arranged in an annular shape on the outer surface of the microbubble generator 1, and are configured so that outside air is taken in therefrom. The air inlet 13 communicates with a gap provided between the injection nozzle 11 and the injection pipe 12.

  The operation of this microbubble generator will be described with reference to FIG. The waste water pumped by the pressure pump 2 is further pressurized by the injection nozzle 11, and is jetted vigorously from the injection nozzle 11. The injection pipe 12 extends in this injection direction, and the jet flow from the injection nozzle 11 spreads in the injection pipe, and a piston of water that moves at high speed in the injection pipe is formed as shown by a hatched portion 15 in FIG. The As a result, a vacuum state is generated on the upstream side of the injection pipe 12, and air is sucked from the air inlet 13 and mixed, stirred, and pressurized into the waste water. By configuring as described above, a large amount of bubbles generated here become microbubbles having a diameter of 10 to several tens of μm, staying in water for a long time or dissolving, and the bubble contact area is expanded to increase the overall movement coefficient. Since it becomes large, dissolved oxygen concentration is improved and the water quality of the waste_water | drain introduced into the discharged drain tank 3 is improved.

  FIG. 4 is a schematic cross-sectional view showing the configuration of another embodiment of the microbubble generator. The microbubble generator 20 of the present embodiment includes a further fluid cutting / pulverizing mechanism 22 in the middle of the ejection pipe 21. The fluid cutting / pulverizing mechanism 22 is configured as a tube structure that connects between the divided injection tubes 21, and includes a fluid cutting rod that extends in the cross-sectional direction of the injection tube 21. FIG. 5 shows a cross-sectional structure taken along lines A to D in FIG. As shown as an example on the left side of FIG. 5, in each of the sections A to D, cutting bars intersecting with the cross shape are crossed in the cross-sectional direction, and the angles of the adjacent crosses are offset by 45 degrees. Has been placed. By comprising in this way, when the gas-liquid two-phase fluid which passes along the injection pipe 21 passes through this cutting rod, it is further cut and crushed, or a partial speed difference is generated to generate a larger amount of microbubbles. be able to.

  Note that the cross-shaped cutting bar does not necessarily extend over the entire diameter of the tube as in the example shown in the center row of FIG. 5, and may be configured as a plurality of protrusions protruding inward from the inner wall of the tube. Moreover, you may comprise by providing the plate member which obstruct | occludes a part of pipe | tube like the example shown in the right side column of FIG. Also in these cases, the adjacent protrusions and plate members in the portions A to D in FIG. Even in this case, a large amount of microbubbles can be generated by the gas-liquid two-phase fluid passing through the injection pipe 21 hitting the protrusion and bounced back and stirred.

Thus, the fluid mixed with a large amount of microbubbles is introduced into the drainage tank 3 of FIG. 1 through a discharge pipe (not shown). In this drainage tank 3, wastewater to be treated is introduced from another pipe, where it is mixed with discharge wastewater containing a large amount of microbubbles to improve water quality. The volume of the drainage tank 3 is preferably about 100 m ^{3 with} respect to the discharge amount 807 L / m of the microbubble generators 1 and 20.

  4 to 5, the cutting rods or protrusions are provided in four stages toward the flow direction of the injection tube. However, this is not limited to this example, and is 1 to 3 or 5 stages or more. A cutting rod or protrusion may be provided. Further, the cutting bar and the protrusion may be provided alternately, and the thickness and cross-sectional shape of the cutting bar and the protrusion, the length of the protrusion, and the like can be appropriately determined.

  FIG. 6 is a schematic view showing a configuration of a modified example of the water treatment apparatus according to the present invention. As shown in FIG. 6, the water treatment apparatus of the present embodiment includes an air diffuser 4 that sends air into the water of the drainage basin in addition to the configuration of the apparatus shown in FIG. This air diffuser takes in air from the outside by a blower device 41 and discharges it from a diffuser cylinder 42 formed at the bottom of the drainage feed 3 and formed, for example, a ceramic having a large number of uniform fine holes. FIG. 7 is a graph showing the solubility of the dissolved oxygen amount (DO), which shows only the aeration device 4, only the microbubble generator 1 of the present invention, and the DO solubility when these are combined. As shown in this figure, it can be seen that the amount of dissolved oxygen in water increases dramatically when used in combination with the diffuser 4 rather than using only the microbubble generator 1 of the present invention.

  In addition, the diffuser 4 used here can use suitably the well-known thing conventionally used for aeration, The structure and shape are not limited at all by this invention. For example, the scattering cylinder 42 may be a plate shape or a disk shape in addition to a cylindrical shape, and a filter is provided on the upstream side of the blower device 41.

  The microbubble generator of the present invention can be used not only for improving the quality of waste water but also for various applications suitable for applying microbubbles. Examples of such applications include water sterilization, aquaculture, fish farming, improvement of water quality in appreciation ponds, bubble agitation of cleaning equipment in medical equipment, hydroponics, oxygen supplementation such as oxygen traps and wastewater treatment in food machinery.

DESCRIPTION OF SYMBOLS 1,20 Microbubble generator 2 Pressure pump 3 Drainage tank 4 Aeration apparatus 11 Injection nozzle 12, 21 Injection pipe 13 Air inlet 14 Discharge part 41 Blower apparatus 42 Spread cylinder

Claims (5)

  An injection nozzle that injects fluid pressurized by the pressurizing means, an injection pipe that is provided downstream of the injection nozzle and has a larger diameter than the injection nozzle, and air that is provided between the injection nozzle and the injection pipe When the pressure flow injected from the injection nozzle spreads all over the injection pipe, a negative pressure is generated in the injection pipe on the upstream side of the pressure flow. Is a microbubble generator that discharges microbubble-mixed fluid generated by aspirating and agitating, mixing, and pressurizing air to the fluid.   The microbubble generator according to claim 1, further comprising a protrusion, a ridge, or a rod-like member extending or projecting in a cross-sectional direction of the injection tube.   The microbubble generator according to claim 2, wherein the protrusions, ridges, or rods are provided at a plurality of locations in the flow direction of the injection pipe.   A microbubble generator according to any one of claims 1 to 3, a pressurizing means for supplying a fluid to the spray nozzle, and a drainage tank for storing a microbubble mixed fluid discharged from the spray pipe. Water treatment device characterized by.   The water treatment apparatus according to claim 4, further comprising an air diffuser that diffuses air by taking air from outside into the drainage basin.

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