JP6691713B2 - Disk type fine bubble generating method and device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method and apparatus for generating disk-shaped fine bubbles, and more particularly to a method and apparatus for rotating a disk in a liquid phase to generate fine bubbles.

  For the purpose of improving / improving the water quality, fine bubbles may be supplied to water in aquaculture ponds of seafood, closed water areas of lakes / marshes / rivers / lakes, wastewater treatment plants, sewage treatment plants, etc. (See Patent Documents 1 and 2). The fine bubbles are fine bubbles having a particle size of 100 μm or less (for example, several tens of μm to several μm), which are also called fine bubbles, microbubbles, or nanobubbles, and are not found in ordinary bubbles (for example, bubbles having a particle size of 1 mm or more). For example, it has a small buoyancy and floats in water for a long time to reach various parts, and also has a feature that it floats in water and shrinks and disappears (completely dissolves).

  By supplying the fine bubbles to water and completely dissolving them, for example, it is expected that the dissolved oxygen concentration in various parts of the water can be efficiently increased and the water quality can be improved and improved. It has also been reported that water containing fine bubbles has an active effect on microorganisms, plants, and animals, and can be used, for example, to increase the yield of eggplants, tomatoes, and the like (see Non-Patent Document 1). Further, in the fields of pharmaceuticals and foods, fine gas bubbles containing various gases (oxygen, ozone, nitrogen, etc.) are used. For example, it is recognized that fine gas bubbles containing ozone gas have a strong bactericidal effect. ing.

  One example of a conventional method for supplying fine bubbles into water (in liquid) is to pass the liquid through a small-diameter conduit at high speed, and to suck the gas into the liquid by using the negative pressure generated by the liquid flow. It is an ejector type in which suction gas is finely crushed by cavitation generated by the expansion of a pipe line downstream thereof to generate fine bubbles (see Non-Patent Document 2). For example, like a fine bubble generator 60 shown in FIG. 7A, a pump 63 and an ejector 62 are arranged in a liquid storage tank 61, and the liquid Q sucked by the pump 63 is supplied to a liquid flow path 64 and a flow rate adjusting valve 65. It circulates to the ejector 62 via the. Further, one end of a gas supply passage 66 is connected to the ejector 62, and an opening / closing cock 67 at the other end of the gas supply passage 66 is arranged above the liquid storage tank 61 (see Patent Document 1).

  FIG. 7B shows a sectional view of an example of the ejector 62. The ejector 62 of the illustrated example has a hollow portion (hollow pipe line) 62a for taking in the liquid Q from the liquid flow channel 64, and a cross-section is provided by providing a diameter-increased inlet (pipe line inlet) 62b on the upstream side thereof. A fine intake hole 62e is provided in the middle portion of the pipe line having a substantially T-shape and having a diameter smaller than that of the inlet to connect one end of the gas supply line 66. The liquid Q flowing in from the pipe inlet 62b produces a negative pressure when passing through the hollow portion 62a, and the gas G is sucked from the gas supply passage 66 through the fine suction holes 62e and mixed with the liquid. The mixed gas G is sent to the conduit outlet 62c together with the liquid Q, but is finely crushed by the cavitation caused by the expansion of the conduit at the outlet and is discharged as fine bubbles S.

  FIG. 7C shows a cross-sectional view of another example of the ejector (venturi) 62 in which the diameter-reduced portion 62d is provided in the middle portion of the hollow conduit 62a. The ejector 62 of the illustrated example is provided with a fine suction hole 62e that connects one end of the gas supply passage 66 to the reduced diameter portion 62d, and the liquid Q that has flowed in from the conduit inlet 62b is negative when passing through the reduced diameter portion 62d. A pressure is generated, and the gas G is sucked from the gas supply passage 66 through the fine suction holes 62e and mixed with the liquid. The gas G mixed with the liquid Q is crushed by the cavitation generated by the expansion of the pipeline on the downstream side, and becomes fine bubbles S and is discharged from the pipeline outlet 62c.

JP, 2005-334869, A JP, 2006-167612, A

Himuro Shozo "Fundamental of Fine Bubbles and Its Applications" Science Material No. 80, Jikkyo Shuppan, September 26, 2016, Internet <http: // www. jikkyo. co. jp / download / detail / 45/99992657592> Fine Bubble Society Association, Koichi Terasaka et al., "Introduction to Fine Bubbles, Chapter 6, Fine Bubble Generation Technology," Nikkan Kogyo Shimbun, November 28, 2016, pp. 167-192

  However, the conventional ejector-type micro-bubble generating method as shown in FIG. 7 requires pressurizing the gas by using a pump (pressurizing device), which requires a relatively large energy to generate the micro-bubbles. There is. In a fish farm or a closed water area, it is often necessary to continue supplying fine bubbles for a long period of time, which not only increases the cost when energy consumption increases, but also makes it difficult to apply it on the ocean where there is no continuous power source. Become. Also, when supplying fine air bubbles while circulating water in a fish farm, etc., the heat generation of the pressurizing device (pump) is gradually transmitted to the water and the water temperature rise that affects the growth of seafood (for example, as a pressurizing device). There is a possibility that the water temperature may rise by 20 ° C or more when a submersible pump is used and 10 ° C or more by a land pump. In order to suppress the energy consumption and the rise in water temperature to a small level, it is effective to supply fine bubbles without using a pressure device.

  Therefore, an object of the present invention is to provide a disk-type fine bubble generating method and device capable of efficiently generating fine bubbles with small energy consumption.

Referring to the embodiments of FIGS . 1 and 2, the disk-type microbubble generating method according to the present invention is applied to one side of the substrate 11 (the lower side in the illustrated example, see FIGS. 1D and 2D ) . A doughnut-shaped substrate 25 with a central hole 26 having the same outer diameter R0 as that of the substrate 11 is centered to face each other, and a length shorter than the difference (R0-R1) between the outer diameter R0 and the bore R1 in the facing gap. A plurality of hollow conduits 20 (see FIGS. 4 (A) and 4 (B)) are radially arranged in a donut-shaped region around the center O and attached to the opposite surface side of the substrate 11 (upper surface side in the illustrated example). , FIG. 1 (C) and FIG. 2 (C) ), a small through hole 16 reaching the hollow portion of each hollow conduit 20 is bored and the opposite side is airtightly covered (FIG. 1 (B)). ) and 2 a disc 10 provided with (B) refer) was immersed in the liquid phase Pb, in the disk 10 O to insert one end of the hollow rotating shaft pipe 30 communicates at the other end to the gas phase Pa with communicating in an airtight chamber 15, around the hollow rotary shaft pipe 30 rotates the disk 10 toroidal from the liquid phase Pb The liquid Q is caused to flow into each hollow conduit 20 through the central hole 26 of the substrate 25, and the gas G is sucked from the gas phase Pa into each hollow conduit 20 through the airtight chamber 15 and the minute through holes 16, The sucked gas is released from the outer periphery of the disk 10 while being finely crushed by expanding the flow path at the outlet of each hollow pipe 20.

In addition, referring to the embodiments of FIGS . 1 and 2, the disk type micro-bubble generator according to the present invention has one side of the substrate 11 (the lower side in the illustrated example, see FIGS. 1D and 2D ) . In addition, a doughnut-shaped substrate 25 with a central hole 26 having the same outer diameter R0 as that of the substrate 11 is centered and opposed to each other, and the facing gap is shorter than the difference (R0-R1) between the outer diameter R0 and the diameter R1. A plurality of hollow conduits 20 having a length (see FIGS. 4A and 4B) are radially arranged and attached to a donut-shaped region around the center O, and the opposite surface side of the substrate 11 (the upper surface in the illustrated example). Side, FIG. 1C and FIG. 2C) , the airtight chamber 15 (FIG. 1 ( B) and the disk 10 is provided to Fig 2 (B) refer), and inserted into the center O of the disk 10 A hollow rotary shaft pipe 30 having one end communicating with the closed chamber 15 and a drive device 40 for rotating the disk 10 around the hollow rotary shaft pipe 30 are provided. The disk 10 is immersed in the liquid phase Pb and the hollow rotary shaft pipe 30 is provided. Of the liquid phase Pb through the central hole 26 of the doughnut-shaped substrate 25 by the rotation of the disk 10 by the driving device 40, and the other end of the gas phase Pa is communicated with the gas phase Pa. From the outer periphery of the disk 10 while sucking gas into each hollow conduit 20 through the airtight chamber 15 and the minute through holes 16 and crushing the sucked gas finely by expanding the flow path at the outlet of each hollow conduit 20. It will be released more.

  In a preferred embodiment, as shown in FIG. 4 (C), a reduced diameter portion 21 can be provided in the hollow portion of each hollow conduit 20 of the disk 10 and the minute through holes 16 are provided in each hollow conduit 20. The reduced diameter portion 21 can be drilled. Further, as shown in FIGS. 1 and 2, the airtight chamber 15 of the disk 10 is formed by aligning the substrate 12 having the same diameter with the opposite surface side of the substrate 11 so as to face each other and sealing the peripheral portion of the facing gap. Can be formed.

  In a more preferred embodiment, as shown in FIG. 3, when the substrates 11 and 12 are opposed to each other to form the airtight chamber 15 of the disk 10, the non-opposed surfaces of the substrates 11 and 12 (see FIG. 3B). And (D)), a plurality of hollow conduits 20 are radially arranged and attached to the donut-shaped region around the center O, and are attached to the opposing surfaces of the substrates 11 and 12 (see FIG. 3C). Each minute through hole 16 reaching the hollow portion of each hollow conduit 20 is bored, and when the disk 10 rotates, the liquid is introduced from the liquid phase Pb into the hollow conduits 20 of the respective substrates 11 and 12, and the gas phase is formed. The gas is sucked from Pa, and the finely pulverized bubbles are discharged from the hollow conduit 20 of each of the substrates 11 and 12.

  In the preferred embodiment, as shown in FIG. 1 (A), a driving device 40 is connected to the other end of the hollow rotary shaft pipe 30, and a rotational speed adjusting means 43 is included in the driving device 40 so that the particles of the fine bubbles S are dispersed. The diameter is adjusted by the rotation speed ω of the disk 10 around the hollow rotary shaft pipe 30. Further, as shown in FIG. 1 (A), an intake air amount adjusting valve 32 is provided at the other end of the hollow rotary shaft pipe 30, and the particle size of the fine bubbles S is adjusted by the intake air amount adjusting valve 32 of the hollow rotary shaft pipe 30. It is also possible. In another preferred embodiment, as shown in FIG. 1F, the hollow rotating shaft pipe 30 includes a length adjusting mechanism 35, and the discharge depth of the fine bubbles S is adjusted by the adjusting mechanism 35 of the hollow rotating shaft pipe 30. To do. In yet another preferred embodiment, as shown in FIG. 5B, the disc 10 is provided with a guide plate 50 for guiding the fine bubbles S discharged from the outer periphery of the disc 10 in a predetermined direction.

The disk-type micro-bubble generating method and device according to the present invention is such that a donut-shaped substrate 25 with a central hole 26 having a predetermined outer diameter R1 and the same outer diameter R0 as that of the substrate 11 is aligned on one side of the substrate 11 and is opposed thereto. A plurality of hollow conduits 20 having a length shorter than the difference (R0-R1) between the outer diameter R0 and the bore R1 are radially arranged and attached to the gaps, and the hollow parts of the respective hollow conduits 20 are provided on the opposite surface side. A disk 10 provided with a micro through hole 16 reaching to it and having an airtight chamber 15 airtightly covering the opposite surface side is immersed in the liquid phase Pb, and one end of the hollow rotary shaft pipe 30 is inserted into the center O of the disk 10. The hollow tube is communicated with the airtight chamber 15 and the other end is communicated with the gas phase Pa, and the disk 10 is rotated around the hollow rotary shaft pipe 30 so that each hollow tube extends from the liquid phase Pb through the central hole 26 of the doughnut-shaped substrate 25. Liquid flow into channel 20 At the same time, gas is sucked from the gas phase Pa into each hollow conduit 20 through the airtight chamber 15 and the minute through holes 16, and the sucked gas is finely crushed by expanding the flow path at the outlet of each hollow conduit 20. However, since it is discharged from the outer periphery of the disk 10, the following advantageous effects are obtained.

(A) The liquid Q is caused to flow into each hollow conduit 20 by the centrifugal force around the hollow rotary shaft pipe 30 inserted in the center of the disk 10, and the negative pressure when the liquid Q passes through the hollow rotary shaft pipe 30 causes the liquid Q to flow from the hollow rotary shaft pipe 30. Since the gas G is introduced into the hollow conduit 20 to generate the fine bubbles S, it is not necessary to use a device for pressurizing the liquid such as a pump, and the energy consumption for generating the fine bubbles S can be suppressed to be small.
(B) Further, it is possible to simultaneously introduce the liquid Q and the gas G into the plurality of hollow pipelines 20 attached to the disc 10 to create the fine bubbles S, and depending on the number of the hollow pipelines 20 attached to the disc 10. The generation amount of the fine bubbles S can be appropriately adjusted.
(C) Since a large amount of fine bubbles S can be efficiently generated only by the driving energy for rotating the disk 10 around the hollow rotary shaft pipe 30, for example, even in the ocean where it is difficult to obtain a power source, solar power generation is possible. By combining with natural energy or the like, the required amount of fine bubbles S can be continuously supplied for a long period of time.

(D) It is also possible to adjust the diameter R0 of the disk 10, the rotation speed ω, the amount of gas taken in from the hollow rotary shaft pipe 30, and the like to adjust the particle size and concentration (generation amount) of the fine bubbles generated. It is possible to supply the fine bubbles S having an optimum particle size in consideration of the water quality of the target water area, the use of the fine bubbles, and the like.
(E) Since the pump 10 is not used and the rotary drive device 40 of the disk 10 can be arranged on the surface of the water, there is no fear that the water temperature will rise even if it continues for a long period of time at a fish farm or the like. The fine bubbles S can be continuously supplied for a long period of time without affecting the growth or the like.
(F) In the conventional method using a pump, since the fine bubbles are discharged in one direction, it was often necessary to use a plurality of devices to spread the fine bubbles over a wide range, but the outer circumference of the rotating disk In the present invention, which is capable of radiating fine bubbles in a radial direction from 360 degrees, fine bubbles can be emitted so as to permeate a wide range by a single device.

Hereinafter, modes and embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
FIG. 3 is an explanatory view of an embodiment of a disc type fine bubble generator according to the present invention. FIG. 7 is an explanatory view of another embodiment of the disc type fine bubble generator according to the present invention. It is explanatory drawing of the other Example of the disk type micro bubble generator by this invention. It is explanatory drawing of an example of the generation principle of the microbubble in this invention. It is explanatory drawing of the discharge method of the microbubble in this invention. It is explanatory drawing of the Example of the microbubble apparatus of this invention connected with the gas supply apparatus. It is explanatory drawing of an example of the conventional fine bubble generator.

  FIG. 1 shows an embodiment of the fine bubble generator 1 of the present invention applied to a target water area such as a culture pond or a closed water area. The generator 1 of the illustrated example has a disk 10 having a plurality of hollow pipes (hollow pipes) 20 mounted on one side and an airtight chamber 15 on the opposite side, and an airtight chamber 15 inserted into the center O of the disk 10. The hollow rotary shaft pipe 30 has one end communicating with the drive shaft 40, and the drive device 40 that rotates the disk 10 around the hollow rotary shaft pipe 30.

  As shown in FIG. 1 (A), the disk 10 is horizontally immersed in the liquid phase of the target water area, and the other end of the hollow rotary shaft pipe 30 is vertically projected above the liquid level to communicate with the gas phase. By rotating the disk 10 around the hollow rotary shaft pipe 30 at a required rotation speed ω at 40, the fine bubbles S are generated in each of the hollow conduits 20. Hereinafter, the present invention will be described with reference to the illustrated examples, but the application target of the present invention is not limited to aquaculture ponds and closed water areas, and can be applied to various applications in which fine bubbles are required. ..

  The disk 10 of the illustrated example has a circular substrate 11 having a predetermined diameter R0, a plurality of hollow conduits 20 radially attached to one surface side (the lower surface side in the illustrated example) of the substrate 11, and the opposite surface side of the substrate 11 (see FIG. In the example shown, it is configured with an airtight chamber 15 that hermetically covers the upper surface side). Although the substrate 11 in the illustrated example has a circular shape, the substrate 11 may have a polygonal shape (for example, a regular polygonal plate). The plurality of hollow conduits 20 are, for example, hollow pipes having a cylindrical, rectangular, or polygonal cross section and a length L1 shorter than the diameter R0 of the substrate 11, but all have the same shape and length. It is desirable to do.

  As shown in FIG. 1D, a plurality of hollow conduits 20 are formed in a donut-shaped region radially separated from a center O on one surface side of the substrate 11 by a distance R1 (= R0-L1). And arrange them in a radial pattern. A central void 23 having a predetermined diameter R1 communicating with the hollow portion of each hollow conduit 20 is formed in a central portion surrounded by the plurality of hollow conduits 20 (center on one side of the substrate 11) (see FIG. 4). At the outer edge of the substrate 11, gaps 22 are formed between the hollow conduits 20 and irregularities are formed on the surface of the substrate 11. However, if necessary, by filling the gaps 22 with a suitable filler, The surface of 11 can be smoothed.

  On the opposite side of the substrate 11 of the disk 10, as shown in FIG. 1 (C), a plurality of minute through holes 16 reaching the hollow portion of each hollow conduit 20 are formed at a required angular interval θa, and As shown in (B), an airtight chamber 15 that airtightly covers the opposite surface side is provided. As shown in FIG. 1 (E) which is a cross-sectional view of FIG. 1 (A), the airtight chamber 15 has, for example, a substrate 12 of the same diameter on the opposite surface side of the substrate 11 so as to face each other. It can be formed by sealing the peripheral portions of the facing gaps of 12 with the sealing material 14. However, the shape of the airtight chamber 15 is not limited to the illustrated example, and for example, by covering the opposite side surface of the substrate 11 with a hemispherical airtight lid having the same diameter R0, the airtight cover of the opposite surface side of the substrate 11 can be achieved. The closed chamber 15 may be formed.

  As shown in FIG. 1A, since the disk 10 is immersed in the liquid phase Pb of the target water area, the substrates 11, 12 and the hollow pipe line 20 constituting the disk 10 are immersed in the liquid phase Pb for a long time. It is desirable to use a material that does not easily corrode (for example, metal or synthetic resin). When immersed in the liquid phase Pb, the liquid Q fills the hollow portion of each hollow conduit 20 of the disk 10 and the central void 23 surrounded by each hollow conduit 20, respectively, as shown in FIG. 1 (E). By rotating the disk 10 around the hollow rotary shaft pipe 30, a liquid flow at a required speed can be formed in the hollow portion of the hollow conduit 20.

  That is, when the disk 10 is rotated as shown in FIG. 1E, the liquid Q filled in the hollow conduit 20 is discharged to the conduit outlet 20a by the centrifugal force F, and a new liquid Q is discharged from the central void 23. It is possible to form a liquid flow of a required velocity that flows from the center of the disk 10 toward the outer periphery in the hollow portion of each hollow conduit 20 (see also FIG. 4). Further, the negative pressure generated by the liquid flow allows the gas G to be sucked from the airtight chamber 15 of the disk 10 into the hollow conduit 20 through the minute through holes 16 and mixed with the liquid Q. Since the airtight chamber 15 is filled with the gas, the liquid Q does not flow back into the airtight chamber 15 through the minute through holes 16.

  The hollow rotary shaft pipe 30 to be inserted into the center O of the disk 10 is provided with an intake hole 31 and an exhaust hole 33 at one end and the other end, respectively, and the intake hole 31 and the exhaust hole 33 are communicated with each other in the hollow portion. As shown in FIG. 1 (E), one end of the hollow rotary shaft pipe 30 is inserted into the center of the disk 10, and the exhaust hole 33 is fixed so as to communicate with the airtight chamber 15. For example, as shown in FIG. 1 (F), the pipe 30 and the disk 10 are fixed to each other by using a pair of annular pressing members (pressing bosses or the like) 36 and 37 fitted in one end of the hollow rotary shaft pipe 30. You can

  Further, as shown in FIG. 1 (A), the other end of the hollow rotary shaft pipe 30 is exposed on the liquid surface so that the intake hole 31 communicates with the gas phase Pa. It is desirable that an intake amount adjustment valve 32 be provided in the intake hole 31 so that the flow rate of the gas G taken into the airtight chamber 15 can be adjusted. As shown in FIG. 1E, the hollow rotary shaft pipe 30 functions as a rotary shaft of the disk 10 and also as a flow path for taking gas into the airtight chamber 15.

  That is, when the disk 10 is rotated as shown in FIG. 1 (E), the gas G in the airtight chamber 15 is sucked into each central pipeline 20 and the pressure is reduced, but the hollow G of the hollow rotary shaft pipe 30 Since the airtight chamber 15 communicates with the gas phase Pa, the gas G is replenished from the gas phase Pa to the airtight chamber 15. Further, the pressure of the airtight chamber 15 is adjusted by adjusting the flow rate of the gas G replenished in the airtight chamber 15 by the intake air amount adjusting valve 32, and thus the gas sucked from the airtight chamber 15 to each hollow conduit 20. The flow rate of G can be adjusted.

  Since the hollow rotary shaft pipe 30 is also immersed in the liquid phase Pb for a long period of time, it is desirable that the hollow rotary shaft pipe 30 is made of a material that is not easily corroded (for example, made of metal or synthetic resin). A hollow rotary shaft pipe 30 can be obtained by using a pipe made of metal or synthetic resin, and forming an exhaust hole 33 in the peripheral surface near one end and an intake hole 31 in the peripheral surface near the other end.

  The length of the hollow rotary shaft pipe 30 can be appropriately designed according to the depth of the disk 10 immersed in the liquid phase, but it is desirable to include a length adjusting mechanism 35 as shown in FIG. 1 (F). For example, the hollow rotary shaft pipe 30 is composed of a nested inner pipe 35a and an outer pipe 35b, and the length adjusting mechanism 35 is a mechanism for adjusting the insertion length of the inner pipe 35a with respect to the outer pipe 35b. By including the length adjusting mechanism 35, the depth of the disk 10 immersed in the liquid phase can be adjusted appropriately.

  The drive device 40 of the fine bubble generator 1 rotates the disk 10 immersed in the liquid phase around the hollow rotary shaft pipe 30. The drive device 40 is sufficient as long as it has an output enough to drive the disk 10 to rotate, and can be made small and lightweight. For example, as shown in FIG. 1 (A), a small and lightweight electric motor that can be mounted and connected to the other end of the hollow rotary shaft pipe 30 exposed on the liquid surface can be used as the drive device 40. The drive device 40 of the illustrated example includes a coupling 42, and the drive shaft 41 of the electric motor and the hollow rotary shaft pipe 30 are connected by the coupling 42. Further, when used in the sea or the like where connection to the power system is difficult, the drive device 40 can include a storage battery, a solar power generator, and the like.

  FIG. 5 (A) shows a method of generating fine bubbles using the fine bubble generator 1. One end of the hollow rotary shaft pipe 30 is inserted and fixed in the center of the disk 10, and the drive device 40 is connected to the other end. Next, the disk 10 is immersed in the liquid phase, and the disk 10 is rotated around the hollow rotary shaft pipe 30 at the required rotation speed ω by the driving device 40 that is projected on the liquid surface. Due to the centrifugal force F during this rotation, as shown in FIGS. 4A and 4B, the liquid Q flows into the hollow conduits 20 from the central void 23 of the disc 10, and the hollow conduits 20 are hollow. A liquid flow having a required speed is formed in the portion from the center of the disk 10 toward the outer circumference.

  As shown in FIGS. 4A and 4B, each hollow conduit 20 of the disc 10 functions similarly to the ejector 62 described above with reference to FIG. 7B. That is, a negative pressure is generated by the liquid flow passing through the relatively narrow hollow space 20 from the relatively large central void 23, and the negative pressure causes the gas G to be sucked from the airtight chamber 15 into each hollow space 20. Mixed with the liquid Q. The mixed gas G is sent to the conduit outlet 20a together with the liquid Q, but it is finely crushed by the cavitation caused by the expansion of the conduit at the outlet, and becomes fine bubbles S to be discharged from the outer circumference of the disk to the liquid phase Pb.

  If necessary, as shown in FIG. 4C, a projecting member 21a is provided in the hollow portion of each hollow conduit 20 to form a reduced diameter portion 21, and the minute through hole 16 of the substrate 11 is formed in each hollow pipe. It can be drilled at a position corresponding to the reduced diameter portion 21 of the passage 20. By providing the reduced diameter portion 21 in the hollow portion of each hollow conduit 20, each hollow conduit 20 of the disk 10 functions similarly to the ejector (venturi) 62 described above with reference to FIG. 7C. Can be made

  In FIG. 5A, the particle size and the amount of the fine bubbles S discharged from the outer circumference of the disk can be adjusted by the diameter R0 of the disk 10 or the rotation speed ω of the disk 10 by the driving device 40. That is, the diameter R0 and the rotation speed ω of the disk 10 both affect the centrifugal force F during rotation of the disk 10, and the flow velocity of each hollow conduit 20 and the crushing action due to cavitation increase according to the centrifugal force F. By increasing the diameter R0 and the rotation speed ω, it can be expected that the particle diameter of the fine bubbles S discharged from the outer circumference of the disk can be reduced. Further, as the centrifugal force F increases, the negative pressure generated by the liquid flow also increases, and the amount of gas (intake amount) taken into each hollow conduit 20 increases, so the amount of fine bubbles S emitted from the outer circumference of the disk increases. Can be expected to increase.

  However, if the diameter R0 and the rotation speed ω are made too large, the gas G mixed with the liquid Q may be released before being sufficiently crushed, and conversely the particle size of the fine bubbles S may become large. Therefore, in order to release the fine bubbles S having a desired particle size and generation amount, the diameter of the disk 10 is adjusted so that the amount of intake air taken into the hollow conduit 20 and the crushing action are optimal values. It is effective to set R0 or the rotation speed ω.

  Preferably, as shown in FIG. 1A, the driving device 40 includes a rotation speed adjusting means 43, and the particle size and the amount of the fine bubbles S discharged from the outer circumference of the disk can be adjusted by the rotation speed ω of the disk 10. And Alternatively, a plurality of discs 10 having different diameters R0 are prepared, the discs 10 are made removable from the hollow rotary shaft pipe 30, and the diameter R0 of the disc 10 combined with the hollow rotary shaft pipe 30 is changed to change the particle size of the fine bubbles S and The amount generated can be adjusted. By making the diameter R0 or the rotation speed ω of the disk 10 adjustable, it is easy to set the diameter R0 or the rotation speed ω of the disk 10 to an optimum value in consideration of the water quality of the target water area, the use of fine bubbles, and the like. Becomes

  Further, in FIG. 5A, the particle size and the generation amount of the fine bubbles S discharged from the outer circumference of the disk can be adjusted by the intake amount from the intake hole 31 of the hollow rotary shaft pipe 30. That is, when the pressure of the airtight chamber 15 of the disk 10 changes according to the intake air amount and the pressure difference between the hollow pipe lines 20 increases, the flow rate of the gas G sucked from the airtight chamber 15 increases and the fine bubbles S When the particle size and the generation amount of the air bubbles become large and the differential pressure becomes small, the flow rate of the gas G sucked from the airtight chamber 15 becomes small and the particle size and the generation amount of the fine bubbles can also become small. Therefore, in order to discharge the fine bubbles S having a desired particle size and generation amount, it is effective to adjust the intake amount by the intake amount adjustment valve 32 provided in the intake hole 31 of the hollow rotary shaft pipe 30.

  Preferably, as shown in FIG. 2, a doughnut-shaped substrate 25 having a central hole 26 of the same diameter is aligned on one side of the substrate 11 of the disk 10 so as to face each other, and a plurality of hollow conduits 20 are connected to the substrate 11 and the donut. It is radially arranged in a gap facing the shaped substrate 25 at a required angular interval θb and attached. By providing the doughnut-shaped substrate 25, as shown in FIGS. 2 (D) and 2 (E), a plurality of liquid phases Pb are released from the liquid phase Pb through the central hole 26 (caliber R1) of the donut-shaped substrate 25 when the disk 10 rotates. The liquid Q can be introduced into the central space 23 surrounded by the hollow conduits 20 and the liquid Q can be caused to flow into each hollow conduit 20 while the liquid Q is accelerated by the centrifugal force F in the central space 23.

  That is, in the above-described embodiment of FIG. 1, the liquid Q cannot be accelerated in the central void 23 surrounded by the plurality of hollow pipes 20, and the liquid Q is accelerated to the required flow velocity in the hollow pipe 20. Therefore, it is necessary to use a relatively long hollow conduit 20 (length L1 = R0-R1). As shown in FIG. 2, by causing the liquid Q to flow into each hollow conduit 20 while accelerating in the central void 23, the required flow velocity can be achieved even in a relatively short hollow conduit 20 (length L2 <R0-R1). It is possible to decrease the angular interval θb of the hollow conduit 20 to increase the number of arranged tubes, and to increase the generation amount of the fine bubbles S discharged from the outer circumference of the disk. The inventor has found that the length L of the hollow pipeline 20 is not directly related to the particle size and the generation amount of the fine bubbles S, and the hollow pipeline 20 is arranged to increase the generation amount of the fine bubbles S. It was experimentally found that increasing the number is effective.

  Further, when the doughnut-shaped substrate 25 is provided as shown in FIG. 2, the size R1 of the central hole 26 of the donut-shaped substrate 25 can be used to adjust the particle size of the fine bubbles S emitted from the outer periphery of the disk. That is, when a plurality of hollow conduits 20 having a length L2 are radially arranged at the outer edge of the disk 10 as shown in FIG. 2D, the size of the central hole 26 of the donut-shaped substrate 25 causes the liquid Q When the diameter (= R0-R1) of the central void 23 for accelerating the flow rate fluctuates and the central hole 26 becomes large, the flow velocity flowing into each hollow conduit 20 from the central void 23 decreases, and the particle size and generation of the fine bubbles S occur. If the amount becomes large and the central hole 26 becomes small, the flow velocity flowing into each hollow conduit 20 from the central void 23 becomes large, and the particle size and the generation amount of the fine bubbles S can become small.

  However, if the central hole 26 of the doughnut-shaped substrate 25 is made too small, a large amount of energy is required to rotate the disk 10 around the hollow rotary shaft pipe 30, and when the drive device 40 having a predetermined output is used, the disk 10 is required. There is a risk that the rotation speed ω of will decrease. Therefore, in order to release the fine bubbles S having a desired particle size and generation amount, the size of the central hole 26 of the donut-shaped substrate 25 is adjusted so that the balance with the rotation speed ω by the driving device 40 is an optimum value. Setting R1 is effective.

  According to the present invention, the liquid Q is caused to flow into each hollow conduit 20 by the centrifugal force around the hollow rotary shaft pipe 30 inserted in the center of the disk 10, and the negative pressure when the liquid Q passes through causes the middle of the airtight chamber 15 to exit. Since the gas G is taken into the empty pipe line 20 to generate the fine bubbles S, it is not necessary to use a device for pressurizing the liquid such as a pump, and the energy consumption for generating the fine bubbles S can be suppressed small. Further, it is possible to simultaneously introduce the liquid Q and the gas G into the plurality of hollow pipes 20 attached to the disk 10 to create the fine bubbles S, and the fine bubbles S may be changed depending on the number of the hollow pipes 20 attached to the disc 10. The production amount of can be adjusted appropriately.

  In this way, it is possible to achieve the object of the present invention to provide a "disc-type fine bubble generating method and device capable of efficiently generating fine bubbles with small energy consumption".

  FIG. 3 shows a plurality of hollow conduits on the non-opposing surfaces of the substrates 11 and 12 when the substrates 11 and 12 are opposed to each other to form the airtight chamber 15 of the disk 10 as shown in FIGS. Another embodiment of the micro-bubble generating device 1 of the present invention in which 20 are radially arranged and attached will be shown. By arranging a plurality of hollow conduits 20 on each of the substrates 11 and 12 on both sides of the airtight chamber 15, the number of hollow conduits 20 to be arranged is increased as compared with the case of FIGS. 1 and 2. Therefore, it is possible to increase the amount of fine bubbles S emitted from the outer circumference of the disc.

  The airtight chamber 15 of FIG. 3 is similar to the embodiment of FIGS. 1 and 2, and substrates 11 and 12 of the same diameter are aligned and opposed to each other, and the peripheral edges of the opposing gaps of the substrates 11 and 12 are sealed with a sealing material 14. It is formed by sealing with (see FIG. 3E). As shown in FIG. 3 (B), a doughnut-shaped substrate 25 with a central hole 26 having the same diameter is aligned and opposed to the substrate 11 on one side of the airtight chamber 15, and the donut-shaped substrate 25 is provided with a facing gap. A plurality of hollow conduits 20 are radially arranged and attached at a required angular interval θb. Further, as shown in FIG. 3D, a doughnut-shaped substrate 25 having a central hole 26 of the same diameter is aligned with the substrate 11 on the opposite surface side of the airtight chamber 15 so as to face the donut-shaped substrate 25. A plurality of hollow conduits 20 are radially arranged and attached in the gap at required angular intervals θb.

  Further, as shown in FIG. 3 (C), minute through holes 16 are formed in each of the substrates 11 and 12 on both sides of the airtight chamber 15 from the facing surface side to the hollow portion of each hollow conduit 20. .. When the disc 10 is immersed in a liquid phase as shown in FIG. 3 (A) and the disc 10 is rotated around a hollow rotary shaft pipe 30 inserted in the center of the disc 10, as shown in FIG. 3 (E), Due to the centrifugal force F of rotation, the liquid Q flows into each of the plurality of hollow conduits 20 attached to each of the substrates 11 and 12, and flows into the hollow portion of each hollow conduit 20 from the center of the disk 10 toward the outer periphery. A liquid flow of velocity is formed and a negative pressure is generated. Due to the negative pressure, the gas G is sucked from the airtight chamber 15 into the hollow conduits 20 through the minute through holes 16 of the substrates 11 and 12 and mixed with the liquid Q. The mixed gas G is sent to the conduit outlet 20a together with the liquid Q, but it is finely crushed by the cavitation caused by the expansion of the conduit at the outlet, and becomes fine bubbles S to be discharged from the outer circumference of the disk to the liquid phase Pb.

  According to the embodiment of FIG. 3, a large amount of fine bubbles S can be efficiently generated only by the driving energy for rotating the disk 10 around the hollow rotary shaft pipe 30, so that it is difficult to obtain a power source such as the ocean. Also in the above, the necessary amount of fine bubbles S can be continuously supplied for a long period of time by combining with natural energy such as solar power generation. Further, since the rotary drive device 40 of the disk 10 can be arranged on the water surface without using a pump, there is no fear that the water temperature will rise even if it is continued for a long time in a fish farm or the like. The fine bubbles S can be continuously supplied for a long period of time without affecting growth or the like.

  FIG. 5B shows still another embodiment of the micro-bubble generator 1 of the present invention, which is provided with a guide plate 50 for guiding the micro-bubbles S discharged from the outer periphery of the disk 10 in a predetermined direction. In the fine bubble generation method using the conventional pressurizing device (pump, etc.) described above with reference to FIG. 7 (A), since the fine bubbles generated are normally discharged in one direction, the fine bubbles are spread over a wide range of the target water area. In many cases, multiple devices are required to spread the air bubbles, which causes the problem of increased energy consumption. On the other hand, as shown in FIG. 5 (A), the fine bubble generator 1 of the present invention can emit fine bubbles S radially from the outer periphery of the disk 10 rotating around the hollow rotary shaft pipe 30 by 360 degrees, With a single device, it is possible to discharge fine bubbles so that they permeate a wide range, and it has the advantage of improving and improving the water quality in a wide range with a small amount of energy consumption.

  However, when the fine bubble generator 1 is installed on the wall surface or the corner portion of the water tank, it is required to discharge the fine bubbles S in a direction where the wall surface of the water tank does not exist. In the embodiment shown in FIG. 5B, the guide plates 50 are arranged so as to face each other outside the required angular range of the outer peripheral surface of the disk 10 (angle range of about 180 degrees in the illustrated example) at a required interval. The bubble flow discharged from the outer periphery and sprayed on the guide plate 50 is guided in a predetermined direction along the facing surface of the guide plate 50. For example, the guide plate 50 facing the outer peripheral surface of the disk 10 facing the wall surface of the water tank is arranged, and the fine bubbles S emitted from the outer periphery of the disk 10 toward the wall surface of the water layer are directed by the guide plate 50 in the direction without the wall surface. Can be guided to. By combining the guide plates 50 as in the illustrated example, it is possible to obtain the fine bubble generation device 1 that discharges the fine bubbles S in a required direction.

  FIG. 6 shows an embodiment of the fine bubble generator 1 of the present invention in combination with a device 45 for supplying various gases (oxygen, ozone, nitrogen, etc.). As described above, in the fine bubble generator 1 of the present invention, the intake hole 31 at the other end of the hollow rotary shaft pipe 30 is communicated with the gas phase, and the gas in the vapor phase is taken into the disk 10 to form the fine bubbles S. You can However, in the fields of pharmaceuticals, foods, etc., it may be required to create the fine bubbles S that contain various gases (oxygen, ozone, nitrogen, etc.). In the embodiment of FIG. 6, the gas supply device 45 is connected to the intake hole 31 at the other end of the hollow rotary shaft pipe 30 via a mechanical seal or other suitable sealing member 46, and various gases supplied by the gas supply device 45 are connected. Can be supplied as fine bubbles S.

1. Rotating disk type micro bubble generator
10 ... Disk 11 ... Substrate 12 ... Substrate 14 ... Peripheral sealing material 15 ... Airtight chamber 16 ... Through hole 20 ... Hollow pipeline (hollow pipe) 20a ... Pipe outlet 21 ... Reduced diameter portion 21a ... Projection material 22 ... Pipe Gap 23 ... Central void 25 ... Donut-shaped substrate 26 ... Central hole 30 ... Hollow rotating shaft pipe 31 ... Intake hole 32 ... Intake amount adjusting valve 33 ... Exhaust hole 35 ... Length adjusting mechanism 36, 37 ... Annular presser material (presser foot) Boss)
39 ... Sealant 40 ... Drive device 41 ... Drive shaft 42 ... Coupling 43 ... Rotation speed adjusting means 45 ... Gas supply device 46 ... Seal member 47 ... Supply amount adjusting valve 48 ... Gas flow path 50 ... Guide plate 60 ... Ejector type Micro bubble generator
61 ... Liquid storage tank 62 ... Ejector 62a ... Hollow part 62b ... Pipe line inlet 62c ... Pipe line outlet 62d ... Reduced diameter part 62e ... Fine suction hole 63 ... Pump 64 ... Liquid flow passage 65 ... Flow rate adjusting valve 66 ... Gas supply passage 67 ... Opening / closing cock Pa ... Gas phase Pb ... Liquid phase S ... Fine bubbles L ... Hollow conduit length G ... Gas Q ... Liquid R0 ... Substrate diameter R1 ... Central void diameter (distance from center of donut-shaped region) )
θ: Mutual angular spacing of hollow conduits ω ... Rotational speed

Claims (12)

A doughnut-shaped substrate with a central hole having the same outer diameter R0 as the substrate and having a predetermined aperture R1 is aligned on one side of the substrate so as to face each other, and the difference (R0-R1) between the outer diameter R0 and the aperture R1 is set in the facing gap. A plurality of hollow pipes having a short length are radially arranged and attached to a donut-shaped region around the center, and minute through holes reaching the hollow part of each hollow pipe are bored on the opposite surface side of the substrate. A disk provided with an airtight chamber that airtightly covers the opposite surface is immersed in a liquid phase, and one end of a hollow rotary shaft pipe is inserted into the center of the disk to communicate with the airtight chamber and the other end to the gas phase. , Rotating the disk around the hollow rotary shaft pipe to allow liquid to flow from the liquid phase into each hollow conduit through the central hole of the donut-shaped substrate, and from the gas phase through the airtight chamber and the micro through holes. Sucking gas into the hollow pipe, Disk-type fine bubble generating method in which a release from the disc periphery with crushed finely by a flow channel expanding of the hollow conduit outlet gas. The method of claim 1 , wherein a reduced diameter portion is provided in the hollow portion of the hollow conduit of the disk, and the minute through holes are formed in the reduced diameter portion of each hollow conduit. .. 3. The disk according to claim 1 , wherein the airtight chamber of the disk is formed by aligning a substrate having the same diameter with the opposite surface side of the substrate so as to face each other, and sealing the peripheral portion of the facing gap. Mold micro bubble generation method. 4. The method according to claim 3 , wherein a plurality of hollow conduits are radially arranged and mounted in a donut-shaped region around the center on the non-opposing surface sides of the pair of substrates forming the airtight chamber of the disc, and the substrates are opposed to each other. Micro through holes are formed on the surface side to reach the hollow part of each hollow pipe, and liquid is made to flow into the hollow pipes of each substrate from the liquid phase and gas is sucked from the gas phase when the disk rotates. Then, the disk-type fine air bubble generation method in which finely pulverized air bubbles are discharged from the hollow conduits of the respective substrates. A doughnut-shaped substrate with a central hole having the same outer diameter R0 as the substrate and having a predetermined aperture R1 is aligned on one side of the substrate so as to face each other, and the difference (R0-R1) between the outer diameter R0 and the aperture R1 is set in the facing gap. A plurality of hollow pipes having a short length are radially arranged and attached to a donut-shaped region around the center, and minute through holes reaching the hollow part of each hollow pipe are bored on the opposite surface side of the substrate. A disk provided with an airtight chamber for airtightly covering the opposite surface side, a hollow rotary shaft pipe inserted into the center of the disk to communicate one end with the airtight chamber, and a drive device for rotating the disk around the hollow rotary shaft pipe. The disk is immersed in the liquid phase and the other end of the hollow rotary shaft pipe is communicated with the gas phase, and the disk is rotated by the driving device to move the liquid phase through the central hole of the donut-shaped substrate. Empty pipeline The outer periphery of the disk is made to flow the liquid and suck the gas from the gas phase into the hollow pipes through the airtight chamber and the minute through holes and finely crush the sucked gas by expanding the flow passage at the outlet of each hollow pipe. A disk-type fine bubble generator that emits more. Apparatus according to claim 5, a reduced diameter portion provided in the hollow portion of the hollow conduit of the disk, the disk-type fine bubble generating device comprising bored the minute through-hole in the reduced diameter portion of the hollow pipe .. 7. The apparatus according to claim 5 , wherein the airtight chamber of the disk is formed by aligning a cover plate of the same diameter on the opposite surface side of the substrate so as to face each other and sealing a peripheral portion of the facing gap. Disk type micro bubble generator. 8. The apparatus according to claim 7 , wherein a plurality of hollow conduits are radially arranged and mounted in a donut-shaped region around the center on the non-opposing surface sides of the pair of substrates forming the airtight chamber of the disk, and the substrates are opposed to each other. Micro through holes are formed on the surface side to reach the hollow part of each hollow pipe, and liquid is made to flow into the hollow pipes of each substrate from the liquid phase and gas is sucked from the gas phase when the disk rotates. Then, a disk-type micro-bubble generator that discharges finely pulverized bubbles from the hollow conduits of each substrate. 9. The disk-type fine bubble generating device according to claim 5 , wherein a drive device is connected to the other end of the hollow rotary shaft pipe, and the drive device includes a rotation speed adjusting means. The device according to any one of claims 5 to 9 , wherein the hollow rotary shaft pipe is provided with an intake air amount adjusting valve at the other end thereof. The device according to any one of claims 5 to 10 , wherein the hollow rotary shaft pipe includes a length adjusting mechanism. The apparatus of any of claims 5 to 11, in the disk, the disk-type fine bubbles emitted from the disk outer periphery comprising a guide plate for guiding in a predetermined direction fine bubble generator.