JP2019010608A - Micro bubble generating device - Google Patents

Abstract

To provide a micro bubble generating device that can be operated without being supplied with electric power from outside and accordingly allows for elimination of cost of an electric wire or the like.SOLUTION: A micro bubble generating device 1 is provided that comprises: a passage 21 causing water being liquid to flow; a lifting pump 22 for pumping up the water; a compression device 23 for force-feeding gas to the passage 21; and a bubble generating medium 24 for discharging the gas force-fed by the compression device 23 to the liquid in the passage 21 as a micro bubble, the bubble generating medium 24 being formed of a carbon-based porous raw material. The micro bubble generating device 1 further comprises a wind turbine 25 supplying motive power for driving the lifting pump 22 and the compression device 23, the wind turbine 25 comprises a rotary body 51 and a supporting body 52, the rotary body 51 comprising a cylindrical part 61, a wing 62 for receiving wind and a wing support arm 63 supporting the wing 62 and fixing it to the cylindrical part 61, and the supporting body 52 is a column support having a circular cross-section and coaxially connected at a prescribed interval to the cylindrical part 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique of an ultrafine bubble generating device that generates fine bubbles in a liquid.

  2. Description of the Related Art In recent years, attention has been paid to a technique using ultrafine bubbles having a bubble size (diameter) of several hundred nm to several tens of μm in liquids such as tap water, lakes, rivers, and seawater. The ultrafine bubbles have characteristics such as a very large surface area and physicochemical characteristics such as a self-pressurizing effect. By utilizing these characteristics, drainage purification, washing, body care in a bathtub, and seafood Technology for use in aquaculture has been developed. In particular, in fields such as drainage purification and fish and shellfish culture, a technique for efficiently dissolving air in water is required, and a technique using ultrafine bubbles is attracting attention as a solution.

  As a method for generating ultrafine bubbles having the above-mentioned characteristics, a liquid jet nozzle has been conventionally arranged around an air nozzle that discharges air pumped by a compressor, and is discharged from the air nozzle by the force of the jet of the liquid jet nozzle. A method of tearing bubbles to make them fine is known. In addition, a method of subdividing the bubbles while applying the aerated bubbles to the mesh member is also known (see, for example, Patent Document 1).

Japanese Patent No. 3958346

  However, the method of disposing the liquid jet nozzle around the air nozzle and tearing down the bubbles ejected from the air nozzle by the force of the jet of the liquid jet nozzle has a limit on the hole diameter of the nozzle and stabilizes the particle diameter. It is difficult. Further, when a liquid jet nozzle is used, it is necessary to increase the water pressure by a pump or the like. Pumps and the like are often driven by electric power, and these electric power is supplied by using industrial electric power. When industrial power is used, electric wires for transmission, transformers, and the like are required, which is costly. In addition, it has been difficult to install electric wires for transmitting industrial power under natural environments such as at sea or lake.

  Therefore, in view of such problems, the present invention can generate ultrafine bubbles having a small particle size by a simple method, and can use a renewable energy to generate an ultrafine bubble generator without receiving power supply from the outside. It is possible to provide an ultrafine bubble generating device that can operate the device and save the cost of an electric wire for supplying electric power from the outside.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in the present invention, a passage for flowing a liquid, a pump for pumping the liquid, a compression device for pumping gas to the passage, and the gas pumped by the compression device as ultrafine bubbles in the passage An ultrafine bubble generating device comprising a bubble generating medium that is discharged into a liquid,
The bubble generating medium is formed of a carbon-based porous material,
A windmill that supplies power for driving the pump and the compression device;
The windmill includes a rotating body and a support body,
The rotating body has a cylindrical portion, a wing for receiving wind, and a wing support arm that supports the wing and fixes the wing to the cylindrical portion,
The support is a column having a circular cross section connected coaxially with the cylindrical portion at a predetermined interval.

  In the present invention, it is preferable that a motor for assisting driving of the windmill may be provided when there is no wind.

  In the present invention, more preferably, a rotation sensor that detects a rotation speed of the windmill is provided, the rotation sensor and the motor are connected to a control device, and the control device has a constant rotation speed. When the value is less than or equal to the value, the motor may be controlled to be driven.

  In the present invention, more preferably, the pump has a suction port, and the suction port may be installed at a height of 0.5 m to 2 m from a lower surface of an installation base on which the windmill is installed. Good.

  In the present invention, more preferably, it may have a discharge port for discharging a liquid containing ultrafine bubbles, and the discharge port may be arranged at a position lower than the suction port.

  As effects of the present invention, the following effects can be obtained.

  In the present invention, ultrafine bubbles having a small particle size can be generated using wind power. By using wind power, which is a renewable energy, it is possible to operate the ultrafine bubble generating device without receiving power supply from the outside, and it is possible to save the cost of an electric wire for supplying power from the outside.

  Further, in the present invention, the ultrafine bubble generator can be operated by driving the motor even when there is no wind.

  Further, in the present invention, even when there is no wind or when the air volume is small, by driving the motor, it becomes possible to operate the ultrafine bubble generating device steadily, and the gas is dissolved or the ultrafine bubble is generated. As a result, it is possible to always supply a certain amount of coexisting liquid.

  In the present invention, since the suction port is located near the water surface, the liquid can be pumped even if the lift pressure is small.

  In the present invention, since the discharge port is located at a position lower than the suction port, it is easy to prevent the gas from being dissolved, or liquid coexisting as ultrafine bubbles from entering the suction port again, and the gas is dissolved, or Liquids that coexist as ultrafine bubbles can be produced efficiently.

The front view which showed the whole structure of the ultrafine bubble generator which concerns on one Embodiment of this invention. The front sectional view of the pipe concerning one embodiment of the present invention, and a bubble generation medium. The front view of the bubble generation medium which concerns on one Embodiment of this invention. The top view of the bubble generation medium which concerns on one Embodiment of this invention. The perspective view of the pipe | tube which concerns on one Embodiment of this invention. The block diagram of the control apparatus which concerns on one Embodiment of this invention. The flowchart which shows control of the auxiliary drive which concerns on one Embodiment of this invention. The front view which shows the channel | path when the ventilation hole which concerns on one Embodiment of this invention is open | released.

Next, embodiments of the invention will be described.
First, the overall configuration of an ultrafine bubble generating device 1 according to an embodiment of the present invention will be described with reference to FIG.
The ultrafine bubble generator 1 is an ultrafine bubble generator that generates ultrafine bubbles using wind power, which is renewable energy. Here, the ultrafine bubbles mean bubbles having a size (diameter) of less than 100 μm at normal temperature and normal pressure. As shown in FIG. 1, the ultrafine bubble generating device 1 is a device that supplies a liquid in which a gas is dissolved or coexists into a liquid. In the present embodiment, the liquid is seawater or fresh water such as a river or a lake. In the following description, water such as rivers and lakes is adopted as the liquid. The gas is air, oxygen, nitrogen, ozone or hydrogen peroxide. Wind used as wind power includes natural wind and artificial wind caused by wind tunnels. The gas generated as ultrafine bubbles is dissolved or coexists in water. Here, “dissolved” means a state in which a gas is dissolved in water. Moreover, coexistence means the state in which gas exists as ultrafine bubbles in water.

  The ultrafine bubble generator 1 is installed on an installation table. In the present embodiment, the installation base is composed of a float 2. The float 2 is a base having buoyancy and floats on the water surface. The float 2 has an upper part floating above the water surface and a lower part sinking below the water surface. A float 3 is connected to the float 2 to prevent it from moving outside a predetermined range.

  The ultrafine bubble generating device 1 includes a passage 21 for flowing water, a pumping pump 22 that is a pump for pumping water, a compression device 23 for pumping gas to the passage 21, and a gas pumped by the compression device 23. And a bubble generating medium 24 that discharges to the water in the passage 21 as ultrafine bubbles. The ultrafine bubble generating device 1 includes a pumping pump 22 and a windmill 25 that supplies power for driving the compression device 23.

  The passage 21 is a member for passing water. The upstream end of the passage 21 in the water flow is connected to the suction side pipe 31. Further, the middle part of the passage 21 is constituted by a pipe 26. Further, the downstream end of the passage 21 in the flow of water is connected to the discharge side pipe 32. The passage 21 is disposed above the upper surface of the float 2. In other words, the passage 21 is disposed above the water surface.

  A suction port 31 </ b> A is provided at the upstream end of the suction side pipe 31. The suction port 31A is disposed immediately below the float 2 and in shallow water that relatively contains air. Specifically, the shallow water containing air is 0.5 m to 2 m below the surface of the water. Thereby, compared with the case where 31 A of inlets are in a deep position, the pressure required for pumping can be reduced.

  A discharge port 32 </ b> A is provided at the downstream end of the discharge side pipe 32. The discharge port 32A is provided at a position deeper than the suction port 31A. In addition, the discharge side piping 32 can be arbitrarily extended to a position where it is desired to generate ultrafine bubbles. Thereby, water containing ultrafine bubbles can be discharged at a deep position. A vent hole 32 </ b> B is provided in the middle of the discharge side pipe 32. The vent hole 32B is configured to be openable and closable, and can be supplied to a closed system including the passage 21, the suction side pipe 31, and the discharge side pipe 32 by being opened.

  The pumping pump 22 is a device that pumps water into the passage 21. The pumping pump 22 pumps water upward by applying high pressure. The pumping pump 22 is a pump that pumps up water using the rotational force of the windmill 25, and is composed of, for example, a propeller pump. By using the rotational force of the windmill 25 as the rotational force of the propeller in the pumping pump 22, water flows in the direction of the rotation axis at the inlet and outlet of the propeller, and the pumping is performed.

  The compression device 23 is a device for pumping gas to the bubble generating medium 24. The compression device 23 is a device that compresses the airframe using the rotational force of the windmill 25, and is configured by, for example, a rotary compressor. Gas compression is performed by using the rotational force of the windmill 25 as the rotational force of the rotating body in the rotary compressor.

  As shown in FIGS. 1 and 2, the bubble generating medium 24 is disposed inside a pipe 26 that constitutes the middle part of the passage 21. The bubble generating medium 24 is arranged so as to be parallel to the direction (water-filled arrow direction in FIG. 2) in which the water in the pipe 26 flows. In the present embodiment, the bubble generating medium 24 is arranged so as to be parallel to the direction in which the water flows in the tube 26. However, the present invention is not limited to this, and the bubble generating medium is not limited to the tube 26. It may be arranged so that the downstream side is inclined downward with respect to the longitudinal direction.

The bubble generating medium 24 is made of a carbon-based porous material and has a large number of fine holes 24A having a diameter of several μm to several tens of μm, as shown in FIG. The bubble generating medium 24 is a conductor, and the bubbles generated from the bubble generating medium 24 are charged with negative charges. In other words, when free electrons are added to the ultrafine bubbles when passing through the bubble generating medium 24 that is a conductor, a negative charge is charged. This negative charge can prevent bubbles from repelling each other and coalescing into large bubbles.
The carbon-based porous material is a composite material containing only carbon or carbon and ceramic, and is an inorganic material. A film having a thickness of several nm is formed on the surface of the carbon-based porous material. The film is formed of an inorganic film containing silicon.

  As shown in FIGS. 3 and 4, the bubble generating medium 24 is formed in a polygonal column shape, and a bubble generating medium passage 41 is formed therein as an internal space. The bubble generating medium inner passage 41 is provided inside the bubble generating medium 24, and is provided with two types of parallel passages 41A having different cross-sectional diameters provided from one surface of the bubble generating medium 24 in parallel with the side in the short direction when viewed from the front. -It has 41B and the inclination channel | path 41C which connects said parallel channel | path 41A * 41B. The parallel passages 41A and 41B are configured by a first parallel passage 41A having a large cross-sectional diameter and a second parallel passage 41B having a small cross-sectional diameter.

  The first parallel passage 41A is formed so as to penetrate through the bubble generating medium 24. The second parallel passage 41B has one end communicating with the surface (upper surface) of the bubble generating medium 24 and the other end. It is disposed in the bubble generating medium 24. The first parallel passages 41A and the second parallel passages 41B are alternately arranged. The inclined passage 41C is a passage that connects the first parallel passage 41A and the second parallel passage 41B, and includes an upper end of the first parallel passage 41A and a lower end (closed end) of the second parallel passage 41B. It is the channel | path which connects. Gas is supplied from the compression device 23 to one upper end of the first parallel passage 41A.

  The total surface area of the surface of the bubble generation medium 24 where bubbles are generated is formed to be 2000 cm 2 or less. In the present embodiment, the surface of the bubble generating medium 24 where bubbles are generated is the side surface excluding the upper and lower surfaces of the polygonal column, and the total surface area is approximately 1600 cm 2.

  The tube 26 and the bubble generating medium 24 may be provided as a unit 45 as shown in FIG. The unit 45 in which the bubble generating medium 24 is arranged inside the tube 26 is configured to be connected in series in a direction parallel to the direction of the liquid flowing in the tube 26 (the direction of the black arrow in FIG. 2). That is, a cylindrical connecting portion 46 is provided at the upstream end portion and the downstream end portion of the pipe 26, and the units 45 are connected in series via the connecting portion 46. With this configuration, the ultrafine bubbles can be further supplied by the ultrafine bubble generator 1 to the water in which the ultrafine bubbles are already present. For example, in a method of generating ultrafine bubbles using a shearing force, if the shearing force is continuously applied, the ultrafine bubbles are recombined, so the amount of coexisting ultrafine bubbles is rather reduced. On the other hand, by arranging the bubble generating medium 24 in series in the liquid flow direction, the time for the liquid to contact the bubble generating medium 24 is lengthened, and the liquid flow is effectively used to reduce the high concentration with a small amount of power. Fine bubbles can coexist. Further, since the bubble generating medium 24 is arranged in series, it can coexist without recombining the ultrafine bubbles. By comprising in this way, the quantity of the ultrafine bubble which coexists in the liquid can be increased.

  The windmill 25 is a device that converts wind energy into dynamic energy by rotating blades 62 using wind power, which is renewable energy, as a power source. The windmill 25 is installed in the float 2. The windmill 25 includes a rotating body 51 and a support body 52.

The rotating body 51 includes a cylindrical portion 61, a wing 62 for receiving wind, and a wing support arm 63 that supports the wing 62 and fixes the wing 62 to the cylindrical portion 61. The cylindrical portion 61, the wing 62, and the wing support arm 63 are preferably made of a lightweight, high-strength and durable material such as a metal such as aluminum, carbon fiber, or plastic resin.
The support body 52 is a column having a circular cross section that is coaxially connected to the cylindrical portion 61 at a predetermined interval. The support body 52 is comprised by the cylindrical column, The shaft 64 is rotatably provided in the inside. In addition, the rotating body 51 is rotatably supported on the upper part of the support body 52.

The cylindrical portion 61 is a hollow cylindrical portion having a diameter larger than that of the support body 52, is disposed coaxially with the cylindrical support body 52, and is rotatably connected to the support body 52. A shaft 64 is fixed on the same axis as the cylindrical portion 61, and the shaft 64 rotates as the cylindrical portion 61 rotates.
The blades 62 have a function of receiving a wind blowing in the lateral direction toward the windmill 25 and generating lift, and generate torque in the rotation direction of the rotating body 51 by this lift. The shape of the wing 62 is such that one surface is gently curved from the leading edge to the trailing edge, and the other surface is substantially planar from the leading edge to the trailing edge. Further, the front edge portion of the wing 62 is rounded, and the rear edge portion has a sharp shape. The wind turbine 25 according to the present embodiment includes three blades 62 having such a shape. By arranging the three blades 62 around the cylindrical portion 61 at equal intervals, the wind turbine 25 can be viewed from either direction. With regard to the blowing wind, the rotating body 51 can be rotationally driven by accurately capturing this. As the material of the wing 62, it is preferable to use a lightweight and high strength material such as fiber reinforced plastic or carbon fiber.

The wing support arm 63 connects and fixes the wing 62 described above to the cylindrical portion 61. In the present embodiment, one wing 62 is supported by two wing support arms at two locations, upper and lower.
As a material of the wing support arm 63, it is preferable to use a lightweight and highly durable material such as aluminum or carbon fiber.

A motor 65 for assisting driving of the windmill 25 is attached to the shaft 64 of the windmill 25. The motor 65 is connected to a main body 65A attached to the float 2, a rotary shaft 65B protruding upward from the main body 65A, a rotary shaft 65B, and a pulley 64A attached to the shaft 64 and a belt 68. Pulley 65C. By driving the motor 65, the shaft 64 can be rotated via the pulley 65C, the belt 68, and the pulley 64A.
The pulley 64A provided on the shaft 64 is provided with a one-way clutch (not shown). When the shaft 64 is rotating beyond the rotational speed on the motor 65 side, the pulley 64A is idled. It is configured.
As shown in FIG. 6, the motor 65 is connected to the control device 70. Supply of electric power to the motor 65 is preferably performed by an electric power source (not shown) installed in the float 2. In addition, the structure which supplies electric power using a conducting wire from the electric power source installed in the exterior of the ultrafine bubble generator 1 may be sufficient.
The diameter ratio between the pulley 64A and the pulley 65C can be changed.

As shown in FIG. 1, a rotation sensor 67 is attached to the shaft 64 of the windmill 25. As shown in FIG. 6, the rotation sensor 67 is connected to the control device 70.
Further, as shown in FIG. 6, the input means 69 is connected to the control device 70. The input unit 69 is a unit for an operator to input information to the control device 70. In the present embodiment, the input unit 69 is a unit for inputting whether or not to perform auxiliary driving. The input means 6 is composed of, for example, a changeover switch and a keyboard.
In the control device 70, a rotation sensor 67 and input means 69 are connected on the input side, and a motor 65 is connected on the output side. The control device 70 controls the rotational speed of the motor 65 based on the rotation of the shaft 64 when auxiliary driving is performed.

Next, a method for generating ultrafine bubbles by the ultrafine bubble generator 1 using wind power will be described.
First, when wind is blowing, the windmill 25 is rotated by wind power. The wind energy is converted into mechanical energy by the windmill 25 and rotates the shaft 64. The force for rotating the shaft 64 is transmitted to the compression device 23, and the compression device 23 pumps the gas. The gas pressure-fed from the compression device 23 is sent to the bubble generating medium inner passage 41. The gas sent to the bubble generating medium inner passage 41 passes through fine holes 24A having a diameter of several μm to several tens of μm provided in the bubble generating medium 24 to become ultrafine bubbles and is released into the liquid.
On the other hand, the force for rotating the shaft 64 is transmitted to the pumping pump 22, and the pumping pump 22 pumps water from the suction side pipe 31 into the ultrafine bubble generating device 1. At this time, since the suction port 31A is disposed at a depth of 0.5 to 2 m from the water surface, a pump with a low head and a large capacity can be adopted as the pumping pump 22.

The water introduced into the suction side pipe 31 is introduced into the passage 21. Air is released into the water in the passage 21 through fine holes 24A having a diameter of several μm to several tens of μm provided in the bubble generating medium 24. The released air is dissolved or coexists in water as ultrafine bubbles. Although the head pressure is applied to the water in the passage 21, since the head pressure is low, the bubbles on the surface of the bubble generating medium 24 cannot be torn and refined. However, since air is discharged through the fine holes 24A having a diameter of several μm to several tens of μm, the air coexists in water as dissolved or ultrafine bubbles.
The ultrafine bubbles released into the water are separated from the surface by the flow of the surrounding liquid (flow in the direction of the arrow in FIG. 2) at the moment when they are released onto the surface of the bubble generating medium 24. The ultrafine bubbles have a small diameter and a small surface area compared to the volume, so that buoyancy does not work and the microbubbles easily move downward. For this reason, there is little ratio discharge | released from the water surface in the channel | path 21, and it sends to the discharge side piping 32 with a high concentration. The water in which the gas is dissolved or the water in which the gas coexists as the ultrafine bubbles is discharged from the discharge port 32A into the water through the discharge side pipe 32. Since the discharge port 32A of the discharge side pipe 32 is deeper than the suction port 31A, when the suction side pipe 31, the passage 21, and the discharge side pipe 32 are filled with liquid, the siphon principle works and the pumping pump 22 The water in which the gas is dissolved or the water in which the gas is allowed to coexist as ultrafine bubbles can be discharged from the discharge port 32A into the water only by the lifting pressure due to.

When the wind is not blowing, the drive of the motor 65 is controlled by the control device 70, and the windmill 25 is rotated by the motor 65.
Next, drive control of the motor 65 by the control device 70 will be described with reference to FIG.
First, the control device 70 determines whether or not an input is made as to whether or not auxiliary driving is to be performed (step S5). In step S5, when there is no input for performing auxiliary driving, the control is terminated. In step S5, if there is an input for performing auxiliary driving, it is determined whether or not the rotation speed detected by the rotation sensor 67 is a predetermined value or less (step S10). If the rotation speed detected by the rotation sensor 67 is less than or equal to a predetermined value, it is determined that no wind is blowing, and the rotation speed of the motor 65 is calculated so that the rotation speed of the windmill 25 becomes the predetermined rotation speed (step). S20). Then, the motor 65 is driven at the rotational speed calculated in step S20 (step S30), and the process proceeds to step S5.
When the rotation speed detected by the rotation sensor 67 is larger than the predetermined value, the driving of the motor 65 is stopped (step S40), and the process proceeds to step S5.

  With this configuration, the rotational speed of the shaft 64 is constant by the motor 65 even when the wind is not blowing. Thereby, the force which drives the pumping pump 22 and the compression apparatus 23 becomes substantially constant, and the water in which the ultrafine bubbles coexist or the gas is dissolved can be discharged.

  When the ultrafine bubble generating device 1 is not used, air is supplied to the closed system including the passage 21, the suction side pipe 31, and the discharge side pipe 32 by opening the vent hole 32 </ b> B of the discharge side pipe 32. Can do. Accordingly, as shown in FIG. 8, the water filled in the passage 21, the suction side pipe 31, and the discharge side pipe 32 is lowered to the level of the surrounding water surface by the atmospheric pressure. Since the passage 21 is disposed above the water surface, no water remains in the passage 21. For this reason, the maintenance of the passage 21 is facilitated.

As described above, the passage 21 through which water, which is liquid, the pumping pump 22 for pumping water, the compression device 23 for pumping gas to the passage 21, and the gas pumped by the compression device 23 are ultrafine. The bubble generating medium 1 includes a bubble generating medium 24 that discharges to the liquid in the passage 21 as bubbles, and the bubble generating medium 24 is formed of a carbon-based porous material. The wind turbine 25 includes a rotating body 51 and a support body 52. The rotating body 51 includes a cylindrical portion 61 and blades 62 for receiving wind. And a blade support arm 63 that supports the blade 62 and fixes the blade 62 to the cylindrical portion 61, and the support body 52 is a column having a circular cross section that is coaxially connected to the cylindrical portion 61 at a predetermined interval.
By comprising in this way, an ultrafine bubble with a small particle size can be generated using wind force. By using wind power that is renewable energy, when the wind is blowing, the ultrafine bubble generator 1 can be operated without receiving external power supply, such as an electric wire that supplies power from the outside. The cost can be saved.

In addition, a motor 65 for assisting driving of the windmill 25 is provided when there is no wind.
With this configuration, the ultrafine bubble generating device 1 can be operated by driving the motor 65 even when there is no wind.

In addition, a rotation sensor 67 for detecting the rotation speed of the windmill 25 is provided, and the rotation sensor 67 and the motor 65 are connected to the control device 70. When the rotation speed is equal to or less than a certain value, The motor 65 is controlled to be driven.
By configuring in this way, even when there is no wind or when the air volume is small, it is possible to drive the ultrafine bubble generating device 1 steadily by driving the motor 65 and the gas is dissolved, or A constant amount of liquid coexisting as ultrafine bubbles can always be supplied.

In addition, a suction port 31A is provided on the upstream side of the flow of liquid from the passage 21, and the suction port 31A is installed within 0.5m to 2m from the lower surface of the float 2 where the windmill 25 is installed.
With this configuration, the suction port 31A is located near the water surface, so that liquid can be pumped even if the lift pressure is small.

Moreover, it has the discharge port 32A which discharges the liquid containing an ultrafine bubble, and the discharge port 32A is arrange | positioned in the position lower than the suction port 31A.
With this configuration, since the discharge port 32A is located at a position lower than the suction port 31A, it becomes easy to prevent the gas from dissolving or coexisting as ultrafine bubbles from entering the suction port 31A again. It is possible to efficiently produce a liquid that dissolves or coexists as ultrafine bubbles.

1 Ultra Fine Bubble Generator 21 Passage 22 Pumping Pump (Pump)
23 Compressor 24 Bubble Generation Medium 25 Windmill 26 Tube 41 Passage in Bubble Generation Medium

Claims (5)

A passage for flowing liquid, a pump for pumping liquid, a compression device for pumping gas to the passage, and bubble generation for discharging the gas pumped by the compression device to the liquid in the passage as ultrafine bubbles An ultrafine bubble generator comprising a medium,
The bubble generating medium is formed of a carbon-based porous material,
A windmill that supplies power for driving the pump and the compression device;
The windmill includes a rotating body and a support body,
The rotating body has a cylindrical portion, a wing for receiving wind, and a wing support arm that supports the wing and fixes the wing to the cylindrical portion,
The support is a column having a circular cross section connected coaxially with the cylindrical portion at a predetermined interval.
An ultrafine bubble generator characterized by that. When no wind is provided, a motor for assisting driving the windmill is provided.
The ultrafine bubble generating apparatus according to claim 1. A rotation sensor for detecting a rotation speed of the windmill is provided, and the rotation sensor and the motor are connected to a control device, and the control device drives the motor when the rotation speed is a predetermined value or less. To control,
The ultrafine bubble generating device according to claim 2. A suction port is provided on the upstream side of the liquid flow from the passage, and the suction port is installed within 0.5 m to 2 m from the lower surface of the installation base on which the windmill is installed.
The ultrafine bubble generating device according to any one of claims 1 to 3. A discharge port for discharging a liquid containing ultrafine bubbles is provided on the downstream side of the flow of liquid from the passage, and the discharge port is disposed at a position lower than the suction port.
The ultrafine bubble generating device according to claim 4.

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