WO2009063957A1

WO2009063957A1 - Fine bubble diffusing apparatus and method

Info

Publication number: WO2009063957A1
Application number: PCT/JP2008/070727
Authority: WO
Inventors: Makoto Minamidate
Original assignee: Ebisu-Science, Co., Ltd.
Priority date: 2007-11-12
Filing date: 2008-11-07
Publication date: 2009-05-22
Also published as: CN101918328A; JP4374069B2; JPWO2009063957A1

Abstract

This aims to provide a fine bubble diffusing apparatus (1) comprising a bubble mixing bath (2) arranged over or near the water surface of an object water area, in which fine bubbles are diffused, a water supply pipe (3) extending from the bath (2) toward the bottom of the object water area, a water feed pipe (4) protruding downward from the bath (2) and having a plurality of water feed ports (5) opened in its side face, an underwater pump (6) connected to the water feed pipe (4), and a device (10) for producing fine bubbles in the water of the bath (2). When the pump (6) is run, an upward center water flow is established in the center portion of the water feed pipe (4), and the water is sucked from the water feed ports (5) of the water feed pipe (4) by the Venturi effect accompanying that center water flow, so that the water rises in the water feed pipe (4) and is pumped up into the bath (2). As a result, the water level of the bath (2) becomes higher than the water level of the object water area thereby to establish a water flow directed from the bath (2) through the water supply pipe (3) toward the bottom of the object water area, so that the bubble-mixed water is carried on the water flow toward the bottom of the water area thereby to diffuse the fine bubbles. Thus, the apparatus and method can diffuse the fine bubbles all over the object water area by the relatively low power.

Description

Technical description Microbubble diffusion device and method

The present invention relates to an apparatus and a method for diffusing fine bubbles from the bottom of a target water area such as a river, a pond, a swamp, or a sea sword.

¾ Technical completion

The fine bubble generator is known as a device for purifying water by increasing the amount of dissolved oxygen by mixing fine bubbles in tap water or river water, for example. The fine bubbles are, for example, bubbles having a diameter of 1 mm or less, a large specific surface area, a long residence time in water, and excellent diffusibility in water. Taking advantage of the properties of these microbubbles, it has the potential to be applied in a wide range of areas, including purification of domestic water and river water, and fishery-related matters.

As a device for generating such fine bubbles, the present inventors rotate a rotating disk at a high speed in a liquid to generate a high-speed liquid flow and a negative pressure state in the liquid. A device for generating a fine bubble in the liquid was proposed by making a bubble mixed liquid flow into the liquid and applying the bubble mixed liquid flow to a mesh member to subdivide the bubbles (see Patent Document 1). According to this apparatus, fine bubbles having a long residence time in the liquid can be stably generated.

The following methods can be considered as a method of diffusing the fine bubbles generated in this way to the entire target water area of a relatively wide depth of several meters or more such as rivers, swamps, ponds, and sea bream. .

(1) The rotating disk of the fine bubble generator of Patent Document 1 is positioned near the bottom of the target water area, and the disk is rotated to generate fine bubbles and mixed in water.

(2) A fine bubble is generated in a tank installed on land to produce a fine bubble mixture, and this fine bubble mixture is passed through a water pipe that extends to the vicinity of the bottom of the target water area. Send it in with an amplifier.

However, in the proposal (1) above, when the water depth of the target water area is as deep as several meters or more, it is necessary to lengthen the rotation axis of the rotating disk, and it is difficult to rotate such a long rotation axis at high speed. It is. In the above plan (2), when the fine bubble mixed solution passes through the impeller of the pump, a plurality of bubbles are combined, and the characteristics of the fine bubbles cannot be exhibited.

On the other hand, an apparatus has also been proposed in which pressurized gas is sent into a liquid through a porous material such as ceramic to generate fine bubbles. However, in the case of this device, if a porous body is installed near the bottom of the water, it is necessary to send the pressurized gas at a pressure higher than the water pressure, which requires a high-output compressor, etc., which consumes a lot of energy. Larger equipment.

Patent Document 1: Patent No. 3 9 5 8 3 4 6 Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide an apparatus and a method capable of diffusing fine bubbles over the entire target water area with relatively small power.

In the fine bubble diffusing device of the present invention, a bubble mixing tank disposed on or near the surface of the target water area where fine bubbles are diffused, a water supply pipe extending from the tank toward the bottom of the target water area, and the tank Water supply means, and means for mixing fine bubbles into the water in the tank, the water level of the tank being higher than the water level of the target water area, and the target water area from the tank through the water pipe A water flow toward the bottom of the water is formed, and it is placed on this water flow and the bubble mixed water is sent toward the bottom of the water area to diffuse the fine bubbles.

Water is supplied to the tank by means of water supply, and the water level in the tank is made higher than the water level in the target water area to give potential energy, so that the water in the tank passes through the water pipe toward the bottom of the target water area (downward). It begins to flow. Then, by placing the fine bubbles mixed with water in the tank on this flow, the fine bubbles are moved to the vicinity of the bottom of the target water area. Spread from here into the target water area. According to this apparatus, it is possible to form a water flow that flows from the upper side to the lower side of the target water area with relatively small power, and to diffuse near the bottom of the target water area while keeping the diameter of the fine bubbles small. In particular, compared with the case where bubble mixed water is pumped with a pump, the inside of the target water area can be diffused while maintaining the diameter of the fine bubbles with less power.

In addition, the microbubble here means a diameter having a diameter of several hundreds or several tens of μm or less and a slow rising speed in water. Of course, the term “near the bottom of the target water area” as used herein means the vicinity of the bottom of the water area where the bubbles are to diffuse (for example, the area where the bubbles are to diffuse in the sea at a depth of 5 Om to the sea floor). If the depth is 2 Om or more, it means 20 m), not the physical bottom of the body of water (bottom soil such as the seabed or lake bottom). In addition, since the water discharged from the lower end of the water pipe sinks down to some extent due to inertia, the length of the water pipe may be shorter than the bottom depth of the target water area.

In the present invention, the water supply means has a water supply pipe projecting downward from the tank, and a submersible pump connected to the water supply pipe, and the pump supplies water in the target water area from the water supply pipe. It can be pumped into the tank.

In this case, the tank, water pipe, and water pipe can be assembled as a single unit. If a moving function is attached to this unit, for example, fine bubbles can be automatically diffused while moving the unit over a wide target water area such as a river or lake. Furthermore, in the present invention, the water supply pipe and the water supply pipe are arranged close to each other, and the horizontal cross-sectional shape of the tank is a shape connecting the horizontal cross sections of the water supply pipe and the water supply pipe. preferable.

If there is an excess part in the tank, the water may stagnate there, or turbulent flow may occur and the desired water flow may not be formed, so connect the cross section of the water supply pipe and the water supply pipe to the cross section of the tank. It is preferable that no part other than the part is formed. It is preferable that turbulent flow is not generated even in the water pipe. Here, a turbulent flow is a flow turbulence, vortex, or swirl flow, etc., which is a flow other than a quiet flow along the direction of travel of the flow. When there is a turbulent flow, mixed fine bubbles collide with each other This is because the bubbles that are combined and become larger are likely to float. It is preferable that the water flow as if the fine bubble mixed flow gently sinks in the water pipe without causing the coalescence of the fine bubbles. From this viewpoint, it is preferable that the flow velocity of the water flow in the water pipe is about 0.1 m / sec or less.

In this invention, the some water supply opening is opened in the side surface of the said water supply pipe | tube, and the said submersible pump can be connected to the lower end part of the said water supply pipe | tube. Then, when the submersible pump is operated, the water in the target water area is taken into the pipe from the water supply port on the side of the water supply pipe and pumped up into the bubble mixing tank. In other words, due to the water flow of the submersible pump formed in the water supply pipe, the static pressure in the water supply pipe is lower than the surroundings due to the effect of Berne T, and it passes through the water supply port from the outside of the water supply pipe. Water flows in (bench lily effect). In this case, a water flow with less turbulence and vortices can be formed in the water supply pipe, bubble mixing tank, and water supply pipe, and the bubble mixed water is sent to the bottom of the target water area and diffused on this water flow. Bubbles can be diffused near the bottom of the target water area while keeping the diameter small. A large amount of water can also flow with relatively little power. In addition, by using a submersible pump, the power flow can be reduced by shortening the flow path for water.

In addition, the position of the water supply inlet of the water supply pipe is not limited to the side surface of the water supply pipe as long as the above-described bench lily effect can be generated. In addition, the number of water supply ports is not limited to a plurality.

In another fine bubble diffusing device of the present invention, a bubble mixing tank disposed on or near the surface of the target water area for diffusing the fine bubbles, a water supply pipe extending from the tank toward the bottom of the target water area, Water supply means to the tank, and means for mixing fine bubbles into the water in the tank, the water level of the tank is made higher than the water level of the target water area, and from the tank through the water pipe A micro-bubble diffusing device that forms a water flow toward the bottom of the target water area and sends the bubble mixed water toward the bottom of the water area by being put on the water flow to diffuse micro-bubbles, wherein the water supply means includes the tank A water supply pipe projecting downward from the water supply opening and means for forming an upward central water flow at the center of the water supply pipe. Water in the target water area is taken into the pipe from the water supply port of the water supply pipe, and the water in the pipe is raised and pumped into the tank.

According to the present invention, water in the target water area is taken into the pipe from the water supply port of the water supply pipe due to the bench-lily effect, so that water having a flow rate that is many times the substantial flow rate of the submersible pump can be pumped into the tank. In addition, there will be a flow in which the entire water in the water pipe is lifted as it is. When the water level in the tank rises due to the flow of water in the water supply pipe, the water in the tank flows toward the water pipe and goes down through the pipe. By mixing microbubbles into this flow, water mixed with microbubbles can be sent to the bottom of the target water area.

In the method of diffusing fine bubbles according to the present invention, a bubble mixing tank is disposed on or near the surface of the target water area where fine bubbles are diffused, and water is supplied to the tank to control the water level in the tank. A water flow from the tank to the vicinity of the bottom of the target water area is formed at a level higher than the water level, and the mixed water is sent to the bottom of the water area and spreads on the water flow.

In another method of diffusing fine bubbles of the present invention, a bubble mixing tank is disposed on or near the surface of the target water area where fine bubbles are diffused, and the fine bubbles are mixed in water in the tank, and water is added to the tank. The water level in the tank is made higher than the water level in the target water area to form a water flow from the tank toward the bottom of the target water area, and the bubble mixed water is placed near the bottom of the water area on the water flow. A method of diffusing fine bubbles, which is sent to and diffused, comprising: a water supply pipe projecting downward from the tank and having a water supply opening; and means for forming an upward central water flow at the center of the water supply pipe. Due to the venturi effect associated with the central water flow, water in the target water area is taken into the pipe from the water supply port of the water supply pipe, and the water supply pipe is raised and pumped into the tank. The invention's effect

As is clear from the above description, according to the present invention, water is supplied to the tank by the water supply means, and the water level in the tank is made higher than the water level of the target water area to give the potential energy, so that the water pipe is connected from the tank. It forms a water flow that passes through the target water area. To tank Since water can be supplied with relatively small power, fine bubbles can be diffused from the bottom of the target water area with small power. Brief Description of Drawings

FIG. 1 is a diagram schematically illustrating a microbubble generator according to an embodiment of the present invention.

FIG. 2 is a plan view of the microbubble generator of FIG.

Figure 3 is a photograph showing a prototype of a microbubble diffusion device.

Fig. 4 is a photograph explaining the state of fine bubble diffusion.

Figure 5 is a photograph explaining the state of microbubble diffusion.

Fig. 6 is a photograph explaining the state of microbubble diffusion.

Figure 7 is a photograph explaining the state of microbubble diffusion.

Fig. 8 is a photograph explaining the state of fine bubble diffusion.

Fig. 9 is a photograph explaining the state of fine bubble diffusion.

Fig. 10 is a photograph showing a state where the water supply port of the water supply pipe is closed.

Fig. 11 is a photograph explaining the diffusion state of fine bubbles when the water supply port of the water supply pipe is closed.

Fig. 12 is a photograph explaining the diffusion state of fine bubbles when the water supply port of the water supply pipe is closed.

FIG. 13 is a diagram for explaining another example of the fine bubble diffusing apparatus according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram schematically illustrating a microbubble generator according to an embodiment of the present invention.

FIG. 2 is a plan view of the microbubble generator of FIG.

FIG. 3 is a diagram for explaining the structure near the lower end of the water supply pipe of the microbubble generator of FIG. The

As shown in FIG. 1, the fine bubble generating device 1 has a bubble mixing tank 2 in which water in a target water area where fine bubbles are diffused is stored. The bubble mixing tank 2 is disposed on or near the water surface of the opposite water area, and the planar shape is a bowl-shaped shape as shown in FIG. 2 as described later.

On the bottom surface of the bubble mixing tank 2, a water supply pipe 3 extending downward is provided. The length of the water pipe 3 is the length from the bottom surface of the tank 2 to the vicinity of the bottom surface of the target water area. Further, a water supply pipe 4 extending downward is provided alongside the water supply pipe 3 on the bottom surface of the bubble mixing tank 2. The length of the water supply pipe 4 is shorter than that of the water supply pipe 3. As shown in Fig. 2, the water pipe 3 and the water supply pipe 4 are arranged in close proximity to each other, and the horizontal cross-sectional shape of the tank 2 is a vertical shape connecting the horizontal cross sections of the water supply pipe 3 and the water supply pipe 4 It is. In Figs. 1 and 2, there is a slight gap between the water supply pipe 3 and the water supply pipe 4, but these may be in contact.

A plurality of water supply ports 5 are opened on the side surface of the water supply pipe 4. As shown in FIG. 3, the lower end of the water supply pipe 4 is closed by a bottom plate 4a, and an opening 4b is opened at the center of the bottom plate 4a. A submersible pump 6 is attached to the bottom plate 4a (specific specifications of the submersible pump will be described in an example described later). The submersible pump 6 has a box-shaped housing 6 a that houses a motor. A water supply port 6 b is formed on the side surface of the housing 6 a, and a discharge port 6 c that protrudes upward is formed on the upper surface. It is formed. The submersible pump 6 is attached to the bottom plate 4 a of the water supply pipe 4 via the packing 7, and the discharge port 6 c projects into the water supply pipe 4 from the opening 4 b of the bottom plate 4 a.

When the submersible pump 6 is operated, water flows upward from the lower end of the water supply pipe 4 at the center of the water supply pipe 4 as shown in FIG. Due to this water flow, the static pressure in the water supply pipe 4 is lower than the surroundings due to the effect of Bernoulli's theorem, and water flows from the outside of the water supply pipe 4 through the water supply port 5 (bench lily effect). By such an action, the water in the target water area is taken into (sucked) from the water supply port 5 on the side surface of the water supply pipe 4, and rises in the pipe 4 and is pumped into the tank 2. Submersible pump 6 It is necessary to adjust the relationship between the capacity and the diameter and length of the water supply pipe 4 and the size and position of the water supply port 5 so that such intake (suction) occurs. An example of the relationship Will be described later in the Examples section.

The tank 2 is provided with a fine bubble generator 10, which generates fine bubbles in the liquid in the tank 2, thereby forming bubble mixed water. For example, the above-mentioned Japanese Patent No. 3 95 8 3 4 6 can be used as the microbubble generator.

Hereinafter, a specific example of this microbubble generator will be described.

The fine bubble generating device includes a motor, a rotating shaft rotated by the motor, a rotating disk attached to a tip of the rotating shaft, a cylinder having a gas introduction port surrounding the outer periphery of the rotating shaft with a space, A flange that is attached to the tip of the cylinder and surrounds the outer periphery of the disk with a gap; and a cylindrical mesh member that is provided so as to extend from the periphery of the flange.

By rotating the disk in the liquid, the liquid on the lower surface of the disk is caused to flow outward by centrifugal force. By this liquid flow, the gas in the cylinder is sucked out from the gap between the disk and the flange, and mixed with the liquid to mix the bubbles. A liquid flow is created, and bubbles are subdivided while passing this liquid flow through a mesh member.

The mesh member is a mesh net, and the opening size thereof is 50 to 500 mesh, preferably 100 to 400 mesh. The mesh member is a plurality of mesh nets stacked.

A specific structure of the fine bubble generator will be described with reference to the drawings.

4A and 4B are diagrams for explaining an example of the configuration of the microbubble generator, in which FIG. 4A is a cross-sectional view and FIG. 4B is a partial cross-sectional view.

The microbubble generator 10 includes a motor 12, a rotating shaft 14 rotated by the motor 12, and a rotating disk 15 attached to the tip of the rotating shaft 14. Further, a cylindrical body 16 that surrounds the outer periphery of the rotating shaft 14 with a space, and a cylindrical mesh member 2 that is provided at the tip of the cylindrical body 16 and surrounds the outer peripheral edge of the rotating disk 15 with a gap. 0.

The rotating shaft 1 4 is connected to the output shaft 1 2 a of the motor 1 2 through the coupling 1 3. It is tied. A rotating disk 15 is attached to the tip of the rotating shaft 14. The rotating disk 15 is a thin conical member that tapers toward the tip. The surface of the disk 15 on the side of the motor 12 is a flat surface, and the peripheral edge is machined to be sharp. The rotating disk 15 can be attached to the end of the rotating shaft 14 by an adhesive or the like.

Between the motor 12 and the rotating disk 15, a cylindrical body 16 that surrounds the rotating shaft 14 with a space is attached. The cylindrical body 16 is a member having a shaft hole 16 a on the same axis as the motor rotating shaft 14, a base portion 17 covering the motor 12, a central portion 18 extending along the rotating shaft 14, It consists of a flange 19 that projects outward. Each part can be an assembly of parts made separately, or each part can be made in one piece.

A gas inlet 1 8a is opened in the central portion 1 8 near the base (near the motor 1 2). The outside of the cylindrical body 16 communicates with the inside of the shaft hole 16 a through the gas introduction port 18 a. The front flange portion 19 is a short cylindrical portion, and is fitted and fixed to the front end of the central portion 18. The front end surface 19 a of the flange portion 19 is inclined in a conical shape so that the center is recessed. A space is formed between the front end surface 19 a and the rotating disk 15. Further, as shown in FIG. 4 (B), a gap d is opened between the outer peripheral edge of the front end of the flange portion 19 and the outer peripheral edge of the rotating disk 15. The width of the gap d is preferably l mm or less with a small machine. In order to reduce the size of the bubbles, it is preferable that the gap d is small. For large machines, it is preferably about 5 to 1 Om m or less and as small as possible.

Various types of gas sources can be connected to the gas inlet port 1 8 a. Around the flange portion 1 9, the cylindrical mesh member 2 0 force extends beyond the flange portion 1 9. Is attached. The cylindrical mesh member 20 is composed of, for example, cylindrical mesh nets 21a, 21b, 22c stacked in three layers. The preferred opening size of each mesh net is 50-500 mesh, more preferably

0 0 to 4 0 0 Next, the operation of this fine bubble generator will be described.

FIG. 5 is a diagram for explaining the usage state of the microbubble generator.

First, the rotating disk 15 of the apparatus 10 is held so that it is at the bottom, and the rotating disk 15 is submerged in water. At this time, the air introduction port 18 a of the cylindrical body 16 is on the water surface. Since a small gap d is opened between the rotating disk 15 and the flange portion 19 of the cylinder 1, liquid enters the shaft hole 16 a of the cylinder 16 from the gap d. Then, the motor 12 is driven to rotate the rotating shaft 14, and the rotating disk 15 is rotated. Then, due to the centrifugal force of the rotating disk 15, the liquid existing in the vicinity of the disk 15 flows at high speed outward. As a result, the space between the disk 15 and the flange tip surface 19 a becomes negative pressure, and if it is further rotated, the shaft hole 16 a 1 seems to have no water. As a result, air is continuously drawn into the cylindrical shaft hole 16 a from the air inlet port 18 a of the cylindrical body 16.

The air drawn into the shaft hole 16 a flows outward from a gap d between the rotating disk 15 and the flange portion 19. At this time, air is mixed with the high-speed liquid flow, and a bubble mixed liquid flow is formed. This bubble mixed liquid flow passes through the member while hitting the mesh member 20 arranged around the flange portion 19. At this time, the bubble mixed liquid flow hits the mesh member 20 at a considerably high speed due to the high-speed rotation of the rotating disk 15. Since the mesh member 20 is made of the three-layer mesh net 21 as described above, bubbles are subdivided each time they pass from the inner mesh net 21a to the outer mesh net 21c. Ultimately, it becomes very fine bubbles. Since the rotating disk 15 rotates at a high speed, the bubble mixed liquid flow generated by the centrifugal force also rotates in a spiral at a considerably high speed, but the speed is alleviated each time it hits the mesh member 20. For this reason, turbulence and turbulence of the liquid such as the liquid surface rising do not occur, and fine bubbles are diffused uniformly from the mesh member 20 in all directions.

Next, the operation of the fine bubble diffusing apparatus 1 will be described with reference to FIG.

Here, an example in which tank 2 is levitated and used in the target water area will be described. When tank 2 is levitated into the target water area, it enters the pipe from the lower end of water pipe 3 or water inlet 5 of water pipe 4. Water in the target water area enters and water is stored in tank 2 as well. Then, when the submersible pump 6 attached to the water supply pipe 4 is operated, the water in the target water area is taken into the pipe from the water supply port 5 on the side surface of the water supply pipe 4 as described above, and rises in the pipe to raise the tank 2 Pumped inside. As a result, the water level H 1 in the tank 2 rises and becomes higher than the water level H 2 in the target water area. If the submersible pump 6 continues to operate, more water will be pumped into the tank 2, but the water will not accumulate further in the tank 2, and the water will flow through the tank due to the potential energy of the water in the tank 2. It flows toward the water pipe 3 and goes downward through the pipe 3. At this time, there is almost no space other than the water supply pipe 3 and the water supply pipe 4 in the plane shape of the tank 2, so that the water in the tank does not stagnate and turbulence does not occur. Then, a water flow from the water supply pipe 4 to the tank 2 and the water supply pipe 3 is formed as shown by the arrow in FIG.

The technical significance of water intake from this submersible pump and water supply port is as follows. First, because there is almost no turbulence or vortex in the flow of the supplied water (as if the water in the water supply pipe It feels as if it is lifted up without being disturbed) Water is hardly disturbed even in the bubble mixing tank, and the water in which the fine bubbles are mixed by the fine bubble mixing means keeps the diameter of the fine bubbles small. It is carried through the water pipe toward the bottom of the water.

Second, it can supply many times the amount of water delivered by the submersible pump, so it can process a relatively large amount of water with low power and small equipment costs (examples and data will be described later).

Then, when microbubbles are generated in the water in the tank 2 by the microbubble generator 10, the water in which the microbubbles are mixed is sent to the lower side through the water pipe 3 along this water flow, It diffuses from the bottom opening to the bottom of the target water area.

In addition, tank 2 can be provided with a levitation means so that tank 2 is levitated into the target water area. Furthermore, if a moving means is provided in such a tank 2 so that it can move within the target water area, the fine bubbles can be automatically diffused into the wide target water area. In addition, an attached water pipe that extends along the bottom of the water may be attached to the end of the water pipe 3. Les. If a water supply port is provided on the side surface of the water supply tube, fine bubbles can be generated from the water supply port.

The volume of tank 2, the dimensions of water supply pipe 3 and water supply pipe 4, and the performance of pump 6 are appropriately selected according to the size of the target water area. Example

Next, we will describe an experiment in which microbubbles were actually diffused using the prototype of the microbubble diffusion device shown in Fig. 1.

Figure 6 is a photograph showing a prototype of a microbubble diffusion device.

The dimensions and specifications of each part of this fine bubble diffusing device are shown below.

Bubble mixing tank 2 (Stainless steel part at the top of the photo): Length 3 5 Omm, depth 2 30 mm, volume 20 liters,

Water pipe 3 (transparent acrylic tube with red tape on the right side of the photo): diameter 200 mm, length 8 70 mm,

Water supply pipe 4 (gray PVC tube on the left side of the photo): Diameter 120 mm, length 50 mm:

A plurality of water supply ports 5 are opened on the side surface of the water supply pipe 4,

Submersible pump 6 (black pump attached to the lower end of the water supply pipe 4) (Rio Pa ヮ ichi head R io 3 1 00 (trade name, manufactured by Kamihata Fish Co., Ltd.): Specifications, maximum outflow amount: 5 5 liters Zm in (50 Hz), 5 7 liters / min (60 Hz), maximum lift: 29 cm (50 Hz), 29 cm (60 Hz), voltage: 100

V, power consumption: 5 5W (5 0 Hz), 6 4 W (6 0 Hz). The diameter of the discharge port is 22 mm and the length is 22 mm.

As the fine bubble generator 10, the above-mentioned one was used.

A state where fine bubbles are diffused using the apparatus of this example will be described.

7 to 9 are photographs for explaining the state of fine bubble diffusion.

Water tank with a diameter of 40 O mm, a height of 100 O O, and a capacity of 1 15 liters as the target water area for diffusing fine bubbles (in each photo, a transparent acrylic tank on the outside) Prepared.

First, 115 liters of water was stored in the aquarium, and the microbubble diffuser 1 was lifted with a hoist and placed in the aquarium from above the aquarium. At this time, as described above, water entered from the opening end of the water supply pipe 3 and the water supply port 5 of the water supply pipe 4, and water was stored in the tank 2. Next, the submersible pump 6 was operated. Then, as described above, water is taken in from the water supply port 5 of the water supply pipe 4 and pumped into the tank 2, and as shown in Fig. 7 (A), the water level of the tank 2 內 is about 1 O mm from the water level of the water tank. Degree (d in Figure 1) became high. A fine bubble generator 10 was installed in the tank 2 to generate fine bubbles. Immediately after the generation, the fine bubbles still remain in the tank 2 as shown in FIG. 7 (B). After that, when the submerged pump 6 was operated and microbubbles were continuously generated, the microbubbles started to move down the water pipe 3 內 as shown in Fig. 8 (A). Then, as shown in FIG. 8 (B), the fine bubbles reached the lower end of the water supply pipe 3, and as shown in FIG. 9 (A), the vicinity of the lower end of the water supply pipe 3 became cloudy white. Thereafter, as shown in FIG. 9 (B), the water was discharged from the lower end of the water pipe 3 into the water tank and was diffused while rising in the water tank.

Other examples of dimensions and performance of each part of the fine bubble diffusing device are shown below.

Water pipe 3: diameter 20 O mm, length 1.8 m,

Water supply pipe 4: diameter 12 O mm, length 0.5 m,

Water inlet 5: Diameter 15 mm,

Position and number of water supply ports 5: 2 2 units installed at a position near 0.3 m from the upper end of the water supply pipe.

Settling speed of the bubble mixed water in the water pipe 3: about 7 c mZ sec;

As a comparison, the same experiment as described above was performed by closing the water supply port 5 of the fine bubble diffusing apparatus of this example.

Figures 11 and 12 are photographs that explain the diffusion of fine bubbles when the water supply port of the water supply pipe is closed.

As shown in the picture in Fig. 10, the supply of water pipe 4 (gray PVC tube on the right side of the figure) Water mouth 5 was closed with gummed tape. Then, as in Fig. 1, the device 1 was placed in the target water area, and water was stored in the tank 2, the water supply pipe 3, and the water supply pipe 4 內. Thereafter, the submersible pump 6 attached to the water supply pipe 4 was operated. Then, as shown in FIG. 11A, the fine bubble generating device 10 was installed in the tank 2, and the device 10 was operated for several seconds to generate fine bubbles. In Fig. 1 1 A, fine bubbles are generated that appear white and cloudy below tank 2 (the stainless steel part at the top of the photo).

Figure 1 1 shows a picture taken about 30 seconds after the generation of fine bubbles. As shown in the photograph, the generated microbubbles stay in the water pipe 3 almost without descending. Furthermore, Fig. 12 is a photograph of a state in which approximately 10 seconds have elapsed from the state of Fig. 11B. The generated microbubbles are slightly lowered from the state shown in Fig. 11A. As a result of measuring the movement of white turbid water with bubbles by visual observation and convex, the moving speed was about 0.7 cm / sec. In addition, since the rising speed of the bubble was slow, it was ignored. This value is about 1/10 when the water supply port 5 of the water supply pipe 4 is closed. In other words, by providing the water supply pipe 5 with the water supply port 5, a flow rate of about 10 times that obtained without the water supply port 5 can be obtained.

However, when the water supply port 5 of the water supply pipe 4 is blocked, the flow rate of the water flowing through the water supply pipe 3 is substantially due to the capacity of the pump 6 alone. In this case, since the settling speed of the bubbles in the water supply pipe 3 is about 0.7 cmZsec, when converted to a flow rate, it becomes about 13.2 liters min. This value is about 1 Z 4 of the power tag value (5.5 liters Z m i n) of the maximum flow rate of the pump 6 described above. The reason for this difference is unknown. However, even if compared with the maximum flow rate of the catalog value, the flow rate in the case of the bench lily effect is 2.5 times, and the effect of the present invention was confirmed.

FIG. 13 is a diagram for explaining another example of the fine bubble diffusing apparatus according to the embodiment of the present invention.

In this fine bubble diffusing device, a pump 6 A is attached to a tank 2 on the water surface. In this example, the suction pipe 6b of the pump 6A extends from the housing 6a of the pump 6A into the water. Also, the discharge pipe 6c is connected to the bottom plate 4a of the water supply pipe 4 from the housing 6a. It extends to the hole 4b opened in the hole and protrudes from the hole 4b to the water supply pipe 4 內. The periphery of the hole 4 b is closed with a seal 8. Also in this example, by operating the pump 6 A, a water flow along the center of the water supply pipe 4 is generated, and water is taken into the same pipe 4 from the water supply port 5 along with this water flow, and inside the water supply pipe 4 Is raised and pumped into tank 3. However, the power consumption increases by the flow path resistance of the suction pipe 6b and the discharge pipe 6c.

Claims

The scope of the claims

1. a bubble mixing tank placed on or near the surface of the target water area where fine bubbles are diffused;

A water pipe extending from the tank toward the bottom of the target water area;

Water supply means to the tank;

Means for mixing fine bubbles into the water in the tank;

With

The water level of the tank is set higher than the water level of the target water area, and a water flow is formed from the tank through the water pipe toward the bottom of the target water area. A fine bubble diffusing device that diffuses fine bubbles by sending them toward the bottom of

The water supply means

A water supply pipe protruding downward from the tank and having a water supply opening opened;

Means for forming an upward central water flow at the center of the water supply pipe, and water in the target water area is taken into the pipe from the water supply port of the water supply pipe due to a bench-lily effect associated with the central water flow. A fine bubble diffusing device characterized by being raised in a pipe and pumped into the tank.

2. The fine bubble diffusing apparatus according to claim 1, wherein the means for forming the central water flow is an underwater pump installed at a lower portion of the water supply pipe.

3. A bubble mixing tank placed on or near the surface of the target water area where fine bubbles are diffused;

A water pipe extending from the tank to near the bottom of the target water area;

Water supply means to the tank;

Means for mixing fine bubbles into the water in the tank;

With

The water level of the tank is set higher than the water level of the target water area, and the water pipe from the tank A micro-bubble diffusing device that forms a water stream passing through the bottom of the target water area through the water stream and sends the bubble-mixed water near the bottom of the water area to diffuse the micro-bubbles.

The water supply means

A water supply pipe projecting downward from the tank and having a plurality of water supply ports opened on a side surface; and a submersible pump attached to a lower end portion of the water supply pipe,

When the submersible pump is operated, the water in the target water area is taken into the pipe from the water supply port on the side surface of the water supply pipe, and the fine bubble diffusing device is raised in the water supply pipe and pumped up to the tank trough .

4. The submersible pump has a water supply port and a discharge port,

The discharge port is located at the center of the bottom of the water supply pipe,

The submersible pump is operated to form an upward central water flow at the center of the water supply pipe, and water in the target water area is taken into the pipe from the water supply port of the water supply pipe due to a bench-lily effect associated with the central water flow. The fine bubble diffusing device according to claim 2 or 3.

5. The water supply pipe and the water supply pipe are juxtaposed in parallel, and the horizontal cross-sectional shape of the tank and the horizontal cross-section of the water supply pipe and the water supply pipe are connected to each other. The fine bubble diffusing apparatus according to any one of to 4.

6. The microbubble diffusion according to any one of claims 1 to 5, wherein turbulent flow does not substantially occur in the water flow from the water supply pipe to the water supply pipe in the bubble mixing tank. apparatus.

7. The means for mixing the fine bubbles into the water in the tank causes the rotating disk to rotate at high speed in the water in the tank to generate a high-speed water flow and a negative pressure state, and gas is generated using this negative pressure. 7. A bubble mixed water stream is formed by being taken into the liquid, and the bubble mixed water stream is applied to a mesh member to subdivide the bubbles and discharge them into the water in the tank tank. The fine bubble diffusing apparatus according to the item.

8. Place a bubble mixing tank on or near the surface of the target water area where fine bubbles diffuse,

Mixing fine bubbles in water in the tank,

Water is supplied to the tank, and the water level in the tank is made higher than the water level of the target water area to form a water flow from the tank to the vicinity of the bottom of the target water area. A method of diffusing fine bubbles that are sent near the bottom of a water body and diffused, wherein the water supply pipe projects downward from the tank and has a water supply opening, and means for forming an upward central water flow at the center of the water supply pipe; Set up

A method of diffusing fine bubbles, characterized in that due to the venturi effect associated with the central water flow, water in the target water area is taken into the pipe from the water supply port of the water supply pipe, and the water supply pipe is raised and pumped to the tank tank.

9. Place a bubble mixing tank on or near the surface of the target water area where fine bubbles diffuse,

Water is supplied to the tank, and the water level in the tank is made higher than the water level of the target water area to form a water flow from the tank to the vicinity of the bottom of the target water area. A method of diffusing fine bubbles that is sent to the vicinity of the bottom of a water area and diffuses, wherein a water supply pipe that protrudes downward from the tank and has a plurality of water supply ports open on a side surface, , And

A method of diffusing fine bubbles, comprising operating the submersible pump, taking water in a target water area from a water supply port on a side surface of the water supply pipe, raising the water supply pipe, and pumping the water into the tank.

In the water flow from the water supply pipe to the water supply pipe in the bubble mixing tank, turbulent flow 10. The method for diffusing fine bubbles according to claim 8 or 9, wherein substantially no generation occurs.