JP2022000303A - Fine bubble formation device - Google Patents

Abstract

To provide a fine bubble formation device which is adapted to various liquids, generates a large amount of fine bubbles, and enables the lift and transportation of fine bubble-containing water.SOLUTION: A device includes: a liquid introduction pipe which introduces a liquid from fluid supply means; a concentric cylindrical injection nozzle which has a center axis in a direction parallel to a longer direction of the liquid introduction pipe, and injects a pressurized liquid; first and second fine bubble formation pipes which each have a larger diameter than the injection nozzle, generate a fine bubble-containing liquid with an injection liquid and gas from a self-priming hole, and are each provided in a circular shape concentric with the injection nozzle; and a gas introduction pipe which is provided between the injection nozzle and the fine bubble formation pipes, and is connected to the self-priming hole. There is arranged, inside the first fine bubble formation pipe, the second fine bubble formation pipe having a length and a diameter which are shorter than those at an angular position where the injection liquid injected from the injection nozzle reaches the first fine bubble formation pipe on the outermost side.SELECTED DRAWING: Figure 2

Description

The present invention relates to a fine bubble forming apparatus that generates fine bubbles by a bubble collapse method.

Organisms that breathe oxygen in water, that is, fish and microorganisms, take in oxygen from the water and act and proliferate, so that dissolved oxygen in the water is consumed. Therefore, it is important to cultivate fish and shellfish that grow by breathing oxygen, or to cultivate algae, green worms, and aerobic microorganisms, and to efficiently supply oxygen to microorganisms in activated sludge. Conventionally, in order to replenish the reduced oxygen, air is blown into the water as a large bubble by an air pump or the like, and the oxygen dissolution efficiency is low.

Also, in the food manufacturing process, fresh cream, butter, bavarois mix, etc. are mixed with bubbles using a whisk or a food processor, and then stored at low temperature or cooled until they become gel-like so that the bubbles do not come out. It was difficult to continuously mass-produce. As described above, the texture is lighter than that of foods containing air or nitrogen gas, and whipped butter or the like can be easily applied to bread even in a cold state. Technology that changes the physical properties and texture by containing air bubbles is an important technology in the food industry.

As a method of supplying oxygen to water, if the bubbles of the blown air are blown in finer, for example, as bubbles of micron unit (diameter), the rising time becomes longer due to the micro-brown movement in water, and as a result, the same amount of blown air is used. By comparison, it has been confirmed that the dissolution rate of oxygen in water is higher than that of air with large bubbles.

Some microbubbles have a bubble diameter such as microbubbles or nanobubbles from millimeter-unit bubbles, and there are various methods for supplying such bubbles into a liquid. The pressure melting method, the shear flow method, the air diffuser method, the bubble disintegration method, the fine needle method, the porous plate method and the like are known.

Fine bubbles are isolated gas masses in a liquid. Taisei et al. Of Tokuyama National College of Technology have a diameter of 10 to 100 μm, Matsumoto et al. Of the University of Tokyo have a diameter of several hundred μm or less, and are about 500 to 1000 μm for reducing friction on ships. Bubbles are called microbubbles, and bubbles in nano units are called nanobubbles, and in the present invention, these are also called microbubbles (according to the book "World of Microbubbles" Morikita Publishing Co., Ltd.). Micro-unit bubbles are used for cleaning objects by the electric charge at the interface of bubbles, efficiently supplying oxygen to water, etc., and are beginning to be considered for use as a food processing method. In addition, nano-unit bubbles are beginning to be used for improving metabolism to living organisms and for medical purposes.

The confirmation of the fine bubbles of the present invention was measured as a modified method of the sewerage test method (first volume) and the transparency measurement method of the Japan Sewerage Association. That is, after closing the tube bottom of the fluoroscopic clock, which is a tube having a length of 50 cm and having a double cross on the bottom of the tube, the test solution is poured into the upper opening, and the bottom of the fluorometer is placed on the upper part. The elapsed time at the time when the double cross at the bottom of the tube was confirmed by looking through the opening was measured as the fluoroscopic time. Using Stokes' law, the approximate number of bubble sizes was calculated from the elapsed time, and the center was estimated to be 200 μm to 20 μm.

It is important for aeration tanks for fish and shellfish culture, microbial culture, and wastewater treatment to constantly supply sufficient oxygen to a large volume of water. Each organism breathes oxygen, is active, and proliferates, and there is no doubt that it will die immediately if there is a shortage of supply and oxygen deficiency.

Therefore, when oxygen is taken in from air, more air must be taken into the water. Further, in terms of oxygen dissolution efficiency, the surface area of bubbles per unit is larger in the state of fine bubbles, the interface with water becomes larger, and the fine bubbles slowly rise in water, so that they are in water. Since it is known that oxygen efficiently dissolves in water, it is required to improve the technique of releasing a large amount of smaller bubbles into a wide area.

In addition, foods that make effective use of foam are not uncommon, and beverages include beer, cafe latte, carbonated beverages, and processed foods include whipped cream, ice cream, air-in chocolate, aerated desserts, whipped butter, and paste products. .. There are various sizes of bubbles, and the method of mixing bubbles is a method of mixing bubbles while breaking the emulsification of the oil-in-water type, and a method of mixing bubbles using the viscosity of the material mix and treating them at low temperature for encapsulation. ing. In these productions, there is a demand for a technique capable of mixing a solution having various properties with a high air content of the product, a large or small bubble diameter, and an inert gas such as nitrogen gas.

In the conventional method of generating fine bubbles, the range of use is limited because the pressure melting method is released from the pressurized part to generate fine bubbles, and the air diffuser method, the fine needle method and the porous plate method have a lift. In short, there are problems in using a highly viscous liquid, transferring water containing fine bubbles, and it is difficult to generate a large amount of fine bubbles.

The fine bubble forming device of the present invention is an improved device of the bubble collapse method, and the Venturi tube method, which is one of the devices having the same mechanism, introduces a gas into the Venturi tube in principle, and the bubbles suddenly appear under high flow velocity conditions. This is a method of collapsing to generate fine bubbles (Non-Patent Document 1). Due to the gas introduction mechanism, there is a problem in generating a large amount of fine bubbles, there is a problem in lifting and transfer of water containing fine air bubbles, and there is a drawback that it is difficult to use a high-viscosity liquid.

Further, when creating fine bubbles by the ejector method, which is a kind of bubble collapse method, it is required to narrow the flow path and make it complicated (Patent Document 1). Further, the fine bubble generator described in Patent Document 2 has a structure in which a spherical object is installed in the center of a circular pipe and a high-speed fluid flows through the gap thereof, and contains highly viscous liquids and impurities (solids and dust). If this is the case, there is a problem that the flow velocity is reduced or clogged. Even if it is a simple ejector method, it is installed directly in the submersible pump (Non-Patent Document 2), and there is a problem in the lifting and transfer of water containing fine bubbles. At the same time, there is a drawback that a large amount of fine bubbles cannot be generated.

Patent application publication number 2015-2016 Patent application publication number 2003-305494

Master's thesis presentation February 3, 2011 "Development of cleaning technology using Ventury tube type microbubble generation method" Hiroki Abe, Department of Structural Energy Engineering, Tsukuba Graduate School Japan Food Science June 2012 issue p36-38

The problem to be solved is that the conventional fine bubble forming device cannot supply a large amount of fine bubbles and is not suitable for cultivation and purification in the sea or lakes, large factory drainage facilities and sewage treatment plants. In addition, it cannot be used for equipment with a lift and equipment with a transfer distance, and it cannot be used for liquids containing highly viscous liquids and solids. The present invention has a cylindrical shape as a basic structure, has a structure with low resistance to fluid, generates a large amount of fine bubbles corresponding to various liquids, and forms fine bubbles that enable the lifting and transfer of water containing fine bubbles. The subject is to provide the device.

From one viewpoint of the present invention, a fine bubble forming apparatus is provided. The fine bubble forming device is
It has a liquid introduction pipe that guides the liquid from the fluid supply means, has a central axis in a direction parallel to the longitudinal direction of the liquid introduction pipe, and has a concentric cylindrical injection nozzle for injecting a pressurized liquid.
It has first and second fine bubble forming tubes provided concentrically with the injection nozzle to generate a fine air-filled liquid by the injection liquid and the gas from the self-priming hole with a diameter larger than that of the injection nozzle.
A gas introduction pipe connected to the self-priming hole provided between the injection nozzle and the fine bubble forming pipe is provided.
The second fine bubble forming tube having a shorter length and a shorter diameter than the angular position (that is, the length until it hits) at which the injection liquid emitted from the injection nozzle reaches the outermost first fine bubble forming tube is described. Arranged inside the first fine bubble forming tube,
It is characterized by that.
The fine bubble forming apparatus 1 has a liquid introduction pipe 3 for guiding a liquid from a fluid supply means, has a central axis (central axis of rotation) in a direction parallel to the longitudinal direction, and is a concentric cylinder for injecting a pressurized liquid. A fine bubble forming tube 7 having a shaped injection nozzle 4 and having a diameter larger than that of the injection nozzle and similarly provided concentrically to generate a fine air-filled liquid by the injection liquid and the gas from the self-priming hole 5. It is a fine bubble forming apparatus having a gas introduction tube 6 connected to the self-priming hole provided between the injection nozzle and the fine bubble forming tube.

The injection nozzle diameter A for obtaining a water pressure of 0.04 to 0.25 Mpa for the pressurized supply liquid guided to the liquid introduction pipe 3 by the fluid supply means is set, and the diameter of A is 1.3 to 4.0 times larger than the diameter of A. The fine bubble forming tube diameter C was set, and the fine bubble forming tube length D was set to be longer than the length until the injection liquid emitted from the injection nozzle spreads due to negative pressure and hits the fine bubble forming tube.

A second fine bubble forming tube having a shorter length and a shorter diameter than the angle position where the injection liquid emitted from the injection nozzle of the fine bubble forming tube reaches the outermost fine bubble forming tube 7 is attached inside the injection liquid. Therefore, a third fine bubble forming tube having a shorter length and a shorter diameter than the angle reached to the second fine bubble generating tube can be attached to the inside thereof, and can be repeatedly installed in the same manner, at least two. It can be attached as described above, and it is a device that forms fine bubbles corresponding to the lift and transfer even if the flow velocity of the liquid introduced from the fluid supply means changes.

It is a device that forms fine bubbles in which the self-absorbing gas is up to 75% (volume) with respect to the amount of liquid passing (volume) for generating fine bubbles (under normal pressure).

It is a device that forms fine bubbles that can move 50% fine bubble-containing water horizontally up to 50 m and 30% fine bubble-containing water horizontally up to 100 m by means of a conduit.

It is a device that forms fine bubbles that can raise 40% fine bubble-containing water up to a lift of 5 m by means of a conduit.

As is clear from the above description, the following effects can be obtained in the present invention.
(1) The fine bubble forming apparatus of the present invention was made in view of the above-mentioned background technology, and a large amount of fine bubbles are generated in deep and wide lakes and marshes, cultivation and purification in oceans, large factory wastewater treatment facilities and sewage treatment plants. It is based on a cylindrical structure that can be supplied and has low resistance to fluids, and has characteristics that can be applied to equipment with a lift, equipment with a transfer, highly viscous liquids, and liquids including solids.

(2) If the pressurized supply liquid guided to the liquid introduction pipe 3 has an appropriate flow rate even if the liquid pressure changes, set the diameter of the injection nozzle, and 1.3 to 4.0 times this diameter. The diameter of the fine bubble forming tube is set, and the length of the fine bubble forming tube should be longer than the length until the jet liquid emitted from the injection nozzle spreads due to negative pressure and hits the fine bubble forming tube. This has made it possible to manufacture devices with various performances.

The invention of the present application is based on a cylindrical structure having low resistance to fluid, and the minimum diameter of the injection nozzle is 10 mm or more in the industrial case, and any liquid containing a solid substance having an injection pipe diameter or less is used. It was possible to form fine bubbles without clogging even in a process with lifting and transfer or in a high-viscosity liquid.

(3) FIG. 2 shows a second fine bubble forming tube 7-1 having a shorter length and a shorter diameter than the angular position where the injection liquid emitted from the injection nozzle of the fine bubble forming tube reached the outermost fine bubble forming tube 7. Attach the third fine bubble forming tube 7-2, which is shorter and shorter than the angle position reached to the second fine bubble generating tube by the jet liquid, and repeatedly install them in the same manner. It is possible to attach at least two or more fine bubble forming tubes, even if there is a lift, if it is transferred far away, or if the flow velocity of the liquid used changes due to viscosity etc. A liquid is sprayed onto the fine bubble generation tube that matches the flow rate, making it possible to create a fine bubble forming device that can respond to changes.

In the processing of aerated foods, the process of mixing fine bubbles into a liquid containing a solid such as a highly viscous liquid or fruit is a common practice, but in conventional fine bubble forming devices, as described above, due to the fine mechanism. Although it was difficult, these can be manufactured by the multifunctional fine bubble forming apparatus of the present invention.

(4) In the fine bubble forming apparatus of the present invention, when the self-absorbing gas reaches 75% (volume) of the liquid passing amount (volume) for generating fine bubbles, the liquid is water and the gas is air. It is possible to supply a large amount of air to the water, oxygen is supplied over a wide range, and it is efficient in culturing and improving the environment in the sea and lake water, culturing algae, green worms, aerobic microorganisms, and microorganisms in active sludge. A good oxygen supply has become possible.

(5) The fine bubble forming apparatus of the present invention has made it possible to transfer water containing fine bubbles horizontally and far away by a conduit, and the creativity of facility design has been greatly increased.

(6) The fine bubble forming apparatus of the present invention can raise the water containing fine bubbles up to a lift of 5 m by a conduit, and the place where it is installed is limited, so that the creativity of the facility design is great.

By flowing a liquid through the fine bubble forming apparatus 1 of the present invention, the gas is self-absorbed, and the depressurized liquid contains bubbles, and while forming a shock wave surface, the bubbles collapse and generate fine bubbles. ..

Next, to explain each portion, the main pipe portion 2 is tubular in the longitudinal direction and has an internal space having a central axis (central axis of rotation) in a direction parallel to the longitudinal direction. The size and thickness of this portion are not limited, and may be designed according to the required amount of fine bubbles.

The liquid introduction pipe 3 is a conduit for introducing the liquid pump liquid B into the injection nozzle, and is adjusted to the diameter of the pump discharge pipe or the hose diameter, and the liquid introduction pipe 3 is centered in a direction parallel to the longitudinal direction. It has an internal space that has a shaft (central axis of rotation) and gradually narrows, and has a mechanism for smooth flow of liquid. The diameter means the diameter in the description of the present invention.

The injection nozzle 4 has a central axis (central axis of rotation) in a direction parallel to the longitudinal direction, and is a portion where the fluid guided from the liquid introduction pipe flows smoothly, the flow velocity is kept constant, and the fluid is injected from the outlet. The fluid creates a negative pressure, gradually expands, and comes into contact with a fine bubble forming tube having a large diameter.

The injection nozzle diameter A may be set so as to have a hydraulic pressure obtained from the amount of liquid introduced from the pump. The hydraulic pressure from the pump may be 0.05 Mpa to 0.2 Mpa, but more preferably the liquid pressure is maintained at 0.08 Mpa to 0.15 Mpa.

When a liquid is injected from the injection nozzle 4, a negative pressure is generated between the liquid and the fine bubble forming tube 7, the gas is self-sufficient from the self-priming hole 5 at the opening thereof, and the depressurized liquid contains the gas and is depressurized. As a result, the bubbles collapse and generate fine bubbles while forming a shock wave surface.

The diameter 5 of the gas introduction pipe 6 or the self-priming hole is not strictly defined, and the cross-sectional shape is square or circular, and there may be one or several, and the thickness is not particularly limited, but if it is too thick, the bubble diameter Is not preferable because it becomes large. If the gas is other than air, it may be connected to the generator or cylinder using a conducting wire. It is even more preferable if a pressure reducing valve and a pressure gauge can be installed according to the number and shape of the self-priming holes.

The fine bubble forming tube 7 has a concentric tubular internal space in the longitudinal direction, receives the liquid ejected from the injection nozzle and forms a negative pressure portion, and the fine bubble forming tube diameter C is 1 with respect to the injection nozzle diameter. The diameter may be 3.3 to 4.0 times, more preferably 1.5 to 3.5 times. The fine bubble forming tube length D only needs to have a length longer than the length until the injection liquid emitted from the injection nozzle spreads due to negative pressure and hits the fine bubble forming tube, and is a portion where fine bubbles are formed.

The gas inflow adjusting device 8 is installed in the self-priming hole or the gas introduction pipe. If it is necessary to limit the amount of gas introduced, install it, but by installing a gas flow rate measuring device ahead of it, the amount of gas introduced can be measured. With water as pure as tap water, finer bubbles can be formed between the injection nozzle and the fine bubble forming tube by narrowing this hole.

The liquid material refers to the environment (specifically, the temperature, pressure, etc. received by the liquid material) when carrying out the present invention (in the case of the apparatus of the present invention, when using the liquid material, the same applies hereinafter). It is possible to use a material having fluidity (a liquid material having fluidity) under environmental conditions). For example, when the present invention is carried out at room temperature (20 to 25 ° C.), those having fluidity at room temperature (20 to 25 ° C.) can be used. Further, when the present invention is carried out at 0 ° C. or lower, those having fluidity at 0 ° C. or lower can be used.

Further, the liquid material does not contain only (1) a liquid (a liquid in the environment (environmental conditions such as temperature) at the time of use), but (2) a liquid (environment at the time of use (temperature)). It also includes those that are liquid under environmental conditions such as) and those that contain impurities that do not dissolve in the liquid (more specifically, those that contain the impurities within the range in which the liquid does not lose its fluidity). Further, if there is no problem, the liquid material may contain a gas. Liquids include, for example, water, oils and fats, mineral oils, organic solvents, river water, lake water, seawater, wastewater treatment water, washing water (mixed liquid of surfactant), bath water, drinks, processed food mix liquid. , Blood, liquid containing solids (eg, metal or inorganic particles, fruits / cut vegetables) and the like.

As the gas for forming fine bubbles, one that is a gas in the environment for carrying out the present invention (specifically, environmental conditions such as temperature and pressure received by the gas for forming fine bubbles) shall be used. Can be done. For example, when the present invention is carried out at room temperature (20 to 25 ° C.), a gas at room temperature (20 to 25 ° C.) can be used.

Further, as the gas for forming fine bubbles, a gas can be appropriately selected according to the intended use and purpose of use. For example, ozone gas or a gas containing ozone gas is used to maintain the bactericidal power of the liquid material that is going to form fine bubbles. Further, when it is desired to minimize the chemical influence on the liquid material for which fine bubbles are to be formed, an inert gas such as nitrogen gas is used. Further, when it is desired to increase the concentration of dissolved oxygen in the liquid material for which fine bubbles are to be formed, oxygen can be used.

The elements of the fine bubble forming apparatus of the present invention are shown by the pressure of the introduced liquid, the injection nozzle diameter, the fine bubble forming tube diameter and the length, but of course, the flow rate and the flow velocity depending on the introduced liquid and the injection nozzle diameter at each pressure. The relationship is in Bernoulli's theorem.

The material of the fine bubble forming apparatus of the present invention may be any material as long as the morphology can be maintained by metal, plastic, ceramic, etc. , Any size (ability) can be handled.

It is the fine bubble formation apparatus figure of the best 1st form for carrying out the invention of this application. It is the fine bubble formation apparatus figure of the best 3rd form for carrying out the invention of this application.

Hereinafter, the description will be given based on the embodiment of the present invention, but the following will be described in more detail with reference to examples. However, the invention of the present application is not limited to these examples as long as the gist of the present invention is not exceeded.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 1 is a schematic cross-sectional view of a cylindrical fine bubble forming apparatus 1 according to an embodiment of the present invention (longitudinal length of the substantially cylindrical fine bubble forming apparatus 1). It is a schematic cross-sectional view of the direction (however, hatching is omitted). This device uses a pump or the like to flow a pressurized liquid (a) having an appropriate pressure through the liquid introduction pipe 3 in the main pipe portion 2 of the fine bubble forming device 1, and when the pressurized liquid (a) is injected from the injection nozzle 4, the diameter is larger than that of the injection nozzle. A negative pressure is generated between the fine bubble forming tubes 7, the gas is self-sucked from the self-sufficient hole 5 of the gas introduction tube 6, the gas is contained in the negatively pressured liquid, and the shock wave surface hits the fine bubble forming tube 7 described above. While forming, the bubbles collapsed and fine bubbles were continuously formed.

An optimal submersible pump (2.2 kW to 5.5 kW) is installed in front of the fine bubble forming device of the present application regarding the setting of the fine bubble forming tube diameter, and the pressure is connected to the liquid introduction tube 3 from here with a 3 or 4 inch hose. Using a meter (Yamamoto Keiki Seisakusho Co., Ltd.), inject from a jet nozzle with a diameter of 7 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm at a pressure between 0.05 Mpa and 0.2 Mpa, and change the diameter larger than the injection nozzle. A fine bubble forming tube 7 is installed, and a gas is sucked from the self-sufficient hole 5 of the gas introduction tube 6 to generate a gas of 75% (V) of the water flow rate (V: volume) as fine bubbles. The diameter was measured respectively. The amount of gas was measured with a gas flow meter (CML080: Asville Co., Ltd.) connected to the self-priming hole, and the fine bubble diameter was confirmed by using the above-mentioned turbidity meter and checking the white turbidity disappearance time of the discharged liquid. ..

Table 1 summarizes the average value of the fine bubble forming tube diameter suitable for sucking 75% (V) of the water flow rate (V) at each injection nozzle diameter and forming fine bubbles. The relational expression of the fine bubble forming pipe diameter when the injection pipe nozzle diameter is 7 mm is [Equation 1] Y = 61.4x + 8.9, and the relational expression of the fine bubble forming pipe diameter when the injection pipe nozzle diameter is 20 mm is [Equation 1] Y = 61.4x + 8.9. [Equation 2] Y = 174.8x + 25.5, the relational expression of the fine bubble forming tube diameter when the injection nozzle tube diameter is 25 mm is [Equation 3] Y = 221.2x + 31.95, and the fineness when the injection nozzle tube diameter is 30 mm. The relational expression of the bubble formation diameter is [Equation 4] Y = 265.8x + 38, the relational expression of the fine bubble formation tube diameter at the injection nozzle tube diameter of 35 mm is [Equation 5] Y = 310.2x + 44.3, and the injection nozzle tube diameter is 40 mm. The relational expression of the fine bubble forming tube diameter in was [Equation 6] Y = 354x + 50.7. x is the water pressure (Mpa), and from these results, it was clarified that the diameter of the fine bubble forming tube decreases as the water pressure decreases, and the diameter increases as the water pressure increases.

単位mm
[Table 1]
Fine bubble forming tube diameter at each Mpa at the injection nozzle diameter

Unit mm

It relates to the change of the head (pump head 3m, pump head 10m) from the submersible pump to the fine bubble forming device.
A submersible pump (model: Ebara DL type sewage sewage submersible pump 1000DLB75.7 7.5 kW: Ebara Corporation) was installed in front of the fine bubble forming device of the present application, and a 4-inch hose was used to lift the head from the submersible pump to 3 m. It was connected to the liquid introduction tube 3 and injected from an injection nozzle 4 (flow rate: 2200 l / min) having a diameter of 59 mm to a bubble forming tube diameter of 121.2 mm and a tube length of 607 mm at a pressure of 0.09 Mpa.

Further, using the same pump as described above, the submersible pump is connected to the liquid introduction pipe 3 at a lift of 10 m, and the bubble forming pipe diameter is connected from the injection nozzle 4 (flow rate: 1000 l / min) having a diameter of 39.7 mm at a pressure of 0.09 Mpa. It was sprayed to 81.5 mm and a pipe length of 607 mm. When the amount of gas was measured by the above-mentioned flow meter connected to the self-priming hole, both gas generated 75% of the water flow rate (V) as fine bubbles.

It relates to the transfer distance of fine bubble water by a double fine bubble formation tube.
Using a pump (7.5 kW: Ebara DL type sewage sewage submersible pump 1000DLB75.7: Ebara Seisakusho Co., Ltd.) with a 4-inch hose, a liquid introduction pipe with a lift of 3 m from the submersible pump to the fine bubble forming device. It is connected to 3 and is injected from an injection nozzle 4 having a diameter of 59 mm (flow rate: 2200 l / min) to a bubble forming tube (pipe diameter 121.2 mm, pipe length 607 mm) at a pressure of 0.09 Mpa, and an 8-inch vinyl chloride with a discharge head of 0 m. A pipe was connected to generate a gas having a water flow rate (V) of 75% as fine bubbles.

When a second fine bubble forming tube (tube diameter 97.0 mm, pipe length 2043 mm) is installed inside the fine bubble forming tube and injected from an injection nozzle, 50% of fine bubbles are discharged if the discharge head is 0.5 m or less. It became possible to transfer the contained water by about 50 m, and it became possible to transfer the water containing 30% fine bubbles by about 100 m.

The present invention relates to a comparison in the case where the pump head is 3 m and the discharge head is 0 m by the double fine bubble forming pipe, and the case where the pump head is 3 m and the discharge head is 5 m.
A submersible pump (7.5 kW: Ebara DL type sewage sewage submersible pump 1000DLB75.7: Ebara Seisakusho Co., Ltd.) was installed in front of the fine bubble forming device of the present application, and from here, a 4-inch hose was used to minute the water from the submersible pump. Connected to the liquid introduction pipe 3 at a lift of 3 m to the bubble forming device, and from the injection nozzle 4 (flow rate: 2200 l / min) having a diameter of 59 mm at a pressure of 0.09 Mpa to the bubble forming pipe (tube diameter 121.2 mm, pipe length 607 mm). A 6-inch PVC pipe with a discharge height of 0 m and a length of 3 m was connected to generate a gas with 75% of the water flow rate (V) as fine bubbles. could not.

In the case of a discharge lift of 5 m, a second fine bubble forming tube (tube diameter 88.0 mm, pipe length 220 mm) is installed inside the fine bubble forming tube, and when the injection nozzle 4 is used to inject water, the water flow rate (V) is 40. % (V) gas was generated as fine bubbles. By installing the fine bubble forming tube twice, it can be used even when the discharge head is 0 m to 5 m.

The present invention relates to a fine bubble forming apparatus having a multiple fine bubble forming tube.
Gradually add 20 kg of skim milk powder, 14 kg of sugar, 6 kg of gelatin powder, and 10 kg of cornstarch to 180 L of water while stirring, gradually heat from low heat to reach 75 ° C, and then lower to around 45 ° C while stirring to make milk mousse. I made a mix. When this mix was measured with a viscometer (LVDV-Iprime Co., Ltd.) while lowering the temperature to 40 ° C. or lower, the viscosity increased from 160 to 400 cp with the decrease in temperature and the passage of time.

This mixed liquid is sucked by a pump (Tsurumi 40PSF2.4S: Tsurumi Seisakusho Co., Ltd.), and a fine bubble forming tube with a tube diameter of 18.2 mm and a tube length of 250 mmn is used with an injection nozzle 4 having a diameter of 7 mm. When passed through a fine bubble forming device having a fine bubble forming tube with a tube length of 120 mm and a fine bubble forming tube having a tube diameter of 10.4 mm and a tube length of 50 mm inside, air is self-absorbed and thickening containing fine bubbles. A sol-like liquid was formed.

Pour the finished fine bubble-containing sol solution into a 100 ml container without any gaps, gel it in a refrigerator and measure its weight, transfer the mixed solution that has not been treated to contain bubbles to a 100 ml container, and measure the weight. As a result of measuring the weight of only the container in the same manner and calculating according to the measurement method of overrun such as ice cream, a bavarois-like dessert having an overrun of 30% to 75% was produced.

The present invention is a multifunctional fine bubble forming measure capable of generating a large amount of fine bubbles with various settings (lift, transfer) with a wide range of hydraulic pressure and viscosity solutions. For example, it can be used for aquaculture and water quality improvement in lakes, as an efficient source of dissolved oxygen in wastewater treatment plants, in complex facilities that require lifting and transportation, and for processing aerated foods, etc. , Chemical industry, medical and welfare and can be used in a wide range of fields. In addition, if various gases and liquids (including individuals) are used, it is a highly usable technology for advanced food processing, diversification of chemical reactions, medical practice, and the like.

1. 1. Fine bubble forming device 2. Chief executive 3. Liquid introduction tube 4. Injection nozzle 5. Self-priming hole 6. Gas vessel 7. Fine bubble forming tube 8. Gas inflow regulator

Claims (6)

It has a liquid introduction pipe that guides the liquid from the fluid supply means, has a central axis in a direction parallel to the longitudinal direction of the liquid introduction pipe, and has a concentric cylindrical injection nozzle for injecting a pressurized liquid.
It has first and second fine bubble forming tubes provided concentrically with the injection nozzle to generate a fine air-filled liquid by the injection liquid and the gas from the self-priming hole with a diameter larger than that of the injection nozzle.
A gas introduction pipe connected to the self-priming hole provided between the injection nozzle and the fine bubble forming pipe is provided.
The second fine bubble forming tube having a shorter length and a shorter diameter than the angle position where the injection liquid emitted from the injection nozzle reaches the outermost first fine bubble forming tube is inside the first fine bubble forming tube. A fine bubble forming device, characterized in that it is arranged in At least a third fine bubble forming tube having a shorter length and a shorter diameter than the angle position reached to the second fine bubble generating tube by the jet liquid is arranged inside the tube, and the same applies to the fourth and higher cells. The fine bubble forming apparatus according to claim 1, wherein the fine bubble forming tube is configured to be arranged inside the fine bubble forming tube. The injection nozzle diameter (A) for the pressurized supply liquid guided to the liquid introduction pipe by the fluid supply means to obtain a liquid pressure of 0.04 to 0.25 Mpa is set, and 1.3 to 4 with respect to the diameter of (A). The fine bubble forming tube diameter (C) is set to 0.0 times, and the fine bubble forming tube length (D) is longer than the length until the injection liquid emitted from the injection nozzle spreads due to negative pressure and hits the fine bubble forming tube. The fine bubble forming apparatus according to claim 1 or 2. The fine bubble forming apparatus according to any one of claims 1 to 3, wherein the self-absorbing gas reaches 75% (volume) with respect to the liquid passing amount (volume) for generating fine bubbles. The fine bubbles according to any one of claims 1 to 4, wherein 50% of the fine bubble-containing water can be moved horizontally to 50 m and 30% of the fine bubble-containing water can be moved horizontally to 100 m by the conduit. Forming device. The fine bubble forming apparatus according to any one of claims 1 to 5, wherein 40% of fine bubble-containing water can be raised to a lift of 5 m by means of a conduit.

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