Liquid oxygen dissolving device

Abstract

To provide a liquid oxygen dissolving device capable of dissolving atmospheric oxygen in a large amount of liquid efficiently in an energy-saving manner with simple component constitution.SOLUTION: There is provided a liquid oxygen dissolving device configured to: generating mixed flows 1h, 1i and 1j by causing liquid 1e to collide against a position 14 of a bent hollow pipe 2 to take the air into the liquid 1e in the form of air bubbles; and change a space in the bent hollow pipe 2 into three cavities 2i, 2j and 2k. The liquid oxygen dissolving device is configured to: emit the mixed flows 1h, 1i and 1j into the space to separate the same into air bubbles and liquid lumps; let the air bubbles and liquid lumps fall through gravitation; let the air bubbles stay in the cavities 2i, 2j and 2k by the use of mass differences between the air bubbles and liquid lumps; and also let the air bubbles move into the mixed flows after the cavities 2i, 2j and 2k are filled with the air bubbles so as to dissolve a large amount of oxygen of the air bubbles in the liquid in the mixed flow. The liquid oxygen dissolving device can generate the air bubbles and dissolve the oxygen of the air bubbles in the liquid in an energy-saving manner as a free falling speed of the liquid freely falling by a perpendicular distance H4 between a liquid pour port 1b and the bent hollow pipe is added to liquid velocity increase of the liquid 1e.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention makes it possible to dissolve oxygen in hypoxic water masses that occur in large enclosed water areas such as reservoirs, dam lakes, lakes and coastlines, improve water quality by activating microorganisms living in the water, and maintain or improve the environment necessary for the habitat of living organisms such as aquatic plants and fish.

[0002] In particular, by using a liquid injection part that can be adjusted vertically, horizontally, and at an angle of rotation, as well as the injection rate and amount of water, and a curved hollow pipe in which the liquid injected from the liquid injection part creates a distinctive flow, air bubbles are generated, a mixed flow is generated by the incorporation of the air bubbles into the liquid, a cavity is formed between the mixed flow and the inner wall of the curved hollow pipe, and mutual movement of air bubbles between the air bubbles accumulated in the cavity and the mixed flow is promoted, thereby enabling the oxygen in the air bubbles in the mixed flow to be efficiently dissolved into the liquid.

[0003] Furthermore, this liquid oxygen dissolving device can reduce the energy required to dissolve oxygen by utilizing the effect of gravity to increase the flow rate of the liquid when the liquid injected from the liquid injection portion collides with the inner wall of the outer shell of the curved hollow pipe. [Background technology]

[0004] Conventionally, several techniques for dissolving oxygen in water have been used to eliminate hypoxic water masses and hypoxic water areas that occur in large closed water areas such as reservoirs, dam lakes, lakes and marshes, and coasts. A representative technique for supplying oxygen to hypoxic water masses and hypoxic water areas is a method that uses air bubbles. Another method is to dissolve oxygen in water by stirring the water on the surface with a fountain or a forced stirring device with an impeller to increase the contact area between the water and the atmosphere.

[0005] For example, a method of using air bubbles includes a method of supplying compressed air to an air diffuser having porous, small-diameter holes, supplying air bubbles into water, and dissolving oxygen in the air bubbles into the water. A method of supplying fine bubbles into water, and dissolving oxygen in the fine bubbles into the water. A method of dissolving oxygen in the water by rotating an impeller near the water surface to agitate the water and air and increasing the contact area between the water and air. A method of dissolving oxygen in the water by installing a fountain near the water surface to spray water into the air to increase the contact area between the water and air, dissolving oxygen in the air into the water, and further slamming the water mass with dissolved oxygen onto the water surface to agitate the water surface, increasing the contact area between the water and air, and supplying oxygen to the water.

[0006] However, the above technology requires large-scale equipment such as a compressor for compressing gas and a motor for driving the compressor, which requires labor and costs for power consumption and maintenance. In the device for generating fine bubbles, the pores of the porous air diffuser with small holes for generating nano- to micro-sized bubbles become clogged due to the adhesion of foreign matter or underwater plants, which reduces the amount of bubbles generated and the amount of oxygen supplied, resulting in a huge amount of maintenance work. If the device for stirring and mixing the water and air by rotating the impeller on the water surface is not large, it is necessary to install many devices, and large-scale equipment such as a motor for driving the impeller is required, which requires a huge amount of labor and costs for power consumption and maintenance. The use of fountains, etc. also has the same issues as above.

[0007] The underwater oxygen dissolution technology described above is being used because, while there is a need to solve problems such as improved efficiency, improved maintainability, and reduced power consumption, there are currently no specific technologies that can solve these problems. In addition, it is difficult for the above technology to efficiently dissolve large amounts of oxygen into water with little energy for hypoxic water masses that occur in large closed water areas such as reservoirs, dam lakes, lakes and coastlines, and for large amounts of hypoxic water that exist in hypoxic water areas.

[0008] As a method for solving the above problems, a technology is disclosed in JP 2006-836 / JP 2004-206590 as an Air Bubble-Containing Water Flow Generator and a Pollutant Removal Device Equipped with the Same, in which a mixture of gas and water is sprayed into a sealed container kept at a pressure greater than atmospheric pressure and the sprayed mixture is collided with the bottom of the container to generate a large amount of air bubbles, the generated air bubbles grow into liquid bubbles over time, gas is dissolved in the outer membrane water of the grown liquid bubbles by the action of a pressure greater than atmospheric pressure inside the sealed container, and the liquid bubbles are poured into the liquid below, thereby efficiently dissolving a large amount of oxygen into the liquid.

[0009] The problem of the pollutant removal device 1 equipped with the bubble-containing water flow generator in the embodiment described in JP 2006-836 / JP 2004-206590 will be described. The description will be given with reference to the gas dissolution regulator 4 that dissolves gas, and the enlarged front cross-sectional view of the gas dissolution regulator 4 shown in FIG.

[0010] By operating the pump 20 and sucking the water W in the lake through the suction pipe 20a, the negative pressure generated in the suction pipe 20a is used to suck the gas X from the fine hole of the gas self-suction pipe 20b by the adjustment valve 20c, in an amount slightly larger than the amount of gas X dissolved in the tank 21. A pressurized mixture of gas X and water W is produced on the discharge side of the pump 20, and is sprayed toward the center bottom of the liquid foam generating vessel 23 from the nozzle 22 located at the top of the closed tank 21. As shown in the enlarged view of the flow of air bubbles and liquid bubbles in the liquid foam generating vessel 23 shown in FIG. 2a, a large amount of gas X in the tank is sucked in, and a large amount of air bubbles can be generated at the bottom of the liquid foam generating vessel 23.

[0011] The large amount of bubbles generated at the bottom of the liquid foam generating container 23 rises up the peripheral wall of the container 23 due to buoyancy, and changes into liquid bubbles in the upper reduced diameter area as shown in Figure 2b. As a result, the water W injected into the tank 21 becomes a thin film of water on the surface of the liquid bubbles, and gas X is dissolved in high concentration in this thin film of water according to the pressurized gas P in the tank 21. The liquid bubbles overflow from the top of the liquid foam generating container 23 and are temporarily stored in the lower part of the tank 21 as dissolved pressurized water 2W.

[0012] However, it is necessary that all of the pressurized mixed water of gas X and water W sprayed from the nozzle 22 turns into bubbles, not just a large amount at the bottom of the liquid foam generating container 23. This is because if even a small amount of water W remains in the pressurized mixed water of gas X and water W in the liquid foam generating container 23, the water W will continue to remain in the liquid foam generating container 23 among the pressurized mixed water of gas X and water W sprayed continuously from the nozzle 22. Therefore, the water level in the liquid foam generating container 23 gradually rises, and the pressurized mixed water of gas X and water W sprayed from the nozzle 22 does not directly collide with the bottom of the inner container of the liquid foam generating container 23, but collides with the liquid remaining at the bottom of the container. As a result, the amount of bubbles generated gradually decreases.

[0013] The pressurized mixed water of gas X and water W sprayed from the nozzle 22 remains at the bottom of the liquid foam generating container 23, and the liquid level gradually rises, so that the pressurized mixed water of gas X and water W remaining in the liquid foam generating container 23 eventually overflows from the upper edge of the liquid foam generating container 23, greatly reducing the liquid foam generating effect of the liquid foam generating container 23. The water W sprayed into the tank 21 does not become a thin film of water on the surface of the liquid bubbles, but overflows from the upper edge of the liquid foam generating container 23, and gas X is not dissolved in a high concentration in the thin film of water according to the pressurized gas P in the tank 21, and the pressurized mixed water of gas X and water W sprayed from the nozzle 22 is stored as 2W at the bottom of the tank 21.

[0014] It is known that the thickness of the thin film that changes from air bubbles to liquid bubbles is about several tens of nanometers. Therefore, even if a large number of liquid bubbles are generated, the amount of thin film water is small, and a large-scale device is required to dissolve oxygen in a large amount of water.

[0015] In order to turn all of the mixed water of gas X and liquid W into bubbles, it is necessary to dissolve the gas in the liquid to make it supersaturated, and then to rapidly transfer the supersaturated liquid from a pressurized state in a container to a depressurized state. Unless an environment is created where the pressure can be instantly reduced from high to low, it is difficult to turn all of the liquid into bubbles.

[0016] In the case of this document, the pressure drop is slight when the mixed water of gas X and liquid W is sprayed from the spray nozzle 22 into the sealed container 21. In addition, the mixed water of gas X and liquid W sprayed from the spray nozzle 22 into the sealed container 21 is mixed water in which gas X has been taken into the liquid W as bubbles. Therefore, it is difficult to make the liquid W collide with the bottom part of the liquid foam generating container 23 and turn all of the liquid into bubbles.

[0017] Also, to generate liquid bubbles from the air bubbles, change the water W into a thin water film on the surface of the liquid bubbles, and dissolve the gas into the thin water film, it takes a certain amount of time from the generation of air bubbles to the generation of liquid bubbles, and then for the gas to dissolve into the thin water film. To generate air bubbles and dissolve oxygen into a large amount of water that can improve the environment of dams and lakes, the device in Figure 2 is inevitably large. The pumps attached to the device and the power supply device that runs the pumps are also large and complicated, resulting in high power consumption. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent Publication No. 2006-836 / Patent Application No. 2004-206590 Summary of the Invention [Problem to be solved by the invention]

[0019] The present invention is intended to address the above-mentioned conventional problems. The liquid oxygen dissolving device can dissolve atmospheric oxygen in the liquid by passing the liquid through the liquid oxygen dissolving device. The liquid oxygen dissolving device is efficient in generating bubbles and taking the bubbles into the liquid, and can utilize the action of gravity to generate bubbles and take the bubbles into the liquid. As a result, it is possible to reduce the energy required to dissolve oxygen from the bubbles into the liquid, and to provide a liquid oxygen dissolving device that can efficiently dissolve oxygen in the bubbles into a large amount of liquid. [Means for solving the problem]

[0020] The first invention will be described with reference to Figs. 1 and 2. The first invention is a liquid oxygen dissolving device comprising a curved hollow pipe 2 equipped with a liquid injection part 1 for injecting liquid 1e. A pump for supplying liquid to the liquid injection part 1 and a power device for driving the pump are provided separately from the liquid oxygen dissolving device. Note that this is called a liquid oxygen dissolving device rather than a submersible oxygen dissolving device because this device is intended for liquids with different masses, such as fresh water, seawater, and water containing fine particles, in which oxygen is dissolved.

[0021] The second invention will be described with reference to FIG. 2. The liquid injection part 1 has a liquid injection port 1a for injecting the liquid 1e, and the injection flow rate and injection amount of the liquid 1e to be injected can be changed. The vertical position, horizontal position, and rotation angle of the liquid injection part 1 can be changed. The vertical position of the liquid injection part 1 is determined by the distance H4 between the lower central position 1b of the liquid injection part 1 and the inner wall top 13 of the outer vertical pipe 2b of the curved hollow pipe 2. The horizontal position of the liquid injection part 1 is determined by the distance L between the lower central position 1b of the liquid injection part 1 and the inner wall top 13 of the outer vertical pipe 2b of the curved hollow pipe 2. The rotation angle of the liquid injection part 1 is determined by the angle α between the central axis 1d connecting the lower central position 1b and the upper central position 1c of the liquid injection part 1 and a horizontal line 1f drawn horizontally from the upper central position 1c of the liquid injection part 1. The angle α is positive counterclockwise, with the horizontal line 1f being 0°.

[0022] The curved hollow pipe 2 is composed of an upper vertical pipe with outer shells 2a and 2b, a horizontal pipe with bottom 2c and ceiling 2d, and a lower vertical pipe with outer shells 2e and 2f. The curved hollow pipe 2 has an upper opening of the upper vertical pipe and a lower opening of the lower vertical pipe, and is bent at two points: positions 4 and 12 between the upper vertical pipe and the horizontal pipe, and positions 6 and 10 between the horizontal pipe and the lower vertical pipe. The flexion angle ∠3, 4, 6 at position 4 is in the range of 90°-10° or more and 90°+10° or less. The flexion angle ∠13,12,10 at position 12 is in the range of 90°-10° or more and 90°+10° or less. The flexion angle ∠12,10,8 at position 10 is in the range of 90°-10° or more and 90°+10° or less. The flexion angle ∠4, 6, 7 at position 6 is in the range of 90°-10° or more and 90°+10° or less. The above four bending angles are positive when turned left.

[0023] The vertical position, horizontal position, and rotation angle of the curved hollow pipe 2 can be changed. The vertical and horizontal positions of the curved hollow pipe 2 are defined by the x and y coordinates of position 4. The rotation angle of the curved hollow pipe 2 is defined by the angle θ between the horizontal line 2h drawn at position 4a and the outer vertical pipe 2a above the curved hollow pipe 2. The angle θ is positive in the counterclockwise direction, with the horizontal line 2h being 0°.

[0024] When the horizontal position L, vertical position H4, and rotation angle α of the liquid injection section 1 are fixed, the horizontal position x, vertical position y, and rotation angle θ of the curved hollow pipe 2 can be changed to adjust the position 14 and angle α at which the liquid 1e injected from the liquid injection port 1a of the fixed liquid injection section 1 collides with the inner wall of the upper vertical pipe outer shell 2b of the curved hollow pipe 2.

[0025] Conversely, when the horizontal position x, vertical position y, and rotation angle θ of the curved hollow pipe 2 are fixed, the horizontal position L, vertical position H4, and rotation angle α of the liquid inlet 1a of the liquid injection section 1 can be changed to adjust the position 14 and angle α at which the liquid 1e injected from the liquid inlet 1a of the liquid injection section 1 collides with the inner wall of the upper vertical pipe outer shell 2b of the curved hollow pipe 2.

[0026] The third invention will be described with reference to Fig. 2. By arranging the opening of the upper vertical pipe of the curved hollow pipe 2 at the top and the opening of the lower vertical pipe of the curved hollow pipe 2 at the bottom, and individually adjusting the horizontal position L, vertical position H4, rotation angle α, and liquid injection flow rate of the central position 1b of the liquid injection port 1a of the liquid injection portion 1, and the horizontal position x, vertical position y, and rotation angle θ of the curved hollow pipe 2, liquid 1e is injected into the curved hollow pipe 2 from the liquid injection port 1a of the liquid injection portion 1, the position 14 where the injected liquid 1e collides with the inner wall of the outer shell 2b of the upper vertical pipe of the curved hollow pipe 2 and the collision angle α can be adjusted.

[0027] As a result of the above, liquid 1e that collides at angle α with position 14 on the inner wall of the outer shell 2b of the upper vertical pipe 2 of the curved hollow pipe 2 breaks up into a collection of liquid masses, which then become mixed flows 1h, 1i, and 1j that incorporate the surrounding air as air bubbles into the collection of liquid masses, and are reflected in the -α direction with respect to the horizontal line 1g. The mixed flows 1h, 1i, and 1j flow toward the bottom 2c of the horizontal pipe of the curved hollow pipe.

[0028] Position 15 is the center position between positions 5 and 4 of the horizontal pipe bottom 2c of the bent hollow pipe 2. Position 5 represents the point where position 12 of the bent hollow pipe 2 hits the horizontal pipe bottom 2c of the bent hollow pipe 2 when extended vertically downward.

[0029] When the vertical position H4, horizontal position L, and rotation angle α of the liquid injection site 1 and the vertical position y, horizontal position x, and rotation angle θ of the curved hollow pipe 2 are adjusted so that the main stream 1h of the mixed flows 1h, 1i, and 1j collides within the central 3 / 4 range of the distance between positions 5 and 4, the mixed flows 1h, 1i, and 1j will branch out to the left and right toward the surface of the paper after colliding with position 15.

[0030] The flow branching off to the right when the mixed flows 1h, 1i, and 1j collide at position 15 flows as an upper layer flow 19, a middle layer flow 20, and a lower layer flow 21 through the horizontal pipe bottom 2c toward the outer shell 2a of the upper vertical pipe of the curved hollow pipe 2.

[0031] In order to simply express the behavior of liquid flowing at any depth through the horizontal pipe bottom 2c, the water depth from the liquid surface to the bottom is divided into thirds, and the flow of the liquid is expressed as an upper layer flow 19 representing the upper 1 / 3, a middle layer flow 20 representing the central 1 / 3, and a lower layer flow 21 representing the lower 1 / 3.

[0032] Part of the underlayer flow 21 flowing toward the outer shell 2a separates and forms a separated vortex at the intersection 4 between the horizontal pipe bottom 2c of the curved hollow pipe 2 and the outer shell 2a of the upper vertical pipe of the curved hollow pipe 2. Most of the underlayer flow 21 changes direction and flows diagonally upward to the right. The underlayer flow 21 flowing diagonally upward to the right collides with the inner wall position 16 of the outer shell 2a of the upper vertical pipe of the curved hollow pipe 2 diagonally upward to the right.

[0033] The underflow 21 that collides obliquely upward to the right with the inner wall position 16 of the upper vertical pipe outer shell 2a of the curved hollow pipe 2 changes direction to obliquely upward to the left and is discharged into the space. The underflow 21 discharged into the space is divided from a continuous flow into an underflow 21' consisting of discontinuous liquid masses. Under the action of gravity, the underflow 21' changes direction from an upwardly leftward direction to a horizontal direction, and then to a downwardly leftward direction, and collides with the peripheral flow 1i of the mixed flow, and is taken in by the mixed flows 1h, 1i, and 1j.

[0034] The mid-layer flow 20 flowing toward the outer shell 2a is located above the underlayer flow 21 and flows in a similar manner to the underlayer flow 21. The upper layer flow 19 of the mixed flow flowing toward the outer shell 2a is located above the mid-layer flow 20 and flows in a similar manner to the mid-layer flow 20.

[0035] The upper layer flow 19, middle layer flow 20, and lower layer flow 21 flowing toward the upper vertical pipe outer shell 2a of the curved hollow pipe 2 collide with the inner wall position 16 of the upper vertical pipe outer shell 2a of the curved hollow pipe 2, changing direction to become the lower layer flow 21', middle layer flow 20', and lower layer flow 19', and the flows formed before colliding with the peripheral flow 1i of the mixed flow and being taken in by the mixed flows 1h, 1i, and 1j change the space inside the curved hollow pipe 2 into a cavity 2i whose outer periphery is formed by the mixed flows 1h, 1i, and 1j and the lower layer flow 21, middle layer flow 20, and upper layer flow 19 of the mixed flow, and the lower layer flow 21', middle layer flow 20', and upper layer flow 19'.

[0036] The flow branching off to the left when the mixed flows 1h, 1i, and 1j collide at position 15 flows as an upper layer flow 22, a middle layer flow 23, and a lower layer flow 24 through the horizontal pipe bottom 2c of the curved hollow pipe 2 toward the outer shell 2f of the vertical pipe below the curved hollow pipe 2.

[0037] When the upper layer flow 22, middle layer flow 23, and lower layer flow 24 flowing along the horizontal pipe bottom 2c toward the outer shell 2f reach the intersection position 6 of the horizontal pipe bottom 2c and the lower vertical pipe outer shell 2e, the lower part is released, and part of the lower layer flow 24 subjected to the action of gravity separates and becomes a flow of discontinuous liquid masses instead of a continuous flow, which changes direction diagonally downward to the left from the horizontal as flow 24' and flow 24'', collides with the inner wall of the lower vertical pipe outer shell 2f of the curved hollow pipe 2, and becomes flow 27 that flows along the inner wall of the lower vertical pipe outer shell 2f of the curved hollow pipe 2.

[0038] The mid-layer flow 23 flowing through the horizontal pipe bottom 2c toward the outer shell 2f collides with the inner wall position 17 of the lower vertical pipe outer shell 2f of the curved hollow pipe 2, and branches into an upward mixed flow and a downward mixed flow.

[0039] The downward mixed flow merges with flows 24' and 24'' that are separated from the underflow 24 colliding with the inner wall of the outer shell 2f of the lower vertical pipe, and then merges with flow 27 flowing along the inner wall of the lower vertical pipe 2f of the curved hollow pipe 2, and the flow 27 is discharged from the opening below the lower vertical pipe of the curved hollow pipe 2.

[0040] The intermediate layer flow 23 which collides with the inner wall position 17 of the outer shell 2 f of the lower vertical pipe of the curved hollow pipe 2 and flows upward as an underlayer flow 25 toward the ceiling 2 d of the horizontal pipe of the curved hollow pipe 2 .

[0041] Part of the underflow 25 flowing toward the ceiling 2d of the horizontal pipe of the curved hollow pipe 2 separates at the intersection position 10 of the horizontal pipe ceiling 2d and the outer casing 2f of the lower vertical pipe of the curved hollow pipe 2, forming a separated vortex. Most of the underflow 25 changes direction diagonally upward to the right and collides with position 18 on the ceiling 2d of the horizontal pipe.

[0042] The underflow 25 that collides with position 18 on the ceiling 2d of the horizontal pipe diagonally upward to the right changes direction to diagonally downward to the right and is discharged into the space. The underflow 25 discharged into the space becomes an underflow 25' consisting of discontinuous liquid masses instead of a continuous flow. The underflow 25' falls in a parabolic arc due to the action of gravity, and collides with the upper flow 22 flowing through the bottom 2c of the horizontal pipe of the curved hollow pipe 2 toward the outer shell 2f of the lower vertical pipe, and is taken in by the upper flow 22, the middle flow 23, and the underflow 24.

[0043] The upper layer flow 22 flowing through the horizontal pipe bottom 2c toward the outer shell 2f collides with position 17 on the inner wall of the lower vertical pipe outer shell 2f of the curved hollow pipe 2, collides with the upward-flowing underlayer flow 25, turns upward, and flows as upper layer flow 26 toward the horizontal pipe ceiling 2d of the curved hollow pipe 2c. The upper layer flow 26 toward the horizontal pipe ceiling 2d of the curved hollow pipe 2 is located above the underlayer flow 25, and like the underlayer flow 25, turns diagonally downward to the right at position 18 on the horizontal pipe ceiling 2d of the curved hollow pipe 2 and falls in a parabolic curve, collides with the upper layer flow 22 flowing through the bottom 2c of the horizontal pipe of the curved hollow pipe 2 toward the lower vertical pipe outer shell 2f, and is taken in by the upper layer flow 22, middle layer flow 23, and underlayer flow 24 of the mixed flow.

[0044] The upper layer flow 22 and middle layer flow 23 of the mixed flow flowing through the bottom 2c of the horizontal pipe of the curved hollow pipe 2 toward the outer casing 2f of the lower vertical pipe of the curved hollow pipe 2 collide with the inner wall position 17 of the outer casing 2f of the lower vertical pipe of the curved hollow pipe 2, and the upward flow forms a flow that transforms the space inside the horizontal pipe of the curved hollow pipe 2 into two cavities 2j and 2k.

[0045] The outer periphery of the cavity 2j is formed by an upper layer flow 22 and a middle layer flow 23 that flow along the bottom 2c of the horizontal pipe of the curved hollow pipe 2 toward the outer casing 2f of the lower vertical pipe of the curved hollow pipe 2, a lower layer flow 25 that collides with position 17 of the outer casing 2f of the lower vertical pipe of the curved hollow pipe 2 and flows toward the ceiling 2d of the horizontal pipe, an upper layer flow 26, and a lower layer flow 25' and an upper layer flow 26' that are discontinuously connected liquid masses that collides with position 18 on the ceiling 2d of the horizontal pipe and flows diagonally downward to the right.

[0046] Cavity 2k is formed by mixed flows 1h, 1i, and 1j, and the upper layer flow 22, middle layer flow 23, and lower layer flow 24 which branch off to the left of the screen when mixed flows 1h, 1i, and 1j collide at position 15 on the bottom 2c of the horizontal pipe, the lower layer flow 25' and upper layer flow 26' which form the outer periphery of cavity 2j, the ceiling 2d of the horizontal pipe, and the outer casing 2b of the upper vertical pipe. The flow formed within the above-mentioned curved hollow pipe 2 is generated by individually adjusting the rotation angle α of the liquid injection site 1 within the range of 90°±45° and the rotation angle θ of the curved hollow pipe 2 within the range of 90°±45°.

[0047] The fourth invention will be described with reference to Fig. 3. When liquid 1e is injected from liquid injection port 1a of liquid injection portion 1 at injection angle α into inner wall position 14 of upper vertical pipe outer shell 2b of curved hollow pipe 2, the liquid 1e that impinges splits into a continuous flow and turns into a collection of liquid chunks. The liquid chunks that have turned into a collection of liquid chunks incorporate air in the space between them as air bubbles, and flow downward as reflected mixed flows 1h, 1i, and 1j. The mixed flows 1h, 1i, and 1j that have incorporated the air bubbles impinge on the liquid at position 15 and branch off to the left and right.

[0048] The flows branching off to the right will now be described. The upper layer flow 19, middle layer flow 20, and lower layer flow 21 flowing to the right collide with the inner wall of the upper vertical pipe outer shell 2a of the curved hollow pipe 2 at position 16 obliquely upward to the right, then change direction to an obliquely upward left and are released into space. The upper layer flow 19, middle layer flow 20, and lower layer flow 21 released into the space split into continuous flows, becoming upper layer flow 19', middle layer flow 20', and lower layer flow 21', which are discontinuous liquid masses, and the trapped air bubbles are released into the space. The air bubbles 40 released into the space fall into the lower cavity 2i due to the action of gravity.

[0049] Because the mass of the air bubbles is smaller than the mass of the liquid, the air bubbles 40 remain in the cavity 2i. The air bubbles continue to accumulate in the cavity 2i, and the air bubbles accumulating in the cavity 2i fill the cavity 2i. As the air bubbles continue to be discharged from the upper layer flow 19', the middle layer flow 20', and the lower layer flow 21' into the cavity 2i filled with air bubbles, the air bubbles accumulated in the cavity 2i are discharged toward and taken in by the mixed flows 1i, 1h, and 1j that form the outer periphery of the cavity 2i, and the upper layer flow 19, the middle layer flow 20, and the lower layer flow 21.

[0050] The supply of bubbles from cavity 2i to mixed flows 1i, 1h, 1j and to upper layer flow 19, middle layer flow 20, and lower layer flow 21 becomes continuous, promoting the mixing and stirring of the bubbles and liquid, increasing the contact area between the liquid and the bubbles, and dissolving a large amount of oxygen in the bubbles into the liquid of mixed flows 1i, 1h, 1j and to the upper layer flow 19, middle layer flow 20, and lower layer flow 21.

[0051] The flow branched off to the left will now be described. The upper layer flow 22, middle layer flow 23, and lower layer flow 24 flowing to the left flow inside the horizontal pipe, collide with the inner wall of the lower vertical pipe outer shell 2f, and branch off to become the lower layer flow 25 and upper layer flow 26 heading upward, which flow toward the horizontal pipe ceiling 2d of the curved hollow pipe 2. After colliding with position 18 of the horizontal pipe ceiling 2d of the curved hollow pipe 2, the lower layer flow 25 and upper layer flow 26 are discharged diagonally downward to the right into the space of the horizontal pipe 2. The lower layer flow 25 and upper layer flow 26 discharged into the space separate into continuous flows, becoming the lower layer flow 25' and upper layer flow 26' in which liquid masses are discontinuously connected, and air bubbles are discharged into the space.

[0052] The bubbles 41 and 42 released into the space fall into the cavities 2j and 2k due to the action of gravity. Because the mass of the bubbles is smaller than the mass of the liquid, the bubbles 41 and 42 remain in the cavities 2j and 2k. The bubbles continue to accumulate in the cavities 2j and 2k, and the bubbles that accumulate in the cavities 2j and 2k fill the cavities 2j and 2k.

[0053] As the air bubbles in the lower layer flow 25' and the upper layer flow 26' continue to be discharged into the cavities 2j and 2k filled with air bubbles, the air bubbles accumulated in the cavity 2j are discharged into the upper layer flow 22, the middle layer flow 23, the lower layer flow 24, which form the outer periphery of the cavity 2j, and the lower layer flow 25 and the upper layer flow 26. At the same time, the air bubbles accumulated in the cavity 2k are discharged into the mixed flows 1h, 1i, and 1j, which form the outer periphery of the cavity 2k, and into the upper layer flow 22, the middle layer flow 23, and the lower layer flow 24.

[0054] Bubbles are continuously supplied from cavity 2j to upper layer flow 22, middle layer flow 23, lower layer flow 24, and lower layer flow 25 and upper layer flow 26, which promotes mixing and stirring of the bubbles and liquid, increases the contact area between the liquid and the bubbles, and causes a large amount of oxygen in the bubbles to dissolve in the liquid of upper layer flow 22, middle layer flow 23, lower layer flow 24, and lower layer flow 25 and upper layer flow 26.

[0055] At the same time, air bubbles are continuously supplied from cavity 2k to mixed flows 1h, 1i, and 1j and to upper layer flow 22, middle layer flow 23, and lower layer flow 24, promoting mixing and stirring of the air bubbles and liquid, increasing the contact area between the liquid and the air bubbles, and dissolving a large amount of oxygen in the air bubbles into the liquid of mixed flows 1h, 1i, and 1j and the upper layer flow 22, middle layer flow 23, and lower layer flow 24.

[0056] The fifth invention will be described with reference to Fig. 2. In the fifth invention, the flow velocity V of the liquid 1e colliding with the inner wall position 14 of the outer wall 2b of the upper vertical pipe of the curved hollow pipe 2 is V=V0+Vt, which is the sum of the flow velocity V0 of the liquid 1e injected from the liquid injection port 1a of the liquid injection portion 1 and the vertical distance H3+H4 between the liquid injection port 1a and the inner wall position 14 of the outer wall 2b of the upper vertical pipe of the curved hollow pipe 2, and the free fall velocity Vt of the liquid 1e.

[0057] If the vertical distance H3+H4 between the liquid inlet 1a of the liquid injection portion 1 and the inner wall position 14 of the upper vertical pipe outer shell 2b of the curved hollow pipe 2 where the liquid 1e collides is increased, the time that the liquid 1e injected from the liquid inlet 1a of the liquid injection portion 1 takes to freely fall becomes longer, and the proportion of the free fall velocity Vt in the flow velocity V of the liquid 1e when it collides with position 14 increases.

[0058] By utilizing free fall due to the action of gravity to increase the flow velocity V when liquid 1e collides with inner wall position 14, the momentum defined as the product of liquid 1e and the flow velocity V of liquid 1e when liquid 1e collides with inner wall position 14 increases, and the impulse representing the impact force when liquid 1e collides with inner wall position 14 becomes larger. As a result, the amount of bubbles that can be generated by the collision of liquid 1e can be increased without using mechanical action, and the amount of oxygen dissolved from the bubbles in the liquid in the mixed flow flowing inside the curved hollow pipe can be increased with less energy. Effect of the Invention

[0059] First effect of the invention The liquid oxygen dissolver consists of a liquid injection section 1 and a curved hollow pipe 2. The liquid oxygen dissolver has a simple structure yet has superior dissolving performance compared to conventional aeration and fine bubble devices, making it possible to dissolve oxygen in large volumes of liquid with low energy. The pump that sends liquid to the liquid oxygen dissolver and the power supply that drives the pump are separate from the liquid oxygen dissolver.

[0060] Therefore, the liquid oxygen dissolving device has the effect of being able to inexpensively manufacture a liquid oxygen dissolving device of a size capable of supplying the oxygen required in large enclosed water areas such as reservoirs, dam lakes, lakes and marshes, coasts, etc. Also, if an existing water pump or the like is installed in the target location, simply by installing the device of the invention, oxygen can be dissolved in liquid without adding energy such as electricity.

[0061] Second Invention Effect The liquid oxygen dissolving device is composed of a liquid injection part 1 and a curved hollow pipe 2. The horizontal position L, vertical position H4, and rotation angle α of the liquid injection part 1, and the horizontal position x, vertical position y, and rotation angle θ of the curved hollow pipe 2 can be changed individually.

[0062] Even if either the liquid injection site 1 or the curved hollow pipe 2 is fixed, the position 14 and angle α at which the liquid 1e injected from the liquid injection port 1a of the liquid injection site 1 collides with the inner wall of the upper vertical pipe outer shell 2b of the curved hollow pipe 2 can be determined by adjusting the horizontal position, vertical position, and rotation angle of the other.

[0063] As a result, it is not subject to the restrictions imposed by existing facilities in reservoirs, dam lakes, lakes and marshes, coasts, etc. It can be installed on a raft or float and placed above the water surface. It is not subject to the restrictions of topography, such as reservoirs and dam lakes in mountainous areas, and can be installed halfway up a slope.

[0064] Third Invention Effect By setting the location and angle at which the liquid collides while flowing from the top to the bottom of the curved hollow pipe, the direction of the liquid flow can be changed and the flow of the liquid can be reversed, turning the space inside the curved hollow pipe into a cavity in which the inner wall of the curved hollow pipe and the flow of the liquid form the outer periphery. The above effect can be achieved by individually adjusting the rotation angle α of the liquid injection portion 1 within the range of 90°±45°, and the rotation angle θ of the curved hollow pipe 2 within the range of 90°±45°.

[0065] Fourth effect of the invention When liquid collides with a wall, the continuous flow is broken up, and the liquid mass turns into a collection of liquid globs. The gas in the space between the globs is trapped as gas bubbles, generating a mixed flow of liquid and gas bubbles.

[0066] The mixed flow is caused to collide with the wall, splitting the mixed flow into liquid mass and air bubbles, and then released into space, causing the bubbles to fall downward due to gravity acting on them. Taking advantage of the fact that the mass of the bubbles is smaller than that of the liquid, the air bubbles are accumulated in the cavity formed by the inner wall of the curved hollow pipe and the mixed flow, filling the cavity and causing the air bubbles in the cavity to move continuously into the mixed flow, increasing the contact area between the liquid and the bubbles and having the effect of promoting the dissolution of oxygen from the bubbles into the liquid in the mixed flow.

[0067] Fifth effect of the invention The flow velocity V of the liquid 1e colliding with the inner wall position 14 of the upper vertical pipe outer shell 2b of the curved hollow pipe 2 is V=V0+Vt, which is the flow velocity V0 of the liquid 1e injected from the liquid inlet 1a of the liquid injection part 1 plus the vertical distance H3+H4 between the liquid inlet 1a and the inner wall position 14 of the upper vertical pipe outer shell 2b of the curved hollow pipe 2, and the free fall velocity Vt of the liquid 1e. The action of gravity can be used to increase the flow velocity V of the liquid 1e, and the momentum defined as the product of the mass of the liquid 1e and the flow velocity V of the liquid 1e increases, increasing the impulse, which is the impact force when the liquid 1e collides with the inner wall position 14, and the amount of bubbles that can be generated by the liquid 1e colliding with the inner wall position 14, can be increased with less energy. As a result, there is an effect of reducing the energy required to dissolve oxygen in the liquid. [Brief description of the drawings]

[0068] [Figure 1] Cross section of bent hollow pipe [Diagram 2] Bent hollow pipe AA cross section and flow diagram [Diagram 3] Diagram of AA cross section of curved hollow pipe and air bubble accumulation caused by flow [Figure 4] Outer shape of a curved hollow pipe other than a circular outer shape according to the first embodiment [Diagram 5] A cross-sectional view of a horizontal pipe of a bent hollow pipe according to Example 2 and a diagram of liquid flowing through the horizontal pipe of the bent hollow pipe. [Figure 6] Schematic diagram of oxygen dissolution demonstration test device according to Example 3 [Figure 7] Specifications for the liquid oxygen dissolution demonstration test according to Example 3 [Figure 8] Result of oxygen dissolution demonstration test in Example 3 [Figure 9] Vertical layout diagram of the liquid oxygen dissolving device according to the fourth embodiment [Figure 10] Layout of liquid oxygen dissolving device according to the fifth embodiment [Figure 11] Radial layout of the liquid oxygen dissolving device according to the sixth embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0069] The following description will be given with reference to Figures 1 and 2. The case where the horizontal pipe outer shell 2' of the curved hollow pipe 2 is circular will be described. As shown in Figure 1, the horizontal pipe outer shell 2' of the curved hollow pipe may be continuously closed with an outward convex shape centered on point O. As shown in Figure 2, the central axis 1d of the liquid injection part 1 may be on the same plane as the cross section cut along the x-axis, and positions 14, 15, 16, 17, and 18 where the liquid 1e injected from the liquid injection port 1a of the liquid injection part 1 collides with the inner wall of the curved hollow pipe 2 during the flow of the liquid until it is discharged from the outlet of the lower vertical pipe of the curved hollow pipe 2 may be on the plane of the cross section cut along the x-axis.

[0070] Cases where the horizontal pipe outer periphery 5' of the curved hollow pipe 2 is other than the circle shown in Fig. 1 will be described with reference to Fig. 2 and Fig. 4. Fig. 4a shows a case where the horizontal pipe outer periphery 5' of the curved hollow pipe 2 is an ellipse, with its major axis on the x-axis and its minor axis coinciding with the y-axis. Position 5a corresponds to position 14 in Fig. 2 where liquid 1e collides. As shown in Fig. 2, the central axis 1d of the liquid injection portion 1 is in the same plane as the cross section cut along the x-axis, and positions 15, 16, 17, and 18 in Fig. 2 should be included within the plane of the cross section cut along the x-axis that includes position 5a.

[0071] Figure 4b shows a case where the horizontal pipe outer shape 6' of the curved hollow pipe 2 is an ellipse with its major axis on the y-axis and its minor axis coinciding with the x-axis. Position 6a corresponds to position 14 in Figure 2 where liquid 1e collides. As shown in Figure 2, the central axis 1d of the liquid injection portion 1 is in the same plane as the cross section cut along the x-axis, and positions 15, 16, 17, and 18 in Figure 2 should be included within the plane of the cross section cut along the x-axis that includes position 6a.

[0072] Figure 4c shows a case where the horizontal pipe outer periphery 7' of the bent hollow pipe 2 is formed by curves and straight lines, has an outwardly convex cross section centered on o, and the maximum length of the cross-sectional inner diameter coincides with the x-axis. Position 7a corresponds to position 14 where liquid 1e collides in Figure 2. As shown in Figure 2, the central axis 1d of the liquid injection portion 1 is in the same plane as the cross section cut by the x-axis, and positions 15, 16, 17, and 18 in Figure 2 may be included within the plane of the cross section cut by the x-axis including position 7a.

[0073] Figure 4d shows a case where the horizontal pipe outer periphery 8' of the curved hollow pipe 2 is formed by a straight line, the cross section is convex outwardly with o as the center, and the maximum length of the diagonal line connecting the vertices of the cross section coincides with the x-axis. Position 8a corresponds to position 14 where liquid 1e collides in Figure 2. As shown in Figure 2, the central axis 1d of the liquid injection part 1 is in the same plane as the cross section cut by the x-axis, and positions 15, 16, 17, and 18 in Figure 2 should be included in the plane of the cross section cut by the x-axis including position 8a.

[0074] The materials that can be used for the liquid injection part and the bent hollow pipe of the liquid oxygen dissolving device are metal, resin, vinyl, fiber reinforced plastic, glass, wood, and bamboo. Resin refers to highly plastic synthetic resin, and vinyl refers to polyvinyl chloride. EXAMPLES

[0075] The following will be explained with reference to Figure 5. Figure 5 shows the cross-sectional area 1b' of the liquid flowing through the horizontal pipe of the curved hollow pipe 2 relative to the cross-sectional area 1a' of the horizontal pipe of the curved hollow pipe 2. The best conditions for dissolving a large amount of gas into liquid while saving energy are shown in terms of the relationship between the cross-sectional area of ​​the horizontal pipe of the curved hollow pipe 2 and the cross-sectional area of ​​the liquid flowing in the horizontal pipe.

[0076] The best condition for dissolving a large amount of gas into a liquid while saving energy is that the ratio of the cross-sectional area 1b' occupied by the liquid flowing inside the horizontal pipe of the curved hollow pipe 2 to the horizontal pipe cross-sectional area 1a' of the curved hollow pipe 2 should be within the range of formula 1.

[0077]

number

[0078] The explanation will be given with reference to Figures 6 and 7. Figure 6 shows an overview of the liquid oxygen dissolving performance test using the liquid oxygen dissolving device. Figure 7 shows the specifications of the liquid injection part and the bent hollow pipe used in the liquid oxygen dissolving performance test. Dissolved oxygen sensor 36: Fluorescent DO electrode FDO925 Central Scientific Co., Ltd. Dissolved oxygen meter 37: Portable multi-purpose water quality meter Multi3510IDS Central Scientific Co., Ltd. Pump 28: Discharge volume 20L / min. Terada Pump Manufacturing Co., Ltd. The liquid oxygen dissolving performance test was carried out according to the following procedure, which will be explained with reference to Figure 6. Tap water was used as the liquid. 1. Collect 40 liters of tap water 35 in tank 34. 2. A curved hollow pipe 2 equipped with a pump 28 and a liquid injection portion 1 outside the tank 34 is installed on top of tank 34. A dissolved oxygen meter 37 and dissolved oxygen sensor 36 are installed to measure the oxygen saturation of tap water 35 in tank 34. The tip of dissolved oxygen sensor 36 is fixed at a position where oxygen-dissolved water 31 discharged from the opening of the vertical pipe below the bent hollow pipe falls into tap water 35 in tank 34. A pump 28 is connected to a pipe 32 connecting tap water 35 in tank 34. The pump 28 is connected to a pipe 29 that supplies water to liquid injection site 1. 3. Sodium sulfite is used to remove oxygen dissolved in the tap water 35 in the tank 34. By adding sodium powder, the amount of dissolved oxygen in the tap water 35 in the tank 34 is reduced to 0, i.e. That is, it is confirmed by using the dissolved oxygen meter 37 that the oxygen saturation level is 0. 4. Operate the pump 28 to supply tap water 35 from the tank 34 to the liquid injection site 1. Start water supply. The time elapsed (in minutes) is counted as 0 minutes, and the dissolved oxygen meter 37 Record the oxygen saturation. Check that the elapsed time (minutes) has reached 30 minutes. The pump 28 is stopped. The relationship between elapsed time (minutes) and oxygen saturation (%) is shown in the graph in Figure 8. From the results of the oxygen dissolving performance test, it was confirmed that the liquid oxygen dissolving device has the ability to dissolve oxygen. EXAMPLES

[0079] An explanation will be given with reference to Figure 9. Figure 9 shows a case where two liquid oxygen dissolvers are arranged vertically. If the vertical position y, horizontal position x, and rotation angle θ of the liquid oxygen dissolver arranged lower are adjusted so that flow 27 discharged from the lower opening of the lower vertical pipe of the liquid oxygen dissolver arranged upper collides with inner wall position 14 of the outer shell 2b of the upper vertical pipe of the liquid oxygen dissolver arranged lower at angle α, oxygen is dissolved in the liquid oxygen dissolver arranged upper, and further oxygen can be dissolved in flow 27 discharged from the lower opening of the lower vertical pipe of the liquid oxygen dissolver. EXAMPLES

[0080] The following description will be given with reference to FIG. 10. The upper part of FIG. 10 shows a side view of oxygen dissolvers arranged symmetrically around the axis nn, with four oxygen dissolvers arranged vertically on the left side and four on the right side, with the axis nn being the center. By arranging a total of eight oxygen dissolvers vertically as shown in FIG. 10 to form an assembly of liquid oxygen dissolvers, it is possible to create an assembly of liquid oxygen dissolvers that has a liquid oxygen dissolution capacity eight times that of the liquid oxygen dissolver, without making the liquid oxygen dissolver larger. With the above method, it is not necessary to change the specifications of the liquid oxygen dissolver according to the required amount of oxygen dissolved in the liquid. The number of units corresponding to the required amount of oxygen dissolved in the liquid can be determined based on the amount of oxygen dissolved in the liquid of one liquid oxygen dissolver, and the determined number of liquid oxygen dissolvers can be arranged vertically to form an assembly of liquid oxygen dissolvers. EXAMPLES

[0081] The following will be explained with reference to Figure 11. Figure 11 shows a case in which the line segment om is the central axis of the liquid oxygen dissolver r, and seven liquid oxygen dissolvers r are arranged by rotating the line segment om at 45 degrees counterclockwise around o, for a total of eight units. By arranging eight liquid oxygen dissolvers radially as shown in Figure 11 to form an assembly of liquid oxygen dissolvers, it is possible to create an assembly of liquid oxygen dissolvers that has eight times the amount of liquid oxygen that can be dissolved by one liquid oxygen dissolver, without making the liquid oxygen dissolvers larger.

[0082] With the above method, there is no need to change the specifications of the liquid oxygen dissolvers depending on the required amount of oxygen to be dissolved in the liquid. Instead, the number of liquid oxygen dissolvers corresponding to the required amount of oxygen to be dissolved in the liquid can be determined based on the amount of oxygen to be dissolved in the liquid of one liquid oxygen dissolver, and the determined number of liquid oxygen dissolvers can be arranged radially to create a liquid oxygen dissolver cluster. [Industrial Applicability]

[0083] The present invention has been made for the purpose of dissolving oxygen in the water of hypoxic water masses that occur in large enclosed water areas such as reservoirs, dam lakes, lakes and marshes, and coastlines, thereby improving water quality by activating the microorganisms living in the water, and maintaining or improving the environment necessary for the habitat of organisms such as aquatic plants and fish.

[0084] Since it is a device that dissolves oxygen in liquid, it can be used, for example, for the breeding and research of ornamental aquatic organisms, for commercial aquaculture, as an oxygen supply device for aeration tanks in wastewater and sewage purification facilities, as a device for dissolving oxygen in water used in greenhouse cultivation in the agricultural field, etc. Furthermore, if the liquid oxygen dissolver is made of glass, it can be used as an oxygen supply device required for microbial cultivation in laboratories and pharmaceutical manufacturing processes. [Explanation of symbols]

[0085] 1‥Liquid injection area 1a Liquid inlet 1b‥Lower central position of liquid injection site 1c‥Liquid injection site upper center position 1d‥Center axis of liquid injection area 1f‥Liquid injection area upper center position horizontal line 1e‥Liquid 1g‥Liquid collision position horizontal line α‥Liquid injection angle 1i. Mixed flow and peripheral flow 1h‥Mixed flow mainstream 1j‥Mixed flow peripheral flow 2. Bend hollow pipe 2a‥Upper vertical pipe outer shell 2b...Upper vertical pipe outer shell 2c: Bottom of horizontal pipe 2d‥Horizontal pipe ceiling 2e...Outer shell of lower vertical pipe 2F: Lower vertical pipe outer shell 2h: Horizontal line at position 4a θ‥The angle between the horizontal line 2h and the outer wall of the upper vertical pipe 2a 2i‥Cavity 2j‥Cavity 2k‥Cavity 3. Top of the inner wall of the upper vertical pipe 4. Inside of upper vertical pipe outer shell and horizontal pipe joint position 4a‥Outside of the upper vertical pipe outer shell and horizontal pipe joint position 5. Extend the bent hollow pipe position 12 vertically downward to contact the bottom of the horizontal pipe. position 6. Inside of the joint between the horizontal pipe and the lower vertical pipe 7. Bottom of the inner wall of the lower vertical pipe 8. Bottom of the inner wall of the lower vertical pipe 9. Extend horizontal pipe position 6 horizontally to the left and hit the inner wall of the lower vertical pipe. position 10. Inside of the joint between the lower vertical pipe and the horizontal pipe 11: The position where the lower vertical pipe position 6 is extended upward and hits the horizontal pipe 12. Inside of the joint between the horizontal pipe and the upper vertical pipe outer shell 13. Top of the inner wall of the upper vertical pipe 14. Liquid 1e collides with the inner wall of the upper vertical pipe 15. The position where the main mixed flow 1h collides with the bottom of the horizontal pipe. 16: The position where the underflow 21 collides with the inner wall of the upper vertical pipe outer shell 2a 17. The position where the mid-layer flow 23 collides with the inner wall of the lower vertical pipe outer shell 2f 18. The position where the underflow 25 hits the ceiling of the horizontal pipe 19. Upper current 20‥Middle flow 21‥Lower flow 19'...Upper layer current released into space 20' Mid-level flow released into space 21' Undercurrent released into space 22. Upper current 23‥Middle flow 24‥Lower flow 24': Flow separated from the underflow 24 24'' - Flow separated from the underlayer flow 24 25‥Lower flow 26. Upper current 25' Undercurrent released into space 26'...Upper layer current released into space 27...Flow discharged from the opening at the bottom of the lower vertical pipe of the curved hollow pipe 2 40. Air bubbles accumulating in cavity 2i 41. Air bubbles accumulating in cavity 2j 42. Air bubbles accumulating in cavity 2k L: Horizontal distance between the lower central position 1b of the liquid injection part and the inner wall of the upper vertical pipe outer shell 2b H3: Vertical distance between the collision position 14 of the liquid 1e on the inner wall of the outer casing 2b of the upper vertical pipe and the top 13 of the inner wall of the outer casing 2b of the upper vertical pipe H4: Vertical distance between the lower central position 1b of the liquid injection area and the inner wall top 13 of the upper vertical pipe outer shell 2b 2': Outer casing of horizontal pipe of curved hollow pipe 2 5'‥The outer periphery of the horizontal pipe of the elliptical bent hollow pipe 2 whose major axis coincides with the x-axis 5a‥Position where liquid 1e collides 6'‥The outer periphery of the horizontal pipe of the elliptical bent hollow pipe 2 whose minor axis coincides with the x-axis 6a‥Position where liquid 1e collides 7'‥In a bent section formed by a curve and a straight line, the maximum length of the section coincides with the x-axis. Horizontal pipe outer shell of empty pipe 2 7a‥Position where liquid 1e collides 8'‥Bent hollow pie with a cross section formed by straight lines and the maximum length of the cross section coincides with the x-axis Horizontal pipe outer shell of P2 8a‥Position where liquid 1e collides 1a': Inner cross-sectional area of ​​bent hollow pipe 1b' Cross-sectional area of ​​liquid flowing through the inner cross section of a curved hollow pipe 28. Pump 29... A water supply pipe connecting the pump 28 and the liquid injection portion 1 30. Tap water flowing through the water supply pipe 29 31. Tap water discharged from a curved hollow pipe 32. Water supply pipe connecting the tap water in the tank to the pump 33: Tap water flowing through the water supply pipe 32 34. Water tank 35. Tap water in water tank 34 36. Dissolved oxygen sensor 37. Dissolved oxygen measuring instrument H1: Length of vertical pipe above bent hollow pipe H2: Length of vertical pipe below bent hollow pipe D1: Diameter of vertical pipe above bent hollow pipe D2: Diameter of the vertical pipe below the bent hollow pipe D3: Diameter of horizontal pipe of bent hollow pipe B: Length of horizontal bent hollow pipe n: Vertically arranged central axis o‥Radial arrangement center point m‥Radial arrangement central axis r. Radial arrangement liquid oxygen dissolving device

Claims

1. A liquid oxygen dissolving device characterized by being composed of a bent hollow pipe equipped with a liquid injection portion.

2. 2. The liquid oxygen dissolving device according to claim 1, wherein the liquid injection portion is variable in horizontal position, vertical position, rotation angle, liquid injection flow rate, and liquid injection amount, and the bent hollow pipe has a bent portion and the horizontal position, vertical position, and rotation angle are variable.

3. a liquid inlet for injecting liquid into the upper vertical pipe and a liquid outlet for injecting liquid into the upper vertical pipe; a liquid outlet for injecting liquid into the upper vertical pipe and a liquid outlet for injecting liquid into the upper vertical pipe; a liquid outlet for injecting liquid into the upper vertical pipe and a liquid outlet for injecting liquid into the upper vertical pipe; a liquid outlet for injecting liquid into the upper vertical pipe and a liquid outlet for injecting liquid into the upper vertical pipe;

4. The liquid is collided with the inner wall of the outer shell of the upper vertical pipe of the curved hollow pipe, the liquid is split into a mass of liquid masses, the gas in the space inside the curved hollow pipe is captured as air bubbles within the mass of liquid masses, the liquid is changed into a mixed flow containing air bubbles, the mixed flow is collided with the inner wall of the curved hollow pipe, the direction of the mixed flow is changed and the mixed flow is released into the space, the mixed flow is split into liquid masses and air bubbles, the liquid masses and air bubbles fall downward due to the action of gravity, and only the air bubbles, which are smaller in mass than the mixed flow, are separated from the mixed flow and the outside of the curved hollow pipe. A liquid oxygen dissolving device characterized in that the inner wall of the housing causes bubbles to remain in the cavity that forms the outer periphery, filling the cavity with bubbles, and when the cavity is filled with bubbles, the bubbles that have accumulated in the cavity are supplied to the mixed flow flowing inside the curved hollow pipe, and bubbles are continuously supplied from the mixed flow to the cavity, causing the bubbles to move back and forth between the cavity and the mixed flow, promoting mixing and agitation of the bubbles and liquid in the mixed flow, and increasing the contact area between the bubbles and the liquid, thereby allowing the oxygen in the bubbles to efficiently dissolve in the liquid in the mixed flow.

5. This liquid oxygen dissolving device is characterized in that the free fall speed of the liquid from the liquid inlet to the time it collides with the inner wall of the outer casing of the upper vertical pipe of the curved hollow pipe can be added to the flow speed of the liquid injected from the liquid inlet at the liquid injection portion into the curved hollow pipe, thereby increasing the momentum of the liquid colliding with the inner wall of the outer casing of the upper vertical pipe of the curved hollow pipe, increasing the amount of bubbles generated by the liquid colliding with the inner wall of the outer casing of the upper vertical pipe of the curved hollow pipe, and increasing the amount of oxygen in the bubbles dissolved in the liquid in the mixed flow.

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