JP7316006B1 - Fluid mixing device - Google Patents

Abstract

Kind Code: A1 A fluid mixing device capable of finely mixing other fluid into a swirling fluid even when discharged into a medium different from the medium forming the swirling flow. SOLUTION: This fluid mixing device disperses and mixes a secondary fluid in a main fluid, and includes a main container having an inner wall surface having a circular vertical cross-sectional shape. A main fluid introduction port is provided for guiding the main fluid along the surface, and a secondary fluid introduction port is provided at one end of the main container for guiding the secondary fluid in the axial direction of the main container. and an outlet port for leading out the main fluid that has become a swirling flow in the main container is provided at the other end of the main container that is located on the side opposite to the side where the secondary fluid inlet port is provided, The fluid mixing device is provided with a pressure regulating section that forms a pressure barrier against the fluid to be discharged outside the outlet. [Selection drawing] Fig. 3

Description

The present invention relates to a fluid mixing device that mixes and derives two fluids, such as a microbubble generator that mixes liquid and gas.

Conventionally, a microbubble generator has been provided as a device for introducing gas into a liquid in a fine state, and a swirling microbubble generator has been provided as a device for stirring and mixing gas by a swirling flow of a liquid.

Regarding such a spinning microbubble generator, Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-88045) describes a spinning microbubble generator capable of arbitrarily controlling the shape of diffusing microbubbles in a liquid and the amount of microbubbles generated. A device has been proposed. That is, there has been proposed a swirling microbubble generator for leading out a swirling gas-liquid mixture containing microbubbles from an opening on the other end of a cylindrical container body, one end of which is closed by a wall and the other end of which is open. there is

Further, in Patent Document 2 (Japanese Patent Application Laid-Open No. 2012-239953), as a swirling microbubble generator that is downsized and simplified so that it can be applied to a small-scale water environment, a substantially spherical vessel having a hollow portion A swirling microbubble generator is proposed in which the gas that is self-sucked from the gas inlet is turned into microbubbles by the swirling flow of the liquid that flows into the gas-liquid outlet, and a swirling gas-liquid mixture containing microbubbles is discharged from the gas-liquid ejection port. It is

JP 2011-88045 A JP 2012-239953 A

As described above, there has been proposed a swirl-type microbubble generator in which gas is self-sucked from a gas inlet by a swirl flow of liquid to form microbubbles, and a swirling gas-liquid mixture containing microbubbles is drawn out. However, these swirling micro-bubble generators discharge the swirling gas-liquid mixture into the same liquid as the liquid that creates the swirling flow. For example, when it is drawn into the air, it is difficult to draw out a swirling gas-liquid mixture containing microbubbles.

Therefore, the present invention provides a fluid mixing device that can finely mix other fluids into the swirling fluid even when the fluid is discharged into a medium different from the medium that constitutes the swirling flow. is the subject.

Further, in the present invention, there is provided a fluid mixing device (that is, a microbubble generating device) capable of finely mixing a gaseous fluid such as air into a swirling liquid, particularly a gas-liquid mixing device containing microbubbles. To provide a fluid mixing device capable of discharging liquid into the air in the form of mist or droplets.

In order to solve at least one of the above problems, the present invention provides a fluid mixing device in which a pressure barrier is provided outside the outlet.
That is, in the present invention, a fluid mixing device for dispersing and mixing a secondary fluid in a main fluid is provided with a main container having an inner wall surface having a circular vertical cross-sectional shape, and the inner wall surface of the main container has a A main fluid introduction port is provided for guiding the main fluid along the peripheral surface, and a secondary fluid introduction port is provided at one end of the main container for guiding the secondary fluid in the axial direction of the main container. At the other end of the main container opposite to the side where the secondary fluid inlet is provided, an outlet port is provided for leading out the main fluid that has become a swirling flow within the main container. and a fluid mixing device provided with a pressure regulating portion forming a pressure barrier against the discharged fluid outside the outlet.

The main fluid may be water, liquid fuel such as gasoline, liquid such as alcohol, or gas such as air, propane gas, or hydrogen gas. The secondary fluid may be gas such as air, propane gas, or hydrogen gas, liquid fuel such as water or gasoline, or liquid such as alcohol. Here, it is desirable to use different states (liquid or gas) for the main fluid and the secondary fluid. For example, if the primary fluid is liquid such as water, the secondary fluid is preferably gas such as air. In addition, the main fluid and the secondary fluid may be in the same state (liquid or gas) as long as they are different from each other. For example, if the primary fluid is air (gas), the secondary fluid may be hydrogen gas (gas). .

If the main fluid is water and the secondary fluid is air, the fluid mixing device can be used as a microbubble generator, and the main fluid is liquid fuel such as gasoline and the secondary fluid is air. If so, the fluid mixing device can be used as a carburetor, an injector, or the like. Therefore, the fluid mixer according to the present invention can also be used for manufacturing various industrial products depending on the combination of the main fluid and the secondary fluid.

In the fluid mixing device of the present invention, the inner wall surface causes the guided main fluid to generate a swirling flow, and the subfluid is introduced from the subfluid inlet into the negative pressure cavity generated at the center of the swirling flow. Preferably, the secondary fluid is mixed into the main fluid at a vortex breakdown point where the pressure of the swirling flow is released, and the vortex breakdown point is located at or near the outlet. Further, the vortex breakdown point may exist inside or outside of the outlet by the length of the opening diameter. preferable.

The pressure barrier may function to control the location of the vortex breakdown point, wherein the pressure of the main fluid at the outlet is less than the pressure of the fluid present at the pressure regulator. is desirable.

In the fluid mixing apparatus according to the present invention, when the main fluid is liquid such as water and the secondary fluid is gas such as air, the pressure barrier can be formed as a liquid pool. In this case, the pressure adjustment section can be embodied as a space forming the liquid pool. The pressure adjusting unit includes a partition surrounding the outlet, a sprinkler plate provided with a plurality of openings and arranged opposite to the outlet, and an outer space provided radially outside the partition. It can also be composed of parts. By providing such an outer space portion, a swirl flow can be generated in the main fluid in which the secondary fluid is finely mixed, and the subfluid can be further miniaturized in the swirl flow.

Furthermore, as the pressure barrier, a member that resists the discharge of the main fluid containing the subfluid in a minute state can be used, such as a perforated plate or a mesh. The vortex breakdown point generation position can also be controlled by providing these members so as to close the outlet or by arranging them at a slight distance from the outlet.

The fluid mixing device of the present invention is a swirling flow type fluid mixing device, and is provided with a pressure adjusting section that forms a pressure barrier against the discharged fluid outside the mixed fluid outlet port. As a result, vortex breakdown due to pressure fluctuations in the swirling flow can be made to exist outside the outlet, and even if the vortex is discharged into a medium different from the medium that constitutes the swirling flow, A fluid mixing device is realized that can finely mix other fluids.

In particular, when the main fluid constituting the swirling flow is water and the secondary fluid is air, the microbubble generator can emit mist or droplets containing microbubbles into the air. .

(A) AA cross-sectional view, (B) Rear view, (C) C-C cross-sectional view, (D) Front view showing the microbubble generator according to the first embodiment 1 is an exploded sectional view of a microbubble generator according to a first embodiment; FIG. (A) End view showing the flow of fluid (water and air) in the microbubble generator according to the first embodiment, (B) Front view showing the flow of discharged microbubble-containing water. CC arrow end view showing the fluid mixing device according to the second embodiment CC arrow end view showing the fluid mixing device according to the third embodiment A longitudinal sectional view showing a fluid mixing device according to a fourth embodiment

Hereinafter, the fluid mixing device according to this embodiment will be specifically described with reference to the drawings. In particular, the present embodiment will be specifically described based on a so-called microbubble generator 10 using water as the main fluid and air as the secondary fluid. Therefore, the fluid mixing device will be described as the microbubble generator 10 below.

FIG. 1 shows the microbubble generator 10 according to the first embodiment (A) AA cross-sectional view, (B) rear view, (C) CC cross-sectional view, (D) front view 2 is an exploded cross-sectional view of the microbubble generator 10, and FIG. 3 is an XX end view showing the flow of (A) fluid (water and air) in the microbubble generator 10. , (B) is a front view showing the flow of discharged water mixed with microbubbles.

As shown in FIG. 1, the microbubble generator 10 according to the first embodiment is formed using a main container 11 in which a main fluid such as water and a secondary fluid such as air are guided. The main container 11 is hollow and has a spherical inner wall surface. As a result, as shown in FIG. 1, a conical internal space 12 is formed in the main container 11, which is tapered. However, the internal space 12 may also have a cylindrical shape, and can be formed in various shapes as long as the direction orthogonal to the axial direction is circular or elliptical. This is to generate a swirling flow in the main fluid introduced in the internal space 12 . In addition, on the rear end side of the internal space 12 of the main container 11, that is, on the inner surface of the side opposite to the outlet port 13, a hemispherical recess is annularly formed so as to surround the secondary fluid inlet port 15 described later. .

Further, the main container 11 is provided with a main fluid introduction port 14 for guiding the main fluid along its inner peripheral surface. Since the main fluid inlet 14 guides a fluid such as water along the inner wall surface of the main container 11, it is formed so as to guide the water tangentially to the inner wall surface. In the present embodiment, the main fluid inlet 14 is provided substantially in the center of the main container 11 in the longitudinal direction, but it can also be provided on the outlet 13 side or the rear end side. A secondary fluid introduction port 15 for taking in a secondary fluid such as air into the internal space 12 is provided on the rear end side wall surface of the main container 11 . Although the secondary fluid inlet 15 can be formed as a simple opening, it is desirable to form it in the shape of a nozzle protruding into the internal space as shown in FIG. By protruding into the internal space 12 in a nozzle shape, the secondary fluid can flow smoothly after being sucked.

At the tip side of the main container 11, an outlet port 13 for discharging the main fluid such as water introduced into the internal space 12 is provided. It is desirable that the opening diameter of the outlet port 13 is equal to or smaller than the opening diameter of the main fluid inlet port 14 .

A pressure barrier 16 that resists the flow of the main fluid discharged from the main container 11 is provided outside (that is, on the downstream side) of the outlet port 13 in the main container 11 configured as described above. Such a pressure barrier 16 is realized by a liquid reservoir 16 in the present embodiment, and a pressure adjusting section 17 for forming the liquid reservoir is provided outside the outlet port 13 . In the present embodiment, the pressure adjusting unit 17 includes a partition wall 18 surrounding the outlet 13, a sprinkler plate 19 having a plurality of openings and facing the outlet 13, and the partition 18. It is formed with an outer space portion 20 provided radially outwardly.

A spray plate 19 having a plurality of openings is arranged on the front side of the partition wall 18, that is, in the discharge direction of the main fluid in which the fine secondary fluid is dispersed and mixed. For the sprinkler plate 19 arranged opposite to the outlet 13, a punching metal having a plurality of openings may be used, or a mesh member may be used. The total opening area of the openings formed in the sprinkler plate 19 is desirably 50% or more and 200% or less, particularly 70% or more and 150% or less of the opening area of the outlet port 13 . This is because if it is less than 50%, it becomes difficult to smoothly discharge the main fluid in which the fine sub-fluid is dispersed and mixed, and if it exceeds 200%, it becomes difficult to secure the pressure barrier 16 . As shown in FIG. 2, the sprinkler plate 19 is arranged so as to face the outlet 13 of the main container 11, and is fixed to the main container 11 by a cylindrical holding member 21 having an inward flange. can do.

By providing the partition wall portion 18, an outer space portion 20 is formed radially outside thereof. The outer space portion 20 discharges the main fluid, which is discharged from the outlet port 13 and exists in the space (that is, the liquid pool 16) inside the sprinkler plate 19, into which the fine sub-fluid is dispersed and mixed. It functions as a space for stirring. That is, in the fluid mixing device according to the present embodiment, the liquid reservoir 16 and the outer space 20 are integrated and function as a stirring region of the main fluid in which the fine secondary fluid is dispersed and mixed. Problems of coupling or coalescence between secondary fluids can be eliminated.

FIG. 3 shows the flow of each fluid (in this embodiment, water and air) during operation of the fluid mixing device configured as described above. be. As shown in FIG. 3, the main fluid such as tap water guided from the main fluid inlet 14 flows along the inner space 12 of the main container 11 to form a spiral flow. The internal space 12 is tapered toward the outlet 13, and a negative pressure cavity is generated in the central portion of the main fluid such as water flowing along the inner wall surface. As a result, the secondary fluid such as air is sucked into the internal space (that is, into the negative pressure cavity) from the secondary fluid introduction port 15 . The main fluid, such as water, which forms a spiral flow, and the secondary fluid, such as air, guided to the negative pressure cavity, pass through the area tapered toward the outlet port 13 and exit the outlet port 13. In the region (that is, vortex breakdown point), the helical flow of the main fluid undergoes vortex breakdown and is mixed and agitated with the secondary fluid such as air. As a result, the sub-fluid, which has a lower specific gravity than the main fluid, is finely divided and dispersed and mixed in the main fluid. That is, in the present embodiment, the secondary fluid is made finer (microbubbles) at the downstream side of the outlet port 13 . This is because the pressure barrier 16 exists outside the outlet 13, and this is because the liquid pool is provided outside the outlet 13 in the present embodiment.

In the liquid pool 16, that is, the space secured inside the water sprinkling plate 19 outside the outlet 13, the water containing dispersed microbubbles discharged from the outlet 13 is spirally swirled and stirred. It is also stirred in the outer space 20 that is continuous with the liquid pool. By securing the pressure barrier (liquid pool 16), it is possible to prevent recombination of sub-fluid such as finely divided air.

The fine-bubble-dispersed water, which is causing the swirling flow, becomes the swirling flow even after passing through the sprinkler plate 19 . That is, as shown in FIG. 3(B), the water discharged from each opening of the sprinkler plate 19 forms a spiral. As a result, the water discharged from the fluid mixing device contains microbubbles, and since each of the water discharged from the opening holes has a spiral shape, the fluid mixing device can improve the dispersibility of the mixed liquid to be discharged. be able to.

Next, with reference to FIGS. 4 to 6, a fluid mixing device according to another embodiment will be specifically described. FIG. 4 is a CC arrow end view showing a fluid mixing device 30 according to the second embodiment, and in particular, the fluid mixing device omits the partition portion 18 of the first embodiment. That is, in the fluid mixing device 30 according to this embodiment, the main fluid and the sub-fluid discharged from the outlet port 13 are separated from each other by the pressure barrier (that is, the liquid pool 16) provided inside the spray plate 19. vortex breakdown occurs, whereby the secondary fluid is atomized and dispersed and mixed in the primary fluid.

FIG. 5 is a CC arrow end view showing a fluid mixing device 40 according to the third embodiment. It has a hemispherical shape. By curving the bottom surface of the outer space portion 20 in this manner, the flow of fluid can be made smooth without stagnating.

FIG. 6 is a longitudinal sectional view showing a fluid mixer 50 according to a fourth embodiment. The fluid mixing device 50 according to this embodiment uses a funnel-shaped main container 11 having a conical shape on the tip side, that is, on the outlet port 13 side, and the internal space 12 thereof also has a tapered shape. A wall surface on the rear end side is provided with a main fluid introduction port 14 for guiding the main fluid in the contact direction of the inner wall surface, and the rear end side is closed by a closing member 51 . Such a closing member 51 is formed by providing a semi-circular depression in an annular shape and providing the secondary fluid introduction port 15 in the central portion thereof. In addition, a sprinkling plate 19 is provided so as to close the discharge port 13 of the funnel-shaped main container 11 . The water spray plate 19 can be formed of a perforated plate or a mesh member, and is formed so as to resist at least the main fluid discharged from the outlet 13 .

That is, in the fluid mixing apparatus according to the fourth embodiment, the water spray plate 19 serves as a pressure barrier 16, and the presence of the pressure barrier 16 allows microbubbles in which the secondary fluid is finely mixed in the main fluid. Dispersion-containing water can be produced. Since no liquid pool is provided, the vortex breakdown point exists within or near the sprinkler plate 19 .

As described above, in the present embodiment, an example in which microbubble-dispersed water is produced using water as the main fluid and air as the secondary fluid has been described, but the primary fluid and the secondary fluid are not limited to these. Therefore, the fluid mixing device can be used as a mixing device for various fluids, such as a carburetor or an injector.

The fluid mixing device according to the present invention can be used not only as a microbubble generator but also for mixing various fluids, particularly for dispersing and mixing a secondary fluid into a main fluid.

10 Microbubble generator
11 Main vessel
12 Interior space
13 Outlet
13 Outlet
14 Main fluid inlet
15 Secondary fluid inlet
16 Pressure barrier (liquid pool)
17 Pressure regulator
18 Bulkhead
19 Sprinkler plate
20 Outer space
21 holding member
30,40,50 fluid mixer
51 Closure member

Claims (6)

A fluid mixing device for dispersing and mixing a secondary fluid into a main fluid,
A main container having an inner wall surface with a circular vertical cross-sectional shape,
The inner wall surface of the main container is provided with a main fluid inlet for guiding the main fluid along the inner peripheral surface, and a sub-fluid inlet is provided at one end of the main container in the axial direction of the main container. A secondary fluid inlet is provided to guide the fluid,
At the other end of the main container on the side opposite to the side where the secondary fluid inlet is provided, an outlet port is provided for leading out the main fluid that has become a swirling flow in the main container,
A pressure regulating portion is provided outside the outlet port to form a pressure barrier against the fluid to be led out ,
The pressure adjusting unit includes a partition surrounding the outlet, a sprinkler plate having a plurality of openings and arranged opposite to the outlet, and an outer space provided radially outside the partition. A fluid mixing device comprising :
The inner wall surface causes a swirling flow in the guided main fluid, and introduces the secondary fluid from the secondary fluid inlet into a negative pressure cavity generated at the center of the swirling flow,
the secondary fluid mixes into the main body at a vortex breakdown point where the pressure of the swirling flow is released;
2. The fluid mixing device of claim 1, wherein said vortex breakdown point is at said outlet.
the primary fluid is a liquid and the secondary fluid is a gas;
3. The fluid mixing device according to claim 1, wherein said pressure barrier is a liquid reservoir, and said pressure adjustment section is a space forming said liquid reservoir.
the outer space portion is connected to a liquid pool secured inside the water spray plate outside the outlet and causes the fluid discharged from the outlet to swirl and agitate;
3. The fluid mixing device according to claim 1 , wherein a vortex breakdown point at which pressure of said swirling flow is released exists in a region between said outlet and a sprinkler plate .
3. The fluid mixing device according to claim 1 , wherein the total opening area of the plurality of openings provided in the sprinkler plate is 50% or more and 200% or less of the opening area of the outlet.
The outlet opening diameter is equal to or smaller than the opening diameter of the main fluid inlet,
2. The fluid mixing device according to claim 1, wherein the total opening area of the openings formed in the sprinkler plate is 50% or more and 200% or less of the opening area of the outlet.