JP2012239953A - Revolving type fine air bubble generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize and simplify a revolving type fine air bubble generator for clarifying a liquid such as water by introducing and dissolving gas such as air therein so as to be applicable to a small-scale water environment.SOLUTION: In the revolving type fine air bubble generator including a roughly spherical container with a hollow part rotationally symmetrically formed, a gas introducing port in which an external wall on one side on the rotationally symmetric axis of the container is projected in a roughly conical trapezoid into the hollow part along the rotationally symmetric axis and set up, a gas and liquid jetting port set up on the external wall on another side on the rotationally symmetric axis, and a pressurized-liquid introducing port perpendicularly set up to the rotationally symmetric axis in the vicinity of the gas and liquid jetting port, the gas self-fed from the gas introducing port by the revolving flow of the liquid flowing into the container is made fine bubbles, and a revolving gas and liquid mixture containing the fine bubble is discharged from the gas and liquid jetting port.

Description

  The present invention relates to a fine bubble generating apparatus for efficiently dissolving a gas such as air or gas in water, other liquids, etc., for example, purifying water quality and reviving a water environment.

  Various types of microbubble generators are known, but there is a gas-liquid shearing system as a system that can stably generate a large amount of microbubbles with a relatively simple and small-scale apparatus. This gas-liquid shear method generates a high-speed vortex in a gas-liquid two-phase fluid, and a swirling cavity (hereinafter referred to as a “negative pressure cavity”) consisting of a negative pressure gas at the center of the vortex due to centrifugal separation of the liquid flow. The gas is sheared and refined by the difference in swirling speed between the liquid high-speed vortex and the negative pressure cavity.

As prior art of such a gas-liquid shearing type fine bubble generator, as disclosed in Patent Document 1 (Japanese Patent No. 3397154) and Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-116365), a cylindrical opening is used. The basic technique is to introduce a pressurized liquid into the inside of the container to generate a high-speed vortex, and to self-suck gas from the outside by the negative pressure of the negative-pressure cavity generated by the high-speed vortex to form fine bubbles.
Japanese Patent No. 3397154 JP 2006-116365 A

The inventor of the present invention has proposed the invention described in Patent Document 3 (Patent No. 4621796). That is, a gas-liquid jet is provided in the wall on one end of the cylindrical container with both ends closed, and the wall on the other end has a gas self-priming port and moves back and forth along the axial direction of the cylindrical container. By enabling this, the diffusion shape of the generated fine bubbles can be controlled, and a new gas-liquid shearing type fine bubble generator (hereinafter referred to as “swivel type fine bubble generator”) will be described. ).
Japanese Patent No. 4621796

On the other hand, in the swirl type fine bubble generator, the liquid and the gas are mixed in advance instead of separately introducing the liquid and the gas into the container as in the invention described in Patent Document 4 (Japanese Patent No. 3682286). An invention has also been proposed in which the gas-liquid mixed liquid is introduced in the state. The invention makes the shape of the vessel spherical, hemispherical, or various combinations of them, and in each vessel, a high-speed eddy current is generated in the vessel by the gas-liquid mixture introduced from a single inlet In addition, the microbubbles are ejected while taking in the liquid from one or two gas-liquid ejection openings opened in the liquid in which the container is immersed.
Japanese Patent No. 3682286

  By the way, as described above, the microbubble generator is intended to efficiently dissolve the gas into a liquid by making the gas into microbubbles, and can be used in large-scale water environments such as lakes, ponds, rivers, and the ocean. It is also applied to relatively limited small-scale water environments such as water tanks and waterworks. When applied to the former, the fine bubble generator and its associated equipment may be relatively large and complex, but when applied to the latter, a structure that is as small and simple as possible is required.

  As in the invention described in Patent Document 4, the method of introducing the gas-liquid mixture into the fine bubble generator can introduce a large amount of gas, and the gas-liquid mixing ratio can be controlled to a predetermined value in advance. It has advantages when envisioned for environmental applications. However, this method requires a separate device for controlling the mixing ratio of the gas and liquid, so it is difficult to reduce the size of the entire device including the incidental equipment. For example, a household water purifier or a shower head There is a problem that it is difficult to apply to a small-scale water environment, such as incorporation into a small water environment.

  In this method, the gas-liquid mixture must be swirled at a particularly high speed in order to generate fine bubbles after separating the mixed gas and liquid. Need to be pumped into the container. For this reason, an external pump is indispensable, which also becomes an obstacle to miniaturization.

  On the other hand, in the inventions described in Patent Documents 1 to 3, it is not necessary to preliminarily mix the gas and liquid. As long as the liquid introduced into the container generates a vortex with sufficient efficiency, the negative pressure of the negative pressure cavity is reduced. As a result, the gas is self-primed. The liquid and the gas are not mixed, and the gas is sheared at the tip of the fine bubble generation point of the negative pressure cavity formed by the self-sucked gas, and the fine bubble is generated. For this reason, not only can the apparatus itself be miniaturized, but, for example, if a high-speed eddy current can be generated by the water pressure of the water supply, even a pump is unnecessary, and it is easy to incorporate it into the aforementioned household items.

Thus, when considering application to a small-scale water environment, the method of introducing gas and liquid separately is more compact and simpler than the method of introducing a gas-liquid mixture. Therefore, it can be said that it is more suitable.

By the way, in the swirl type fine bubble generator, as described above, the gas introduced into the container forms a negative pressure cavity due to the high-speed vortex of the liquid, and is generated at the boundary between the gas and the liquid, particularly at the tip of the negative pressure cavity. At the microbubble generation point, the gas is continuously sheared due to the difference in swirling speed between the gas and the liquid, thereby generating microbubbles.

Here, as the swirling speed of the liquid vortex increases, the negative pressure in the negative pressure cavity increases and the amount of gas self-priming per unit time increases. Therefore, in order to efficiently generate a large amount of fine bubbles, it is desirable that the inside of the container has a structure capable of increasing the swirling speed of the vortex without applying high pressure to the liquid to be introduced.

In addition, since the difference in swirling speed between gas and liquid produces a shearing effect, in the negative pressure cavity, the shearing effect increases as the swirling speed rapidly increases from the gas inlet side toward the fine bubble generation point side, The generated bubbles can be further refined. That is, it is desirable that the cross-sectional area of the negative pressure cavity is large to some extent immediately after the gas is introduced into the container, and then rapidly decreases toward the point where the fine bubbles are generated at the tip.

In the fine bubble generating devices disclosed in Patent Documents 1 to 3, the inside of the container is basically a cylindrical space, and the inside is naturally filled with a liquid in which the fine bubble generating device is immersed. Therefore, regardless of whether the pressurized liquid inlet is installed on the gas inlet side or the gas liquid outlet side, the swirling speed of the liquid is increased between the vicinity of the pressurized liquid inlet and the opposite side due to the inertia of the liquid itself. In order to make a difference, it is difficult to sufficiently increase the swirling speed of the vortex flow as a result when the pressure is relatively small, regardless of whether the liquid is pumped at a large pressure.

In addition, Patent Documents 1 and 2 also show a diagram of a fine bubble generating device in which the inside of the container has a substantially conical shape, but in this case as well, the difference in the amount of liquid swirling between the substantially conical base and top Therefore, there is a problem that the swirling speed of the vortex cannot be sufficiently increased with a relatively small pressure.

In view of the above, in the swirl type fine bubble generator, particularly the fine bubble generator adopting the method of introducing gas and liquid separately on the premise of application to a small-scale water environment, the pressure for pumping the liquid is small. However, it was necessary to further improve the internal shape of the container in order to increase the speed of the liquid vortex and generate a large amount of sufficiently fine bubbles.

  In order to solve the above-described problems, a swirling fine bubble generator according to the present invention has the following configuration.

  That is, the swirling fine bubble generator according to claim 1 of the present invention includes a substantially spherical container having a hollow portion formed in a rotational symmetry, and an outer wall on one side of the rotational symmetry axis of the container. In the vicinity of the gas / liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the rotational symmetry axis, a gas / liquid jet port opened on the other outer wall on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by microbubbles the gas that is sucked from the gas inlet by the swirling flow of the liquid that has flowed into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially spherical shape and the hollow portion filled with the liquid has also a substantially spherical shape, when the liquid in the hollow portion is swirled at high speed, the friction between the liquid and the wall can be minimized, Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently. In addition, since the pressurized liquid inlet is opened in a direction perpendicular to the rotational symmetry axis, the swirl axis of the liquid vortex generated in the hollow portion can coincide with the rotational symmetry axis of the container. Thereby, the eddy flow of the liquid in a hollow part becomes smooth.
(2) The liquid press-fitted from the pressurized liquid inlet immediately starts swirling along the curved surface of the inner wall of the hollow part, but the pressurized liquid inlet is provided on one side of the rotational symmetry axis of the vessel Since the liquid is provided near the jet outlet, the liquid turns along the inner wall of the hollow part toward the gas inlet on the opposite side (outward path), reverses in the vicinity of the gas inlet, and then returns along the rotational symmetry axis (return path). Finally, it is discharged from the gas-liquid jet outlet to the outside of the body.
(3) Since the swirl radius of the liquid is small in the vicinity of the pressurized liquid inlet and the friction with the liquid already existing in the hollow portion is small, the liquid is discharged at a relatively small pressure compared to the case where the hollow portion is cylindrical. Even if it is introduced, a vortex can be efficiently generated.
(4) The liquid proceeds to the gas inlet side while swirling, but naturally the swirl radius of the liquid increases near the center of the hollow portion, and thus the traveling speed of the vortex flows temporarily decreases. On the other hand, since the centrifugal force increases, a negative pressure is generated on the rotationally symmetric axis, and the negative pressure causes a gas to be self-sucked from the gas inlet into the hollow portion to form a negative pressure cavity.
(5) When the vortex flows further in the direction of the gas inlet, the swirl radius of the liquid becomes smaller again, so the liquid swirl speed naturally increases, and the negative pressure cavity portion immediately after being formed near the gas inlet is negative. Since the pressure also increases, the gas is more efficiently self-primed into the hollow portion.
(6) In the process of the return path after the reversal of the vortex flow, the liquid travels along the outer axis along the axis of rotational symmetry. At this time, since the turning flow of the forward path occupies the outer peripheral side, the turning radius does not increase and passes through the center of the hollow portion while maintaining the turning speed. As the gas-liquid jet port is approached, the turning radius is further reduced and the turning speed is further increased. Therefore, the negative pressure cavity is compressed from the surrounding vortex and is tapered conically.
(7) Since the gas self-primed from the gas inlet into the negative pressure cavity has a specific gravity smaller than that of the liquid, the swirling speed is lower than the swirling speed of the liquid in contact. For this reason, a shearing effect is generated at the gas-liquid contact surface due to the difference in swirling speed between the two, and the gas becomes a fine bubble at a fine bubble generation point generated at a tip portion where the negative pressure cavity portion is tapered in a conical shape. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(8) In the present invention, since the gas inlet port is opened in the hollow portion so as to protrude in a substantially frustoconical shape, when the vortex reaching the inner wall of the hollow portion on the gas inlet side is reversed, Guided along the side. For this reason, the liquid easily recirculates along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(9) When the gas inlet is directly opened on the inner wall of the hollow portion, the shape of the negative pressure cavity portion becomes unstable due to the turbulent flow generated when the vortex flow of the liquid is reversed, and as a result, the fine bubbles at the microbubble generation point Bubble generation is also unstable. In the present invention, since the gas introduction port opens at the top of the substantially truncated cone shape, the self-sucked gas is discharged into the hollow portion at a position closer to the center than the inner wall of the hollow portion. Therefore, the influence of the turbulent flow on the negative pressure cavity can be prevented, and the efficiency of generating fine bubbles can be increased.

  As described above, by making the vessel body and the hollow part into a substantially spherical shape, a higher-speed liquid vortex can be generated even when the liquid is introduced at a relatively small pressure compared to the case of the conventional cylindrical shape. . As a result, since the negative pressure of the negative pressure cavity portion also increases, the amount of gas self-priming per unit time can be increased, and a larger amount of fine bubbles can be generated more efficiently. Also, by providing the gas inlet at the top of the substantially frustoconical shape protruding into the hollow part, the flow of liquid in the hollow part can be smoothed and the shape of the negative pressure cavity part can be stabilized, so the generation efficiency of fine bubbles is increased. It can be done.

  In addition to a perfect spherical shape, the entire length in the rotationally symmetric axis direction may be shorter than the maximum diameter of the outer periphery of the vessel, and may be a spherical shape that is compressed in the rotationally symmetric axis direction as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 2 of the present invention is the swirl type fine bubble generator according to claim 1, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  With this configuration, the reversal of the liquid vortex near the gas inlet can be further smoothed. The liquid in the hollow part swirls smoothly along the inner wall of the substantially spherical hollow part, but at the time of inversion, a turbulent flow is generated at the base of the gas inlet protruding in a substantially frustoconical shape, disturbing the swirling of the liquid in the hollow part. There is a fear. By making the substantially frustoconical side surface of the gas inlet into a curved surface integrated with the inner wall surface of the hollow portion, the occurrence of turbulence itself can be more effectively prevented.

  Next, a swirl type fine bubble generator according to claim 3 of the present invention is the swirl type fine bubble generator according to claim 1 or 2, wherein the gas inlet has the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  By providing the gas introduction pipe with the gas introduction port, the position for introducing the gas into the hollow portion can be arbitrarily changed. When only the position of the gas inlet is moved back and forth along the rotational symmetry axis while fixing other implementation conditions, the amount of fine bubbles generated decreases as the gas inlet is closer to the center of the hollow part, and vice versa. Increases the amount of microbubbles generated. When the position of the gas inlet is brought closer to the center of the hollow portion, the total length of the negative pressure cavity portion is shortened, and the amount of gas reaching the fine bubble generation point per unit time is increased. If the swirl speed of the liquid is constant, the efficiency of the shear effect at the microbubble generation point is also constant, so if the amount of gas is too large, excess gas will not be made into microbubbles but will be released from the gas-liquid jet outlet as large bubbles. As a result, the amount of fine bubbles generated is reduced. On the contrary, if the gas inlet is close to the inner wall of the hollow part, the total length of the negative pressure cavity part becomes long, and the gas that has reached the fine bubble generation point is made into fine bubbles, so the amount of fine bubbles generated increases. It is.

  Thus, as in the invention described in Patent Document 4, in the present invention, the gas inlet tube is simply and mechanically introduced without adopting a method of introducing a gas-liquid mixed liquid in which the mixing ratio of gas and liquid is adjusted in advance. By changing the amount of protrusion into the hollow portion, the amount of fine bubbles generated can be easily controlled. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  Furthermore, since the gas introduction pipe is a component independent of the gas introduction port provided in the container, it can be removed and cleaned as appropriate. The main body has a total of three openings: a liquid inlet, a gas-liquid jet, and a gas inlet. During operation of the device, the liquid inlet and the gas-liquid jet do not add liquid or gas-liquid mixture. Therefore, if a filter or the like is provided in the liquid flow path leading to the liquid inlet, large foreign objects can be prevented from entering, and foreign objects smaller than the inner diameter of the gas-liquid jet outlet can be discharged naturally outside the body by the liquid pressure. Is done. On the other hand, the gas flow path leading to the gas inlet has a structure in which atmospheric pressure gas is self-primed by the operation of the apparatus. For this reason, even if large foreign matters can be removed by a filter, it is not appropriate to provide a filter that can remove even small foreign matters in order not to reduce the intake efficiency. As a result, since the gas self-priming pressure is much smaller than the liquid introduction pressure, small foreign substances in the gas are likely to remain at the gas introduction port, which may cause clogging. However, if the gas inlet is configured as a gas inlet pipe as an independent part, remove only the clogged gas inlet pipe from the body as necessary, and clean the inside of the pipe or replace the gas inlet pipe itself This has the advantage that it can be easily handled.

  Next, a swirl type fine bubble generator according to claim 4 of the present invention is rotationally symmetric between a substantially hemispherical container having a hollow portion formed in a rotational symmetry and an outer wall on the bottom side of the substantially hemispherical surface of the container. In the vicinity of the gas-liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the axis, a gas-liquid jet port opened on the outer wall on the substantially hemispherical top side on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by making the gas flowing from the gas inlet into a fine bubble by the swirling flow of the liquid self-sucked into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially hemispherical shape, and the hollow portion filled with the liquid also has a substantially hemispherical shape, the friction between the liquid and the wall body can be minimized, as in the case of the substantially spherical body. Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently.
(2) Moreover, since the total amount of liquid in the hollow portion is smaller than in the case of a substantially spherical body and the inertia of the swirling liquid is smaller, the swirling speed of the vortex can be further increased even when the liquid introduction pressure is the same. The amount of gas that is self-primed per unit time can be increased.
(3) Since the hollow portion has a substantially hemispherical shape, the position of the gas introduction port is close to the gas-liquid jet port facing the inside of the hollow portion, so that the overall length of the formed negative pressure cavity portion is also shortened. As a result, the cross section of the negative pressure cavity portion decreases rapidly from the vicinity of the gas inlet toward the tip of the negative pressure cavity portion. As a result, the swirling speed of the liquid vortex at the microbubble generation point generated at the tip of the negative pressure cavity is also rapidly increased, and the shear efficiency of the gas is improved, so that smaller microbubbles can be generated. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(4) Since the gas introduction port is formed in the hollow portion so as to protrude in a substantially frustoconical shape, as in the invention described in claim 1, the flow of the liquid reaching the hollow portion inner wall on the gas introduction side is reversed. In this case, the liquid is guided by the substantially frustoconical side surface and is easy to recirculate along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(5) On the other hand, unlike the invention according to claim 1, the hollow part is substantially hemispherical and has the maximum radius near the gas inlet, so that when the liquid is reversed, the hollow part is substantially spherical. Although the swirling speed does not increase as much as the case, since the outer diameter of the hollow portion is reduced immediately after reversal, the effect of increasing the swirling speed of the liquid toward the tip of the negative pressure cavity is the same.
(6) As a result, the cross section of the negative pressure cavity is rapidly reduced at a short distance along the rotational symmetry axis, and the shear efficiency of the gas at the microbubble generation point at the tip is increased.

  In addition to the hemispherical shape of the vessel, the overall length in the rotationally symmetric axis direction may be further shortened to have a convex lens shape as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 5 of the present invention is the swivel type fine bubble generator according to claim 4, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  In the swirl type fine bubble generator according to claim 4, since the cross-sectional area of the hollow portion is the maximum around the gas inlet as described above, there is a possibility that turbulence will occur at the time of reversal of the swirl flow of the liquid. Although it is smaller than the swirl type fine bubble generator according to the above, by making the substantially frustoconical side surface of the gas introduction port a curved surface integrated with the inner wall surface of the hollow portion, the generation of this turbulent flow can be prevented more effectively. it can.

  Next, the swirl type fine bubble generator according to claim 6 of the present invention is the swirl type fine bubble generator according to any one of claims 4 and 5, wherein the gas inlet is the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  Similarly to the swirling fine bubble generator according to the third aspect, by moving the gas introduction tube along the rotational symmetry axis, the position for introducing the gas into the hollow portion can be arbitrarily changed. Thus, the present invention simply and mechanically changes the amount of protrusion into the hollow portion of the gas introduction tube without adopting a method of introducing a gas-liquid mixture whose gas / liquid mixing ratio has been adjusted in advance. Thus, it becomes possible to easily control the generation amount of fine bubbles. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  According to the present invention, it is possible to realize a swivel type microbubble generator that can efficiently generate microbubbles with a small and simple structure. In this swirling microbubble generator, the gas is automatically sucked into microbubbles by pumping the liquid into the container by an external pump. In particular, when the vessel body is extremely small, it can be operated even at a pressure about the water pressure of tap water, for example, and can be easily incorporated into household equipment such as a water purifier and a shower head. Therefore, this invention has the effect that the application range in a small-scale water environment can be expanded in a turning type fine bubble generator.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a swirling fine bubble generator according to a first embodiment of the present invention. The substantially spherical vessel 10 having a hollow inside has a gas-liquid jet 12 and a gas introduction pipe 13 at a position facing the rotational symmetry axis of the outer wall thereof, and is rotationally symmetric in the vicinity of the gas-liquid jet 12. A pressurized liquid introduction pipe 14 is connected in a direction perpendicular to the axis. FIG. 2 is a front view of the substantially spherical vessel 10 viewed from the gas-liquid jet 12 side.

FIG. 3 is a cross-sectional view of the swirling fine bubble generating device of FIG. The inside of the vessel body 10 is hollow, and the inner wall of the hollow portion forms a smooth spherical inner surface except for the vicinity of the gas inlet 16. On the other hand, the gas introduction port 16 has a substantially truncated cone shape protruding into the hollow portion along the rotational symmetry axis X, and the substantially truncated cone side surface forms a smooth curved surface 16 integrally with the spherical inner surface. Moreover, the gas introduction pipe | tube 13 is provided in the form which penetrates the gas introduction port 11 from the exterior of the container body 10. FIG. The pressurized liquid introduction pipe 14 is connected in the vicinity of the opening of the inner wall of the hollow part of the gas-liquid jet port 12 in the direction perpendicular to the rotational symmetry axis X, and forms a pressurized liquid inlet 15 on the inner wall of the hollow part. Yes.

Prior to the operation of the swirling fine bubble generating device, the hollow portion is filled with a liquid in which the device itself is immersed. When the device is operated, the liquid L fed from the pressurized liquid introducing pipe 14 is introduced into the pressurized liquid. It is newly introduced into the hollow portion through the mouth 15.

The introduced liquid L immediately swirls along the inner wall of the hollow portion, proceeds in the direction of the gas inlet 11 (leftward in FIG. 3), and generates a vortex R. The swirl R swirls with a small radius near the pressurized liquid inlet 15, but swirls with a maximum radius near the center of the hollow portion, and swirls again with a small radius near the gas inlet 11.

The vortex flow R that has reached the curved surface 16 is reversed along the curved surface 16 and proceeds in the right direction along the rotational symmetry axis X while forming a return vortex flow R 'inside the forward vortex flow R. The swirl of the vortex R ′ is in the same direction as the vortex R, but the radius is small, so the swirl speed is larger than that of the vortex R. Therefore, a negative pressure is generated in the liquid L in the hollow portion along the rotational symmetry axis X, and the gas A is sucked into the hollow portion from the gas introduction pipe 13 by the negative pressure, and the negative pressure is generated along the rotational symmetry axis X. A cavity V is generated.

The gas A forming the negative pressure cavity V is rotated by friction with the vortex flow R ′ and proceeds to the right while swirling, but the swirl radius of the vortex flow R ′ becomes smaller as it approaches the gas-liquid jet port 12. Since the turning speed is also increased, the negative pressure cavity V becomes a tapered conical shape. On the outer surface of the negative pressure cavity V, the swirling speed of the gas A is smaller than the swirling speed of the liquid L due to the difference in specific gravity between the gas A and the swirling liquid L ′. A shear effect is generated with respect to the gas A, and a fine bubble generation point P is generated at which the gas A is continuously sheared at the tip of the negative pressure cavity V to form fine bubbles.

Thereafter, the vortex flow R ′ becomes a gas-liquid mixed liquid state containing the fine bubbles MB and is discharged from the gas-liquid jet 12 to the outside of the container, and the fine bubbles MB are diffused into the external liquid.

FIG. 4 is a side view of the swirling fine bubble generating device according to the second embodiment of the present invention. A substantially hemispherical container body 20 having a hollow inside has a gas-liquid jet port 22 and a gas introduction pipe 23 at a position facing the rotational symmetry axis X of the outer wall, and in the vicinity of the gas-liquid jet port 22. A pressurized liquid introduction tube 24 is connected in a direction perpendicular to the rotational symmetry axis X.

FIG. 5 is a cross-sectional view of the swivel type fine bubble generator of FIG. 4 taken along the rotational symmetry axis X. The inside of the vessel body 20 is hollow, and the inner wall of the hollow portion forms a smooth hemispheric inner surface with the gas-liquid jet port 22 at the top, but the gas inlet 21 side is a circular wall body that blocks the bottom surface of the hemisphere. 27. On the other hand, the gas introduction port 21 has a substantially truncated cone shape that protrudes from the wall body 27 into the hollow portion along the rotational symmetry axis X, and smoothly curves from the inner wall of the hollow portion to the side surface of the substantially truncated cone shape through the wall body 27. A surface 26 is formed. Further, a gas introduction pipe 23 is provided so as to penetrate the wall body 27 and the gas introduction port 21 from the outside of the vessel body 20. Further, the pressurized liquid introduction pipe 24 is connected in the vicinity of the opening of the inner wall of the hollow portion of the gas-liquid jet port 22 in the direction perpendicular to the rotational symmetry axis X, and the pressurized liquid inlet 25 is formed in the inner wall of the hollow portion. doing.

  Also in this embodiment, the liquid L pumped from the pressurized liquid introduction pipe 24 by operating the apparatus is newly introduced into the hollow portion through the pressurized liquid introduction port 25, and the generated vortex R swirls in the left direction in the figure. However, the process of proceeding is the same as in the first embodiment.

  In the present embodiment, when the hollow portion has the maximum radius, the vortex flow R reaches the wall body 27, is reversed along the curved surface 26 to become the vortex flow R ′, and the inside of the vortex flow R along the rotational symmetry axis X is aired. It proceeds toward the liquid spout 22. Since the swirl radius is not reduced as in the first embodiment before the vortex R is reversed, the generation of turbulent flow in the vicinity of the gas inlet 21 is suppressed.

  In this embodiment, since the hollow portion is substantially hemispherical and has a short length in the direction of the rotational symmetry axis X, the swirl radius of the vortex R ′ after reversal becomes smaller at a shorter distance than in the first embodiment. As a result, the total length of the generated negative pressure cavity V is also shortened, and the cross-sectional area is narrowed more rapidly than in the first embodiment. Therefore, the swirling speed of the vortex R 'around the negative pressure cavity V is also increased more rapidly than in the first embodiment, and the shear effect on the gas A is sufficiently high at the fine bubble generation point P.

  As described above, when the two embodiments are compared, since the volume of the hollow portion is smaller in the second embodiment than in the first embodiment, the amount of the liquid A swirling in the hollow portion, that is, the inertia weight is naturally small. Therefore, if the pressure for pumping the liquid L into the hollow portion is the same, the second embodiment generates a higher-speed vortex, and the negative pressure of the negative pressure cavity V generated on the rotational symmetry axis X also increases.

  This is also clear from the results of experiments conducted by the inventors of the present invention. FIG. 6 shows an experiment in water using the prototypes of the first embodiment (substantially spherical) and the second embodiment (substantially hemispherical) with the same maximum diameter of the vessel body. The numerical values obtained by measuring the generated negative pressure are tabulated. The output of the pump that pumps water to the prototype was the same.

As a result, the flow rate of water passing through the apparatus is slightly higher than 15 g per second in the first embodiment, but is higher than 23 g per second in the second embodiment, and the smaller second embodiment is more per unit time. The flow rate of was shown to be large.

  In addition, the negative pressure generated in the hollow portion was 0.458 mAq on average as a result of three trials in the first embodiment, whereas 1.04 mAq on average as a result of seven trials in the second embodiment. The value was more than twice.

As a result of the experiment, it was confirmed that even when the liquid was pumped at the same pressure, the second embodiment allowed the liquid L to pass faster than the first embodiment, thereby generating a larger negative pressure in the hollow portion. For this reason, it is considered that the amount of air A that is self-absorbed per unit time is larger in the second embodiment. This is because the amount of microbubbles ejected from the gas-liquid ejection port is also visually observed. It was confirmed from the fact that there were more two embodiments.

From the above, in the swirling fine bubble generating device according to the present invention, it is more preferable in terms of both efficiency and miniaturization of the device that the shape of the hollow portion in the container is substantially hemispherical than spherical.

When the shape of the container is changed, the generation of the fine bubble generation point P at an appropriate position in the vicinity of the hollow portion side of the gas-liquid jet 12 is, as described above, the cone forming the gas inlet 11 This can be realized by controlling the height of the conical shape of the negative pressure cavity V by appropriately changing the angle of the trapezoidal side surface with respect to the rotational symmetry axis X and the cross-sectional area of the top of the truncated cone. FIG. 7 is a partially enlarged view illustrating the relationship between the shape of the frustoconical shape and the shape of the generated negative pressure cavity portion V. The conical shape of the negative pressure cavity portion V has a substantially truncated cone-shaped top portion as a bottom surface, and a conical shape. It was confirmed by the inventors' experiment that the side surface of the negative pressure cavity V is also formed along the extended surface of the trapezoidal side surface.

The embodiment of the swirling fine bubble generator according to the present invention has been described above with reference to the drawings. However, the present invention is not limited to the above embodiment, and the purpose of the improvement or the technical idea of the present invention. Within the scope of the present invention, improvements or modifications are possible and belong to the technical scope of the present invention.

  The present invention is applied to a fine bubble generating device for making a gas into fine bubbles and efficiently dissolving them in a liquid. For example, the present invention is suitable for a water quality improving device that improves the water quality by adding an amount of oxygen in water. The present invention is particularly suitable for a small water quality improvement device built in a domestic water purifier or a shower head because a highly efficient microbubble generator can be realized with a small size and a simple structure.

It is a side view of the turning type fine bubble generator concerning a first embodiment of the present invention. It is a front view of the revolving type fine bubble generator concerning a first embodiment of the present invention. It is sectional drawing of the turning-type fine bubble generator which concerns on 1st embodiment of this invention. It is a side view of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is sectional drawing of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is a table | surface of the numerical value of the test result performed using the prototype of the turning type fine bubble generator which concerns on 1st embodiment of this invention, and 2nd embodiment. It is the elements on larger scale which illustrate the change of the shape of the negative pressure cavity part by the shape of a truncated cone.

X Axis of rotation A Gas L Liquid MB Fine bubble R Eddy current (outward)
R 'vortex (return)
V negative pressure cavity 10 vessel (first embodiment)
11 Gas inlet (first embodiment)
12 Gas-liquid spout (first embodiment)
13 Gas introduction pipe (first embodiment)
14 Pressurized liquid introduction pipe (first embodiment)
15 Pressurized liquid inlet (first embodiment)
16 Curved surface (first embodiment)
20 body (second embodiment)
21 Gas inlet (second embodiment)
22 Gas-liquid spout (second embodiment)
23 Gas introduction pipe (second embodiment)
24 Pressurized liquid introduction pipe (second embodiment)
25 Pressurized liquid inlet (second embodiment)
26 Curved surface (second embodiment)
27 Wall body (second embodiment)

  The present invention relates to a fine bubble generating apparatus for efficiently dissolving a gas such as air or gas in water, other liquids, etc., for example, purifying water quality and reviving a water environment.

  Various types of microbubble generators are known, but there is a gas-liquid shearing system as a system that can stably generate a large amount of microbubbles with a relatively simple and small-scale apparatus. This gas-liquid shear method generates a high-speed vortex in a gas-liquid two-phase fluid, and a swirling cavity (hereinafter referred to as a “negative pressure cavity”) consisting of a negative pressure gas at the center of the vortex due to centrifugal separation of the liquid flow. The gas is sheared and refined by the difference in swirling speed between the liquid high-speed vortex and the negative pressure cavity.

As prior art of such a gas-liquid shearing type fine bubble generator, as disclosed in Patent Document 1 (Japanese Patent No. 3397154) and Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-116365), a cylindrical opening is used. The basic technique is to introduce a pressurized liquid into the inside of the container to generate a high-speed vortex, and to self-suck gas from the outside by the negative pressure of the negative-pressure cavity generated by the high-speed vortex to form fine bubbles.
Japanese Patent No. 3397154 JP 2006-116365 A

The inventor of the present invention has proposed the invention described in Patent Document 3 (Patent No. 4621796). That is, a gas-liquid jet is provided in the wall on one end of the cylindrical container with both ends closed, and the wall on the other end has a gas self-priming port and moves back and forth along the axial direction of the cylindrical container. By enabling this, the diffusion shape of the generated fine bubbles can be controlled, and a new gas-liquid shearing type fine bubble generator (hereinafter referred to as “swivel type fine bubble generator”) will be described. ).
Japanese Patent No. 4621796

On the other hand, in the swirl type fine bubble generator, the liquid and the gas are mixed in advance instead of separately introducing the liquid and the gas into the container as in the invention described in Patent Document 4 (Japanese Patent No. 3682286). An invention has also been proposed in which the gas-liquid mixed liquid is introduced in the state. The invention makes the shape of the vessel spherical, hemispherical, or various combinations of them, and in each vessel, a high-speed eddy current is generated in the vessel by the gas-liquid mixture introduced from a single inlet In addition, the microbubbles are ejected while taking in the liquid from one or two gas-liquid ejection openings opened in the liquid in which the container is immersed.
Japanese Patent No. 3682286

  By the way, as described above, the microbubble generator is intended to efficiently dissolve the gas into a liquid by making the gas into microbubbles, and can be used in large-scale water environments such as lakes, ponds, rivers, and the ocean. It is also applied to relatively limited small-scale water environments such as water tanks and waterworks. When applied to the former, the fine bubble generator and its associated equipment may be relatively large and complex, but when applied to the latter, a structure that is as small and simple as possible is required.

  As in the invention described in Patent Document 4, the method of introducing the gas-liquid mixture into the fine bubble generator can introduce a large amount of gas, and the gas-liquid mixing ratio can be controlled to a predetermined value in advance. It has advantages when envisioned for environmental applications. However, this method requires a separate device for controlling the mixing ratio of the gas and liquid, so it is difficult to reduce the size of the entire device including the incidental equipment. For example, a household water purifier or a shower head There is a problem that it is difficult to apply to a small-scale water environment, such as incorporation into a small water environment.

  In this method, the gas-liquid mixture must be swirled at a particularly high speed in order to generate fine bubbles after separating the mixed gas and liquid. Need to be pumped into the container. For this reason, an external pump is indispensable, which also becomes an obstacle to miniaturization.

  On the other hand, in the inventions described in Patent Documents 1 to 3, it is not necessary to preliminarily mix the gas and liquid. As long as the liquid introduced into the container generates a vortex with sufficient efficiency, the negative pressure of the negative pressure cavity is reduced. As a result, the gas is self-primed. The liquid and the gas are not mixed, and the gas is sheared at the tip of the fine bubble generation point of the negative pressure cavity formed by the self-sucked gas, and the fine bubble is generated. For this reason, not only can the apparatus itself be miniaturized, but, for example, if a high-speed eddy current can be generated by the water pressure of the water supply, even a pump is unnecessary, and it is easy to incorporate it into the aforementioned household items.

Thus, when considering application to a small-scale water environment, the method of introducing gas and liquid separately is more compact and simpler than the method of introducing a gas-liquid mixture. Therefore, it can be said that it is more suitable.

By the way, in the swirl type fine bubble generator, as described above, the gas introduced into the container forms a negative pressure cavity due to the high-speed vortex of the liquid, and is generated at the boundary between the gas and the liquid, particularly at the tip of the negative pressure cavity. At the microbubble generation point, the gas is continuously sheared due to the difference in swirling speed between the gas and the liquid, thereby generating microbubbles.

Here, as the swirling speed of the liquid vortex increases, the negative pressure in the negative pressure cavity increases and the amount of gas self-priming per unit time increases. Therefore, in order to efficiently generate a large amount of fine bubbles, it is desirable that the inside of the container has a structure capable of increasing the swirling speed of the vortex without applying high pressure to the liquid to be introduced.

In addition, since the difference in swirling speed between gas and liquid produces a shearing effect, in the negative pressure cavity, the shearing effect increases as the swirling speed rapidly increases from the gas inlet side toward the fine bubble generation point side, The generated bubbles can be further refined. That is, it is desirable that the cross-sectional area of the negative pressure cavity is large to some extent immediately after the gas is introduced into the container, and then rapidly decreases toward the point where the fine bubbles are generated at the tip.

In the fine bubble generating devices disclosed in Patent Documents 1 to 3, the inside of the container is basically a cylindrical space, and the inside is naturally filled with a liquid in which the fine bubble generating device is immersed. Therefore, regardless of whether the pressurized liquid inlet is installed on the gas inlet side or the gas liquid outlet side, the swirling speed of the liquid is increased between the vicinity of the pressurized liquid inlet and the opposite side due to the inertia of the liquid itself. In order to make a difference, it is difficult to sufficiently increase the swirling speed of the vortex flow as a result when the pressure is relatively small, regardless of whether the liquid is pumped at a large pressure.

In addition, Patent Documents 1 and 2 also show a diagram of a fine bubble generating device in which the inside of the container has a substantially conical shape, but in this case as well, the difference in the amount of liquid swirling between the substantially conical base and the top is shown. Therefore, there is a problem that the swirling speed of the vortex cannot be sufficiently increased with a relatively small pressure.

In view of the above, in the swirl type fine bubble generator, particularly the fine bubble generator adopting the method of introducing gas and liquid separately on the premise of application to a small-scale water environment, the pressure for pumping the liquid is small. However, it was necessary to further improve the internal shape of the container in order to increase the speed of the liquid vortex and generate a large amount of sufficiently fine bubbles.

  In order to solve the above-described problems, a swirling fine bubble generator according to the present invention has the following configuration.

  That is, the swirling fine bubble generator according to claim 1 of the present invention includes a substantially spherical container having a hollow portion formed in a rotational symmetry, and an outer wall on one side of the rotational symmetry axis of the container. In the vicinity of the gas / liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the rotational symmetry axis, a gas / liquid jet port opened on the other outer wall on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by microbubbles the gas that is sucked from the gas inlet by the swirling flow of the liquid that has flowed into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially spherical shape and the hollow portion filled with the liquid has also a substantially spherical shape, when the liquid in the hollow portion is swirled at high speed, the friction between the liquid and the wall can be minimized, Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently. In addition, since the pressurized liquid inlet is opened in a direction perpendicular to the rotational symmetry axis, the swirl axis of the liquid vortex generated in the hollow portion can coincide with the rotational symmetry axis of the container. Thereby, the eddy flow of the liquid in a hollow part becomes smooth.
(2) The liquid press-fitted from the pressurized liquid inlet immediately starts swirling along the curved surface of the inner wall of the hollow part, but the pressurized liquid inlet is provided on one side of the rotational symmetry axis of the vessel Since the liquid is provided near the jet outlet, the liquid turns along the inner wall of the hollow part toward the gas inlet on the opposite side (outward path), reverses in the vicinity of the gas inlet, and then returns along the rotational symmetry axis (return path). Finally, it is discharged from the gas-liquid jet outlet to the outside of the body.
(3) Since the swirl radius of the liquid is small in the vicinity of the pressurized liquid inlet and the friction with the liquid already existing in the hollow portion is small, the liquid is discharged at a relatively small pressure compared to the case where the hollow portion is cylindrical. Even if it is introduced, a vortex can be efficiently generated.
(4) Although the liquid travels to the gas inlet side while swirling, the vortex in this forward path does not swirl in a simple spiral but literally swirls along the curved surface of the inner wall surface. The swivel plane is inclined toward the gas inlet with respect to the rotational symmetry axis as compared with the case where the inside of the vessel is cylindrical. As a result, the total travel distance of the liquid in the forward path is shortened, the vortex flow speed increases, and the amount of liquid that reaches the vicinity of the gas inlet per unit time also increases. In addition, since the swirl radius of the liquid naturally increases near the center of the hollow portion, the traveling speed of the vortex flows temporarily decreases. On the other hand, since the centrifugal force increases, a negative pressure is generated on the rotationally symmetric axis, and the negative pressure causes a gas to be self-sucked from the gas inlet into the hollow portion to form a negative pressure cavity.
(5) When the vortex flows further in the direction of the gas inlet, the swirl radius of the liquid becomes smaller again, so the liquid swirl speed naturally increases, and the negative pressure cavity portion immediately after being formed near the gas inlet is negative. Since the pressure also increases, the gas is more efficiently self-primed into the hollow portion.
(6) In the process of the return path after the reversal of the vortex flow, the liquid travels along the outer axis along the axis of rotational symmetry. At this time, since the turning flow of the forward path occupies the outer peripheral side, the turning radius does not increase and passes through the center of the hollow portion while maintaining the turning speed. As the gas-liquid jet port is approached, the turning radius is further reduced and the turning speed is further increased. Therefore, the negative pressure cavity is compressed from the surrounding vortex and is tapered conically.
(7) Since the gas self-primed from the gas inlet into the negative pressure cavity has a specific gravity smaller than that of the liquid, the swirling speed is lower than the swirling speed of the liquid in contact. For this reason, a shearing effect is generated at the gas-liquid contact surface due to the difference in swirling speed between the two, and the gas becomes a fine bubble at a fine bubble generation point generated at a tip portion where the negative pressure cavity portion is tapered in a conical shape. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(8) In the present invention, since the gas inlet port is opened in the hollow portion so as to protrude in a substantially frustoconical shape, when the vortex reaching the inner wall of the hollow portion on the gas inlet side is reversed, Guided along the side. For this reason, the liquid easily recirculates along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(9) When the gas inlet is directly opened on the inner wall of the hollow portion, the shape of the negative pressure cavity portion becomes unstable due to the turbulent flow generated when the vortex flow of the liquid is reversed, and as a result, the fine bubbles at the microbubble generation point Bubble generation is also unstable. In the present invention, since the gas introduction port opens at the top of the substantially truncated cone shape, the self-sucked gas is discharged into the hollow portion at a position closer to the center than the inner wall of the hollow portion. Therefore, the influence of the turbulent flow on the negative pressure cavity can be prevented, and the efficiency of generating fine bubbles can be increased.

  As described above, by making the vessel body and the hollow part into a substantially spherical shape, a higher-speed liquid vortex can be generated even when the liquid is introduced at a relatively small pressure compared to the case of the conventional cylindrical shape. . As a result, since the negative pressure of the negative pressure cavity portion also increases, the amount of gas self-priming per unit time can be increased, and a larger amount of fine bubbles can be generated more efficiently. Also, by providing the gas inlet at the top of the substantially frustoconical shape protruding into the hollow part, the flow of liquid in the hollow part can be smoothed and the shape of the negative pressure cavity part can be stabilized, so the generation efficiency of fine bubbles is increased. It can be done.

  In addition to a perfect spherical shape, the entire length in the rotationally symmetric axis direction may be shorter than the maximum diameter of the outer periphery of the vessel, and may be a spherical shape that is compressed in the rotationally symmetric axis direction as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 2 of the present invention is the swirl type fine bubble generator according to claim 1, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  With this configuration, the reversal of the liquid vortex near the gas inlet can be further smoothed. The liquid in the hollow part swirls smoothly along the inner wall of the substantially spherical hollow part, but at the time of inversion, a turbulent flow is generated at the base of the gas inlet protruding in a substantially frustoconical shape, disturbing the swirling of the liquid in the hollow part. There is a fear. By making the substantially frustoconical side surface of the gas inlet into a curved surface integrated with the inner wall surface of the hollow portion, the occurrence of turbulence itself can be more effectively prevented.

  Next, a swirl type fine bubble generator according to claim 3 of the present invention is the swirl type fine bubble generator according to claim 1 or 2, wherein the gas inlet has the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  By providing the gas introduction pipe with the gas introduction port, the position for introducing the gas into the hollow portion can be arbitrarily changed. When only the position of the gas inlet is moved back and forth along the rotational symmetry axis while fixing other implementation conditions, the amount of fine bubbles generated decreases as the gas inlet is closer to the center of the hollow part, and vice versa. Increases the amount of microbubbles generated. When the position of the gas inlet is brought closer to the center of the hollow portion, the total length of the negative pressure cavity portion is shortened, and the amount of gas reaching the fine bubble generation point per unit time is increased. If the swirl speed of the liquid is constant, the efficiency of the shear effect at the microbubble generation point is also constant, so if the amount of gas is too large, excess gas will not be made into microbubbles but will be released from the gas-liquid jet outlet as large bubbles. As a result, the amount of fine bubbles generated is reduced. On the contrary, if the gas inlet is close to the inner wall of the hollow part, the total length of the negative pressure cavity part becomes long, and the gas that has reached the fine bubble generation point is made into fine bubbles, so the amount of fine bubbles generated increases. It is.

  Thus, as in the invention described in Patent Document 4, in the present invention, the gas inlet tube is simply and mechanically introduced without adopting a method of introducing a gas-liquid mixed liquid in which the mixing ratio of gas and liquid is adjusted in advance. By changing the amount of protrusion into the hollow portion, the amount of fine bubbles generated can be easily controlled. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  Furthermore, since the gas introduction pipe is a component independent of the gas introduction port provided in the container, it can be removed and cleaned as appropriate. The main body has a total of three openings: a liquid inlet, a gas-liquid jet, and a gas inlet. During operation of the device, the liquid inlet and the gas-liquid jet do not add liquid or gas-liquid mixture. Therefore, if a filter or the like is provided in the liquid flow path leading to the liquid inlet, large foreign objects can be prevented from entering, and foreign objects smaller than the inner diameter of the gas-liquid jet outlet can be discharged naturally outside the body by the liquid pressure. Is done. On the other hand, the gas flow path leading to the gas inlet has a structure in which atmospheric pressure gas is self-primed by the operation of the apparatus. For this reason, even if large foreign matters can be removed by a filter, it is not appropriate to provide a filter that can remove even small foreign matters in order not to reduce the intake efficiency. As a result, since the gas self-priming pressure is much smaller than the liquid introduction pressure, small foreign substances in the gas are likely to remain at the gas introduction port, which may cause clogging. However, if the gas inlet is configured as a gas inlet pipe as an independent part, remove only the clogged gas inlet pipe from the body as necessary, and clean the inside of the pipe or replace the gas inlet pipe itself This has the advantage that it can be easily handled.

  Next, a swirl type fine bubble generator according to claim 4 of the present invention is rotationally symmetric between a substantially hemispherical container having a hollow portion formed in a rotational symmetry and an outer wall on the bottom side of the substantially hemispherical surface of the container. In the vicinity of the gas-liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the axis, a gas-liquid jet port opened on the outer wall on the substantially hemispherical top side on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by making the gas flowing from the gas inlet into a fine bubble by the swirling flow of the liquid self-sucked into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially hemispherical shape, and the hollow portion filled with the liquid also has a substantially hemispherical shape, the friction between the liquid and the wall body can be minimized, as in the case of the substantially spherical body. Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently.
(2) Moreover, since the total amount of liquid in the hollow portion is smaller than in the case of a substantially spherical body and the inertia of the swirling liquid is smaller, the swirling speed of the vortex can be further increased even when the liquid introduction pressure is the same. The amount of gas that is self-primed per unit time can be increased. Since the vortex in the forward path literally swirls along the curved surface of the inner wall, the swirling surface of the vortex is inclined toward the gas inlet with respect to the rotational axis of symmetry, and therefore the total travel of the liquid in the forward path Similar to the first aspect of the invention, the distance is shortened to increase the speed of vortex flow, and the amount of liquid that reaches the vicinity of the gas inlet per unit time also increases.
(3) Since the hollow portion has a substantially hemispherical shape, the position of the gas introduction port is close to the gas-liquid jet port facing the inside of the hollow portion, so that the overall length of the formed negative pressure cavity portion is also shortened. As a result, the cross section of the negative pressure cavity portion decreases rapidly from the vicinity of the gas inlet toward the tip of the negative pressure cavity portion. As a result, the swirling speed of the liquid vortex at the microbubble generation point generated at the tip of the negative pressure cavity is also rapidly increased, and the shear efficiency of the gas is improved, so that smaller microbubbles can be generated. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(4) Since the gas introduction port is formed in the hollow portion so as to protrude in a substantially frustoconical shape, as in the invention described in claim 1, the flow of the liquid reaching the hollow portion inner wall on the gas introduction side is reversed. In this case, the liquid is guided by the substantially frustoconical side surface and is easy to recirculate along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(5) On the other hand, unlike the invention according to claim 1, the hollow part is substantially hemispherical and has the maximum radius near the gas inlet, so that when the liquid is reversed, the hollow part is substantially spherical. Although the swirling speed does not increase as much as the case, since the outer diameter of the hollow portion is reduced immediately after reversal, the effect of increasing the swirling speed of the liquid toward the tip of the negative pressure cavity is the same.
(6) As a result, the cross section of the negative pressure cavity is rapidly reduced at a short distance along the rotational symmetry axis, and the shear efficiency of the gas at the microbubble generation point at the tip is increased.

  In addition to the hemispherical shape of the vessel, the overall length in the rotationally symmetric axis direction may be further shortened to have a convex lens shape as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 5 of the present invention is the swivel type fine bubble generator according to claim 4, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  In the swirl type fine bubble generator according to claim 4, since the cross-sectional area of the hollow portion is the maximum around the gas inlet as described above, there is a possibility that turbulence will occur at the time of reversal of the swirl flow of the liquid. Although it is smaller than the swirl type fine bubble generator according to the above, by making the substantially frustoconical side surface of the gas introduction port a curved surface integrated with the inner wall surface of the hollow portion, the generation of this turbulent flow can be prevented more effectively. it can.

  Next, the swirl type fine bubble generator according to claim 6 of the present invention is the swirl type fine bubble generator according to any one of claims 4 and 5, wherein the gas inlet is the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  Similarly to the swirling fine bubble generator according to the third aspect, by moving the gas introduction tube along the rotational symmetry axis, the position for introducing the gas into the hollow portion can be arbitrarily changed. Thus, the present invention simply and mechanically changes the amount of protrusion into the hollow portion of the gas introduction tube without adopting a method of introducing a gas-liquid mixture whose gas / liquid mixing ratio has been adjusted in advance. Thus, it becomes possible to easily control the generation amount of fine bubbles. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  According to the present invention, it is possible to realize a swivel type microbubble generator that can efficiently generate microbubbles with a small and simple structure. In this swirling microbubble generator, the gas is automatically sucked into microbubbles by pumping the liquid into the container by an external pump. In particular, when the vessel body is extremely small, it can be operated even at a pressure about the water pressure of tap water, for example, and can be easily incorporated into household equipment such as a water purifier and a shower head. Therefore, this invention has the effect that the application range in a small-scale water environment can be expanded in a turning type fine bubble generator.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a swirling fine bubble generator according to a first embodiment of the present invention. The substantially spherical vessel 10 having a hollow inside has a gas-liquid jet 12 and a gas introduction pipe 13 at a position facing the rotational symmetry axis of the outer wall thereof, and is rotationally symmetric in the vicinity of the gas-liquid jet 12. A pressurized liquid introduction pipe 14 is connected in a direction perpendicular to the axis. FIG. 2 is a front view of the substantially spherical vessel 10 viewed from the gas-liquid jet 12 side.

FIG. 3 is a cross-sectional view of the swirling fine bubble generating device of FIG. The inside of the vessel body 10 is hollow, and the inner wall of the hollow portion forms a smooth spherical inner surface except for the vicinity of the gas inlet 16. On the other hand, the gas introduction port 16 has a substantially truncated cone shape protruding into the hollow portion along the rotational symmetry axis X, and the substantially truncated cone side surface forms a smooth curved surface 16 integrally with the spherical inner surface. Moreover, the gas introduction pipe | tube 13 is provided in the form which penetrates the gas introduction port 11 from the exterior of the container body 10. FIG. The pressurized liquid introduction pipe 14 is connected in the vicinity of the opening of the inner wall of the hollow part of the gas-liquid jet port 12 in the direction perpendicular to the rotational symmetry axis X, and forms a pressurized liquid inlet 15 on the inner wall of the hollow part. Yes.

Prior to the operation of the swirling fine bubble generating device, the hollow portion is filled with a liquid in which the device itself is immersed. When the device is operated, the liquid L fed from the pressurized liquid introducing pipe 14 is introduced into the pressurized liquid. It is newly introduced into the hollow portion through the mouth 15.

The introduced liquid L immediately swirls along the inner wall of the hollow portion, proceeds in the direction of the gas inlet 11 (leftward in FIG. 3), and generates a vortex R. The swirl R swirls with a small radius near the pressurized liquid inlet 15, but swirls with a maximum radius near the center of the hollow portion, and swirls again with a small radius near the gas inlet 11.

The vortex flow R that has reached the curved surface 16 is reversed along the curved surface 16 and proceeds in the right direction along the rotational symmetry axis X while forming a return vortex flow R 'inside the forward vortex flow R. The swirl of the vortex R ′ is in the same direction as the vortex R, but the radius is small, so the swirl speed is larger than that of the vortex R. Therefore, a negative pressure is generated in the liquid L in the hollow portion along the rotational symmetry axis X, and the gas A is sucked into the hollow portion from the gas introduction pipe 13 by the negative pressure, and the negative pressure is generated along the rotational symmetry axis X. A cavity V is generated.

The gas A forming the negative pressure cavity V is rotated by friction with the vortex flow R ′ and proceeds to the right while swirling, but the swirl radius of the vortex flow R ′ becomes smaller as it approaches the gas-liquid jet port 12. Since the turning speed is also increased, the negative pressure cavity V becomes a tapered conical shape. On the outer surface of the negative pressure cavity V, the swirling speed of the gas A is smaller than the swirling speed of the liquid L due to the difference in specific gravity between the gas A and the swirling liquid L ′. A shear effect is generated with respect to the gas A, and a fine bubble generation point P is generated at which the gas A is continuously sheared at the tip of the negative pressure cavity V to form fine bubbles.

Thereafter, the vortex flow R ′ becomes a gas-liquid mixed liquid state containing the fine bubbles MB and is discharged from the gas-liquid jet 12 to the outside of the container, and the fine bubbles MB are diffused into the external liquid.

FIG. 4 is a side view of the swirling fine bubble generating device according to the second embodiment of the present invention. A substantially hemispherical container body 20 having a hollow inside has a gas-liquid jet port 22 and a gas introduction pipe 23 at a position facing the rotational symmetry axis X of the outer wall, and in the vicinity of the gas-liquid jet port 22. A pressurized liquid introduction tube 24 is connected in a direction perpendicular to the rotational symmetry axis X.

FIG. 5 is a cross-sectional view of the swivel type fine bubble generator of FIG. 4 taken along the rotational symmetry axis X. The inside of the vessel body 20 is hollow, and the inner wall of the hollow portion forms a smooth hemispheric inner surface with the gas-liquid jet port 22 at the top, but the gas inlet 21 side is a circular wall body that blocks the bottom surface of the hemisphere. 27. On the other hand, the gas introduction port 21 has a substantially truncated cone shape that protrudes from the wall body 27 into the hollow portion along the rotational symmetry axis X, and smoothly curves from the inner wall of the hollow portion to the side surface of the substantially truncated cone shape through the wall body 27. A surface 26 is formed. Further, a gas introduction pipe 23 is provided so as to penetrate the wall body 27 and the gas introduction port 21 from the outside of the vessel body 20. Further, the pressurized liquid introduction pipe 24 is connected in the vicinity of the opening of the inner wall of the hollow portion of the gas-liquid jet port 22 in the direction perpendicular to the rotational symmetry axis X, and the pressurized liquid inlet 25 is formed in the inner wall of the hollow portion. doing.

  Also in this embodiment, the liquid L pumped from the pressurized liquid introduction pipe 24 by operating the apparatus is newly introduced into the hollow portion through the pressurized liquid introduction port 25, and the generated vortex R swirls in the left direction in the figure. However, the process of proceeding is the same as in the first embodiment.

  In the present embodiment, when the hollow portion has the maximum radius, the vortex flow R reaches the wall body 27, is reversed along the curved surface 26 to become the vortex flow R ′, and the inside of the vortex flow R along the rotational symmetry axis X is aired. It proceeds toward the liquid spout 22. Since the swirl radius is not reduced as in the first embodiment before the vortex R is reversed, the generation of turbulent flow in the vicinity of the gas inlet 21 is suppressed.

  In this embodiment, since the hollow portion is substantially hemispherical and has a short length in the direction of the rotational symmetry axis X, the swirl radius of the vortex R ′ after reversal becomes smaller at a shorter distance than in the first embodiment. As a result, the total length of the generated negative pressure cavity V is also shortened, and the cross-sectional area is narrowed more rapidly than in the first embodiment. Therefore, the swirling speed of the vortex R 'around the negative pressure cavity V is also increased more rapidly than in the first embodiment, and the shear effect on the gas A is sufficiently high at the fine bubble generation point P.

  As described above, when the two embodiments are compared, since the volume of the hollow portion is smaller in the second embodiment than in the first embodiment, the amount of the liquid A swirling in the hollow portion, that is, the inertia weight is naturally small. Therefore, if the pressure for pumping the liquid L into the hollow portion is the same, the second embodiment generates a higher-speed vortex, and the negative pressure of the negative pressure cavity V generated on the rotational symmetry axis X also increases.

  This is also clear from the results of experiments conducted by the inventors of the present invention. FIG. 6 shows an experiment in water using the prototypes of the first embodiment (substantially spherical) and the second embodiment (substantially hemispherical) with the same maximum diameter of the vessel body. The numerical values obtained by measuring the generated negative pressure are tabulated. The output of the pump that pumps water to the prototype was the same.

As a result, the flow rate of water passing through the apparatus is slightly higher than 15 g per second in the first embodiment, but is higher than 23 g per second in the second embodiment, and the smaller second embodiment is more per unit time. The flow rate of was shown to be large.

  In addition, the negative pressure generated in the hollow portion was 0.458 mAq on average as a result of three trials in the first embodiment, whereas 1.04 mAq on average as a result of seven trials in the second embodiment. The value was more than twice.

As a result of the experiment, it was confirmed that even when the liquid was pumped at the same pressure, the second embodiment allowed the liquid L to pass faster than the first embodiment, thereby generating a larger negative pressure in the hollow portion. For this reason, it is considered that the amount of air A that is self-absorbed per unit time is larger in the second embodiment. This is because the amount of microbubbles ejected from the gas-liquid ejection port is also visually observed. It was confirmed from the fact that there were more two embodiments.

From the above, in the swirling fine bubble generating device according to the present invention, it is more preferable in terms of both efficiency and miniaturization of the device that the shape of the hollow portion in the container is substantially hemispherical than spherical.

When the shape of the container is changed, the generation of the fine bubble generation point P at an appropriate position in the vicinity of the hollow portion side of the gas-liquid jet 12 is, as described above, the cone forming the gas inlet 11 This can be realized by controlling the height of the conical shape of the negative pressure cavity V by appropriately changing the angle of the trapezoidal side surface with respect to the rotational symmetry axis X and the cross-sectional area of the top of the truncated cone. FIG. 7 is a partially enlarged view illustrating the relationship between the shape of the frustoconical shape and the shape of the generated negative pressure cavity portion V. The conical shape of the negative pressure cavity portion V has a substantially truncated cone-shaped top portion as a bottom surface, and a conical shape. It was confirmed by the inventors' experiment that the side surface of the negative pressure cavity V is also formed along the extended surface of the trapezoidal side surface.

The embodiment of the swirling fine bubble generator according to the present invention has been described above with reference to the drawings. However, the present invention is not limited to the above embodiment, and the purpose of the improvement or the technical idea of the present invention. Within the scope of the present invention, improvements or modifications are possible and belong to the technical scope of the present invention.

  The present invention is applied to a fine bubble generating device for making a gas into fine bubbles and efficiently dissolving them in a liquid. For example, the present invention is suitable for a water quality improving device that improves the water quality by adding an amount of oxygen in water. The present invention is particularly suitable for a small water quality improvement device built in a domestic water purifier or a shower head because a highly efficient microbubble generator can be realized with a small size and a simple structure.

It is a side view of the turning type fine bubble generator concerning a first embodiment of the present invention. It is a front view of the revolving type fine bubble generator concerning a first embodiment of the present invention. It is sectional drawing of the turning-type fine bubble generator which concerns on 1st embodiment of this invention. It is a side view of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is sectional drawing of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is a table | surface of the numerical value of the test result performed using the prototype of the turning type fine bubble generator which concerns on 1st embodiment of this invention, and 2nd embodiment. It is the elements on larger scale which illustrate the change of the shape of the negative pressure cavity part by the shape of a truncated cone.

X Axis of rotation A Gas L Liquid MB Fine bubble R Eddy current (outward)
R 'vortex (return)
V negative pressure cavity 10 vessel (first embodiment)
11 Gas inlet (first embodiment)
12 Gas-liquid spout (first embodiment)
13 Gas introduction pipe (first embodiment)
14 Pressurized liquid introduction pipe (first embodiment)
15 Pressurized liquid inlet (first embodiment)
16 Curved surface (first embodiment)
20 body (second embodiment)
21 Gas inlet (second embodiment)
22 Gas-liquid spout (second embodiment)
23 Gas introduction pipe (second embodiment)
24 Pressurized liquid introduction pipe (second embodiment)
25 Pressurized liquid inlet (second embodiment)
26 Curved surface (second embodiment)
27 Wall body (second embodiment)

  The present invention relates to a fine bubble generating apparatus for efficiently dissolving a gas such as air or gas in water, other liquids, etc., for example, purifying water quality and reviving a water environment.

  Various types of microbubble generators are known, but there is a gas-liquid shearing system as a system that can stably generate a large amount of microbubbles with a relatively simple and small-scale apparatus. This gas-liquid shear method generates a high-speed vortex in a gas-liquid two-phase fluid, and a swirling cavity (hereinafter referred to as a “negative pressure cavity”) consisting of a negative pressure gas at the center of the vortex due to centrifugal separation of the liquid flow. The gas is sheared and refined by the difference in swirling speed between the liquid high-speed vortex and the negative pressure cavity.

As prior art of such a gas-liquid shearing type fine bubble generator, as disclosed in Patent Document 1 (Japanese Patent No. 3397154) and Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-116365), a cylindrical opening is used. The basic technique is to introduce a pressurized liquid into the inside of the container to generate a high-speed vortex, and to self-suck gas from the outside by the negative pressure of the negative-pressure cavity generated by the high-speed vortex to form fine bubbles.
Japanese Patent No. 3397154 JP 2006-116365 A

The inventor of the present invention has proposed the invention described in Patent Document 3 (Patent No. 4621796). That is, a gas-liquid jet is provided in the wall on one end of the cylindrical container with both ends closed, and the wall on the other end has a gas self-priming port and moves back and forth along the axial direction of the cylindrical container. By enabling this, the diffusion shape of the generated fine bubbles can be controlled, and a new gas-liquid shearing type fine bubble generator (hereinafter referred to as “swivel type fine bubble generator”) will be described. ).
Japanese Patent No. 4621796

On the other hand, in the swirl type fine bubble generator, the liquid and the gas are mixed in advance instead of separately introducing the liquid and the gas into the container as in the invention described in Patent Document 4 (Japanese Patent No. 3682286). An invention has also been proposed in which the gas-liquid mixed liquid is introduced in the state. The invention makes the shape of the vessel spherical, hemispherical, or various combinations of them, and in each vessel, a high-speed eddy current is generated in the vessel by the gas-liquid mixture introduced from a single inlet In addition, the microbubbles are ejected while taking in the liquid from one or two gas-liquid ejection openings opened in the liquid in which the container is immersed.
Japanese Patent No. 3682286

  By the way, as described above, the microbubble generator is intended to efficiently dissolve the gas into a liquid by making the gas into microbubbles, and can be used in large-scale water environments such as lakes, ponds, rivers, and the ocean. It is also applied to relatively limited small-scale water environments such as water tanks and waterworks. When applied to the former, the fine bubble generator and its associated equipment may be relatively large and complex, but when applied to the latter, a structure that is as small and simple as possible is required.

  As in the invention described in Patent Document 4, the method of introducing the gas-liquid mixture into the fine bubble generator can introduce a large amount of gas, and the gas-liquid mixing ratio can be controlled to a predetermined value in advance. It has advantages when envisioned for environmental applications. However, this method requires a separate device for controlling the mixing ratio of the gas and liquid, so it is difficult to reduce the size of the entire device including the incidental equipment. For example, a household water purifier or a shower head There is a problem that it is difficult to apply to a small-scale water environment, such as incorporation into a small water environment.

  In this method, the gas-liquid mixture must be swirled at a particularly high speed in order to generate fine bubbles after separating the mixed gas and liquid. Need to be pumped into the container. For this reason, an external pump is indispensable, which also becomes an obstacle to miniaturization.

  On the other hand, in the inventions described in Patent Documents 1 to 3, it is not necessary to preliminarily mix the gas and liquid. As long as the liquid introduced into the container generates a vortex with sufficient efficiency, the negative pressure of the negative pressure cavity is reduced. As a result, the gas is self-primed. The liquid and the gas are not mixed, and the gas is sheared at the tip of the fine bubble generation point of the negative pressure cavity formed by the self-sucked gas, and the fine bubble is generated. For this reason, not only can the apparatus itself be miniaturized, but, for example, if a high-speed eddy current can be generated by the water pressure of the water supply, even a pump is unnecessary, and it is easy to incorporate it into the aforementioned household items.

Thus, when considering application to a small-scale water environment, the method of introducing gas and liquid separately is more compact and simpler than the method of introducing a gas-liquid mixture. Therefore, it can be said that it is more suitable.

By the way, in the swirl type fine bubble generator, as described above, the gas introduced into the container forms a negative pressure cavity due to the high-speed vortex of the liquid, and is generated at the boundary between the gas and the liquid, particularly at the tip of the negative pressure cavity. At the microbubble generation point, the gas is continuously sheared due to the difference in swirling speed between the gas and the liquid, thereby generating microbubbles.

Here, as the swirling speed of the liquid vortex increases, the negative pressure in the negative pressure cavity increases and the amount of gas self-priming per unit time increases. Therefore, in order to efficiently generate a large amount of fine bubbles, it is desirable that the inside of the container has a structure capable of increasing the swirling speed of the vortex without applying high pressure to the liquid to be introduced.

In addition, since the difference in swirling speed between gas and liquid produces a shearing effect, in the negative pressure cavity, the shearing effect increases as the swirling speed rapidly increases from the gas inlet side toward the fine bubble generation point side, The generated bubbles can be further refined. That is, it is desirable that the cross-sectional area of the negative pressure cavity is large to some extent immediately after the gas is introduced into the container, and then rapidly decreases toward the point where the fine bubbles are generated at the tip.

In the fine bubble generating devices disclosed in Patent Documents 1 to 3, the inside of the container is basically a cylindrical space, and the inside is naturally filled with a liquid in which the fine bubble generating device is immersed. Therefore, regardless of whether the pressurized liquid inlet is installed on the gas inlet side or the gas liquid outlet side, the swirling speed of the liquid is increased between the vicinity of the pressurized liquid inlet and the opposite side due to the inertia of the liquid itself. In order to make a difference, it is difficult to sufficiently increase the swirling speed of the vortex flow as a result when the pressure is relatively small, regardless of whether the liquid is pumped at a large pressure.

In addition, Patent Documents 1 and 2 also show a diagram of a fine bubble generating device in which the inside of the container has a substantially conical shape, but in this case as well, the difference in the amount of liquid swirling between the substantially conical base and the top is shown. Therefore, there is a problem that the swirling speed of the vortex cannot be sufficiently increased with a relatively small pressure.

In view of the above, in the swirl type fine bubble generator, particularly the fine bubble generator adopting the method of introducing gas and liquid separately on the premise of application to a small-scale water environment, the pressure for pumping the liquid is small. However, it was necessary to further improve the internal shape of the container in order to increase the speed of the liquid vortex and generate a large amount of sufficiently fine bubbles.

  In order to solve the above-described problems, a swirling fine bubble generator according to the present invention has the following configuration.

  That is, the swirling fine bubble generator according to claim 1 of the present invention includes a substantially spherical container having a hollow portion formed in a rotational symmetry, and an outer wall on one side of the rotational symmetry axis of the container. In the vicinity of the gas / liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the rotational symmetry axis, a gas / liquid jet port opened on the other outer wall on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by microbubbles the gas that is sucked from the gas inlet by the swirling flow of the liquid that has flowed into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially spherical shape and the hollow portion filled with the liquid has also a substantially spherical shape, when the liquid in the hollow portion is swirled at high speed, the friction between the liquid and the wall can be minimized, Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently. In addition, since the pressurized liquid inlet is opened in a direction perpendicular to the rotational symmetry axis, the swirl axis of the liquid vortex generated in the hollow portion can coincide with the rotational symmetry axis of the container. Thereby, the eddy flow of the liquid in a hollow part becomes smooth.
(2) The liquid press-fitted from the pressurized liquid inlet immediately starts swirling along the curved surface of the inner wall of the hollow part, but the pressurized liquid inlet is provided on one side of the rotational symmetry axis of the vessel Since the liquid is provided near the jet outlet, the liquid turns along the inner wall of the hollow part toward the gas inlet on the opposite side (outward path), reverses in the vicinity of the gas inlet, and then returns along the rotational symmetry axis (return path). Finally, it is discharged from the gas-liquid jet outlet to the outside of the body.
(3) Since the swirl radius of the liquid is small in the vicinity of the pressurized liquid inlet and the friction with the liquid already existing in the hollow portion is small, the liquid is discharged at a relatively small pressure compared to the case where the hollow portion is cylindrical. Even if it is introduced, a vortex can be efficiently generated.
(4) The liquid proceeds to the gas inlet side while swirling, but naturally the swirl radius of the liquid increases near the center of the hollow portion, and thus the traveling speed of the vortex flows temporarily decreases. On the other hand, since the centrifugal force increases, a negative pressure is generated on the rotationally symmetric axis, and the negative pressure causes a gas to be self-sucked from the gas inlet into the hollow portion to form a negative pressure cavity.
(5) When the vortex flows further in the direction of the gas inlet, the swirl radius of the liquid becomes smaller again, so the liquid swirl speed naturally increases, and the negative pressure cavity portion immediately after being formed near the gas inlet is negative. Since the pressure also increases, the gas is more efficiently self-primed into the hollow portion.
(6) In the process of the return path after the reversal of the vortex flow, the liquid travels along the outer axis along the axis of rotational symmetry. At this time, since the turning flow of the forward path occupies the outer peripheral side, the turning radius does not increase and passes through the center of the hollow portion while maintaining the turning speed. As the gas-liquid jet port is approached, the turning radius is further reduced and the turning speed is further increased. Therefore, the negative pressure cavity is compressed from the surrounding vortex and is tapered conically.
(7) Since the gas self-primed from the gas inlet into the negative pressure cavity has a specific gravity smaller than that of the liquid, the swirling speed is lower than the swirling speed of the liquid in contact. For this reason, a shearing effect is generated at the gas-liquid contact surface due to the difference in swirling speed between the two, and the gas becomes a fine bubble at a fine bubble generation point generated at a tip portion where the negative pressure cavity portion is tapered in a conical shape. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(8) In the present invention, since the gas inlet port is opened in the hollow portion so as to protrude in a substantially frustoconical shape, when the vortex reaching the inner wall of the hollow portion on the gas inlet side is reversed, Guided along the side. For this reason, the liquid easily recirculates along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(9) When the gas inlet is directly opened on the inner wall of the hollow portion, the shape of the negative pressure cavity portion becomes unstable due to the turbulent flow generated when the vortex flow of the liquid is reversed, and as a result, the fine bubbles at the microbubble generation point Bubble generation is also unstable. In the present invention, since the gas introduction port opens at the top of the substantially truncated cone shape, the self-sucked gas is discharged into the hollow portion at a position closer to the center than the inner wall of the hollow portion. Therefore, the influence of the turbulent flow on the negative pressure cavity can be prevented, and the efficiency of generating fine bubbles can be increased.

  As described above, by making the vessel body and the hollow part into a substantially spherical shape, a higher-speed liquid vortex can be generated even when the liquid is introduced at a relatively small pressure compared to the case of the conventional cylindrical shape. . As a result, since the negative pressure of the negative pressure cavity portion also increases, the amount of gas self-priming per unit time can be increased, and a larger amount of fine bubbles can be generated more efficiently. Also, by providing the gas inlet at the top of the substantially frustoconical shape protruding into the hollow part, the flow of liquid in the hollow part can be smoothed and the shape of the negative pressure cavity part can be stabilized, so the generation efficiency of fine bubbles is increased. It can be done.

  In addition to a perfect spherical shape, the entire length in the rotationally symmetric axis direction may be shorter than the maximum diameter of the outer periphery of the vessel, and may be a spherical shape that is compressed in the rotationally symmetric axis direction as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 2 of the present invention is the swirl type fine bubble generator according to claim 1, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  With this configuration, the reversal of the liquid vortex near the gas inlet can be further smoothed. The liquid in the hollow part swirls smoothly along the inner wall of the substantially spherical hollow part, but at the time of inversion, a turbulent flow is generated at the base of the gas inlet protruding in a substantially frustoconical shape, disturbing the swirling of the liquid in the hollow part. There is a fear. By making the substantially frustoconical side surface of the gas inlet into a curved surface integrated with the inner wall surface of the hollow portion, the occurrence of turbulence itself can be more effectively prevented.

  Next, a swirl type fine bubble generator according to claim 3 of the present invention is the swirl type fine bubble generator according to claim 1 or 2, wherein the gas inlet has the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  By providing the gas introduction pipe with the gas introduction port, the position for introducing the gas into the hollow portion can be arbitrarily changed. When only the position of the gas inlet is moved back and forth along the rotational symmetry axis while fixing other implementation conditions, the amount of fine bubbles generated decreases as the gas inlet is closer to the center of the hollow part, and vice versa. Increases the amount of microbubbles generated. When the position of the gas inlet is brought closer to the center of the hollow portion, the total length of the negative pressure cavity portion is shortened, and the amount of gas reaching the fine bubble generation point per unit time is increased. If the swirl speed of the liquid is constant, the efficiency of the shear effect at the microbubble generation point is also constant, so if the amount of gas is too large, excess gas will not be made into microbubbles but will be released from the gas-liquid jet outlet as large bubbles. As a result, the amount of fine bubbles generated is reduced. On the contrary, if the gas inlet is close to the inner wall of the hollow part, the total length of the negative pressure cavity part becomes long, and the gas that has reached the fine bubble generation point is made into fine bubbles, so the amount of fine bubbles generated increases. It is.

  Thus, as in the invention described in Patent Document 4, in the present invention, the gas inlet tube is simply and mechanically introduced without adopting a method of introducing a gas-liquid mixed liquid in which the mixing ratio of gas and liquid is adjusted in advance. By changing the amount of protrusion into the hollow portion, the amount of fine bubbles generated can be easily controlled. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  Furthermore, since the gas introduction pipe is a component independent of the gas introduction port provided in the container, it can be removed and cleaned as appropriate. The main body has a total of three openings: a liquid inlet, a gas-liquid jet, and a gas inlet. During operation of the device, the liquid inlet and the gas-liquid jet do not add liquid or gas-liquid mixture. Therefore, if a filter or the like is provided in the liquid flow path leading to the liquid inlet, large foreign objects can be prevented from entering, and foreign objects smaller than the inner diameter of the gas-liquid jet outlet can be discharged naturally outside the body by the liquid pressure. Is done. On the other hand, the gas flow path leading to the gas inlet has a structure in which atmospheric pressure gas is self-primed by the operation of the apparatus. For this reason, even if large foreign matters can be removed by a filter, it is not appropriate to provide a filter that can remove even small foreign matters in order not to reduce the intake efficiency. As a result, since the gas self-priming pressure is much smaller than the liquid introduction pressure, small foreign substances in the gas are likely to remain at the gas introduction port, which may cause clogging. However, if the gas inlet is configured as a gas inlet pipe as an independent part, remove only the clogged gas inlet pipe from the body as necessary, and clean the inside of the pipe or replace the gas inlet pipe itself This has the advantage that it can be easily handled.

  Next, a swirl type fine bubble generator according to claim 4 of the present invention is rotationally symmetric between a substantially hemispherical container having a hollow portion formed in a rotational symmetry and an outer wall on the bottom side of the substantially hemispherical surface of the container. In the vicinity of the gas-liquid jet port, a gas inlet port opened by projecting into a substantially frustoconical shape in the hollow portion along the axis, a gas-liquid jet port opened on the outer wall on the substantially hemispherical top side on the rotational symmetry axis, and A pressurized liquid inlet that is opened in a direction perpendicular to the rotational symmetry axis, and the gas-liquid outlet is formed by making the gas flowing from the gas inlet into a fine bubble by the swirling flow of the liquid self-sucked into the container. A swirling gas-liquid mixture containing fine bubbles is derived from the above.

With this configuration, the following effects can be obtained.
(1) Since the container body has a substantially hemispherical shape, and the hollow portion filled with the liquid also has a substantially hemispherical shape, the friction between the liquid and the wall body can be minimized, as in the case of the substantially spherical body. Even if the pressure of liquid pumping is small, the swirl speed of the vortex can be increased efficiently.
(2) Moreover, since the total amount of liquid in the hollow portion is smaller than in the case of a substantially spherical body and the inertia of the swirling liquid is smaller, the swirling speed of the vortex can be further increased even when the liquid introduction pressure is the same. The amount of gas that is self-primed per unit time can be increased.
(3) Since the hollow portion has a substantially hemispherical shape, the position of the gas introduction port is close to the gas-liquid jet port facing the inside of the hollow portion, so that the overall length of the formed negative pressure cavity portion is also shortened. As a result, the cross section of the negative pressure cavity portion decreases rapidly from the vicinity of the gas inlet toward the tip of the negative pressure cavity portion. As a result, the swirling speed of the liquid vortex at the microbubble generation point generated at the tip of the negative pressure cavity is also rapidly increased, and the shear efficiency of the gas is improved, so that smaller microbubbles can be generated. In addition, it is desirable to generate the fine bubble generation point in the vicinity of the gas-liquid jet outlet in the hollow portion.
(4) Since the gas introduction port is formed in the hollow portion so as to protrude in a substantially frustoconical shape, as in the invention described in claim 1, the flow of the liquid reaching the hollow portion inner wall on the gas introduction side is reversed. In this case, the liquid is guided by the substantially frustoconical side surface and is easy to recirculate along the rotational symmetry axis, and the flow of the liquid in the hollow portion is smoothed as a whole.
(5) On the other hand, unlike the invention according to claim 1, the hollow part is substantially hemispherical and has the maximum radius near the gas inlet, so that when the liquid is reversed, the hollow part is substantially spherical. Although the swirling speed does not increase as much as the case, since the outer diameter of the hollow portion is reduced immediately after reversal, the effect of increasing the swirling speed of the liquid toward the tip of the negative pressure cavity is the same.
(6) As a result, the cross section of the negative pressure cavity is rapidly reduced at a short distance along the rotational symmetry axis, and the shear efficiency of the gas at the microbubble generation point at the tip is increased.

  In addition to the hemispherical shape of the vessel, the overall length in the rotationally symmetric axis direction may be further shortened to have a convex lens shape as a whole. In this case, the overall length of the inner hollow portion in the rotational symmetry axis direction is also shortened, and the distance between the gas inlet and the gas-liquid jet outlet is also shortened, but the angle of the substantially frustoconical side surface with respect to the rotational symmetry axis and the cross-sectional area of the truncated cone top portion. By appropriately changing the above, it is possible to control the height of the conical shape of the negative pressure cavity, and to generate a fine bubble generation point in the vicinity of the gas-liquid jet port.

  Next, a swirl type fine bubble generator according to claim 5 of the present invention is the swivel type fine bubble generator according to claim 4, wherein the gas inlet has the substantially frustoconical side surface as the container. It is characterized by forming a curved surface integral with the body wall surface.

  In the swirl type fine bubble generator according to claim 4, since the cross-sectional area of the hollow portion is the maximum around the gas inlet as described above, there is a possibility that turbulence will occur at the time of reversal of the swirl flow of the liquid. Although it is smaller than the swirl type fine bubble generator according to the above, by making the substantially frustoconical side surface of the gas introduction port a curved surface integrated with the inner wall surface of the hollow portion, the generation of this turbulent flow can be prevented more effectively. it can.

  Next, the swirl type fine bubble generator according to claim 6 of the present invention is the swirl type fine bubble generator according to any one of claims 4 and 5, wherein the gas inlet is the substantially frustoconical shape. A gas introduction pipe that penetrates the outer wall of the container body and is movable back and forth along the rotational symmetry axis direction of the container body.

  Similarly to the swirling fine bubble generator according to the third aspect, by moving the gas introduction tube along the rotational symmetry axis, the position for introducing the gas into the hollow portion can be arbitrarily changed. Thus, the present invention simply and mechanically changes the amount of protrusion into the hollow portion of the gas introduction tube without adopting a method of introducing a gas-liquid mixture whose gas / liquid mixing ratio has been adjusted in advance. Thus, it becomes possible to easily control the generation amount of fine bubbles. Therefore, there is no need for incidental equipment for preparing a gas-liquid mixed liquid in advance and adjusting the mixing ratio, and it is possible to control the generation amount of fine bubbles only with a small and simple apparatus body. .

  According to the present invention, it is possible to realize a swivel type microbubble generator that can efficiently generate microbubbles with a small and simple structure. In this swirling microbubble generator, the gas is automatically sucked into microbubbles by pumping the liquid into the container by an external pump. In particular, when the vessel body is extremely small, it can be operated even at a pressure about the water pressure of tap water, for example, and can be easily incorporated into household equipment such as a water purifier and a shower head. Therefore, this invention has the effect that the application range in a small-scale water environment can be expanded in a turning type fine bubble generator.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a swirling fine bubble generator according to a first embodiment of the present invention. The substantially spherical vessel 10 having a hollow inside has a gas-liquid jet 12 and a gas introduction pipe 13 at a position facing the rotational symmetry axis of the outer wall thereof, and is rotationally symmetric in the vicinity of the gas-liquid jet 12. A pressurized liquid introduction pipe 14 is connected in a direction perpendicular to the axis. FIG. 2 is a front view of the substantially spherical vessel 10 viewed from the gas-liquid jet 12 side.

FIG. 3 is a cross-sectional view of the swirling fine bubble generating device of FIG. The inside of the vessel body 10 is hollow, and the inner wall of the hollow portion forms a smooth spherical inner surface except for the vicinity of the gas inlet 16. On the other hand, the gas introduction port 16 has a substantially truncated cone shape protruding into the hollow portion along the rotational symmetry axis X, and the substantially truncated cone side surface forms a smooth curved surface 16 integrally with the spherical inner surface. Moreover, the gas introduction pipe | tube 13 is provided in the form which penetrates the gas introduction port 11 from the exterior of the container body 10. FIG. The pressurized liquid introduction pipe 14 is connected in the vicinity of the opening of the inner wall of the hollow part of the gas-liquid jet port 12 in the direction perpendicular to the rotational symmetry axis X, and forms a pressurized liquid inlet 15 on the inner wall of the hollow part. Yes.

Prior to the operation of the swirling fine bubble generating device, the hollow portion is filled with a liquid in which the device itself is immersed. When the device is operated, the liquid L fed from the pressurized liquid introducing pipe 14 is introduced into the pressurized liquid. It is newly introduced into the hollow portion through the mouth 15.

The introduced liquid L immediately swirls along the inner wall of the hollow portion, proceeds in the direction of the gas inlet 11 (leftward in FIG. 3), and generates a vortex R. The swirl R swirls with a small radius near the pressurized liquid inlet 15, but swirls with a maximum radius near the center of the hollow portion, and swirls again with a small radius near the gas inlet 11.

The vortex flow R that has reached the curved surface 16 is reversed along the curved surface 16 and proceeds in the right direction along the rotational symmetry axis X while forming a return vortex flow R 'inside the forward vortex flow R. The swirl of the vortex R ′ is in the same direction as the vortex R, but the radius is small, so the swirl speed is larger than that of the vortex R. Therefore, a negative pressure is generated in the liquid L in the hollow portion along the rotational symmetry axis X, and the gas A is sucked into the hollow portion from the gas introduction pipe 13 by the negative pressure, and the negative pressure is generated along the rotational symmetry axis X. A cavity V is generated.

The gas A forming the negative pressure cavity V is rotated by friction with the vortex flow R ′ and proceeds to the right while swirling, but the swirl radius of the vortex flow R ′ becomes smaller as it approaches the gas-liquid jet port 12. Since the turning speed is also increased, the negative pressure cavity V becomes a tapered conical shape. On the outer surface of the negative pressure cavity V, the swirling speed of the gas A is smaller than the swirling speed of the liquid L due to the difference in specific gravity between the gas A and the swirling liquid L ′. A shear effect is generated with respect to the gas A, and a fine bubble generation point P is generated at which the gas A is continuously sheared at the tip of the negative pressure cavity V to form fine bubbles.

Thereafter, the vortex flow R ′ becomes a gas-liquid mixed liquid state containing the fine bubbles MB and is discharged from the gas-liquid jet 12 to the outside of the container, and the fine bubbles MB are diffused into the external liquid.

FIG. 4 is a side view of the swirling fine bubble generating device according to the second embodiment of the present invention. A substantially hemispherical container body 20 having a hollow inside has a gas-liquid jet port 22 and a gas introduction pipe 23 at a position facing the rotational symmetry axis X of the outer wall, and in the vicinity of the gas-liquid jet port 22. A pressurized liquid introduction tube 24 is connected in a direction perpendicular to the rotational symmetry axis X.

FIG. 5 is a cross-sectional view of the swivel type fine bubble generator of FIG. 4 taken along the rotational symmetry axis X. The inside of the vessel body 20 is hollow, and the inner wall of the hollow portion forms a smooth hemispheric inner surface with the gas-liquid jet port 22 at the top, but the gas inlet 21 side is a circular wall body that blocks the bottom surface of the hemisphere. 27. On the other hand, the gas introduction port 21 has a substantially truncated cone shape that protrudes from the wall body 27 into the hollow portion along the rotational symmetry axis X, and smoothly curves from the inner wall of the hollow portion to the side surface of the substantially truncated cone shape through the wall body 27. A surface 26 is formed. Further, a gas introduction pipe 23 is provided so as to penetrate the wall body 27 and the gas introduction port 21 from the outside of the vessel body 20. Further, the pressurized liquid introduction pipe 24 is connected in the vicinity of the opening of the inner wall of the hollow portion of the gas-liquid jet port 22 in the direction perpendicular to the rotational symmetry axis X, and the pressurized liquid inlet 25 is formed in the inner wall of the hollow portion. doing.

  Also in this embodiment, the liquid L pumped from the pressurized liquid introduction pipe 24 by operating the apparatus is newly introduced into the hollow portion through the pressurized liquid introduction port 25, and the generated vortex R swirls in the left direction in the figure. However, the process of proceeding is the same as in the first embodiment.

  In the present embodiment, when the hollow portion has the maximum radius, the vortex flow R reaches the wall body 27, is reversed along the curved surface 26 to become the vortex flow R ′, and the inside of the vortex flow R along the rotational symmetry axis X is aired. It proceeds toward the liquid spout 22. Since the swirl radius is not reduced as in the first embodiment before the vortex R is reversed, the generation of turbulent flow in the vicinity of the gas inlet 21 is suppressed.

  In this embodiment, since the hollow portion is substantially hemispherical and has a short length in the direction of the rotational symmetry axis X, the swirl radius of the vortex R ′ after reversal becomes smaller at a shorter distance than in the first embodiment. As a result, the total length of the generated negative pressure cavity V is also shortened, and the cross-sectional area is narrowed more rapidly than in the first embodiment. Therefore, the swirling speed of the vortex R 'around the negative pressure cavity V is also increased more rapidly than in the first embodiment, and the shear effect on the gas A is sufficiently high at the fine bubble generation point P.

  As described above, when the two embodiments are compared, since the volume of the hollow portion is smaller in the second embodiment than in the first embodiment, the amount of the liquid A swirling in the hollow portion, that is, the inertia weight is naturally small. Therefore, if the pressure for pumping the liquid L into the hollow portion is the same, the second embodiment generates a higher-speed vortex, and the negative pressure of the negative pressure cavity V generated on the rotational symmetry axis X also increases.

  This is also clear from the results of experiments conducted by the inventors of the present invention. FIG. 6 shows an experiment in water using the prototypes of the first embodiment (substantially spherical) and the second embodiment (substantially hemispherical) with the same maximum diameter of the vessel body. The numerical values obtained by measuring the generated negative pressure are tabulated. The output of the pump that pumps water to the prototype was the same.

As a result, the flow rate of water passing through the apparatus is slightly higher than 15 g per second in the first embodiment, but is higher than 23 g per second in the second embodiment, and the smaller second embodiment is more per unit time. The flow rate of was shown to be large.

  In addition, the negative pressure generated in the hollow portion was 0.458 mAq on average as a result of three trials in the first embodiment, whereas 1.04 mAq on average as a result of seven trials in the second embodiment. The value was more than twice.

As a result of the experiment, it was confirmed that even when the liquid was pumped at the same pressure, the second embodiment allowed the liquid L to pass faster than the first embodiment, thereby generating a larger negative pressure in the hollow portion. For this reason, it is considered that the amount of air A that is self-absorbed per unit time is larger in the second embodiment. This is because the amount of microbubbles ejected from the gas-liquid ejection port is also visually observed. It was confirmed from the fact that there were more two embodiments.

From the above, in the swirling fine bubble generating device according to the present invention, it is more preferable in terms of both efficiency and miniaturization of the device that the shape of the hollow portion in the container is substantially hemispherical than spherical.

When the shape of the container is changed, the generation of the fine bubble generation point P at an appropriate position in the vicinity of the hollow portion side of the gas-liquid jet 12 is, as described above, the cone forming the gas inlet 11 This can be realized by controlling the height of the conical shape of the negative pressure cavity V by appropriately changing the angle of the trapezoidal side surface with respect to the rotational symmetry axis X and the cross-sectional area of the top of the truncated cone. FIG. 7 is a partially enlarged view illustrating the relationship between the shape of the frustoconical shape and the shape of the generated negative pressure cavity portion V. The conical shape of the negative pressure cavity portion V has a substantially truncated cone-shaped top portion as a bottom surface, and a conical shape. It was confirmed by the inventors' experiment that the side surface of the negative pressure cavity V is also formed along the extended surface of the trapezoidal side surface.

The embodiment of the swirling fine bubble generator according to the present invention has been described above with reference to the drawings. However, the present invention is not limited to the above embodiment, and the purpose of the improvement or the technical idea of the present invention. Within the scope of the present invention, improvements or modifications are possible and belong to the technical scope of the present invention.

  The present invention is applied to a fine bubble generating device for making a gas into fine bubbles and efficiently dissolving them in a liquid. For example, the present invention is suitable for a water quality improving device that improves the water quality by adding an amount of oxygen in water. The present invention is particularly suitable for a small water quality improvement device built in a domestic water purifier or a shower head because a highly efficient microbubble generator can be realized with a small size and a simple structure.

It is a side view of the turning type fine bubble generator concerning a first embodiment of the present invention. It is a front view of the revolving type fine bubble generator concerning a first embodiment of the present invention. It is sectional drawing of the turning-type fine bubble generator which concerns on 1st embodiment of this invention. It is a side view of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is sectional drawing of the turning type fine bubble generator which concerns on 2nd embodiment of this invention. It is a table | surface of the numerical value of the test result performed using the prototype of the turning type fine bubble generator which concerns on 1st embodiment of this invention, and 2nd embodiment. It is the elements on larger scale which illustrate the change of the shape of the negative pressure cavity part by the shape of a truncated cone.

X Axis of rotation A Gas L Liquid MB Fine bubble R Eddy current (outward)
R 'vortex (return)
V negative pressure cavity 10 vessel (first embodiment)
11 Gas inlet (first embodiment)
12 Gas-liquid spout (first embodiment)
13 Gas introduction pipe (first embodiment)
14 Pressurized liquid introduction pipe (first embodiment)
15 Pressurized liquid inlet (first embodiment)
16 Curved surface (first embodiment)
20 body (second embodiment)
21 Gas inlet (second embodiment)
22 Gas-liquid spout (second embodiment)
23 Gas introduction pipe (second embodiment)
24 Pressurized liquid introduction pipe (second embodiment)
25 Pressurized liquid inlet (second embodiment)
26 Curved surface (second embodiment)
27 Wall body (second embodiment)

Claims (6)

    A substantially spherical container having a hollow portion formed in a rotationally symmetric manner, and an outer wall on one side on the rotationally symmetric axis of the vessel body were formed by projecting into a substantially frustoconical shape in the hollow portion along the rotationally symmetric axis. A gas inlet, a gas-liquid jet opening in the outer wall on the other side on the rotational symmetry axis, and a pressurized liquid inlet opening in the direction perpendicular to the rotational symmetry axis in the vicinity of the gas-liquid jet outlet The gas self-sucked from the gas inlet is made into fine bubbles by the swirling flow of the liquid flowing into the container, and the swirling gas-liquid mixture containing fine bubbles is led out from the gas-liquid jet port. A swirl type fine bubble generator characterized by the above.     2. The swirling fine bubble generating device according to claim 1, wherein a side surface of the substantially frustoconical shape forms a curved surface integrated with the inner wall surface of the gas introduction port.     3. The gas introduction port includes a gas introduction pipe that penetrates the outer wall of the substantially truncated cone shape and is movable back and forth along the rotational symmetry axis direction of the container body. The swirl type fine bubble generator according to any one of the above.     A substantially hemispherical vessel having a hollow portion formed in rotational symmetry, and a gas introduction established by projecting an outer wall on the bottom side of the substantially hemispherical surface of the vessel into a substantially frustoconical shape in the hollow portion along the axis of rotational symmetry A gas-liquid jet port opened on the outer wall on the substantially hemispherical top side on the rotational symmetry axis, and a pressurized liquid inlet port opened in a direction perpendicular to the rotational symmetry axis in the vicinity of the gas-liquid jet port. The gas self-sucked from the gas inlet is made into fine bubbles by the swirling flow of the liquid flowing into the container, and the swirling gas-liquid mixture containing fine bubbles is led out from the gas-liquid jet port. A swirl type fine bubble generator characterized by the above.     5. The swirling fine bubble generating device according to claim 4, wherein a side surface of the substantially frustoconical shape of the gas introduction port forms a curved surface integrated with the wall surface of the body. 6. The gas introduction port includes a gas introduction pipe that penetrates through the outer wall of the substantially truncated cone shape and is movable back and forth along a rotationally symmetric axis direction of the container body. The swirl type fine bubble generator according to any one of the above.

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