JP6108209B2 - Fine bubble generation nozzle - Google Patents

Description

  The present invention relates to a fine bubble generating nozzle that discharges fine bubbles generated from a gas-liquid mixture in which a gas is dissolved in a liquid.

  In recent years, microbubble mixed liquids containing microbubbles generated by this type of fine bubble generating nozzle have been used for environmental hygiene such as water purification, industrial applications such as solid removal by floating separation, and water used for hydroponics. It is used for agricultural purposes such as improving dissolved oxygen. In addition, it has come to be used in various industries for sterilization, deodorization, health promotion effect on human body, and the like.

  As the fine bubble generating nozzle, those described in Patent Documents 1, 2, 3 and the like are known.

  However, the fine bubble generating nozzles of Patent Documents 1, 2, and 3 have a problem that the structure is complicated and the parts are complicated to disassemble and replace.

  The present invention has been made in view of the above-described problems, and its purpose is, for example, a fine bubble generating nozzle that facilitates parts replacement work for changing the injection speed of a liquid containing fine bubbles and disassembly and cleaning. Is to provide.

In order to achieve the above object, the invention of claim 1 is directed to reducing the pressure of a gas-liquid mixed solution in which a gas is dissolved in a liquid to deposit gas from the gas-liquid mixed solution, generating bubbles, A fine bubble generating section that generates fine bubbles by refining the liquid and a discharge section that discharges from the discharge port a fine bubble mixed liquid in which the generated fine bubbles are mixed with the gas-liquid mixed liquid, The flow path for flowing the liquid mixture includes a cylindrical outer peripheral wall forming portion that forms an annular outer peripheral wall of the flow path, and an annular inner shape of the flow path that is provided inside the outer peripheral wall forming portion. The gas-liquid mixed liquid is formed by a frustoconical inner peripheral wall forming portion that forms a peripheral wall and has a reverse tapered shape in which a cross-sectional area in a direction perpendicular to the discharge direction gradually increases toward the discharge port. The opening cross-sectional area of the annular hollow in the direction orthogonal to the discharge direction of the In fine bubble generating nozzle which is fence, the outer peripheral wall forming portion includes a feature that you cross-sectional area in a direction orthogonal to the ejection direction is the reverse taper gradually increases toward the discharge port To do.

In the present invention, the cylindrical outer peripheral wall forming portion forms an annular outer peripheral wall of the flow path, and a reverse taper in which a cross-sectional area in a direction orthogonal to the discharge direction gradually increases toward the discharge port. It has become. Furthermore, the frustoconical inner peripheral wall forming portion is provided inside the outer peripheral wall forming portion to form an annular inner peripheral wall of the flow path, and the cross-sectional area in the direction orthogonal to the discharge direction is the discharge port It has a reverse taper that gradually increases toward. As a result, in the flow path constituted by the outer peripheral wall and the inner peripheral wall, the degree of narrowing gradually toward the discharge port increases, and the degree of taper that the opening cross-sectional area gradually decreases toward the discharge port increases. . As a result, it is possible to obtain a specific effect that the flow rate of the gas-liquid mixture is further increased and the fineness is further increased .

It is a schematic perspective view which shows the structure of the fine bubble generation nozzle which concerns on this embodiment. It is sectional drawing of the direction orthogonal to the discharge direction of the fine bubble generation nozzle which concerns on this embodiment. It is the figure seen from the nozzle discharge port of the fine bubble generation nozzle of this embodiment. (A) is the sectional view on the AA line of FIG. 2, (b) is the sectional view on the BB line of FIG. It is sectional drawing which shows the modification 1 of the fine bubble generation nozzle of this embodiment. It is sectional drawing which shows the modification 2 of the fine bubble generation nozzle of this embodiment.

Hereinafter, an example of the fine bubble generating nozzle according to the embodiment of the present invention will be described.
FIG. 1 is a schematic perspective view showing a configuration of a fine bubble generating nozzle according to the present embodiment. FIG. 2 is a cross-sectional view in a direction orthogonal to the discharge direction of the fine bubble generating nozzle according to the present embodiment. FIG. 3 is a view as seen from the nozzle outlet of the fine bubble generating nozzle of the present embodiment. 4A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4B is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 1 to 4, the fine bubble generating nozzle 1 of the present embodiment includes a fine bubble generating unit 10 and a fine bubble mixed liquid discharge unit 20. The fine bubble generating unit 10 includes an outer peripheral wall forming unit 13 having an outer peripheral wall 12 constituting an annular hollow channel 11 and a frustoconical inner peripheral wall forming unit 15 having an inner peripheral wall 14 configuring the channel 11. And. And the fixing member 16 which is joined to the outer peripheral wall formation part 13 and to which the inner peripheral wall formation part 15 is fixed by a cantilever is provided. The end portion of the inner peripheral wall forming portion 15 is fastened to the central portion of the fixing member 16. A part of the outer peripheral wall 12 of the outer peripheral wall forming portion 13 is provided with an inflow port 17 through which a gas-liquid mixed liquid obtained by pressure-dissolving a gas flows. The inflow direction of the inflow port 17 has a predetermined angle with respect to the direction toward the discharge port 21 of the fine bubble mixed liquid discharge unit 20. As a result, the gas-liquid mixed solution that has flowed in from the gas-liquid mixed solution supply pipe 18 that communicates with the inlet 17 through the inlet 17 circulates around the flow path 11 constituted by the outer peripheral wall 12 and the inner peripheral wall 14. It flows while rotating in a shape (indicated by an arrow in FIG. 1).

  And the longitudinal direction cross-sectional shape of the outer peripheral wall formation part 13 becomes a reverse taper toward the discharge outlet 21, as FIG. 2 shows. Further, the cross-sectional area of the inner peripheral wall forming portion 15 in the longitudinal direction also has a cross-sectional area in a direction orthogonal to the discharge direction gradually increasing toward the discharge port 21. That is, it is tapered toward the discharge port 21. As a result, the annular hollow channel 11 in the direction orthogonal to the direction toward the discharge port 21 is formed in the discharge port as can be seen from FIGS. 2, 3, 4 (a) and 4 (b). The opening cross-sectional area gradually decreases toward 21 and becomes tapered. Therefore, the flow path 11 constituted by the outer peripheral wall 12 and the inner peripheral wall 14 is gradually narrowed toward the discharge port 21.

Next, how the fine bubbles are generated in the fine bubble generating nozzle of the present embodiment will be described.
The gas-liquid mixed solution in which the gas is dissolved under pressure is introduced at a high speed with a predetermined angle with respect to the direction from the inlet 17 toward the discharge port 21 of the fine bubble mixture discharge unit 20. Then, it flows at high speed while rotating around the annular hollow channel 11 narrowing toward the discharge port 21. As a result, the flow rate of the gas-liquid mixture increases from the inflow port 17 toward the discharge port 21, and the pressure gradually decreases accordingly. In the gas-liquid mixed solution, a gas dissolved in the liquid is deposited. The generated bubbles flow to the discharge port 21 while passing through a place near the outer peripheral wall 12 and the inner peripheral wall 14. The bubbles of the gas-liquid mixed solution temporarily stick to the outer peripheral wall 12 and the inner peripheral wall 14. The bubbles are torn and split by the circumferential flow. While repeating this division, it flows toward the discharge port and is miniaturized. A fine bubble mixed liquid containing fine bubbles is discharged from the discharge port 21. In the present invention, a liquid in which a gas is dissolved and / or a liquid in which bubbles are mixed is used as the gas-liquid mixture.

  Thus, in the fine bubble generating nozzle of the present embodiment, the cylindrical inner peripheral wall forming portion 15 that forms the flow path 11 has a cross-sectional area in a direction orthogonal to the discharge direction that gradually increases toward the discharge port. It has become. The inner peripheral wall forming portion 15 is provided inside the outer peripheral wall forming portion 13 to form the annular hollow channel 11. Accordingly, the largest outer diameter of the inner peripheral wall forming portion 15 is smaller than the inner diameter of the cylindrical outer peripheral wall forming portion 13 at the discharge port 21. As a result, for example, when it is desired to change the target diameter of the fine bubbles, only the inner peripheral wall forming portion 15 can be removed from the fixing member 16 and taken out from the discharge port 21 without removing the outer peripheral wall forming portion 13 once. Therefore, for example, parts replacement work for changing the injection speed of the liquid containing fine bubbles and disassembly work for performing disassembly and cleaning are simplified.

  Further, in the fine bubble generating nozzle of the present embodiment, an annular hollow channel 11 having an opening cross-section that gradually decreases in a continuous or stepwise manner is constituted by an outer peripheral wall 12 and an inner peripheral wall 14. For this reason, the bubbles of the gas-liquid mixed solution move between a location close to the outer peripheral wall 12 and a location close to the inner peripheral wall 14. For this reason, the bubbles of the gas-liquid mixed liquid moving in a place close to the outer peripheral wall in the annular hollow channel 11 are refined, and the gas moving in a place near the inner peripheral wall 14 in the annular hollow channel 11 is reduced. Bubbles in the liquid mixture are also refined. Thereby, almost all the bubbles are made finer. Therefore, the number of bubbles of the gas-liquid mixture to be subdivided increases. It is possible to suppress variation in the size of bubbles in the gas-liquid mixture discharged from the discharge port. Therefore, it is possible to increase the amount of fine bubbles having a target diameter. Contamination efforts in natural closed water areas such as dams, lakes, rivers, inner bays, etc. have become a social problem, and the fine bubble generating nozzle of this embodiment is used in a method for purifying polluted water quality. And the fine bubble discharged in water from the fine bubble generation nozzle floats in water, and the filth in polluted water is made to adhere to the fine bubble. By collecting the entire layer of fine bubbles that have risen, it is possible to remove the filth and purify the water.

  In the fine bubble generating nozzle of the present embodiment, the cross section in the discharge direction of the flow path 11 constituted by the outer peripheral wall 12 and the inner peripheral wall 14 is tapered toward the discharge port 21. Both the outer peripheral wall forming portion 13 and the inner peripheral wall forming portion 15 are reversely tapered. However, the outer peripheral wall 12 or the inner peripheral wall 14 may be tapered toward the discharge port 21. That is, the cross-sectional shape in the longitudinal direction of the outer peripheral wall forming portion 13 or the cross-sectional shape in the longitudinal direction of the inner peripheral wall forming portion 15 only needs to be inversely tapered. In addition, at least one surface of the outer peripheral wall 12 or the inner peripheral wall 14 is roughened into an uneven shape. Thereby, refinement | miniaturization of a bubble increases further.

  FIG. 5 is a cross-sectional view showing a first modification of the fine bubble generating nozzle of the present embodiment. The cross-sectional view of FIG. 5 shows a cross section in a direction orthogonal to the direction toward the discharge port 21. As shown in the figure, the diffuser 30 is detachably attached to the end portion on the discharge port side of the inner peripheral wall forming portion 15 with screws 31 of fastening means. The diffuser 30 is provided with a diffusion guide portion 32 that bends in a direction substantially perpendicular to the discharge direction along the discharge port 21. The fine bubble mixture discharged from the discharge port 21 is guided by the flow path of the diffusion guide portion 32 and diffused in the outer circumferential direction. Although the diffusion guide part 32 of the diffuser 30 of the modification 1 shown in FIG. 5 diffuses the fine bubble mixed liquid from the discharge port 21 in a substantially vertical outer circumferential direction, it has a target acute angle. May be diffused in the outer circumferential direction.

  FIG. 6 is a partially enlarged view showing a modified example 2 of the fine bubble generating nozzle of the present embodiment. As shown in the figure, the discharge port 21 has an acute angle aimed in the outer circumferential direction with respect to a virtual line 22 (indicated by a dotted line in the figure) that is a line extending along the taper direction of the inner peripheral wall 14. Bent at θ. As a result, the fine bubble mixture is discharged along the inner peripheral wall 14 and is diffused in the outer circumferential direction with a target acute angle θ.

  The inner peripheral wall forming portion 15 shown in FIGS. 2 and 5 is fastened to the fixing member 16 by fastening means of the screw portion 16a, and can be easily attached and detached. As a result, when it is desired to increase the discharge speed of the fine bubble mixed liquid from the discharge port, the increase rate of the cross-sectional area in the longitudinal direction of the inner peripheral wall forming portion 15 is increased. As a result, the opening cross-sectional area in the direction orthogonal to the direction toward the discharge port 21 of the annular hollow channel 11 becomes smaller than when the inner peripheral wall forming portion 15 shown in FIGS. 2 and 5 is attached. . The flow path 11 between the outer peripheral wall 12 and the inner peripheral wall 14 becomes narrower toward the discharge port 21. As described above, the opening of the discharge port can be easily reduced, and the discharge speed can be easily adjusted by replacing the inner peripheral wall forming portion 15. Further, by replacing the inner peripheral wall forming portion 15 according to the target size of the fine bubbles, it is possible to easily generate the fine bubbles having the target size.

  As described above, the fine bubble generating nozzle according to the present embodiment can easily generate a large amount of fine bubbles while easily replacing parts and having a simple structure. And the fine bubble mixed liquid can be diffused in a wide range from the discharge port. Therefore, it can be expected to be effectively used to improve water quality degradation in closed water areas such as dams, rivers, lakes, and inner bays, fish farms and aquariums.

Examples of the fine bubble generating nozzle of the present invention will be described below.
The discharge part of the magnet pump MD-70RZ manufactured by Iwaki and the gas-liquid mixture supply pipe 18 of the fine bubble generating nozzle 1 shown in FIG. 1 of the present invention were connected by a hose. A gas flow was introduced by connecting a three-prong plug provided with a gas inlet valve to this hose. The liquid supplied from the liquid inlet of the magnet pump and discharged from the magnet pump discharge part flows through the hose, the gas flows in from the three-pronged plug, and the gas-liquid mixture flows into the fine bubble generating nozzle of the present invention. Then, the gas was refined inside the tapered flow path, and the fine bubble mixture was discharged from the discharge port 21 of the fine bubble mixture discharge part 20 of FIG. Since the liquid used was a liquid mixed with organic matter, the fine bubble generating nozzle was washed after use. In order to clean the inside of the nozzle, the flow path forming unit 15 in FIG. 1 was rotated and removed from the fixing member 16. The inner wall surface of the fine bubble generating nozzle and the outer wall surface of the flow path forming unit 15 were washed with a brush. Decomposition could be done easily.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect 1)
Reducing the pressure of the gas-liquid mixed solution in which the gas is dissolved in the liquid to precipitate the gas from the gas-liquid mixed solution, generating bubbles, and generating fine bubbles by refining the bubbles to generate fine bubbles; A discharge portion that discharges from the discharge port the fine bubble mixed liquid in which the generated fine bubbles are mixed with the gas-liquid mixed liquid, and the flow path for flowing the gas-liquid mixed liquid is an annular shape of the flow path A cylindrical outer peripheral wall forming portion that forms an outer peripheral wall of the flow passage, and an annular inner peripheral wall of the flow path that is provided inside the outer peripheral wall forming portion and that is orthogonal to the discharge direction. A circular cone-shaped hollow formed in a direction perpendicular to the discharge direction of the gas-liquid mixture is formed by a frustoconical inner peripheral wall forming portion having a reverse taper whose cross-sectional area gradually increases toward the discharge port. In the fine bubble generation nozzle whose opening cross-sectional area is gradually reduced, Kigaishu wall forming portion is for the cross-sectional area in a direction perpendicular to the discharge direction, characterized in that it is reverse taper gradually increases toward the discharge port.
According to this, as described in the above embodiment, the cylindrical outer peripheral wall forming portion 13 forms an annular outer peripheral wall of the flow path 11 and has a cross-sectional area in a direction orthogonal to the discharge direction. Has a reverse taper that gradually increases toward the discharge port. Further, the frustoconical inner peripheral wall forming portion 15 is provided inside the outer peripheral wall forming portion to form an annular inner peripheral wall of the flow path, and has a cross-sectional area perpendicular to the discharge direction. It has a reverse taper that gradually increases toward the exit. As a result, in the flow path constituted by the outer peripheral wall and the inner peripheral wall, the degree of narrowing gradually toward the discharge port increases, and the degree of taper that the opening cross-sectional area gradually decreases toward the discharge port increases. . As a result, the flow rate of the gas-liquid mixture becomes faster and the refinement is further increased.
(Aspect 2)
In (Aspect 1), there is provided a liquid flow generating means for causing the gas-liquid mixed liquid to flow into the flow path at an angle with respect to the discharge direction, and causing the gas-liquid mixed liquid to flow circumferentially within the flow path. According to this, as described in the above embodiment, it flows at high speed while rotating around the annular hollow channel 11 that narrows toward the discharge port 21 in a circular shape. As a result, the flow rate of the gas-liquid mixture increases from the inflow port 17 toward the discharge port 21, and the pressure gradually decreases accordingly. In the gas-liquid mixed solution, a gas dissolved in the liquid is deposited. The generated bubbles flow to the discharge port 21 while passing through a place near the outer peripheral wall 12 and the inner peripheral wall 14.
( Aspect 3)
(Embodiment 1) or (Embodiment 2) in Oite detachably provided with a discharge diverter for changing the discharge direction in the direction of the aim of discharging fine bubble mixture. According to this, as described in the first modification of the above embodiment, it can be diffused in the outer circumferential direction.
(Aspect 4)
In either of (Aspect 1) or ( Aspect 2) , with respect to a virtual line extending from the discharge port along the inner peripheral wall constituting the flow path so as to change the discharge direction for discharging the fine bubble mixed liquid to the target direction The inner peripheral wall of the discharge port is bent at an acute angle. According to this, as described in the second modification of the above embodiment, the outer circumferential direction can be diffused.
(Aspect 5)
In (Aspect 1), the surface of at least one of the outer peripheral wall and the inner peripheral wall constituting the flow path is roughened. According to this, as described in the above embodiment, the surface of at least one of the outer peripheral wall 12 or the inner peripheral wall 14 is roughened to be uneven. Thereby, the refinement | miniaturization of a bubble increases further and it can suppress further the variation in the magnitude | size of the bubble in a gas-liquid liquid mixture.

DESCRIPTION OF SYMBOLS 1 Fine bubble generating nozzle 10 Fine bubble generating part 11 Flow path 12 Outer peripheral inner wall 13 Housing 14 Inner peripheral inner wall 15 Flow path forming part 16 Fixing member 17 Inlet 18 Gas-liquid mixed liquid supply pipe 20 Fine bubble mixed liquid discharge part 21 Exit 22 Virtual line 30 Diffuser 31 Screw 32 Diffusion guide

Japanese Patent No. 4636420 Japanese Patent Laid-Open No. 2007-020779 JP 2010-022919 A

Claims (5)

Reducing the pressure of the gas-liquid mixed solution in which the gas is dissolved in the liquid to precipitate the gas from the gas-liquid mixed solution, generating bubbles, and generating fine bubbles by refining the bubbles to generate fine bubbles; A discharge portion that discharges from the discharge port the fine bubble mixed liquid in which the generated fine bubbles are mixed with the gas-liquid mixed liquid, and the flow path for flowing the gas-liquid mixed liquid is an annular shape of the flow path A cylindrical outer peripheral wall forming portion that forms an outer peripheral wall of the flow passage, and an annular inner peripheral wall of the flow path that is provided inside the outer peripheral wall forming portion and that is orthogonal to the discharge direction. A circular cone-shaped hollow formed in a direction perpendicular to the discharge direction of the gas-liquid mixture is formed by a frustoconical inner peripheral wall forming portion having a reverse taper whose cross-sectional area gradually increases toward the discharge port. In the fine bubble generation nozzle whose opening cross-sectional area is gradually reduced,
The fine bubble generating nozzle according to claim 1, wherein the outer peripheral wall forming portion has a reverse taper in which a cross-sectional area in a direction orthogonal to a discharge direction gradually increases toward the discharge port. The fine bubble generating nozzle according to claim 1,
Finely equipped with a liquid flow generating means for causing the gas-liquid mixed liquid to flow into the flow path at an angle with respect to the discharge direction, and for causing the gas-liquid mixed liquid to flow circumferentially in the flow path. Bubble generating nozzle . In the fine bubble generating nozzle according to 請 Motomeko 1 or 2,
A fine bubble generating nozzle comprising a discharge direction changer for detachably changing a discharge direction for discharging the fine bubble mixed liquid to a target direction. In the fine bubble generating nozzle according to claim 1 or 2 ,
The inner peripheral wall of the discharge port is bent at an acute angle with respect to a virtual line extending from the discharge port along the inner peripheral wall constituting the flow path so as to change the discharge direction for discharging the fine bubble mixed liquid to the target direction. A nozzle for generating fine bubbles, characterized in that The fine bubble generating nozzle according to claim 1,
A fine bubble generating nozzle, wherein the surface of at least one of an outer peripheral wall and an inner peripheral wall constituting the flow path is roughened.

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