JP2010022919A - Microair bubble generating nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microair bubble generating nozzle which can effectively mass-generate microair bubbles through a process to make it more microsized. <P>SOLUTION: This microair bubble generating nozzle 1 is aimed at the generation of microair bubbles by receiving the supply of an aqueous solution obtained by dissolving gases with the help of a gas dissolving device. In addition, the nozzle 1 includes an air bubble outlet hole 17 formed in the circumferential wall of a pressure release chamber 11 with a contact wall surface 15 with which the air bubble is brought into contact, in order to make microsized the air bubbles generated by passing the aqueous solution through an orifice 7 and a netting member 9. The sectional area of a fluid passage 19 arranged around the circumference of the pressure release chamber 11 is made to be almost equal to the sectional area of the air bubble outlet hole 17. Further, an air bubble generation/micronization promoting chamber 21 is installed halfway through an outlet passage leading to an outlet 25 from the fluid passage 19. This chamber 21 has a contact wall surface 27 intended for generating a vortical current in the fluid containing the air bubbles to be ejected from the fluid passage 19 and thus agitating the fluid, as well as promoting the generation of the air bubbles by releasing the pressure and making the air bubble more microsized through bringing the air bubbles into contact with the contact wall surface 27. The contact wall surface 27 is roughened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fine bubble generating nozzle for generating fine bubbles of, for example, a micron unit from dissolved water in which a gas is dissolved in a saturated state, and more specifically, effective stirring of a fluid containing the generated bubbles is effective. The present invention relates to a fine bubble generating nozzle capable of generating a larger number of fine bubbles.

For example, a fine bubble generating nozzle for generating fine bubbles in units of microns from dissolved water in which an appropriate gas such as air is dissolved in a saturated state has already been developed (see, for example, Patent Document 1).
Japanese Patent No. 3782090

  The fine bubble generating nozzle described in Patent Document 1 includes an orifice and a net member in a hollow pipe that receives a supply of dissolved water in which a gas is dissolved in a gas dissolving apparatus, and is generated by passing through the orifice and the net member. The fine bubbles collided with the back wall portion of the fitting pipe attached to the hollow pipe are stirred to subdivide the bubbles. Then, the fluid ejected to the periphery from the communication hole provided in the peripheral wall of the fitting pipe is further released in pressure in an annular space formed around the fitting pipe, and convection and agitation are performed to form bubbles. It is further subdivided.

  In the above configuration, since a large amount of fine bubbles are generated, this is a desirable configuration, but because the configuration is provided with an annular space around the fitting pipe for releasing the fluid pressure and convection and stirring. There is a problem that the overall configuration is relatively large. Further, the annular space convects and stirs the fluid flowing out from the communication hole of the fitting pipe in accordance with the ejection from the communication hole, so that the generated fine bubbles can be further refined more effectively. Further improvement has been demanded for further promoting the generation of fine bubbles.

  The present invention has been made in view of the above-described problems, and is a fine bubble generating nozzle for generating fine bubbles upon receiving supply of dissolved water in which a gas is dissolved in a gas dissolving device, and includes an orifice and a net member In order to refine the bubbles generated by passing through the bubble, a bubble outflow hole is provided in a peripheral wall portion of the pressure release chamber having a contact wall surface that contacts the bubble, and a fluid passage provided around the pressure release chamber is provided. A cross-sectional area is provided approximately equal to the cross-sectional area of the bubble outflow hole, and a vortex is generated in the fluid ejected from the fluid passage in the middle of the outlet passage extending from the fluid passage to the outlet, and stirred and pressure is generated. It is characterized by comprising a bubble generation and refinement promotion chamber having a contact wall surface for releasing bubbles to promote the generation of bubbles and to further reduce the size by contacting the bubbles.

  Further, in the fine bubble generating nozzle, the contact wall portion provided in the bubble generation and refinement promoting chamber is formed in a rough surface.

  According to the present invention, when reaching the bubble generation miniaturization promotion chamber from the bubble outflow hole provided in the peripheral wall portion of the pressure release chamber, the pressure is further released and the vortex is generated and the stirring is effectively performed. It is in contact with the abutting wall portion of the bubble generation and refinement promotion chamber, and further refinement of the bubbles is promoted.

  Referring to FIG. 1, a fine bubble generating nozzle 1 according to an embodiment of the present invention includes a cylindrical nozzle body 3, and a gas dissolving device (not shown) is provided at one end of the nozzle body 3. For example, in order to receive a supply of dissolved water in which an appropriate gas such as air is dissolved in a saturated state, a connector 5 for connecting to the gas dissolving device via an appropriate pipe, hose, etc. is provided. An orifice 7 having an appropriate number of small holes is provided on the downstream side (right side in FIG. 1) of the connector 5, and bubbles generated by passing through the orifice 7 are provided on the downstream side of the orifice 7. Is provided with a net member 9 for miniaturizing the material.

  Furthermore, a cylindrical cap member 13 having a pressure release chamber 11 is provided on the downstream side of the mesh member 9. The cap member 13 is provided with an abutting wall surface 15 against which a fluid that passes through the mesh member 9 and goes straight in the downstream direction abuts. The abutting wall surface 15 is formed on a rough surface having fine irregularities. It is. An appropriate number of bubble outflow holes 17 are provided on the peripheral wall portion of the cap member 13.

  Between the outer peripheral surface of the cap member 13 and the inner peripheral surface of the nozzle body 3, an annular fluid passage 19 through which the fluid flowing out from the bubble outlet hole 17 flows out toward the other end side of the nozzle body 3. Is formed. The fluid passage 19 is formed so that the flow rate of the fluid flowing out from the bubble outflow hole 17 maintains the outflow speed from the bubble outflow hole 17. In other words, the total cross-sectional area of all the bubble outflow holes 17 is substantially equal to the cross-sectional area of the fluid passage 19. Therefore, the fluid flowing out from the pressure release chamber 11 through the bubble outflow hole 17 to the fluid passage 19 is ejected in an annular shape while maintaining a high speed without being released in the fluid passage 19.

  The fluid ejected from the fluid passage 19 contains fine bubbles generated in the pressure release chamber 11. In order to further generate fine bubbles from the fluid ejected from the fluid passage 19 and to promote miniaturization to make the generated bubbles finer, the other end side of the nozzle body 3 has a bubble generation / miniaturization promotion chamber. A discharge pipe 23 with 21 is connected.

  The bubble generation miniaturization promoting chamber 21 is ejected from the fluid passage 19 per unit time in order to further release and agitate the pressure of the fluid ejected from the fluid passage 19 to promote the generation of bubbles. The outlet 25 is formed in a direction substantially perpendicular to the ejection direction of the fluid ejected from the fluid passage 19. An abutting wall surface 27 with which the fluid ejected from the fluid passage 19 directly abuts is provided in the middle of the exit passage where the fluid ejected from the fluid passage 19 reaches the outlet 25. The abutting wall surface 27 is formed on a rough surface having minute irregularities in order to further refine the abutting fine bubbles.

  In the configuration as described above, when dissolved water in which a gas is dissolved in a saturated state is supplied from the gas dissolving apparatus and passes through the orifice 7, the pressure of the dissolved water is released, so that bubbles are generated. The generated bubbles are subdivided by passing through the mesh member 9, generate more bubbles in the pressure release chamber 11, and come into contact with the contact wall 15 of the pressure release chamber 11. Further segmentation takes place.

  The fluid containing bubbles in the pressure release chamber 11 is ejected from the bubble outlet hole 17 to the annular fluid passage 19. Since the cross-sectional area of the fluid passage 19 is substantially equal to the total cross-section of the bubble outlet hole 17, the fluid is substantially equal to the ejection speed ejected from the bubble outlet hole 17 without releasing the pressure in the fluid passage 19. As shown by the arrow, the bubble generation and refinement promotion chamber 21 of the discharge pipe 23 is jetted while maintaining a high speed.

  The pressure of the annular fluid ejected from the fluid passage 19 to the bubble generation and refinement promoting chamber 21 is released, and a part of the fluid is transferred to the back surface of the cap member 13 (the surface opposite to the abutting wall surface 15). A swirling vortex is generated and stirring is performed effectively. Therefore, a turbulent flow is generated in the bubble generation and miniaturization promoting chamber 21, and the generation of fine bubbles is promoted. Then, the fluid abuts against the abutting wall surface 27 on the way to the outlet 25, thereby further promoting the miniaturization of the fine bubbles.

  Accordingly, not only can the overall configuration be reduced in diameter, but also more effective generation of a larger number of finer bubbles having a particle size of a micron can be achieved. In other words, without any improvement to the gas dissolution apparatus, that is, even if the conditions of the dissolved water are the same as before, fine bubbles can be generated more effectively and in larger quantities. is there. Therefore, for example, when fine bubbles of a micron unit are generated in the bath, the milky white color is thicker than before.

  By the way, the present invention is not limited to the embodiment as described above, and can be implemented in other forms by making appropriate changes. For example, as shown in FIG. 2, the discharge pipe 23 may have a configuration similar to that of the cap member 13 and an outlet 25 at the center of the abutting wall surface 27. The fluid passage 19 is not limited to an annular shape, and the fluid passage 19 may be formed only in a portion corresponding to each bubble outflow hole 17 provided in the cap member 13. In this case, the plurality of fluid passages 19 are provided in the circumferential direction along the outer peripheral surface of the cap member 13.

It is a section explanatory view of the fine bubble generating nozzle concerning the embodiment of the present invention. It is a section explanatory view showing another form of a fine bubble generating nozzle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generation nozzle 3 Nozzle main body 5 Connector 7 Orifice 9 Net member 11 Pressure release chamber 13 Cap member 15, 27 Contact wall surface 17 Bubble outflow hole 19 Fluid passage 21 Bubble generation refinement promotion chamber 23 Discharge pipe 25 Outlet

Claims (2)

  A fine bubble generating nozzle for generating fine bubbles by receiving a supply of dissolved water in which a gas is dissolved in a gas dissolving device, wherein the bubbles are generated in order to refine the bubbles generated by passing through an orifice and a net member. A bubble outflow hole is provided in the peripheral wall portion of the pressure release chamber having an abutting wall surface for contacting, and the cross-sectional area of the fluid passage provided around the pressure release chamber is provided approximately equal to the cross-sectional area of the bubble outflow hole, In the middle of the outlet passage from the fluid passage to the outlet, a vortex is generated in the fluid jetted from the fluid passage and stirred, and the pressure is released to promote the generation of the bubble and the bubble abuts. A fine bubble generating nozzle comprising a bubble generation and refinement promoting chamber having a contact wall surface for further miniaturization.   2. The fine bubble generating nozzle according to claim 1, wherein a contact wall portion provided in the bubble generation and refinement promoting chamber is formed on a rough surface.

Images