Bubble water generation device and bubble water generation method

Abstract

To easily and safely generate a large amount of UFB water containing UFB, capable of easily coping with a chemical resistant solution and gas.SOLUTION: A first stage pressure dissolution UFB generating nozzle 14 and a second stage pressure dissolution UFB generating nozzle 16 to which the gas-liquid sent out from the drive pump 12 is supplied in a stepwise manner and in which hole diameters of a nozzle port 14a and a nozzle port 16a are substantially equal to each other, and a first stage pressure dissolution production tank 13 and a second stage pressure dissolution production tank 23 in which the gas-liquid that has passed through the nozzle port 14a and the nozzle port 16a of the UFB generating nozzle 1416 is stored, respectively. The generation of bubbles in the UFB generating nozzle 14,16 associated with the pressurized dissolution state and the increase in the dissolved gas concentration in the gas liquid in the generation tank 13,23 associated with the reduced pressure precipitation state are performed in multiple stages.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bubble water generating device and a bubble water generating method for generating ultra-fine bubble (UFB) water. [Background technology]

[0002] Conventionally, a piston-type bubble water production device has been proposed as a device for generating bubble water containing microbubbles with extremely small particle diameters (see Patent Document 1 below). This proposal uses a syringe and plunger similar to an injector to easily and safely produce a large amount of UFB water containing UFB. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7357957 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the piston-type bubble water production device described above can easily and safely produce large amounts of UFB water, there are limitations on the solutions and gases that can be used, and in particular, there is the problem that it is difficult to use chemical-resistant solutions and gases.

[0005] The present invention has been made in consideration of the above, and its purpose is to provide a bubble water generating device and a bubble water generating method that can easily and safely generate large amounts of UFB water containing UFB, and that can easily handle chemical-resistant solutions and gases. [Means for solving the problem]

[0006] In order to achieve the above object, an aspect of the present invention comprises a drive pump that sucks in gas and liquid under a reduced pressure state and delivers the gas and liquid under a pressurized state, a plurality of bubble generating nozzle sections having nozzle openings with approximately the same diameter, to which the gas and liquid delivered from the drive pump are supplied in stages, and a plurality of bubble generation tanks in which the gas and liquid that have passed through the nozzle openings of the plurality of bubble generating nozzle sections are respectively stored, and is characterized in that by alternately repeating the reduced pressure state and the pressurized state of the drive pump, bubbles are generated in the plurality of bubble generating nozzle sections due to the pressurized state, and the concentration of dissolved gas in the gas and liquid in the plurality of bubble generation tanks due to the reduced pressure state is increased in multiple stages.

[0007] In another aspect of the present invention, the method includes at least the following steps: a first depressurization step in which, as the drive pump is depressurized, gas and liquid are sucked through a gas-liquid mixing nozzle section to be delivered to a first-stage bubble generating nozzle section; a first pressurization step in which, as the drive pump is pressurized, the gas and liquid are passed through the first-stage bubble generating nozzle section and stored in a first-stage bubble generation tank; a second depressurization step in which, as the drive pump is again depressurized, the dissolved gas concentration of the gas and liquid in the first-stage bubble generation tank is increased; and a second pressurization step in which, as the drive pump is again pressurized, the gas and liquid stored in the first-stage bubble generation tank are passed through a second-stage bubble generating nozzle section having a nozzle orifice diameter approximately the same as that of the nozzle orifice of the first-stage bubble generating nozzle section and stored in the second-stage bubble generation tank. [Effects of the Invention]

[0008] According to the present invention, a bubble water generating device and a bubble water generating method can be provided that can easily and safely generate large amounts of UFB water containing UFB, and can easily handle chemical-resistant solutions and gases. [Brief explanation of the drawings]

[0009] [Figure 1]1 is a schematic cross-sectional view showing an example of the configuration of a UFB water generating device to which a bubble water generating device according to one embodiment of the present invention is applied. [Figure 2] 2 is an enlarged view of a UFB generating section in the UFB water generating device shown in FIG. 1. [Figure 3] The figures are shown to explain the pump operation in the UFB water generating apparatus, with Figure (a) being a schematic cross-sectional view in the reduced pressure deposition state, and Figure (b) being a schematic cross-sectional view in the pressurized dissolution state. [Figure 4] 1 is a diagram for explaining the UFB water generating operation (generation method) in the UFB water generating device. FIG. [Figure 5] 1 illustrates exemplary measurement data of UFB water produced by a UFB water generating device. DETAILED DESCRIPTION OF THE INVENTION

[0010] The bubble water generating device and the bubble water generating method according to the embodiment of the present invention will be described below with reference to the drawings. Note that in the present embodiment, the drawings are merely a schematic representation of the outline of the invention and may differ from the actual product.

[0011] One embodiment FIG. 1 is a cross-sectional view showing an example of the configuration of a two-stage pressurized dissolution type UFB water generator (bubble water generator) 1 according to one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the UFB generation section 10.

[0012] As shown in FIG. 1, this UFB water generating device 1 is configured to include a UFB generating unit 10 that generates UFB water BW, a gas supply device (gas cylinder) 20, and a storage tank (storage tank) 30 that stores the UFB water BW.

[0013] The UFB generation unit 10 includes a first-stage pressurized dissolution generation tank 13, which is the first stage, a second-stage pressurized dissolution generation tank 23, a first-stage pressurized dissolution UFB generation nozzle (unit) 14, a second-stage pressurized dissolution UFB generation nozzle (unit) 16, a gas-liquid mixing nozzle (unit) 19, a gas supply nozzle (unit) 22, a gas mixer (gas-liquid mixer) 15, a drive pump 12, and a pump drive unit 11.

[0014] The gas supply device 20 supplies a gas (e.g., air or a chemical-resistant gas) that serves as a raw material for generating UFB, which are nano-level fine bubbles, as a UFB target gas to the UFB generating unit 10. A gas supply nozzle 22 is connected to the gas supply device 20 via a gas supply pipe (gas pipe) 21.

[0015] The gas supply nozzle 22 is used to introduce the UFB target gas from the gas supply device 20 into one side of the gas mixer 15. In order to ensure that the gas supply ratio is approximately 5% to 30% of the gas / liquid ratio, the nozzle opening connected to the gas inlet of the gas mixer 15 has a hole diameter of approximately 0.3 mmφ.

[0016] A flow meter (not shown) may be provided to enable fine adjustment of the gas supply ratio by the gas supply nozzle 22.

[0017] The gas mixer 15 is used to generate gas and liquid, and adjusts the dissolved gas concentration in the UFB water BW or the solution before UFB generation (e.g., pure water or a chemical-resistant liquid) so that it falls within a predetermined range. The other side of the gas mixer 15 is connected to, for example, a side surface near the bottom of the storage tank 30 via a flow path (water supply pipe) 18.

[0018] A gas-liquid mixing nozzle 19 is connected to the top surface of the gas mixer 15. The nozzle opening of the gas-liquid mixing nozzle 19 on the suction port side has a hole diameter of about 3.0 mmφ so as not to create resistance when the drive pump 12 sucks in gas and liquid (in a reduced pressure deposition state).

[0019] 2, the gas-liquid mixing nozzle 19 has a spherical plug member 19a that can float and sink, and a stopper member 19b that limits the movement (floating) of the plug member 19a toward the nozzle opening. When gas and liquid are discharged from the drive pump 12 (pressurized dissolution state), the plug member 19a closes the water inlet on the gas mixer 15 side to prevent the gas and liquid from flowing back toward the gas mixer 15 side. Conversely, when gas and liquid are absorbed by the drive pump 12 (depressurized deposition state), the water inlet on the gas mixer 15 side is opened.

[0020] Drive pump 12 has, for example, a diaphragm pump structure. As will be described in detail later, pump drive unit 11 varies the volume of chamber interior 12d of drive pump 12, thereby performing gas / liquid suction / discharge operations (pumping operations).

[0021] The drive pump 12 enters a reduced pressure deposition state (when absorbing water) by expanding the volume of the chamber interior 12d, and enters a pressurized dissolution state (when discharging water) by narrowing the volume, which corresponds to returning to the original state.

[0022] A generation control unit 31 is provided at the discharge port of the drive pump 12. This generation control unit 31 is used to control the backflow of gas and liquid from the first-stage pressurized dissolution UFB generation nozzle 14 side to the drive pump 12 side during reduced pressure deposition.

[0023] 2, the generation control unit 31 has a spherical plug member 31a that can float and sink, and a stopper member 31b that restricts the movement (floating) of the plug member 31a toward the first-stage pressurized dissolution UFB generation nozzle 14. The plug member 31a closes the water inlet of the generation control unit 31 on the discharge port side of the drive pump 12 during the reduced pressure deposition state. Conversely, the water inlet of the generation control unit 31 on the discharge port side of the drive pump 12 is opened during the pressurized dissolution state.

[0024] The first-stage pressurized dissolution UFB generating nozzle 14 generates bubbles by passing gas and liquid from the generation control unit 31. This first-stage pressurized dissolution UFB generating nozzle 14 has a nozzle opening 14a with approximately the same hole diameter (approximately 2.0 mmφ) as the nozzle opening 16a of the second-stage pressurized dissolution UFB generating nozzle 16, as shown in FIG.

[0025] In the first-stage pressurized dissolution generation tank 13, UFB water BW is generated in a first-stage pressurized dissolution state by passing gas and liquid through the nozzle port 14a of the first-stage pressurized dissolution UFB generation nozzle 14. As shown in Figure 3(a), for example, the volume of this first-stage pressurized dissolution generation tank 13 (approximately 6 ml) is equal to or greater than the variable volume (variable volume amount) 12e of the drive pump 12. In other words, it is sufficient if the tank has a volume at least equal to the variable volume amount 12e of the drive pump 12.

[0026] A second-stage UFB generating nozzle 16 is connected in series with the first-stage UFB generating nozzle 14 to the first-stage pressurized dissolution tank 13. This second-stage UFB generating nozzle 16 generates bubbles by passing gas and liquid (UFB water BW) through the first-stage UFB generating tank 13. The second-stage UFB generating nozzle 16 has a nozzle opening 16a with approximately the same hole diameter as the first-stage UFB generating nozzle 14 (for example, a diameter difference of within ±20%).

[0027] As shown in FIG. 1, the nozzle port 16a of the two-stage pressurized dissolution UFB generation nozzle 16 is connected to a side surface near the top of the storage tank 30, below the liquid level of the UFB water BW, via a two-stage pressurized dissolution tank 23 and a flow path (water supply pipe) 17. Gas and liquid pass through the nozzle port 16a of the two-stage pressurized dissolution UFB generation nozzle 16 and the two-stage pressurized dissolution tank 23, thereby generating UFB water BW in a second-stage pressurized dissolution state. The generated UFB water BW is temporarily stored in the two-stage pressurized dissolution tank 23. The two-stage pressurized dissolution tank 23 may have a volume at least equal to the variable volume 12e of the drive pump 12, as shown in FIG. 3(a), for example.

[0028] In this embodiment, the nozzle openings 14a, 16a of the first-stage UFB generation nozzle 14 and the second-stage UFB generation nozzle 16 are approximately the same in diameter, and the volumes of the first-stage UFB generation tank 13 and the second-stage UFB generation tank 23 are approximately the same. This allows the first-stage UFB generation tank 13 and the second-stage UFB generation tank 23 to be controlled to maintain normal pressure during reduced pressure precipitation. Therefore, the dissolved gas concentration in the gas-liquid mixture, which decreased with the generation of UFB water BW after passing through the first-stage UFB generation nozzle 14, can be restored by the time of the second-stage generation. Similarly, the dissolved gas concentration in the gas-liquid mixture, which decreased with the generation of UFB water BW after passing through the second-stage UFB generation nozzle 16, can be restored by the time of the next first-stage generation.

[0029] That is, if the dissolved gas concentration in the gas-liquid mixture is significantly reduced by the generation of UFB water BW in the first stage, and the dissolved gas concentration required for the generation of UFB water BW in the second stage is insufficient, the efficiency of the generation of UFB water BW in the second stage will deteriorate. Similarly, if the dissolved gas concentration in the gas-liquid mixture is significantly reduced by the generation of UFB water BW in the second stage, and the dissolved gas concentration required for the generation of UFB water BW in the next first stage will be insufficient, the efficiency of the generation of UFB water BW in the next first stage will deteriorate.

[0030] Therefore, in order to again increase the dissolved gas concentration of the UFB water BW present in each pressurized dissolution generation tank 13, 23 by the first and second stage generation, the volume of each pressurized dissolution generation tank 13, 23 is set to be approximately the same as the variable volume amount 12e of the drive pump 12. In this way, during the reduced pressure precipitation state, by temporarily stagnating the UFB water BW in each pressurized dissolution generation tank 13, 23, it is possible to maintain a normal pressure state.

[0031] Figure 3 is shown to explain the operation of the drive pump 12 in the UFB water generating device 1, where Figure 3(a) is a schematic cross-sectional view in the reduced pressure precipitation state, and Figure 3(b) is a schematic cross-sectional view in the pressurized dissolution state.

[0032] As shown in Figures 3(a) and (b), the drive pump 12 is composed of a cylindrical chamber main body 12a having an intake port and an exhaust port, a chamber variable portion 12b arranged to cover the opening of the chamber main body 12a, and a chamber operating portion 12c that operates (deforms) the chamber variable portion 12b.

[0033] In the drive pump 12, the nozzle opening of the gas-liquid mixing nozzle 19 is connected to the suction port of the chamber main body 12a, and the injection port of the generation control unit 31 is connected to the discharge port.

[0034] Chamber variable part 12b keeps chamber interior 12d sealed, and is capable of changing the volume of chamber interior 12d by being deformed into a convex or concave shape in response to the operation of pump drive part 11. Chamber variable part 12b is formed from a material that can be deformed into a convex or concave shape, such as a silicone resin material, a fluororesin-coated resin material, or a flexible metal thin plate.

[0035] 3(a), for example, when the chamber operating part 12c is pulled in the direction of the arrow Xa by the pump driving part 11, the chamber variable part 12b is curved into a convex shape so as to expand. As a result, the volume of the chamber interior 12d increases by the variable volume amount 12e (approximately 6 ml), and the inside of the drive pump 12 is put into a reduced pressure precipitation state.

[0036] 3(b), for example, when chamber operating portion 12c is pushed in the direction of arrow Xb by pump driving portion 11, chamber variable portion 12b contracts into a concave shape to return to its original state (restores its original state). As a result, the volume of chamber interior 12d decreases by variable volume amount 12e and returns to its original state, and the inside of drive pump 12 enters a pressurized dissolution state.

[0037] That is, by alternately repeating the reduced pressure precipitation state and the pressurized dissolution state, during the reduced pressure precipitation state, the gas and liquid also flow into the portion (variable volume 12e) whose volume has increased due to the deformation of the chamber variable part 12b. As a result, the concentration of dissolved gas in the gas and liquid in the drive pump 12 increases, and raw materials for producing UFB water BW containing FB (fine bubbles) of nano-level or larger are mass-produced.

[0038] Furthermore, during the pressurized dissolution state, each time the gas and liquid passes through the first-stage pressurized dissolution UFB generation nozzle 14 and the second-stage pressurized dissolution UFB generation nozzle 16, a larger amount of UFB water BW is produced in stages, and the number of bubbles generated is successively increased (+).

[0039] In this embodiment, at least the portion that comes into contact with the gas and liquid may be made of a material that is compatible with organic solvents, such as fluororesin, silicone resin, or PVC. Alternatively, it may be made of a material that is compatible with acids, such as stainless steel (SUS).

[0040] Furthermore, according to the configuration of this embodiment, UFB water BW can be produced at a pressure within a range of approximately 0.1 MPa to 0.5 MPa.

[0041] A method for producing (manufacturing) UFB water BW in the UFB water producing apparatus 1 according to this embodiment will be briefly described below.

[0042] FIG. 4 shows the steps of producing UFB water BW in the UFB water producing apparatus 1 according to this embodiment.

[0043] That is, in the first step (first decompression step), pump drive unit 11 is controlled to deform chamber variable unit 12b in the direction of arrow Xa in order to drive drive pump 12. As a result, the inside of drive pump 12 is brought into a decompression and precipitation state, and gas and liquid are supplied from gas mixer 15 side.

[0044] At this time, as gas and liquid are supplied from gas-liquid mixing nozzle 19 to drive pump 12, UFB target gas is supplied from gas supply nozzle 22 to gas mixer 15. As a result, in gas mixer 15, the gas and liquid from storage tank 30 and the UFB target gas, whose volume is about 5% to 30% of the gas and liquid, are mixed, and gas and liquid with a high dissolved gas concentration is produced.

[0045] Next, in the second step (first pressurization step), the pump drive unit 11 is controlled to deform the chamber variable portion 12b of the drive pump 12 in the direction of arrow Xb. This puts the inside of the drive pump 12 into a pressurized dissolution state, and gas and liquid are sent to the first-stage pressurized dissolution UFB generation nozzle 14.

[0046] In this second step, the gas and liquid pass through the first-stage pressurized dissolution UFB generation nozzle 14, whereby UFB water BW is generated in the first-stage pressurized dissolution generation tank 13 and temporarily stored (accumulated).

[0047] Next, in the third step (second decompression step), similar to the first step described above, pump drive unit 11 is again controlled to deform chamber variable unit 12b of drive pump 12 in the direction of arrow Xa. As a result, the inside of drive pump 12 is brought into a decompression and precipitation state, and gas and liquid are supplied from gas mixer 15 side.

[0048] Similarly, UFB target gas is supplied to the gas mixer 15 from the gas supply nozzle 22, and gas and liquid are supplied to the drive pump 12 from the gas-liquid mixing nozzle 19, and the dissolved gas concentration is restored (increased) by storing UFB water BW in the first-stage pressurized dissolution generation tank 13.

[0049] Next, in the fourth step (second pressurization step), similar to the second step described above, the pump drive unit 11 is again controlled to deform the chamber variable portion 12b of the drive pump 12 in the direction of arrow Xb. This causes the inside of the drive pump 12 to enter a pressurized dissolution state, and gas and liquid are sent to the first-stage pressurized dissolution UFB generation nozzle 14 via the generation control unit 31, and gas and liquid are supplied from the first-stage pressurized dissolution generation tank 13 to the second-stage pressurized dissolution UFB generation nozzle 16.

[0050] Therefore, in this fourth step, as the gas-liquid passes through the first-stage pressurized dissolution UFB generation nozzle 14, UFB water BW is generated in the first-stage pressurized dissolution production tank 13, and as the gas-liquid passes through the second-stage pressurized dissolution UFB generation nozzle 16, UFB water BW is generated in the second-stage pressurized dissolution production tank 23.

[0051] In this way, the above steps 1 to 4 are repeated a predetermined number of times or for a predetermined period of time, so that UFB water BW is produced in multiple stages each time the gas and liquid passes through each pressurized dissolution UFB generating nozzle 14, 16, and higher concentration UFB water BW is stored.

[0052] FIG. 5 illustrates measurement data obtained by a nanoparticle analysis system (NANOSIGHT) of UFB water BW produced by the UFB water production apparatus 1 according to this embodiment.

[0053] In Figure 5, the graph on the left shows the experimental results (e.g., five experiments), and the graph on the right shows the average values. In both cases, the vertical axis represents FTLA concentration (particles / ml) and the horizontal axis represents particle size (nm).

[0054] Note that Figure 5 shows the results when UFB water BW is produced using, for example, 150 ml of pure water (WE200) as the solution, a production time of 10 minutes, and a final number of UFBs produced of 3.79E+09 / ml.

[0055] As is clear from FIG. 5, the UFB water generating apparatus 1 according to this embodiment can generate UFB having a particle size peak around 100 nm in a volume of 1.6×10 10 UFB water BW containing 500mg of lecithin at a ratio of 500mg / ml can be easily produced.

[0056] As described above, according to this embodiment, by changing the volume of the chamber interior 12d of the drive pump 12, a reduced pressure precipitation state and a pressurized dissolution state are repeated, making it possible to easily produce a large amount of UFB water BW containing a high concentration of UFB.

[0057] That is, the drive pump 12 of the UFB generation section 10 that generates the UFB water BW has a diaphragm pump structure, the hole diameter of the nozzle opening 14a of the first-stage, first-stage pressurized dissolution UFB generation nozzle 14 and the hole diameter of the nozzle opening 16a of the second-stage, second-stage pressurized dissolution UFB generation nozzle 16 are made approximately the same, and the volume of the first-stage, first-stage pressurized dissolution generation tank 13 and the volume of the second-stage, second-stage pressurized dissolution generation tank 23 are made equal to or greater than the variable volume amount 12e of the drive pump 12.

[0058] As a result, when a reduced pressure precipitation state by increasing the volume of the drive pump 12 and a pressurized dissolution state by decreasing the volume are carried out in multiple stages, it is possible to restore the dissolved gas concentration in the gas-liquid that was reduced by the production of UFB water BW in the first stage by the time UFB water BW is produced in the second stage.

[0059] Therefore, in the second pressurization step, it is possible to again increase the dissolved gas concentration in the gas-liquid used to produce UFB water BW, and by simply turning the drive pump 12 on and off, large amounts of UFB water BW containing a higher concentration of UFBs (e.g., approximately 1 to 2 billion UFBs) can be produced safely and inexpensively.

[0060] Moreover, there is no restriction on the applicable solutions or gases, and it is possible to easily accommodate chemical-resistant solutions and gases, and by limiting the material of at least the part that comes into contact with the gas or liquid, it can also be used with organic solvents and acids.

[0061] In particular, the UFB water generating apparatus 1 according to this embodiment can be easily made smaller and cheaper, making it useful for research and experiments.

[0062] In addition, the UFB water generation device is not limited to the two-stage pressurized dissolution type, but can also be a multi-stage (multiple stage) pressurized dissolution type, such as a three-stage pressurized dissolution type equipped with a third-stage pressurized dissolution UFB generation nozzle and pressurized dissolution production tank, or a four-stage pressurized dissolution type equipped with a fourth-stage pressurized dissolution UFB generation nozzle and pressurized dissolution production tank.

[0063] The above describes aspects of the present invention by illustrating embodiments, but the embodiments are merely examples, and the scope of the invention described in the claims can be modified in various ways without departing from the gist of the invention. [Explanation of symbols]

[0064] 1...UFB water generator (bubble water generator) 10...UFB generation section 11...Pump drive unit 12...Drive pump (diaphragm pump) 12b...Chamber variable section 12e...Variable volume 13...First stage pressurized dissolution tank 14...First stage pressurized melting UFB generating nozzle (part) 14a...Nozzle opening 15...Gas mixer (gas-liquid mixer) 16...Two-stage pressurized melting UFB generating nozzle (part) 16a...Nozzle opening 17...Flow path (water pipe) 19...Gas-liquid mixing nozzle (part) 20...Gas supply device (gas cylinder) 22...Gas supply nozzle (part) 23...Two-stage pressurized dissolution tank 30...Reservoir 31...Generation control unit BW…UFB water

Claims

1. a drive pump that sucks in gas and liquid under reduced pressure and delivers the gas and liquid under pressurized pressure; a plurality of bubble generating nozzle portions, each having a nozzle opening with approximately the same hole diameter, to which the gas and liquid delivered from the drive pump are supplied in stages; a plurality of bubble generating tanks in which the gas and liquid that have passed through the nozzle ports of the plurality of bubble generating nozzle units are stored, respectively; Equipped with This bubble water generating device is characterized by the fact that by alternately repeating the reduced pressure state and the pressurized state of the drive pump, bubbles are generated in the multiple bubble generating nozzle sections due to the pressurized state, and the dissolved gas concentration in the gas-liquid in the multiple bubble generation tanks due to the reduced pressure state is increased in multiple stages.

2. 2. The bubble water generating device according to claim 1, wherein the drive pump is a diaphragm pump whose volume is variable.

3. 3. The bubble water generating device according to claim 2, wherein each of the plurality of bubble generating tanks has a volume equal to or greater than the volume change of the drive pump.

4. a gas supply device that supplies a predetermined target gas to be dissolved in the gas-liquid; a gas mixer for dissolving a predetermined target gas supplied from the gas supply device in the gas-liquid mixture; The bubble water generating device according to claim 1, further comprising:

5. The plurality of bubble generating nozzle units and the plurality of bubble generating tanks are a first-stage bubble generating nozzle portion to which the gas and liquid delivered from the drive pump are supplied; a first-stage bubble generation tank in which the gas and liquid that has passed through the nozzle port of the first-stage bubble generation nozzle portion is stored; a second-stage bubble generating nozzle portion to which the gas / liquid stored in the first-stage bubble generating tank is supplied; a second-stage bubble generation tank in which the gas and liquid that has passed through the nozzle port of the second-stage bubble generation nozzle portion is stored; 2. The bubble water generating device according to claim 1, characterized in that it is configured by:

6. a first depressurization step of sucking gas and liquid to be delivered to the first-stage bubble generating nozzle section via the gas-liquid mixing nozzle section as the drive pump is brought into a depressurized state; a first pressurizing step in which, as the drive pump is brought into a pressurized state, the gas-liquid is passed through the first-stage bubble generating nozzle portion and stored in the first-stage bubble generating tank; a second depressurization step in which the drive pump is again brought into a depressurized state, thereby increasing the dissolved gas concentration of the gas-liquid in the first-stage bubble generation tank; a second pressurizing step in which, as the drive pump is again pressurized, the gas-liquid stored in the first-stage bubble generation tank is passed through a second-stage bubble generation nozzle part having a nozzle orifice diameter approximately the same as that of the nozzle orifice of the first-stage bubble generation nozzle part, and stored in the second-stage bubble generation tank; A method for generating bubble water, comprising at least the steps of:

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