Bubble water generating device and bubble water generating method

Abstract

It should be easy to handle drug-resistant solutions, gases, etc., and be able to simply and safely generate a large amount of UFB water containing UFB. 【Solution means】A drive pump 12 that sucks in gas-liquid in a reduced-pressure precipitation state and sends out gas-liquid in a pressurized dissolution state, a first-stage pressurized dissolution UFB generation nozzle 14 and a second-stage pressurized dissolution UFB generation nozzle 16 in which the hole diameters of nozzle ports 14a and 16a are made to be about the same and to which the gas-liquid sent out from the drive pump 12 is supplied step by step, and a first-stage pressurized dissolution production tank 13 and a second-stage pressurized dissolution production tank 23 in which the gas-liquid passing through the nozzle ports 14a and 16a of the UFB generation nozzles 14 and 16 are respectively stored. By alternately repeating the reduced-pressure precipitation state and the pressurized dissolution state of the drive pump 12, generation of bubbles at the UFB generation nozzles 14 and 16 accompanying the pressurized dissolution state and increase in the dissolved gas concentration in the gas-liquid in the production tanks 13 and 23 accompanying the reduced-pressure precipitation state are carried out in multiple stages.

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 Art

[0002] Conventionally, as a device for generating bubble water containing fine bubbles with an extremely small bubble diameter, for example, a piston-type bubble water production device has been proposed (see Patent Document 1 below). This proposal enables the simple and safe production of a large amount of UFB water containing UFB using a syringe and a plunger similar to a syringe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of the above-described piston-type bubble water production device, although a large amount of UFB water can be produced simply and safely, there are limitations in applicable solutions and gases, and in particular, it has been difficult to handle chemical-resistant solutions and gases.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a bubble water generating device and a bubble water generating method capable of easily and safely generating a large amount of UFB water containing UFB and easily handling chemical-resistant solutions, gases, etc.

Means for Solving the Problems

[0006] To achieve the above object, an aspect of the present invention is having a diaphragm pump capable of changing the volume,A driving pump that sucks in gas-liquid under a reduced pressure state and discharges the gas-liquid under a pressurized state, and a plurality of bubble generation nozzle parts having the same hole diameter of nozzle openings, to which the gas-liquid discharged from the driving pump is supplied step by step, having a volume at least comparable to the change amount of the volume of the diaphragm pump, a plurality of bubble generation tanks in which the gas-liquid passing through the nozzle openings of the plurality of bubble generation nozzle parts is respectively stored, and by alternately repeating the reduced pressure state and the pressurized state of the driving pump, generation of bubbles in the plurality of bubble generation nozzle parts accompanying the pressurized state, and an increase in the concentration of dissolved gas in the gas-liquid in the plurality of bubble generation tanks accompanying the reduced pressure state are performed in multiple stages.

[0007] Further, another aspect of the present invention is A method for generating bubble water by the bubble water generating device according to an aspect of the present invention, a first reduced pressure step of sucking in gas-liquid for sending to the first-stage bubble generation nozzle part through a gas-liquid mixing nozzle part as the driving pump is brought into a reduced pressure state; a first pressurization step of passing the gas-liquid through the first-stage bubble generation nozzle part and storing it in the first-stage bubble generation tank as the driving pump is brought into a pressurized state; a second reduced pressure step of increasing the concentration of dissolved gas in the gas-liquid in the first-stage bubble generation tank as the driving pump is brought into a reduced pressure state again; and a second pressurization step of passing the gas-liquid stored in the first-stage bubble generation tank through a second-stage bubble generation nozzle part having a nozzle opening hole diameter approximately the same as that of the nozzle opening of the first-stage bubble generation nozzle part and storing it in the second-stage bubble generation tank as the driving pump is brought into a pressurized state again, characterized by including at least these steps.

Effect of the Invention

[0008] According to the present invention, it is possible to simply and safely generate a large amount of UFB water containing UFB, and to provide a bubble water generation device and a bubble water generation method that can easily handle chemical-resistant solutions, gases, and the like.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, a bubble water generation device and a bubble water generation method according to an embodiment of the present invention will be described. It should be noted that in this embodiment, the drawings schematically show the outline of the invention and are different from the actual ones.

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

[0012] This UFB water generation device 1 is configured to include, for example, as shown in FIG. 1, a UFB generation 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 primary pressure dissolution and generation tank 13, a second-stage secondary pressure dissolution and generation tank 23, a primary pressure dissolution UFB generation nozzle (section) 14, a secondary pressure dissolution UFB generation nozzle (section) 16, a gas-liquid mixing nozzle (section) 19, a gas supply nozzle (section) 22, a gas mixer (gas-liquid mixer) 15, a drive pump 12, and a pump drive section 11, etc.

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

[0015] The gas supply nozzle 22 is for introducing the UFB target gas from the gas supply device 20 from one side surface of the gas mixer 15. In order to make the gas supply ratio about 5% - 30% of the gas-liquid, the hole diameter of the nozzle port connected to the gas inlet of the gas mixer 15 is about 0.3 mmφ.

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

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

[0018] Also, a gas-liquid mixing nozzle 19 is connected to the upper surface of the gas mixer 15. The hole diameter of the nozzle port on the suction side of the gas-liquid mixing nozzle 19 is about 3.0 mmφ so as not to cause resistance when the gas-liquid of the drive pump 12 sucks water (in a reduced pressure precipitation state).

[0019] The gas-liquid mixing nozzle 19 has, for example, as shown in Fig. 2, a floating spherical plug member 19a and a stopper member 19b that restricts the movement (lifting) of the plug member 19a in the direction of the nozzle opening. By this plug member 19a, when draining the gas-liquid from the drive pump 12 (in the pressurized dissolution state), the water injection port on the gas mixer 15 side is blocked so as to prevent the backflow of the gas-liquid to the gas mixer 15 side. Conversely, when sucking the gas-liquid by the drive pump 12 (in the decompression precipitation state), the water injection port on the gas mixer 15 side is opened.

[0020] The drive pump 12 has, for example, a diaphragm pump (also referred to as a diaphragm pump) structure. Although details will be described later, the volume inside the chamber 12d of the drive pump 12 is varied by the pump drive unit 11 so that the gas-liquid suction / drainage operation (pump operation) is performed.

[0021] The drive pump 12 becomes in the decompression precipitation state (during water suction) when the volume inside the chamber 12d is expanded, and becomes in the pressurized dissolution state (during water drainage) when the volume is narrowed, 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 for controlling the backflow of the gas-liquid from the first-stage pressurized dissolution UFB generation nozzle 14 side to the drive pump 12 side during the decompression precipitation state.

[0023] That is, the generation control unit 31 has, for example, as shown in Fig. 2, a floating spherical plug member 31a and a stopper member 31b that restricts the movement (lifting) of the plug member 31a in the direction of the first-stage pressurized dissolution UFB generation nozzle 14. By this plug member 31a, during the decompression precipitation state, the water injection port of the generation control unit 31 on the discharge port side of the drive pump 12 is blocked. Conversely, during the pressurized dissolution state, the water injection port of the generation control unit 31 on the discharge port side of the drive pump 12 is opened.

[0024] The primary pressure dissolution UFB generation nozzle 14 is for generating bubbles by allowing the gas-liquid mixture from the generation control unit 31 to pass through. This primary pressure dissolution UFB generation nozzle 14 has a nozzle opening 14a with approximately the same hole diameter (about 2.0 mm in diameter) as the nozzle opening 16a of the secondary pressure dissolution UFB generation nozzle 16, as shown in FIG. 2, for example.

[0025] In the primary pressure dissolution generation tank 13, when the gas-liquid mixture passes through the nozzle opening 14a of the primary pressure dissolution UFB generation nozzle 14, the UFB water BW in the first-stage pressure dissolution state is generated. This primary pressure dissolution generation tank 13 has a volume (about 6 ml, for example) that is equal to or greater than the variable volume (variable volume amount) 12e of the drive pump 12, that is, it suffices if it has a volume at least the same as the variable volume amount 12e of the drive pump 12, as shown in FIG. 3(a), for example.

[0026] The secondary pressure dissolution UFB generation nozzle 16 is connected in series with the primary pressure dissolution UFB generation nozzle 14 to the primary pressure dissolution generation tank 13. This secondary pressure dissolution UFB generation nozzle 16 is for generating bubbles by allowing the gas-liquid mixture (UFB water BW) in the primary pressure dissolution generation tank 13 to pass through. The secondary pressure dissolution UFB generation nozzle 16 has a nozzle opening 16a with approximately the same hole diameter (for example, the diameter difference is within ±20%) as the primary pressure dissolution UFB generation nozzle 14.

[0027] The nozzle opening 16a of the secondary pressure dissolution UFB generation nozzle 16 is connected to the side surface near the upper surface and below the liquid level of the UFB water BW in the storage tank 30 via the secondary pressure dissolution generation tank 23 and the flow path (water supply pipe) 17, as shown in FIG. 1, for example. When the gas-liquid mixture passes through the nozzle opening 16a of this secondary pressure dissolution UFB generation nozzle 16 and the secondary pressure dissolution generation tank 23, the UFB water BW in the second-stage pressure dissolution state is generated. Also, in the secondary pressure dissolution generation tank 23, the generated UFB water BW is temporarily stored. As the secondary pressure dissolution generation tank 23, it suffices if it has a volume at least the same as the variable volume amount 12e of the drive pump 12, as shown in FIG. 3(a), for example.

[0028] In this embodiment, the hole diameters of the nozzle ports 14a and 16a of the primary pressure dissolution UFB generation nozzle 14 and the secondary pressure dissolution UFB generation nozzle 16 are made substantially the same, and the volumes of the primary pressure dissolution generation tank 13 and the secondary pressure dissolution generation tank 23 are made substantially the same. As a result, at the time of decompression precipitation, it becomes possible to control so that both the primary pressure dissolution generation tank 13 and the secondary pressure dissolution generation tank 23 maintain a normal pressure state. Therefore, due to passing through the primary pressure dissolution UFB generation nozzle 14 in the first stage, the dissolved gas concentration in the gas-liquid that has decreased with the generation of UFB water BW can be recovered by the second stage of generation. Similarly, due to passing through the secondary pressure dissolution UFB generation nozzle 16 in the second stage, the dissolved gas concentration in the gas-liquid that has decreased with the generation of UFB water BW can be recovered by the next first stage of generation.

[0029] That is, if the dissolved gas concentration in the gas-liquid significantly decreases due to 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 generating UFB water BW in the second stage deteriorates. Similarly, if the dissolved gas concentration in the gas-liquid significantly decreases due to the generation of UFB water BW in the second stage and the dissolved gas concentration required for the next first stage of generating UFB water BW is insufficient, the efficiency of generating UFB water BW in the next first stage deteriorates.

[0030] Therefore, in order to raise again the dissolved gas concentration of the UFB water BW present in each of the pressure dissolution generation tanks 13 and 23 due to the generation in the first and second stages, the volumes of the pressure dissolution generation tanks 13 and 23 are made substantially the same as the variable volume amount 12e of the drive pump 12. In this way, at the time of the decompression precipitation state, it becomes possible to maintain the normal pressure state by temporarily stagnating the UFB water BW in each of the pressure dissolution generation tanks 13 and 23.

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

[0032] As shown in FIGS. 3(a) and 3(b), for example, the drive pump 12 includes a cylindrical chamber main body portion 12a having a suction port and a discharge port, a chamber variable portion 12b provided so as to close the opening portion of the chamber main body portion 12a, and a chamber operation portion 12c that operates (deforms) the chamber variable portion 12b.

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

[0034] The chamber variable portion 12b keeps the inside of the chamber 12d in a sealed state, and is capable of changing the volume of the inside of the chamber 12d by being deformed into a convex shape or a concave shape according to the operation of the pump drive portion 11. This chamber variable portion 12b is formed of, for example, a resin member made of silicon, a resin member subjected to fluororesin processing, or a thin metal plate having flexibility that can be deformed into a concave shape or a convex shape.

[0035] As shown in FIG. 3(a), for example, in the drive pump 12, when the chamber operation portion 12c is pulled in the direction of the arrow Xa shown in the figure by the pump drive portion 11, the chamber variable portion 12b is curved into a convex shape so as to expand. As a result, as the volume of the inside of the chamber 12d increases by the variable volume amount 12e (about 6 ml), the inside of the drive pump 12 is brought into a reduced-pressure precipitation state.

[0036] Conversely, as shown in FIG. 3(b), for example, when the chamber operation portion 12c is pushed in the direction of the arrow Xb shown in the figure by the pump drive portion 11, the chamber variable portion 12b returns to its original state (restores to its original state) and shrinks into a concave shape. As a result, as the volume of the inside of the chamber 12d decreases by the variable volume amount 12e and returns to its original state, the inside of the drive pump 12 is brought into 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, gas-liquid also flows into the portion where the volume has increased due to the deformation of the chamber variable part 12b (variable volume amount 12e). Along with this, the dissolved gas concentration in the gas-liquid in the drive pump 12 is increased, and raw materials for generating UFB water BW containing FB (fine bubbles) at the nano level or higher are mass-produced.

[0038] Also, during the pressurized dissolution state, each time gas-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 generated step by step, and the number of generated bubbles is sequentially increased by plus (+).

[0039] In addition, in this embodiment, at least the portion where gas-liquid comes into contact may be formed using materials such as fluororesin, silicone resin, or vinyl chloride that can also handle organic solvents. Or, it is also possible to form it using a material such as stainless steel (SUS) that can withstand acids.

[0040] Also, according to the configuration of this embodiment, UFB water BW can be generated at a pressure within the range of about 0.1 Mpa to 0.5 Mpa.

[0041] Hereinafter, the method for generating (manufacturing) UFB water BW in the UFB water generation device 1 according to this embodiment will be briefly described.

[0042] FIG. 4 shows the generation process of UFB water BW in the UFB water generation device 1 according to this embodiment.

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

[0044] At this time, as the gas-liquid mixture from the gas-liquid mixing nozzle 19 is supplied to the driving pump 12, the UFB target gas from the gas supply nozzle 22 is supplied to the gas mixer 15. Thereby, in the gas mixer 15, the gas-liquid from the storage tank 30 and the UFB target gas having a volume of about 5% to 30% with respect to the gas-liquid are agitated to generate a gas-liquid with a high dissolved gas concentration.

[0045] Next, in the second step (first pressurization step), the pump driving unit 11 is controlled to deform the chamber variable part 12b of the driving pump 12 in the direction of arrow Xb. Thereby, the inside of the driving pump 12 is in a pressure dissolution state, and the gas-liquid is sent to the first-stage pressure dissolution UFB generation nozzle 14.

[0046] In this second step, as the gas-liquid passes through the first-stage pressure dissolution UFB generation nozzle 14, UFB water BW is generated in the first-stage pressure dissolution generation tank 13 and is once stored (reserved).

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

[0048] Similarly, the supply of the UFB target gas from the gas supply nozzle 22 to the gas mixer 15, the supply of the gas-liquid from the gas-liquid mixing nozzle 19 to the driving pump 12, and the recovery (increase) of the dissolved gas concentration by the storage of the UFB water BW in the first-stage pressure dissolution generation tank 13 are performed.

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

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

[0051] In this way, by repeating the above-described first step to the fourth step a predetermined number of times or for a predetermined time, UFB water BW is generated in multiple stages each time the gas-liquid passes through each pressurized dissolution UFB generation nozzle 14, 16, and higher-concentration UFB water BW is stored.

[0052] FIG. 5 illustrates measurement data of the UFB water BW produced by the UFB water generation device 1 according to the present embodiment by a nanoparticle analysis system (NANOSIGHT).

[0053] In FIG. 5, the graph on the left shows the results of the experiment (for example, five times), and the graph on the right shows the average value. In both graphs, the vertical axis represents the FTLA concentration (particles / ml), and the horizontal axis represents the particle size (nm).

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

[0055] As is clear from FIG. 5, according to the UFB water generation device 1 according to the present embodiment, for example, UFB having a peak in particle size per 100 nm can be easily produced into UFB water BW containing 10 UFB water BW containing at a ratio of 1.6×10

[0056] As described above, according to the present embodiment, as the volume of the inside 12d of the chamber of the drive pump 12 changes, the reduced-pressure precipitation state and the pressurized dissolution state are repeated, so that it is possible to easily generate a large amount of UFB water BW containing UFB at a high concentration.

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

[0058] Thereby, in the case where the reduced-pressure precipitation state by increasing the volume of the drive pump 12 and the pressurized dissolution state by decreasing the volume are performed in multiple stages, it is possible to recover the dissolved gas concentration in the gas-liquid decreased by the generation of UFB water BW in the first stage until the generation of UFB water BW in the second stage.

[0059] Therefore, in the second pressurization step, it is possible to raise the dissolved gas concentration in the gas-liquid used for generating UFB water BW again. With only a simple on / off operation of the drive pump 12, a large amount of UFB water BW containing a higher concentration (for example, about 1 billion to 2 billion) of UFB can be generated safely and inexpensively.

[0060] Moreover, it is not only possible to easily handle chemical-resistant solutions and gases without being limited to applicable solutions and gases, but also applicable to organic solvents and acids by limiting the material of at least the portion where gas and liquid come into contact.

[0061] In particular, according to the UFB water generation device 1 according to the present embodiment, miniaturization and cost reduction can be easily achieved, so it is also useful for research experiments and the like.

[0062] Note that the present invention is not limited to the two-stage pressure dissolution type, and it is also possible to use a multi-stage (plural stages) pressure dissolution type UFB water generation device such as a three-stage pressure dissolution type equipped with a pressure dissolution UFB generation nozzle and a pressure dissolution generation tank in the third stage, or a four-stage pressure dissolution type equipped with a pressure dissolution UFB generation nozzle and a pressure dissolution generation tank in the fourth stage.

[0063] The embodiments of the present invention have been described above by way of example. However, the embodiments are merely examples, and the scope of the invention described in the claims can be variously modified without departing from the gist of the invention.

Explanation of Reference Numerals

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

Claims

1. A diaphragm pump capable of changing its volume, a driving pump that sucks gas-liquid under a reduced pressure state and discharges the gas-liquid under a pressurized state, A plurality of bubble generation nozzle parts with the same hole diameter of the nozzle opening, into which the gas-liquid discharged from the driving pump is supplied step by step, A plurality of bubble generation tanks having a volume at least as large as the change amount of the volume of the diaphragm pump, and storing the gas-liquid that has passed through the nozzle openings of the plurality of bubble generation nozzle parts respectively, Comprising: By alternately repeating the reduced pressure state and the pressurized state of the driving pump, generation of bubbles in the plurality of bubble generation nozzle parts accompanying the pressurized state and increase in the dissolved gas concentration in the gas-liquid in the plurality of bubble generation tanks accompanying the reduced pressure state are performed in multiple stages. A bubble water generation device characterized by this.

2. A gas supply device for supplying a predetermined target gas for dissolving in the gas-liquid, A gas mixer for dissolving the predetermined target gas supplied from the gas supply device in the gas-liquid, The bubble water generation device according to claim 1, further comprising:

3. The plurality of bubble generation nozzle parts and the plurality of bubble generation tanks are A first-stage bubble generation nozzle part to which the gas-liquid discharged from the driving pump is supplied, A first-stage bubble generation tank for storing the gas-liquid that has passed through the nozzle opening of the first-stage bubble generation nozzle part, A second-stage bubble generation nozzle part to which the gas-liquid stored in the first-stage bubble generation tank is supplied, A second-stage bubble generation tank for storing the gas-liquid that has passed through the nozzle opening of the second-stage bubble generation nozzle part, The bubble water generation device according to claim 1, characterized in that it is constituted by:

4. A method for generating bubble water by the bubble water generation device according to any one of claims 1 to 3, A first decompression step of sucking gas-liquid for discharging to the first-stage bubble generation nozzle part through a gas-liquid mixing nozzle part as the driving pump is set to a reduced pressure state, A first pressurization step of passing the gas-liquid through the first-stage bubble generation nozzle part and storing it in the first-stage bubble generation tank as the driving pump is set to a pressurized state, A second depressurization step of increasing the dissolved gas concentration of the gas-liquid in the first-stage bubble generation tank as the drive pump is again brought into a depressurized state; A second pressurization step of passing the gas-liquid stored in the first-stage bubble generation tank through a second-stage bubble generation nozzle portion having a nozzle hole diameter approximately the same as that of the nozzle hole of the first-stage bubble generation nozzle portion as the drive pump is again brought into a pressurized state, and storing the gas-liquid in a second-stage bubble generation tank; A bubble water generation method characterized by at least including these steps.

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