Micro-nano bubble generating device

Abstract

The embodiment of the present application provides a micro-nano bubble generating device, comprising: a bubble generator, comprising a shell and a porous tube disposed in the shell, a first chamber is formed in the porous tube, a second chamber is formed between the shell and the porous tube, a first inlet, a second inlet and an outlet are provided on the shell, the first inlet is connected to the first chamber, the second inlet is connected to the second chamber, and the outlet is connected to the first chamber or the second chamber; a liquid supply device is connected to one of the first inlet and the second inlet. A gas supply device is connected to the other of the first inlet and the second inlet. The device of the present application can prepare micro-nano bubbles of uniform size.

Description

Technical Field

[0001] The present application relates to the technical field of bubble preparation, and in particular to a micro-nano bubble generating device. Background Art

[0002] Micro-nano bubbles usually refer to bubbles with an internal core diameter of 0.1 micron to 100 microns. Micro-nano bubble water is a milky white water-gas mixture filled with a large number of micro-nano bubbles. In micro-nano bubble water, the presence of micro-nano bubbles not only increases the surface area of ​​the gas-liquid interface, but also the uneven distribution of charge on the surface of micro-nano bubbles ionizes free hydroxyl groups in the liquid, which improves the cleaning effect of micro-nano bubbles to a certain extent. Due to its excellent cleaning and decontamination capabilities, micro-nano bubble water has been used in the fields of skin cleaning, fruit and vegetable washing, and sewage treatment.

[0003] The preparation methods of micro-nano bubble water mainly include the pressurized dissolved gas release method based on changing pressure, the dispersed air method / rotation method based on mechanical shearing, electrolysis based on chemical reaction, ultrasound, etc. Different preparation methods will not only produce micro-nano bubbles with different physical and chemical properties, but also greatly limit the application field of micro-nano bubbles.

[0004] The existing micro-nano bubble generating device has a complex structure, cumbersome use steps, slow micro-nano bubble water generation rate, low concentration of generated bubbles, and easily causes waste of water resources. Summary of the invention

[0005] The purpose of the present application is to provide a micro-nano bubble generating device to solve at least part of the problems pointed out in the above background technology or other similar problems.

[0006] The embodiment of the present application provides a micro-nano bubble generating device, comprising: a bubble generator, comprising a shell and a porous tube disposed in the shell, a first chamber is formed in the porous tube, a second chamber is formed between the shell and the porous tube, a first inlet, a second inlet and an outlet are provided on the shell, the first inlet is communicated with the first chamber, the second inlet is communicated with the second chamber, and the outlet is communicated with the first chamber or the second chamber; a liquid supply device is connected to one of the first inlet and the second inlet. A gas supply device is connected to the other of the first inlet and the second inlet.

[0007] In some embodiments, the liquid supply device is connected to the first inlet to supply liquid to the first chamber; the gas supply device is connected to the second inlet to supply gas to the second chamber; and the outlet is connected to the first chamber to allow the micro-nano bubble water formed in the first chamber to flow out.

[0008] In some embodiments, the liquid supply device is connected to the second inlet to supply liquid to the second chamber; the gas supply device is connected to the first inlet to supply gas to the first chamber; and the outlet is connected to the second chamber to allow the micro-nano bubble water formed in the second chamber to flow out.

[0009] In some embodiments, the porous tube is rotatably disposed within the housing.

[0010] In some embodiments, the micro-nano bubble generating device further includes: a rotation driving device connected to the porous tube and used to drive the porous tube to rotate.

[0011] In some embodiments, the porous tube is a porous glass tube or a porous ceramic tube.

[0012] In some embodiments, the porous tube is detachably connected to the shell.

[0013] In some embodiments, the gas supply device includes an air compressor, and a first regulating valve and a gas pressure gauge connected between the air compressor and the housing.

[0014] In some embodiments, the liquid supply device includes a liquid storage container, and a water suction pump, a booster pump, a second regulating valve and a flow meter connected between the liquid storage container and the shell.

[0015] In some embodiments, the micro-nano bubble generating device further includes: a bubble water storage device, including a liquid storage container, and a third regulating valve connected between the liquid storage container and the outlet.

[0016] The beneficial effects of the embodiments of the present application include:

[0017] 1. In the present application, a porous tube is provided, and the gas is evenly dispersed by the holes of the porous tube and then enters the flowing liquid, thereby forming micro-nano bubble water containing micro-nano bubbles of uniform size;

[0018] 2. This application controls the gas pressure and liquid flow rate by setting a pressure control component and a flow rate control component to achieve the regulation of the concentration and size of the micro-nano bubbles generated by the bubble generator;

[0019] 3. In the present application, a porous tube is rotatably disposed in a shell, and the rotating porous tube has a cutting effect on the bubbles, so that smaller and more uniform micro-nano bubbles can be obtained. The size of the bubbles can be adjusted by controlling the rotation speed of the porous tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. In the drawings:

[0021] Figure 1 is a schematic diagram of a micro-nano bubble generating device according to a first embodiment of the present application;

[0022] Figure 2a and Figure 2b is an electron microscope observation image of a porous tube in an example of the present application;

[0023] Figure 3 is a curve diagram showing the relationship between liquid flow rate and micro-nano bubble diameter;

[0024] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the middle shell;

[0025] Figure 5 yes Figure 4 a cross-sectional view of the middle shell;

[0026] Figures 6a to 6c This is an image of micro-nano bubble water generated by a micro-nano bubble generating device;

[0027] Figure 7 is a schematic diagram of a micro-nano bubble generating device according to a second embodiment of the present application;

[0028] Figure 8 yes Figure 7 Schematic diagram of the middle shell. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0030] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the title, but do not represent the spatial arrangement or time sequence of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the terms listed in association. The terms "comprising", "including", "having", etc. refer to the existence of the stated features, elements, components or components, but do not exclude the existence or addition of one or more other features, elements, components or components.

[0031] In the embodiments of the present application, the singular forms "a", "the", etc. may include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise; in addition, the term "according to" should be understood as "at least partially based on...", and the term "based on" should be understood as "at least partially based on...", unless the context clearly indicates otherwise; in addition, the term "plurality" means two or more, unless otherwise specified.

[0032] The present application provides a micro-nano bubble generating device, including a bubble generator, a liquid supply device and a gas supply device. The bubble generator includes a shell and a porous tube arranged in the shell, and the porous tube is a tubular structure with holes densely distributed on the tube wall. A first chamber is formed in the porous tube, and a second chamber is formed between the shell and the porous tube. It can be understood that the first chamber and the second chamber are connected through the holes of the porous tube. The shell has a first inlet, a second inlet and an outlet, the first inlet is connected to the first chamber, the second inlet is connected to the second chamber, and the outlet is connected to the first chamber or the second chamber.

[0033] The liquid supply device is connected to one of the first inlet and the second inlet to supply liquid (such as water) to one of the first chamber and the second chamber, and the gas supply device is connected to the other of the first inlet and the second inlet to supply gas (such as air) to the other of the first chamber and the second chamber. The gas enters the flowing liquid after being evenly dispersed by the holes of the porous tube to form micro-nano bubble water containing micro-nano bubbles of uniform size, and the micro-nano bubble water flows out from the outlet.

[0034] The implementation of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0035] Figures 1 to 3 This is a schematic diagram of a micro-nano bubble generating device according to the first embodiment of the present application.

[0036] like Figure 1As shown, the liquid supply device 2 is connected to the first inlet 101 of the bubble generator 1 to supply liquid to the first chamber 104. The gas supply device 3 is connected to the second inlet 102 of the bubble generator 1 to supply gas to the second chamber 105. After the gas is dispersed by the holes of the porous tube 12, it enters the liquid flowing in the porous tube 12 (i.e., the first chamber 104) to form micro-nano bubble water containing micro-nano bubbles. The outlet 103 is connected to the first chamber 104, and the micro-nano bubble water formed in the first chamber 104 flows out from the outlet 103. This embodiment cuts (disperses) the gas through the porous tube 12, which is a passive cutting method. Micro-nano bubbles can be generated without additional power supply, and can be used for some large independent devices with high-pressure gas, such as long-distance ships.

[0037] The porous tube 12 has densely distributed pores. The pores of the porous tube 12 have a uniform pore size. The pore size may be less than 50 μm, for example, 1 μm to 50 μm or less than 1 μm. Figure 2a and Figure 2b The electron microscope observation image of the porous tube 12 is shown, wherein Figure 2a This is an electron microscope observation picture with a magnification of 1500 times. Figure 2b This is an electron microscope observation image with a magnification of 3450 times.

[0038] The inventor has found that the gas pressure and liquid flow rate when micro-nano bubbles are generated not only affect the preparation rate of micro-nano bubble water, but also affect the concentration and size of the micro-nano bubbles. Therefore, the concentration and size of the micro-nano bubbles can be controlled by controlling the gas pressure and the liquid flow rate. In order to control the gas pressure and the liquid flow rate, in a feasible technical solution, the gas supply device 3 includes a pressure control component for controlling the gas pressure, and the liquid supply device 2 includes a flow rate control component for controlling the liquid flow rate, so as to control the gas pressure and the liquid flow rate through the pressure control component and the flow rate control component, thereby adjusting or controlling the concentration and size of the micro-nano bubbles generated by the bubble generator 1.

[0039] Alternatively, if Figure 1 As shown, the pressure control assembly includes a first regulating valve 31 and a gas pressure gauge 32. The gas pressure gauge 32 is used to display the pressure of the gas in real time, and the first regulating valve 31 is used to adjust the pressure of the gas. When adjusting the gas pressure, the indication of the gas pressure gauge 32 can be observed while adjusting the first regulating valve 31 until the indication of the gas pressure gauge 32 is the required pressure. With the first regulating valve 31 and the gas pressure gauge 32, gas can be stably supplied at a set gas pressure, thereby helping to obtain micro-nano bubbles of uniform size. For example, the first regulating valve 31 is a needle valve.

[0040] Specifically, Figure 1As shown, the gas supply device 3 further includes an air compressor 33 , which is connected to the second inlet 102 via an air intake line 34 , and a first regulating valve 31 and a gas pressure gauge 32 are disposed on the air intake line 34 .

[0041] Alternatively, if Figure 1 As shown, the flow rate control assembly includes a second regulating valve 21 and a flow meter 22. The flow meter 22 is used to display the flow rate of the liquid in real time, and the second regulating valve 21 is used to adjust the flow rate of the liquid. When adjusting the flow rate, the indication of the flow meter 22 can be observed while adjusting the second regulating valve 21 until the indication of the flow meter 22 is the required flow rate. With the second regulating valve 21 and the flow meter 22, liquid can be stably supplied at a set flow rate, thereby helping to obtain micro-nano bubbles of uniform size. For example, the second regulating valve 21 is a needle valve.

[0042] Among them, based on the flow rate obtained from the flow rate meter 22 and the measured size of the micro-nano bubbles, an analytical model of the liquid flow rate and the diameter of the micro-nano bubbles can be established, so as to obtain the relationship between the flow rate of the liquid and the diameter of the micro-nano bubbles, which is used to guide the flow control system and optimize the micro-nano bubble yield and quality. Figure 3 The figure shows a theoretical curve of liquid flow rate and micro-nano bubble diameter obtained by the inventor through experiments. It can be seen from the curve that the smaller the liquid flow rate, the larger the size of the generated micro-nano bubbles.

[0043] Specifically, Figure 1 As shown, the liquid supply device 2 also includes a liquid storage container 23, a water suction pump 24 and a booster pump 25. The liquid storage container 23 is connected to the first inlet 101 through a liquid inlet pipeline 26, and the water suction pump 24 and the booster pump 25 are respectively connected to the liquid inlet pipeline 26. The water suction pump 24 is used to suck the liquid in the liquid storage container 23 into the liquid inlet pipeline 26 to provide an initial flow rate for the liquid, and the booster pump 25 pressurizes the liquid in the liquid inlet pipeline 26. The second regulating valve 21 and the flow meter 22 are arranged on the liquid inlet pipeline 26. Under the regulation of the second regulating valve 21 and the flow meter 22, the liquid flows into the bubble generator 1 at a specific speed.

[0044] In this embodiment, optionally, the porous tube 12 is a porous glass tube or a porous ceramic tube.

[0045] For example, the wall thickness of the porous tube 12 may be 1 mm, the pore diameter may be about 1 μm to 5 μm, and the porosity may be greater than 90%.

[0046] exist Figure 4 and Figure 5In the example, the housing 11 includes a body 111 and a cover 112, the body 111 is generally a U-shaped structure, the cover 112 is generally a flat plate structure, a first inlet 101 is provided at a generally middle position of the body 111, an outlet 103 is provided at a generally middle position of the cover 112, and a second inlet 102 is provided at a position of the cover 112 deviating from the outlet 103, one end of the porous tube 12 is sealed and plugged with the generally middle position of the body 111, and the other end of the porous tube 12 is sealed and plugged with the generally middle position of the cover 112, so that the interior of the porous tube 12 is a first chamber 104 communicating with the first inlet 101 and the outlet 103, and the annular space between the porous tube 12 and the body 111 is a second chamber 105 communicating with the second inlet 102. The outer periphery of the body 111 and the outer periphery of the cover 112 are connected by bolts to realize the detachable connection between the body 111 and the cover 112, so as to facilitate the replacement of the porous tube 12.

[0047] Alternatively, if Figure 1 As shown, the bubble generator 1 further includes a safety valve 118 for relieving the pressure of the second chamber 105 .

[0048] In this embodiment, optionally, Figure 1 As shown, the bubble water storage device 4 also includes a bubble water storage device 4, which includes a liquid storage container 42 connected to the outlet 103 through a liquid outlet line 41, and the micro-nano bubble water flowing out of the outlet 103 can flow into the liquid storage container 42 to be stored for subsequent use. The bubble water storage device 4 also includes a third regulating valve 43 and a flow rate meter 44 (see Figure 4 ), a third regulating valve 43 and a flow meter 44 are arranged on the liquid outlet pipeline 41, the third regulating valve 43 is used to adjust the flow rate of the micro-nano bubble water, and the flow meter 44 is used to display the flow rate of the micro-nano bubble water.

[0049] Optionally, the outlet 103 of the bubble generator 1 is connected to a wet micro-nano particle size analyzer based on image processing to measure the concentration and quantity of generated micro-nano bubbles. For example, the wet micro-nano particle size analyzer is connected between the outlet 103 of the bubble generator 1 and the bubble water storage device 4.

[0050] Figure 6a-6c An image of micro-nano bubble water is shown, wherein Figure 6b This is an image taken with an ordinary camera of micro-nano bubble water. Figure 6b It is a macroscopic image obtained by taking micro-nano bubble water with a high-speed camera. Figure 6c It is a microscopic image obtained by using a wet micro-nano particle size analyzer to detect micro-nano bubble water. Figure 6c It can be seen that the device of the present application can produce micro-nano bubbles with uniform size and considerable density, and the quality of the obtained micro-nano bubble water is excellent.

[0051] Figures 7 and 8 This is a schematic diagram of a micro-nano bubble generating device according to a second embodiment of the present application.

[0052] like Figure 7 As shown, in this embodiment, the liquid supply device 2 is connected to the second inlet 102 of the bubble generator 1 to supply liquid to the second chamber 105; the gas supply device 3 is connected to the first inlet 101 of the bubble generator 1 to supply gas to the first chamber 104, and the gas is dispersed by the holes of the porous tube 12 and enters the flowing liquid outside the porous tube 12 (i.e., the second chamber 105), forming micro-nano bubble water containing micro-nano bubbles. The outlet 103 is connected to the second chamber 105, and the micro-nano bubble water formed in the second chamber 105 flows out from the outlet 103.

[0053] In a feasible technical solution, Figure 7 As shown, the porous tube 12 is rotatably disposed in the housing 11, so the rotation of the porous tube 12 produces a cutting effect on the bubbles. Compared with the solution in which the porous tube 12 is fixed, smaller and more uniform micro-nano bubbles can be obtained, and the size of the bubbles can be adjusted by controlling the rotation speed of the porous tube 12. According to research, the greater the rotation speed of the porous tube 12, the smaller the size of the obtained micro-nano bubbles.

[0054] In this solution, on the one hand, the porous tube 12 is a porous structure with dense pores, which can disperse the gas to generate bubbles. On the other hand, the continuous rotation of the porous tube 12 shears the generated bubbles, so that the bubbles are separated from the outer wall of the porous tube 12. Since the rotation linear speeds at each separation point are basically the same, the centrifugal force and shear force applied to the bubbles are relatively uniform, so the diameter of the generated micro-nano bubbles is uniform.

[0055] Alternatively, if Figure 7 As shown, the micro-nano bubble generating device further includes a rotation driving device 5 , which is connected to the porous tube 12 and is used to drive the porous tube 12 to rotate.

[0056] Specifically, Figure 7 As shown, the rotation drive device 5 is arranged outside the bubble generator 1, and the rotation drive device 5 includes a servo motor 51, a speed controller 52 and a speed display 53. The motor shaft of the servo motor 51 is connected to the porous tube 12 to drive the porous tube 12 to rotate. The speed controller 52 and the speed display 53 are electrically connected to the servo motor 51 to control and display the speed of the servo motor 51. Figure 7 In the example of , the speed controller 52 and the speed display 53 are integrated into one component. For example, the servo motor 51 can provide a rotational power of 22 to 6500 revolutions per minute.

[0057] Optionally, the porous tube 12 is a porous glass tube or a porous ceramic tube.

[0058] exist Figure 8 In the example, the shell 11 includes a cylinder 113, a base 114 fixed to the bottom of the cylinder 113, and a top cover 115 fixed to the top of the cylinder 113, and the two ends of the cylinder 113 are sealed and connected to the base 114 and the top cover 115 respectively. The porous tube 12 is arranged in the cylinder 113, and the porous tube 12 and the cylinder 113 can be coaxially arranged. The interior of the porous tube 12 is the first chamber 104, and the annular space between the cylinder 113 and the porous tube 12 is the second cavity. The cylinder 113 can be a transparent cylinder 113, such as a glass cylinder 113, so as to observe the generation process of micro-nano bubbles in the second chamber 105. The base 114 and the top cover 115 can be made of metal to improve the overall structural strength.

[0059] Alternatively, if Figure 8 As shown, the first inlet 101 is disposed on the top cover 115, and the porous tube 12 and the first inlet 101 are connected via a rotary joint 116, so that the rotary joint 116 can not only support the rotation of the porous tube 12, but also connect the first inlet 101 with the first chamber 104 inside the porous tube 12 through the through hole inside the rotary joint 116. For example, the first inlet 101 is disposed in the middle part of the top cover 115.

[0060] Alternatively, if Figure 8 As shown, the second inlet 102 is disposed on the base 114 . There may be a plurality of second inlets 102 , and the plurality of second inlets 102 may be arranged at intervals along the circumferential direction of the base 114 .

[0061] Alternatively, if Figure 8 As shown, the outlet 103 is disposed on the top cover 115 , for example, the outlet 103 is disposed at a position of the top cover 115 that is offset from the outlet 103 .

[0062] Alternatively, if Figure 8 As shown, the porous tube 12 and the base 114 are connected via a rotating bracket 117. Specifically, the rotating bracket 117 is rotatably connected to the base 114, and the rotatable bracket 117 is fixedly connected to the porous tube 12. Therefore, the base 114 can support the porous tube 12 to rotate through the rotating bracket 117.

[0063] Alternatively, if Figure 8 As shown, the bubble generator 1 further includes an upper connecting seat 14 and a lower connecting seat 15, and the housing 11 is fixed between the upper connecting seat 14 and the lower connecting seat 15. Specifically, the upper connecting seat 14 and the lower connecting seat 15 relatively fix the base 114 and the top cover 115, for example, the upper connecting seat 14 and the lower connecting seat 15 are connected by a long screw to press the base 114 and the top cover 115 between the upper connecting seat 14 and the lower connecting seat 15, so as to ensure good sealing between the base 114 and the top cover 115 and the cylinder 113.

[0064] The connection relationship between other structures and components of this embodiment, such as the gas supply device 3, the liquid supply device 2, the bubble water storage device 4, and the wet-process micro-nano particle size analyzer, can be arranged with reference to the first embodiment, so they are not repeated here.

[0065] The micro-nano bubbles prepared in the present application can be applied to the fields of surface cleaning, sewage treatment, drug delivery, ship drag reduction, etc.

[0066] The above description is only an embodiment of the present specification and is not intended to limit the present specification. For those skilled in the art, the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification shall be included in the scope of the claims of the present specification.

Claims

1. A micro-nano bubble generating device, characterized in that: include: A bubble generator comprises a shell and a porous tube rotatably arranged in the shell, a first chamber is formed in the porous tube, a second chamber is formed between the shell and the porous tube, a first inlet, a second inlet and an outlet are arranged on the shell, the first inlet is communicated with the first chamber, the second inlet is communicated with the second chamber, and the outlet is communicated with the first chamber or the second chamber; a liquid supply device connected to one of the first inlet and the second inlet; a gas supply device connected to the other of the first inlet and the second inlet; Wherein, the gas supply device comprises a pressure control component for controlling the gas pressure, and the pressure control component comprises a first regulating valve and a gas pressure gauge; the liquid supply device comprises a flow rate control component for controlling the liquid flow rate, and the flow rate control component comprises a second regulating valve and a flow rate gauge; the gas pressure and the liquid flow rate are controlled by the pressure control component and the flow rate control component to adjust or control the concentration and size of the micro-nano bubbles generated by the bubble generator; The shell includes a cylinder, a base fixed at the bottom of the cylinder, a top cover fixed at the top of the cylinder, a rotating joint, and a rotating bracket. The two ends of the cylinder are sealed with the base and the top cover respectively. The porous tube is arranged in the cylinder, the interior of the porous tube is the first chamber, and the annular space between the cylinder and the porous tube is the second chamber; the first inlet is arranged on the top cover, the porous tube and the first inlet are connected by the rotating joint, and the rotating joint connects the first inlet with the first chamber; the second inlet is arranged on the base, and the porous tube and the base are connected by the rotating bracket.

2. The micro-nano bubble generating device according to claim 1, characterized in that: The liquid supply device is connected to the first inlet to supply liquid to the first chamber; The gas supply device is connected to the second inlet to supply gas to the second chamber; The outlet is communicated with the first chamber to allow the micro-nano bubble water formed in the first chamber to flow out.

3. The micro-nano bubble generating device according to claim 1, characterized in that: The liquid supply device is connected to the second inlet to supply liquid to the second chamber; The gas supply device is connected to the first inlet to supply gas to the first chamber; The outlet is communicated with the second chamber to allow the micro-nano bubble water formed in the second chamber to flow out.

4. The micro-nano bubble generating device according to claim 1, characterized in that: Also includes: A rotation driving device is connected to the porous tube and is used for driving the porous tube to rotate.

5. The micro-nano bubble generating device according to any one of claims 1 to 3, characterized in that: The porous tube is a porous glass tube or a porous ceramic tube.

6. The micro-nano bubble generating device according to any one of claims 1 to 3, characterized in that: The porous tube is detachably connected to the shell.

7. The micro-nano bubble generating device according to any one of claims 1 to 3, characterized in that: The gas supply device comprises an air compressor, and the first regulating valve and the gas pressure gauge are connected between the air compressor and the housing.

8. The micro-nano bubble generating device according to any one of claims 1 to 3, characterized in that: The liquid supply device includes a liquid storage container, and a water suction pump and a booster pump connected between the liquid storage container and the shell. The second regulating valve and the flow meter are connected between the liquid storage container and the shell.

9. The micro-nano bubble generating device according to any one of claims 1 to 3, characterized in that: Also includes: The bubble water storage device comprises a liquid storage container and a third regulating valve connected between the liquid storage container and the outlet.

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