KR102165936B1 - Device and Method for manufacturing high concentration fine bubble using ultrasound - Google Patents

Abstract

The present invention relates to an apparatus and method for manufacturing high-concentration microbubbles using ultrasonic waves, and more particularly, by controlling the generation of fog when generating microbubbles using ultrasonic waves, it is possible to manufacture high-concentration microbubbles. The present invention relates to an apparatus and method for manufacturing high-concentration micro-bubbles using ultrasonic waves that can easily produce micro-bubbles having a concentration, can achieve miniaturization through a simple structure, and can produce micro-bubbles in a short time.

Description

Device and method for manufacturing high concentration fine bubble using ultrasound

The present invention relates to an apparatus and method for producing high-concentration microbubbles using ultrasonic waves, and more particularly, by controlling the generation of fog when generating microbubbles using ultrasonic waves, it is possible to manufacture high-concentration microbubbles, and The present invention relates to an apparatus and method for manufacturing high-concentration micro-bubbles using ultrasonic waves that can easily produce micro-bubbles having a concentration of and, can achieve miniaturization through a simple structure, and can produce micro-bubbles in a short time.

Nanobubble water refers to a substance in which gases such as oxygen and hydrogen remain in water as nano-sized bubbles, and is widely used in various fields such as drinking, skin improvement, contaminant purification, and cell culture. For this reason, various devices and methods for manufacturing nanobubbles have been developed, and the following patent document discloses an example of a device for manufacturing nanobubbles using an ultrasonic vibrator.

<Patent Literature>

Patent No. 10-1243012 (2013. 03. 06. Registration) "Micro-cell gun generator"

The properties of the nanobubbles depend on their size and concentration, and even in an application field using the properties of the nanobubbles, they have different efficiencies depending on the size and concentration of the bubbles. For example, when osteoblasts (MC3T3) are cultured in a medium mixed with nanobubbles, it is known that the cell growth rate is higher when the content of nanobubbles is 10% than when the content of nanobubbles is 20%. As such, it is expected that the size and concentration of nanobubbles with optimal or maximum efficiency exist for other applications.

However, the conventional nanobubble manufacturing apparatus has a limitation in that the control of the size and concentration of the bubble is limited. With one device, only bubbles of a fixed size and concentration can be produced, or in a device capable of changing the size, since the concentration is dependent on the size, it is difficult to control the concentration as desired by the user.

The present invention was devised to solve the above problems,

An object of the present invention is to provide an apparatus and method capable of producing high-concentration micro-bubbles by controlling the generation of fog when generating micro-bubbles using ultrasonic waves.

In addition, an object of the present invention is to provide an apparatus and method capable of easily manufacturing microbubbles having various sizes and concentrations.

In addition, an object of the present invention is to provide an apparatus and method capable of miniaturization through a simple structure and manufacturing microbubbles in a short time.

The present invention is implemented by an embodiment having the following configuration in order to achieve the above object.

According to an embodiment of the present invention, an apparatus for producing microbubbles according to the present invention includes a water tank for receiving water; An ultrasonic vibrator that applies ultrasonic waves to water contained in the water tank; And a controller for controlling the operation of the ultrasonic vibrator to control the amount of fog generated when the fine bubbles are generated, thereby adjusting the size and concentration of the fine bubbles contained in water.

According to another embodiment of the present invention, in the microbubble manufacturing apparatus according to the present invention, the controller includes a water supply unit for controlling water to be supplied into the water tank at a predetermined level, and a water surface in the water tank and an upper surface of the water tank The water supply unit is characterized in that a predetermined amount of water is supplied to the water tank so that a predetermined space is formed therebetween to form a predetermined space in which the fog generated on the water surface can be located.

According to another embodiment of the present invention, in the apparatus for producing microbubbles according to the present invention, in order to generate bubbles having a specific size and concentration, the controller applies ultrasonic waves to water according to a previously stored setting table. It characterized in that it comprises a fog control unit that controls the applied operation to control the amount of fog generated when fine bubbles are generated.

According to another embodiment of the present invention, the apparatus for producing microbubbles according to the present invention is characterized in that it includes a position control unit for adjusting a position of the ultrasonic vibrator in a water tank.

According to another embodiment of the present invention, in the microbubble manufacturing apparatus according to the present invention, the fog control unit controls the position control unit to position the ultrasonic vibrator at a specific position in water, and then the power supply unit powers the ultrasonic vibrator for a certain time. It characterized in that it comprises a control module for generating a specific amount of fog by supplying.

According to another embodiment of the present invention, in the apparatus for producing microbubbles according to the present invention, the fog control unit controls the position control unit to position the ultrasonic vibrator at a first position in water, and then the power supply unit controls the position control unit. Time power is supplied so that a certain amount of fog is generated, and the position control unit is subsequently controlled to position the ultrasonic vibrator at the second position in the water, and then the power supply unit supplies power to the ultrasonic vibrator for a certain amount of time. It includes a combination module to generate, the first position and the second position are different from each other, the amount of fog generated when the ultrasonic vibrator is in the first position and the fog generated when the second position The amount is characterized by being different.

According to another embodiment of the present invention, in the microbubble manufacturing apparatus according to the present invention, any of the installation position of the ultrasonic vibrator, the water level, the number of ultrasonic vibrators used, the ultrasonic frequency generated by the ultrasonic vibrator, and the diameter of the ultrasonic vibrator Through one or more adjustments, it is possible to generate or prevent the generation of fog when fine bubbles are generated, and it is possible to control the generation amount of the fog.

According to another embodiment of the present invention, in the microbubble manufacturing apparatus according to the present invention, when fog is generated when fine bubbles are generated by the fog control unit, fine particles having a smaller size and higher concentration than when no fog is generated. It is characterized in that it is possible to generate air bubbles, and when the generation amount of the fog is large, fine bubbles having a smaller size and high concentration than when there is a small amount can be generated.

According to another embodiment of the present invention, a method for producing microbubbles according to the present invention includes a water supply step of supplying water to have a predetermined level in a water tank; After the water supply step, a fog control step of controlling the operation of the ultrasonic vibrator located in the water in the water tank to control the amount of fog generated when fine bubbles are generated, thereby adjusting the size and concentration of the fine bubbles contained in the water. It features.

According to another embodiment of the present invention, in the fog control step in the method for producing microbubbles according to the present invention, after placing the ultrasonic vibrator at a specific position in water, power is supplied to the ultrasonic vibrator for a certain amount of time. It is characterized in that it can be made to occur.

According to another embodiment of the present invention, in the method of manufacturing microbubbles according to the present invention, in the fog control step, after placing the ultrasonic vibrator at a first position in water, power is supplied to the ultrasonic vibrator for a certain amount of time. A certain amount of fog can be generated by allowing fog to be generated and to supply power to the ultrasonic vibrator for a certain period of time after sequentially placing the ultrasonic vibrator at a second position in the water. The first position and the second position Is different from each other, and the amount of fog generated when the ultrasonic vibrator is in the first position and the amount of fog generated when the ultrasonic vibrator is in the second position are different.

The present invention can obtain the following effects by the configuration, combination, and use relationship that will be described below with the present embodiment.

The present invention has the effect of controlling the generation of fog when generating fine bubbles by using ultrasonic waves, thereby producing high-concentration fine bubbles.

In addition, the present invention has the effect of being able to easily manufacture microbubbles having various sizes and concentrations.

In addition, the present invention has the effect of achieving miniaturization through a simple structure and producing microbubbles in a short time.

1 is a schematic configuration diagram of a microbubble manufacturing apparatus according to an embodiment of the present invention.
Figure 2 is a block diagram showing a detailed configuration of the gun controller of Figure 1;
3 and 4 are reference diagrams for explaining a method of manufacturing microbubbles using the microbubble manufacturing apparatus of FIG. 1.
5 is a schematic diagram of an experimental apparatus for explaining a method of manufacturing microbubbles according to another embodiment of the present invention.

Hereinafter, an apparatus and a method for manufacturing high-concentration microbubbles using ultrasonic waves according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the drawings are indicated by the same reference numerals wherever possible. In addition, detailed descriptions of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Unless otherwise defined, all terms in this specification are the same as the general meaning of the term as understood by a person skilled in the art to which the present invention belongs, and in case of conflict with the meaning of the term used in the present specification, According to the definitions used herein.

Referring to Figs. 1 and 4, an apparatus for producing high-concentration microbubbles using ultrasonic waves according to an embodiment of the present invention includes: a water tank 1 for receiving water; An ultrasonic vibrator (2) for applying ultrasonic waves to water contained in the water tank (1); And a controller (3) for controlling the operation of the ultrasonic vibrator (2) to control the amount of fog generated when microbubbles are generated, thereby adjusting the size and concentration of microbubbles in water. Before describing the present invention, a principle and problem of generating microbubbles using a conventional ultrasonic vibrator will be described. An ultrasonic vibrator located in water vibrates water by applying ultrasonic waves to water to generate microbubbles. In this case, the ultrasonic wave has an effect only in a certain range due to the straightness of the ultrasonic wave, and the pressure field generated when the ultrasonic vibrator is operated has different characteristics depending on the height of water. A traveling pressure field is generated near the surface of the ultrasonic vibrator and the generated air bubbles move in a direction away from the vibrator, whereas in a standing wave field that occurs far from the surface of the ultrasonic vibrator. Air bubbles are collected in a specific place at regular intervals. Since the bubbles have a Bjerknes force acting on each other in the wave field of the vibrator, coalescence occurs that increases in size by being combined with each other, resulting in a decrease in concentration. Therefore, it becomes difficult to generate fine bubbles of small size and high concentration. Accordingly, the present invention uses an ultrasonic vibrator to generate a fog above the water surface, that is, to transport the bubbles before the fog is combined, thereby circulating the bubbles throughout the water tank. , It is possible to manufacture small-sized bubbles at high concentration. In addition, the present invention makes it possible to control the size and size of the generated bubbles by controlling the generation (amount) of fog (when there is no or small fog generation, the fusion of microscopic bubbles is more effective than when there are many fog generations. Will have a larger size). In addition, in the present invention, since the bubbles generated by the fog circulate without being combined, desired microbubbles can be generated in a short time. In addition, the present invention is compared to the method of manufacturing small-sized and high-concentration microbubbles using a membrane, etc., the present invention can produce small-sized and high-concentration microbubbles even when using ultrasonic waves, There are possible features.

The water tank 1 is configured to receive water, and includes an inlet passage 11, an outlet passage 12, a circulation passage 13, and a pressurizing portion 14.

The inlet passage 11 has one end in communication with the water tank 1 so that water is supplied into the water tank 1, and a valve 111 for opening and closing the inlet passage 11, the inlet passage ( 11) and a pump 112 for applying a force to move the water into the water tank (1).

The discharge path 12 has one end in communication with the water tank 1 to discharge water in the water tank 1 in which microbubbles are formed, and a valve 121 for opening and closing the discharge path 12, etc. Includes.

The circulation path 13 has one end in communication with the lower end of the water tank 1 and the other end in communication with the upper end of the water tank 1 so that the water in the water tank 1 circulates. It includes a pump 131 and the like to apply a force to move the water through (13).

The pressing part 14 is configured to flow the fog formed on the water surface in the water tank 1, and, for example, a blower or the like may be used. Although not shown, an air inflow path through which external air is introduced may be formed in the water tank 1. Air may be introduced through the air inlet passage, or a specific gas (oxygen, hydrogen gas, etc.) may be introduced.

The ultrasonic vibrator 2 is configured to apply ultrasonic waves to water contained in the water tank 1, and a conventional ultrasonic vibrator may be used. A plurality of the ultrasonic vibrators 2 may be installed in various positions, and may be inserted into the water tank 1 by being fitted with a stopper (not shown). As described above, the ultrasonic vibrator 2 located in the water generates ultrasonic waves to vibrate the water so that micro bubbles are formed in the water, and at the same time, fog (fog) may be formed on the water surface. Depending on various conditions such as the installation location of the ultrasonic vibrator, the water level, the number of ultrasonic vibrators used, the ultrasonic frequency generated by the ultrasonic vibrator, and the diameter of the ultrasonic vibrator, it is possible to prevent or generate fog when fine bubbles are generated. , It is possible to control the generation amount of fog. That is, when the ultrasonic vibrator located in the water is operated, fine bubbles are necessarily generated, but fog may or may not be generated on the surface of the water, and when fog is generated, the generation amount of fog can be adjusted. For example, the closer the ultrasonic vibrator is to the water surface, the more fog is generated.

The controller 3 is configured to control the operation of the ultrasonic vibrator 2 to adjust the amount of fog generated, thereby adjusting the size and concentration of fine bubbles contained in water, and a water supply unit 31 and a water discharge unit (32), a circulation unit 33, a power supply unit 34, a fog control unit 35, a storage unit 36, a control unit 37, and the like.

The water supply unit 31 is configured to control water to be supplied into the water tank 1 at a predetermined level, for example, by controlling the valve 111 to open the inlet passage 11 and the pump 112 for a predetermined time. By operating, water can be supplied to the water tank 1 at a predetermined level. The water supply unit 31 is provided in the water tank 1 so that a predetermined gap is formed between the water surface in the water tank and the upper surface of the water tank, that is, a predetermined space in which the fog generated above the water surface can be formed. It will supply water.

The water discharge unit 32 is configured to control the water containing fine bubbles to be discharged from the water tank 1, for example, by controlling the valve 121 to open the discharge path 12 to contain the fine bubbles. You can let the water drain.

The circulation unit 33 is configured to control the water in the water tank 1 to circulate, and for example, the pump 131 may be controlled to allow the water to circulate through the circulation path 13.

The power supply unit 34 is configured to supply power to operate the ultrasonic vibrator 2.

The fog control unit 35 is configured to control the amount of fog generated by controlling the operation of the ultrasonic vibrator to apply ultrasonic waves to water according to a setting table stored in the storage unit 36 in order to generate bubbles having a specific size and concentration. As such, it includes an adjustment module 351, a combination module 352, and the like. In general, when fog is generated when fine bubbles are generated by the fog control unit 35, fine bubbles having a smaller size and high concentration can be generated than when fog is not generated, and when there is a large amount of fog, when there is a small amount It is possible to generate microbubbles having a smaller size and higher concentration. As described above, it is possible to control the amount of fog generated by the operation of the ultrasonic vibrator in a variety of ways. Hereinafter, the operation of the position control unit 4 for adjusting the position of the ultrasonic vibrator 2 is controlled by the fog control. It will be described as an example that the unit 35 controls and adjusts the size and concentration of the generated fine bubbles by controlling the amount of fog generated. The position control unit 4 is configured to adjust the position of the ultrasonic vibrator 3 in the water tank 1, and if a conventional technology using a motor, a cylinder, etc. can be used, for example, the water tank The cylinder 41 is installed on the lower surface, and the ultrasonic vibrator 2 is installed on the cylinder shaft 411 so that the ultrasonic vibrator 2 moves up and down by the operation of the cylinder 41 so that the position can be adjusted.

The control module 351 controls the position control unit 4 to position the ultrasonic vibrator 3 at a specific position in water, and then the power supply unit 34 supplies power to the ultrasonic vibrator 3 for a certain period of time. A configuration in which a specific amount of fog is generated.In the storage unit 36, information on the amount of fog generated when the ultrasonic vibrator 3 is located in a specific position in water is described, and is generated according to a specific amount of fog. Since information on the size and concentration of the microbubbles are described, the control module 351 controls the operation of the position control unit 4 to control the amount of fog generated, so that microbubbles having a specific size and concentration can be manufactured. have.

The combination module 352 controls the position control unit 4 as shown in FIG. 3 to position the ultrasonic vibrator 3 at a first position in the water, and then the power supply unit 34 turns the ultrasonic vibrator 3 ) By supplying power for a certain period of time to generate a certain amount of fog, and subsequently controlling the position control unit 4 as shown in FIG. 4 to position the ultrasonic vibrator 3 at a second position in the water. After the power supply unit 34 is configured to supply power to the ultrasonic vibrator 3 for a certain amount of time so that a certain amount of fog is generated, the first position and the second position are different from each other, and accordingly, the ultrasonic vibrator 2 The amount of fog generated when is at the first position and the amount of fog generated when at the second position are different. In the storage unit 36, information on the size and concentration of fine bubbles generated when a specific amount of fog is generated and then another amount of fog is generated is described. When a certain amount of fog is generated and then another amount of fog is continuously generated, the size can be adjusted more precisely and fine bubbles of high concentration can be formed.

The storage unit 36 stores a setting table in which the amount of fog to be generated to produce bubbles having a specific size and concentration is matched, and the control unit 37 controls the overall operation of the controller 3 do.

Looking at a method for producing high-concentration microbubbles using ultrasonic waves according to another embodiment of the present invention, the method for producing microbubbles includes a water supply step, a fog control step, and a discharge step.

The water supply step is a step of supplying water to have a certain water level in the water tank 1, for example, opening the valve 111 to open the inlet passage 11 and operating the pump 112 for a certain time Water can be supplied to the water tank 1 at a certain level.

The fog control step controls the operation of the ultrasonic vibrator 2 located in the water in the water tank 1 after the water supply step, and adjusts the amount of fog generated when microbubbles are generated, so that the size of the fine bubbles contained in the water Controlling the concentration of and, for example, in order to form microbubbles having a specific size and concentration, according to the setting table stored in the storage unit 36, the fog control unit 35 applies ultrasonic waves to the water. To control the amount of fogging. In the fog control step, after placing the ultrasonic vibrator 3 in a specific position in water, power is supplied to the ultrasonic vibrator 3 for a certain amount of time so that a specific amount of fog can be generated, and the ultrasonic vibrator 3 After placing it in the first position in the water, power is supplied to the ultrasonic vibrator 3 for a certain amount of time so that a certain amount of fog is generated, and the ultrasonic vibrator 3 is subsequently placed in the second position in the water. By supplying power to (3) for a certain period of time, a certain amount of fog can be generated.

The discharge step is a step of discharging water containing fine bubbles of a desired size and concentration from the water tank 1 after the fog control step. For example, by opening the valve 121 to open the discharge path 12, the fine bubbles are It is possible to allow the contained water to be discharged.

Hereinafter, the present invention will be described in more detail through examples. However, these are only for describing the present invention in more detail, and the scope of the present invention is not limited thereto.

<Example 1> Installation of experimental apparatus

Prepare a rectangular parallelepiped water tank 100, prepare a cover 200 covering the water tank 100 to have a predetermined distance (H) with the water in the water tank 100, and an ultrasonic vibrator ( A) was placed, and an ultrasonic vibrator (B) was placed at a distance of 0.5 cm from the lower surface on the left side of the water tank to prepare an experimental apparatus (see FIG. 5). The water tank has a width (l) of 22.5 cm and a height of 7.5 cm, and the ultrasonic vibrators (A, B) have an excitation frequency of 1.7 MHz, have a diameter of 20 mm, and operate on a power of 48 VDC. In the following, a certain amount of water is put into the water tank 100 and the position of the cover 200 is adjusted so that the distance H between the water and the cover 200 is changed, and the ultrasonic vibrators (A, B) are individually The experiment was carried out by operation.

<Example 2> Confirmation of whether or not fog is generated according to the position change of ultrasonic vibrator and whether or not to transport fine bubbles of the fog

1. Put water into the water tank of the experimental apparatus prepared in Example 1 so that the height was 3 cm, and the cover was positioned so that the distance between the water surface and the cover was 9 cm. Thereafter, after operating the ultrasonic vibrators A and B for 10 minutes, respectively, it was checked whether fog occurred with the naked eye, and the sizes and concentrations of bubbles contained in water and fog were measured, and the results are shown in Table 1. Measurements of the size and concentration of bubbles contained in water and fog were measured using NTA (Nanoparticle Tracking Analysis, Malvern's NS300).

2. Looking at Table 1, it is possible to determine whether or not to generate fog according to the location of the ultrasonic vibrator, and if fog is generated, it can be seen that the size of the fine bubbles can be reduced and the concentration can be increased. It appears to be due to the carrying of fine air bubbles.

When using ultrasonic transducer A When using ultrasonic transducer B Whether fog is generated Occur Not occurring Bubble size in water (nm) 103.9 241.9 Bubble concentration in water (number/ml) 2.4×10 ⁸ 3.48×10 ⁷ Bubble size in fog (nm) 103.4 - The concentration of air bubbles in the fog (number/ml) 1.54×10 ⁹ -

<Example 3> Confirmation of the bubble concentration according to the change in the generated fog

1.Put water into the water tank of the experimental apparatus prepared in Example 1 so that the height is 3 cm, and after placing the cover or removing the cover so that the distance between the water surface and the cover is 9 cm, 4.5 cm, and 0 cm, respectively, ultrasonic vibrator A After operating for 10 minutes, the size and concentration of bubbles contained in water were measured, and the results are shown in Table 2.

2. Looking at Table 2, as the distance between the water surface and the cover narrows, the concentration of air bubbles in water decreases, and when the cover is removed and all the fog is blown away, it can be seen that the concentration of air bubbles in water decreases. , It can be seen that the concentration of air bubbles in water can be controlled by adjusting the volume of the location where fog occurs.

Thickness 9cm 4.5cm in thickness Thickness 0cm Cover removal Air bubbles in water
Concentration (count/ml) 2.4×10 ⁸ 7.9×10 ⁷ 4.67×10 ⁷ 4.62×10 ⁷

<Example 3> Confirmation of control of the size and concentration of microbubbles by different operating conditions

1. Put water into the water tank of the experimental apparatus prepared in Example 1 so that the height was 3 cm, and the cover was positioned so that the distance between the water surface and the cover was 9 cm. Thereafter, the ultrasonic vibrators A and B were operated for 10 minutes, respectively, or the ultrasonic vibrators A were operated for 10 minutes, and the ultrasonic vibrators B were subsequently operated for 10 minutes. Thereafter, the size and concentration of air bubbles contained in water were measured, and the results are shown in Table 3.

2. From Table 3, it can be seen that when only the vibrator A or B is used and when the vibrators A and B are combined, bubbles having different sizes and concentrations can be produced. It can be seen that microbubbles having a concentration of and can be prepared.

Using oscillator A Using oscillator B After using vibrator A, use vibrator B Bubble size (nm) 103.9 241.9 121.1 Bubble concentration (number/ml) 2.4×10 ⁸ 3.48×10 ⁷ 1.79×10 ⁸

In the above, the applicant has described various embodiments of the present invention, but such embodiments are only one embodiment that implements the technical idea of the present invention, and any changes or modifications may be made as long as the technical idea of the present invention is implemented. It should be construed as falling within the scope of

1: water tank 2: ultrasonic vibrator 3: controller
4: position control unit 11: inlet passage 12: discharge passage
13: circuit 14: pressurization unit 31: water supply unit
32: water discharge unit 33: circulation unit 34: power supply unit
35: fog control unit 36: storage unit 37: control unit

Claims (11)

A water tank for accommodating water; An ultrasonic vibrator that applies ultrasonic waves to water contained in the water tank; A controller for controlling the operation of the ultrasonic vibrator to control the amount of fog generated when the fine bubbles are generated, thereby adjusting the size and concentration of the fine bubbles contained in water; Including; a position control unit for adjusting the position of the ultrasonic vibrator in the water tank,
The controller includes a water supply unit for controlling water to be supplied to a predetermined level in the water tank,
The water supply unit supplies a predetermined amount of water to the water tank so that a predetermined space is formed between the water surface in the water tank and the upper surface of the water tank so that a predetermined space in which the fog generated above the water surface can be formed. A device for producing microbubbles. delete The method of claim 1, wherein the controller
In order to generate bubbles having a specific size and concentration, according to a pre-stored setting table, the ultrasonic vibrator comprises a fog control unit for controlling an operation of applying ultrasonic waves to water to adjust the amount of fog generated when fine bubbles are generated. Micro-bubble manufacturing device. delete The method of claim 3, wherein the fog control unit
And a control module for generating a specific amount of fog by controlling the position control unit to position the ultrasonic vibrator at a specific position in water, and then supplying power to the ultrasonic vibrator for a certain time by the power supply unit. Device. The method of claim 3, wherein the fog control unit
After controlling the position control unit to position the ultrasonic vibrator at the first position in the water, the power supply unit supplies power to the ultrasonic vibrator for a certain amount of time so that a certain amount of fog is generated. It includes a combination module for generating a certain amount of fog by allowing the power supply to supply power to the ultrasonic vibrator for a certain period of time after being placed in a second position in water, and the first position and the second position are different from each other. And The amount of fog generated when the ultrasonic vibrator is in the first position and the amount of fog generated when the ultrasonic vibrator is in the second position are different. The method of claim 1,
By adjusting any one or more of the installation location of the ultrasonic vibrator, the water level, the number of ultrasonic vibrators used, the ultrasonic frequency generated by the ultrasonic vibrator, and the diameter of the ultrasonic vibrator, it is possible to prevent or prevent fog from occurring when fine bubbles are generated. And, microbubble manufacturing apparatus, characterized in that it is possible to control the amount of fog generated. delete delete delete delete

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