KR20150066157A - Device For Generating Micro-Bubbles - Google Patents

Abstract

The present invention relates to an economical apparatus for generating micro-bubbles. According to the present invention, the apparatus comprises: a motor pump having an inlet port and an outlet port; a water inlet unit coupled to the inlet port, and equipped with an air supply unit installed to be branched at a certain position in a longitudinal direction to communicate with the water inlet; and an air dissolution unit coupled to the outlet port, and equipped with a corrugated pipe at a certain position in a longitudinal direction.

Description

Device For Generating Micro-Bubbles

More particularly, the present invention relates to an apparatus for producing micro-bubbles in water used in a living field such as a water treatment process, an agricultural field such as hydroponic cultivation, a marine aquaculture field, and a bathing facility.

Typically, bubbles in water are divided into milli bubbles, micro bubbles, micro nano bubbles, or nano bubbles depending on their sizes.

The micro bubbles are relatively large bubbles having a diameter of 1 mm or more and rapidly rise in water and eventually rupture at the water surface and disappear. The micro bubbles are bubbles having a diameter ranging from 1 mm to 1 μm, Since it is fine, the retention time in water is long and the gas dissolving power is excellent, which is very useful. Micro-nano bubbles or nano-bubbles refer to bubbles having a size smaller than 1 탆 and smaller in diameter than micro-bubbles.

Herein, microbubbles (hereinafter, referred to as "microbubbles") have a long residence time in water and excellent solubility, and their use ranges vary. For example, when removing suspended solids from a supernatant containing suspended solids such as green algae, the coagulation sedimentation method is usually applied. When the inclusion rate of the green algae with a relatively low specific gravity is high, the sedimentation rate is slowed, The suspended solids contained in the water may be transferred to the next process to cause a problem. In this case, a pressurization and floatation method using micro-bubbles, A method in which an apparent specific gravity is reduced and solid-liquid separation is carried out) is applied to effectively remove suspended matters.

In order to keep the dissolved oxygen concentration in the water high in the wastewater treatment or aquaculture, when using the air diffuser, relatively large air bubbles on the millibars are supplied to the water. However, when supplying the small air bubbles having a small particle diameter, The surface area is increased much more and the residence time in the water becomes longer, which is more effective.

In general, two methods are used to generate micro-bubbles in water. One of them is to mix gas such as water and air into a certain space and apply a shear force to the mixture to divide the gas into fine particles, Korean Patent No. 10-1119211 entitled " Apparatus for Producing Fine Particles and Micro-bubbles and System using the same, " and Korean Patent No. 10-1144921 entitled "Micro-bubble generator and system using the same, One is a method in which gases such as water and air are mixed together and the pressure is applied to dissolve an excess amount of gas in water and then the supersaturated gas is precipitated when the pressure applied to the solution is removed. 10-1166457 "A micro-bubble removing device having a two-stage composite structure of a vortex generating part and a vortex removing part and a micro- The method "and Korea Patent No. 10-1058165 call" micro-bubble generator, and the control device "is disclosed, respectively.

Although the former method can relatively easily make the micro-particle trapping device, it has a structure for making bubble water by passing water through a nozzle having a relatively small diameter, thereby limiting the passing water quantity, And the amount of air dissolved in the bubble water is relatively small, so that after the air mixture is ejected through the ejection opening, the amount of deposition as new-born bubbles is reduced by using suspended solids in the water as a nucleus, There is no problem.

In the latter method, the pressurizing pump, the air compressor, and the pressurizing tank are provided at the same time, and then pressurized water and compressed air are supplied into the pressurized tank, respectively, to dissolve the air excessively in the water, The air is sucked into the pressurizing pump by using the suction force of the pressurizing pump instead of using the air compressor and then mixed with water to be supplied into the pressurizing tank There is also.

The goal of improving the efficiency of the apparatus in such an apparatus is to produce a large quantity of sufficiently saturated bubbles, and the economical efficiency of the apparatus is to minimize the volume of the pressurized tank, the total resistance at the time of fluid passage, Korean Patent No. 10-1166457 and Korean Patent No. 10-1058165 disclose that a disturbance plate, a disturbance device or a special pipe is installed inside a pressurizing tank so that the air in the water in the pressurizing tank is subjected to shear force discloses methods capable of reducing the capacity of the pressurizing tank by increasing the contact speed of air with water by making the contact area between air and water so as to be finely divided by a shearing force.

However, the above-described method not only involves a problem of cost increase due to the fabrication of a tank having a complicated structure, but also involves a problem in that, in a part of the space inside the tank, Is relatively large, the flow velocity is slowed and the dispersed air particles are recombined to reduce the contact area with water, resulting in a spatial efficiency deterioration.

Separately, U.S. Patent No. 8,302,942 discloses a method in which water and air are pressurized together using an air feeder and a pressurizing pump, air is passed through a gas diffusing pipe and a relatively long booster pipe, Soluble in water and then decompressing the pressurized water to produce fine bubbles.

In the aforementioned U.S. Patent No. 8,302,942, water and air are passed through a long-length booster tube with built-in diffuser to maintain a constant flow rate in a state where a certain degree of turbulence is generated, so that continuous shearing force is applied to air bubbles in the water Thereby limiting the size of the air bubbles and increasing the rate of air dissolution.

However, in the above-mentioned method, a straight tube type "booster tube" is used as an air-dissolving space, and a flow near the steady flow is formed inside the tube, and the degree of turbulence is relatively weak, There is a falling problem.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus for producing fine bubbles capable of manufacturing a fine bubble collector with a low manufacturing cost and a simple structure with a simple structure.

It is another object of the present invention to provide a microbubble generator capable of stably and quantitatively generating microbubbles.

It is another object of the present invention to provide a microbubble generator capable of producing a large number of microcapsules with a small power by minimizing fluid resistance.

It is another object of the present invention to provide a micro bubble generator which is easy to operate and has high economic efficiency.

According to another aspect of the present invention, there is provided a water pump comprising: a motor pump having an inlet and an outlet; a water inflow part coupled to the suction port side and having an air supply part provided in a predetermined position in the longitudinal direction, And an air dissolving unit coupled to the discharge port side and having a corrugated pipe at a predetermined position in the longitudinal direction.

The impeller of the case rotates at a high speed and sucks water and air together through the suction port and then mixes with each other. The motor pump crushes the air finely, compresses the compressed air, and pushes the compressed air to the discharge port. In order to accomplish the object of the present invention, the pump has a function of compressing the fluid to a high pressure and a cavitation phenomenon even when the air is introduced into the pump, because the idling of the pump due to so-called cavitation occurs easily when air flows into the case. It is desirable to apply a friction pump or multi-stage turbine pump, which is a rotor pump having a performance that does not readily occur.

The air supply unit serves as a conduit for supplying air into the motor pump through the water inlet. The air supply unit may be made of a hard tube made of metal or plastic. The air supply unit is preferably provided with a means for regulating the flow rate of the passing air such as a needle valve. Instead of using a valve, a structure for partially reducing the sectional area of the air duct may be used instead have. It is preferable that an air flow meter is additionally provided on the air supply pipe for more accurate operation of the apparatus so that the flow rate of the sucked air is measured and reflected in the operation. In addition, an air pressurizing means such as a compressor may be provided on the inlet side of the air supply unit so as to smoothly supply the air even under the condition of increasing the internal pressure of the tube. In some cases, a discharge port of a so-called orifice structure may be formed at the end of the air supply unit It is possible.

The water inflow part may be made of a pressure-resistant pipe which is resistant to a predetermined pressure higher or lower than the atmospheric pressure, and is a path of air supplied through raw water for producing bubble water and air supplied through the air supply part. The water inflow front end of the water inflow portion is provided with a flow rate control means such as a valve flow rate regulating means for forming a negative pressure at the suction port of the motor pump to smooth the inflow of air through the air supply portion In the case where a negative pressure is spontaneously generated according to the state of the channel through which water flows, the flow rate control means may be omitted. By additionally providing a flow meter or a pressure gauge on the water inflow conduit, it is possible to assist in the quantitative operation of the apparatus.

The air-dissolving unit includes a corrugated pipe. By continuously applying a shearing force to a mixed fluid of water and air flowing through the discharge port of the motor pump and maintaining a high-pressure state, a maximum amount of air in a given time Dissolves in water, and serves to split the surplus air into fine particles and discharge it to the outside of the apparatus. The corrugated tube is a pressure tube having a predetermined length provided with a concave portion and a convex portion continuously laminated on the inner circumferential surface. In the corrugated tube, a mixed fluid of water and air is disturbed during flow, so that bubble breakage and water dissolution occur. FIG. 4 is a schematic view for explaining the state of the fluid flowing into the corrugated pipe. When the fluid passes through the corrugated pipe, turbulence is generated by the corrugated irregularities inside the corrugated pipe wall, So that the particle size becomes smaller and the surface area increases, resulting in a higher dissolution rate. On the other hand, according to the schematic diagram for explaining the state of the fluid flowing into the linear tube of FIG. 5, the fluid is generally in the steady flow in the straight pipe, which is more disadvantageous than the corrugated tube in making the diameter of the bubble small. Therefore, it can be seen that the effect of dissolving air in the water is much greater when using the corrugated tube. The corrugated pipe can be selected and used in accordance with the discharge port of the motor pump according to the Korean Industrial Standard KS D 3628, for example, a pipe having a ring shape or a spiral shape. It can be applied easily and easily. The corrugated tube is structurally superior to the straight tube so that it can be manufactured and used with a thinner thickness, so that the material can be saved. Also, the corrugated tube can be easily bent into a coil type or " There is also an advantage of reducing installation space. Here, as the length of the corrugated pipe is relatively long, it is advantageous to increase the degree of saturation of the dissolved air, but it suffers from a practical problem, so it is reasonable to apply it in the range of 0.5 to 50 m. Further, if the tube internal pressure adjusting means using valves such as a ball valve or a gate valve is further provided at the end of the bellows pipe, the concentration of the air dissolved in the microfluidic device can be arbitrarily adjusted. Instead of applying a valve flow for simple fabrication and use, it is only necessary to form a structure that partially reduces the cross-sectional area of the flow end of the flow path, thereby making it possible to maintain the pressure applied to the fluid mixture in the corrugated pipe at a predetermined level Or omitting them at all, and using only the pressure that is spontaneously formed inside the bellows by the operation of the motor pump. Further, if a discharging portion pressure gauge is additionally provided between the outlet portion of the bellows pipe and the pipe internal pressure adjusting means, the operation of the apparatus can be facilitated.

Another object of the present invention is to provide a motor pump having an intake port and a discharge port, a water inflow part coupled to the suction port side, an air dissolving part connected to the discharge port side and having a corrugated pipe at a predetermined position in the longitudinal direction, And an air supply unit provided so as to communicate as a branch between the bellows and the bellows tube.

Bubble generator may be provided in which the air supply unit is communicated with the motor pump discharge port and the corrugated pipe instead of communicating the air supply unit in the longitudinal direction of the water inflow pipe. In this case, since the inflow air does not pass through the motor pump, There is a disadvantage in that a mixing effect of water and air due to stirring of the impeller of the pump can not be obtained, but cavitation is not generated in the motor pump, so that a large amount of air can be supplied into the corrugated tube, There is an advantage that a fine particle catcher including air can be obtained. Of course, in order to inject air into the relatively high-pressure corrugated pipe, the end portion of the air supply portion should be connected to the orifice-type nozzle or the air must be forcibly supplied. In order to compensate for the lowered mixing effect, Should be relatively long.

The water, air, and mixed fluid, which have undergone the process as described above, form a fine particle catcher when air is dissolved under the atmospheric pressure together with the finely dispersed air particles as bubbles.

According to the apparatus for producing micro-bubbles according to an embodiment of the present invention, the mixed fluid of water and air pressurized into the pressure-resistant corrugated tube is allowed to flow at a high speed, thereby maximizing the effect of dissolving the air, Thus, the manufacturing cost is low, and it is easy to use with a relatively simple structure.

In addition, there is an effect that stably and quantitatively minute bubbles can be generated.

In addition, the fluid resistance is minimized, and the effect of generating a large amount of fine grains is obtained with less power.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a configuration of an apparatus for generating fine bubbles according to a first embodiment of the present invention; FIG.
2 is a schematic diagram showing a configuration of an apparatus for generating fine bubbles according to a second embodiment of the present invention.
3 is a schematic view showing a configuration of an apparatus for generating fine bubbles according to a third embodiment of the present invention;
4 is a schematic view showing the state of a fluid flowing inside the corrugated pipe of the present invention.
5 is a schematic view showing a state of a fluid flowing inside a straight tube which is not according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing the configuration of a micro-bubble producing device according to a first embodiment of the present invention, Fig. 2 is a schematic view showing the configuration of a micro- bubble producing device according to a second embodiment of the present invention, Fig. 4 is a schematic view showing the state of a fluid flowing inside the corrugated tube of the present invention, Fig. 5 is a schematic view showing the inside of a straight tube which is not according to the embodiment of the present invention It is a schematic diagram showing the state of flowing fluid.

First Embodiment

1 is a schematic diagram showing a configuration of an apparatus 100 for producing micro-bubbles according to a first embodiment of the present invention.

1, the apparatus 100 for producing micro-bubbles according to the first embodiment of the present invention includes a motor pump 120 and an air supply unit 130 connected to the suction port 122 side of the motor pump 120 And an air dissolving unit 140 having a water inlet 110 and a bell 142 connected to a discharge port 124 of the motor pump 120.

Even when a predetermined amount of gas flows into the inside of the pump together with the fluid, the motor pump 120 can easily cause cavitation (a phenomenon in which the gas is filled in the pump for liquid, idling the rotor, Friction pump or multistage turbine pump, which is a non-rotating rotor motor pump, is used.

The motor pump 120 rotates at a high speed and sucks water and air supplied from the water inflow section 110 and the air supply section 130, which will be described later, and mixes them with each other. The air is finely crushed and compressed, And discharged to the dissection 140.

The water inflow part 110 is provided with a pressure-resistant pipe withstanding a pressure of 1 MPa to withstand a predetermined pressure higher or lower than atmospheric pressure.

The air supply part 130 is installed to communicate with a predetermined position in the longitudinal direction of the water inflow part 110.

The air flow control valve 132 is provided at a predetermined position of the air supply unit 130. The air flow control valve 132 is a means for controlling the flow of a proper amount of air into the water inlet 110, A valve, a gate valve, or the like. It is also possible to reduce the cross-sectional area of a part of the air supply line to control the flow rate.

The air supply part 130 is provided with an orifice type nozzle 134 at its end and is coupled to the fluid inflow part 110. This is because the air supply part 130 is connected to the suction part of the coupled pump When the positive pressure is applied to the fluid inlet 110, the air introduced from the air supply unit 130 is easily drawn into the fluid inlet 110.

The air supply unit 130 may further include an air pressure means 117 such as a compressor at a predetermined position so that air passing through the air supply unit 130 may be more easily introduced into the water inflow unit 110.

The air dissolving unit 140 is coupled to the motor pump discharge port 124 and has a bell tube 142 at a predetermined position in the longitudinal direction and is coupled to a discharge water connection pipe 144 through which the fluid is ultimately discharged.

That is, the apparatus is configured such that the air and water drawn through the air supply unit 130 and the water inlet 110 are drawn into the air dissolving unit 140 while being mixed with each other via the motor pump 120.

4 to 5, the corrugated tube 142 is formed in a shape in which a concave portion 142a and a convex portion 142b are continuously laminated on an inner circumferential surface, and the concave portion 142a and the convex portion 142b form a motor Disturbance occurs when the mixed fluid drawn from the pump 120 flows, so that the bubbles are continuously pulverized and dissolved.

At this time, the number of the corrugated tube 142 ranges from 2 to 50 per 100 mm, the ratio of the convex portion 142b to the concave portion 142a is in the range of 105 to 300%, and the number of the convex portions 142b Most preferably, the ratio of the convex portion 142b to the concave portion 142a is 110 to 200%, and the number of the convex portion 142b ranges from 4 to 40 per 100 mm.

In addition, the corrugated pipe 142 may be formed of a coil of a corrugated or spiral shape. When the length of the corrugated pipe 142 is long, it may be wound in a coil form for the convenience of the user, bent in a " It can be applied in parallel by branching with more than one piping, and it can be changed into any structure and shape as long as it can disturb the fluid.

Here, if the length of the corrugated pipe 142 is relatively long, the degree of saturation of the dissolved air can be increased. However, as the practical problem, the length of the corrugated pipe 142 is most preferably in the range of 0.5 to 50 m.

A discharging portion pressure regulating valve 146 is further provided at the end of the corrugated tube 142 coupled to the motor pump 120 to maintain the pressure applied to the mixed fluid in the corrugated tube 142 at a predetermined level. As the pressure regulating valve 146, a flow rate regulating device such as a ball valve or a gate valve may be applied, and only a structure for partially reducing the flow cross-sectional area of the flow path may be formed to impinge on the fluid mixture in the corrugated pipe 142 It is possible to use only the pressure which is formed spontaneously inside the corrugated tube 142 by the operation of the motor pump 120, omitting them altogether.

Hereinafter, an operation method of the apparatus 100 for producing micro-bubbles according to the first embodiment of the present invention will be described.

First, the air flow control valve 132 is closed, the discharge port pressure control valve 146 is opened, and the channel of the water inflow section 110 is connected to the source of bubble water production water, and then the motor pump 120 is operated .

Here, in the case where the air flow rate control valve 132 is not provided and the air flow rate is controlled only by the cross-sectional area of the air channel, the flow rate adjustment operation is omitted.

Thereafter, while the fluid passing through the motor pump 120 is discharged to the discharge water connection pipe 144, the air flow regulating valve 132 is slowly opened to introduce air into the motor pump 120, Observe the state of the fluid at the point where it is released.

If the mixed fluid of air and water observed becomes cloudy, since microbubbles are generated, the operation is continued as it is. If the bubbles on the millie bubbles that float due to the lack of cloudiness or the formation of millibars are in a level The discharge portion pressure regulating valve 146 is locked little by little to find and fix the time point at which the gas particles on the millibubble in which the microbubbles on the white surface are generated and floated are reduced to a level not to be an issue.

If a large amount of floating gas particles on a millimeter bubble continuously occurs, the opening degree of the air flow regulating valve 132 is gradually decreased step by step and the opening degree of the discharging portion pressure regulating valve 146 is lowered, The opening of each of the air flow rate regulating valve 132 and the discharging portion pressure regulating valve 146 is fixed and the apparatus is continuously operated. When the apparatus is turned off and restarted, or when it is determined that the state of the bubble water is not appropriate, the openings of the air flow regulating valve 132 and the discharging portion pressure regulating valve 146 are readjusted to a desired level.

At this time, the amount of water flowing into the micro-bubble generating device 100 is not adjusted separately, but the flow rate of the motor pump 120, the resistance of the entire piping including the micro-bubble generating device 100, 146).

The apparatus 100 for producing micro-bubbles according to the first embodiment can simplify the structure and manufacture the apparatus at a relatively low cost. Therefore, the apparatus can be applied to a relatively inexpensive use place such as an aquarium tank or an aeration tank of a sewage treatment plant .

Second Embodiment

2 is a schematic diagram showing a configuration of an apparatus 100 for producing micro-bubbles according to a second embodiment of the present invention.

2, the apparatus 100 for producing micro-bubbles according to the second embodiment of the present invention includes a motor pump 120, a water inlet 110 connected to the suction port 122 of the motor pump 120, And an air dissolving unit 140 having an air supply unit 130 and a bell pipe 142 coupled to the discharge port 124 side of the motor pump 120. In comparison with the first embodiment, Except that the air supply part 130 is provided between the rear end of the motor pump discharge port 124 and the front end of the corrugated pipe 142 instead of the water inflow part 110.

Therefore, a description of the redundant apparatus and a description of the operation method are omitted.

Since the inflow air does not pass through the motor pump 120, the apparatus 100 for producing micro-bubbles according to the second embodiment can not obtain a mixing effect of water and air due to stirring of the impeller of the motor pump. There is no possibility of cavitation due to the air introduced into the motor pump 120. Therefore, it is possible to relatively increase the amount of air relatively to the corrugated pipe Since the air can be supplied into the air dissolving unit 140 containing the air, the micro-catcher including a large amount of air can be obtained. In this case, the distal end of the air supply unit 130 may be connected to the orifice-type nozzle 134 to inject air into the air dissolving unit 140 having a relatively high pressure, or an air pressure such as a compressor It is essential to pressurize the air by the means 117 forcibly and to set the length of the corrugated tube relatively long in order to compensate for the lowered mixing effect.

When supplying a large amount of air to the interior of the apparatus 100 for producing fine particles according to the second embodiment, the amount of supplied air is likely to exceed the saturation solubility for water, And finally discharged in a bubble state finely dispersed by the shear force due to turbulent flow in the corrugated tube 142.

Since the apparatus 100 for producing micro-bubbles according to the second embodiment can produce a large amount of micro-bubbles while manufacturing a device at a relatively low cost, it is possible to produce a large amount of oxygen in a large fish farm or aeration tank of a sewage treatment plant .

Third Embodiment

3 is a schematic diagram showing a configuration of an apparatus 100 for producing micro-bubbles according to a third embodiment of the present invention.

3, the apparatus 100 for generating micro-bubbles according to the third embodiment of the present invention includes a suction portion pressure regulating valve 112 at a predetermined position of the water inlet 110 as compared with the first embodiment And an air flow meter 136 and an influent flow meter 114 are provided on the inlet side of the air flow control valve 132 and the inlet flow control valve 112 on the air supply part 130 and the water inlet part 110, A suction pressure gauge 115 is additionally provided between the suction port 122 and the suction port 122 of the air inlet 130 on the water inflow part 110 and the discharge port pressure regulating valve 146 , The discharge portion pressure gauge 147 is further provided.

Therefore, description of overlapping portions will be omitted.

The suction portion flow rate control valve 112 maintains a negative pressure state in the air supply portion 130 communicated with the water inflow portion 110 and is further provided at a predetermined position on the water inflow conduit in front of the air supply portion 130 A ball valve or a gate valve may be used or the pressure of the connection part of the air supply part 130 may be maintained at a predetermined level by simply forming a structure for partially reducing the cross- It can also be used as a means to

It is preferable that the air supply unit 130 and the water inlet unit 110 are further provided with an air flow meter 136 and an inflow water flow meter 114 for measuring the amount of air and fluid introduced into the air supply unit 130 and the water inflow unit 110, respectively .

A suction portion pressure gauge 115 installed between the suction portion flow rate regulating valve 112 and the motor pump suction port 122 is necessary for constantly controlling the flow rate of the air introduced from the air supply portion 130.

The discharging portion pressure gauge 147 is provided between the bellows pipe 142 and the discharging portion pressure regulating valve 146 and is necessary for constantly controlling the pressure applied to the fluid mixture in the bellows pipe 142.

The suction portion pressure gauge 115 and the discharge portion pressure gauge 147 can be of an oil-filled pressure gauge or an electronic pressure gauge. The suction portion pressure gauge 115, the suction portion flow rate regulating valve 112, It is also possible to automatically adjust the pressure inside the air supply unit 130 or the air dissolving unit 140 by electrically connecting the sub-pressure regulating valves 146 with each other.

Hereinafter, an operation method of the apparatus 100 for generating fine bubbles according to the second embodiment of the present invention will be described.

First, the air flow regulating valve 132 is closed and the channel of the water inflow section 110 is connected to the source of bubble water producing water in a state where the suction section pressure regulating valve 112 and the discharge section pressure regulating valve 146 are opened The motor pump 120 is started.

Thereafter, the discharge part pressure regulating valve 146 is gradually locked in a state in which the fluid passed through the motor pump 120 is discharged to the discharge water connection pipe 144, thereby raising the pressure of the discharge part pressure gauge 147. [

At this time, a larger amount of air can be dissolved in the water as the indicated pressure of the discharge part pressure gauge 147 is kept higher, but it is possible to range from 0.02 to 2 MPa in consideration of the performance and safety of a typical motor pump 120 , Preferably in the range of 0.3 to 0.7 MPa.

Thereafter, when the pressure of the discharge portion pressure gauge 147 rises to a predetermined level, the suction portion flow rate regulating valve 112 is gradually locked to maintain the pressure of the suction portion pressure gauge 115 at a negative pressure.

In this case, if the sound pressure is adjusted within a range of -0.01 to -0.05 MPa, there is no problem in operation, but it is preferable to operate within a range of -0.02 to -0.03 MPa for stable operation of the apparatus.

Thereafter, when the indicated pressure of the suction portion pressure gauge 115 reaches a predetermined level, the air flow regulating valve 132 is opened little by little to suck air into the motor pump 120.

At this time, the amount of the introduced air is adjusted so as to be one predetermined amount within the range of 0.02 to 5.0 vol.% With respect to the inflow water indicated in the inflow water flow meter 114 by checking the flow rate appearing in the air flow meter 136.

Here, it is effective that the flow rate of the supply air is supplied as much as possible within the range in which cavitation does not occur in the motor pump 120.

At this time, the flow rate of the inflow water is preferably determined in accordance with the purpose of the microbubble throwing destination, and it is not necessary to reduce the flow rate in comparison with the discharge capacity of the motor pump 120 used. In other words, it is most preferable that the amount of the fine particle catcher to be taken into account in designing the capacity of the motor pump 120 so as not to forcibly reduce the inflow water flow rate.

When the supply of air into the motor pump 120 is started, the indicated pressure of the discharge part pressure gauge 147 and the suction part pressure gauge 115, which are adjusted in the above-described process, are usually lowered. In this case, The valve 146 and the suction portion flow rate regulating valve 112 are opened or closed little by little so that the indication values of the discharge portion and suction portion pressure gauges 147 and 115 are adjusted to a desired range and the air flow rate regulating valve 132 Adjust the amount of inhaled air to the desired level.

That is, the operations of mutually adjusting the discharging portion pressure regulating valve 146, the suction portion flow regulating valve 112 and the air flow regulating valve 132 are repeatedly carried out to regulate the discharging portion pressure gauge 147, the suction portion pressure gauge 115, And all the indicated values of the flowmeter 136 reach a predetermined value.

If a millimeter bubble is generated at a level that is problematic to use in the micro-catcher to be generated, the air flow regulating valve 132 is adjusted to reduce the amount of air to be sucked, and then the discharge portion pressure regulating valve 146 and the suction portion The flow regulating valve 112 is respectively readjusted so that the indicated values of the discharging portion manometer 147 and the suction portion manometer 115 and the air flow meter 136 reach the desired values.

If the operation values of various instruments coincide with predetermined operating conditions by the above operation, the apparatus is continuously operated in this state.

Since the apparatus 100 for producing micro-bubbles according to the third embodiment can supply stable and quantitatively fine bubbles, it can be applied to precise applications such as a pressurized floating apparatus.

Therefore, according to the apparatus for producing micro-bubbles according to the first to third embodiments of the present invention, the mixed fluid of water and air pressurized into the pressure-resistant corrugated tube is caused to flow at a high speed, It is possible to maximize the effect, and hence the manufacturing cost is low, and it is easy to use with a relatively simple structure.

In addition, there is an effect that stably and quantitatively minute bubbles can be generated.

In addition, the fluid resistance is minimized, and the effect of generating a large amount of fine grains is obtained with less power.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention It will be understood.

100: Micro-bubble generating device 110: Water inflow part
112: Suction part flow control valve 114: Inflow water flow meter
115: Suction side pressure gauge 117: Air pressure means
120: motor pump 122: motor pump inlet
124: motor pump outlet
130: air supply part 132: air flow control valve
134: Orifice type nozzle 136: Air flow meter
140: air-dissolving portion 142: corrugated tube
142a: concave portion 142b: convex portion
144: discharge water connection pipe 146: discharge part pressure regulating valve
147: Discharge part pressure gauge

Claims (9)

A motor pump having an inlet and an outlet;
A water inflow portion coupled to the suction port side and having an air supply portion provided in a predetermined longitudinal position to communicate as a branch; And
And an air dissolving unit coupled to the discharge port side and having a corrugated pipe at a predetermined position in the longitudinal direction.
A motor pump having an inlet and an outlet;
A water inlet coupled to the suction port;
An air dissolving unit connected to the discharge port side and having a corrugated pipe at a predetermined longitudinal position; And
And an air supply unit installed between the discharge port and the bellows pipe so as to communicate as a branch.
The method according to claim 1 or 2,
Wherein the pressure regulating means is further provided with a discharging portion pressure regulating valve at an end of the air dissolving portion.
The method according to claim 1 or 2,
Wherein the air supply part is provided with an orifice type nozzle at its distal end and is coupled to the water inflow part.
The method according to claim 1 or 2,
Wherein the air supply unit is further provided with air pressurizing means for allowing air to flow easily into the water inlet.
The method according to claim 1 or 2,
Wherein the water inflow portion and the air supply portion are further provided with flow rate control valves, respectively.
The method according to claim 1 or 2,
Wherein the water inflow part and the air supply part are further provided with an inflow water flow meter and an air flow meter, respectively.
The method according to claim 1 or 2,
Wherein a pressure measuring means is provided between the air supply portion coupling position on the water inlet portion and the suction port of the motor pump and between the bellows pipe and the pressure adjusting means on the end of the air dissolving portion.
The method according to claim 1 or 2,
And the length of the corrugated pipe is 0.5 to 50 m.

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