KR101813113B1 - Self-suction aerator capable of controlling the size of bubbles and a method for controlling the size of bubbles using the same - Google Patents

Abstract

Provided by the present invention are a self-sucking aerator capable of controlling the size of bubbles and a size controlling method of self-sucking bubbles using the same. For the above, the self-sucking aerator capable of controlling the size of bubbles includes: a venturi nozzle which has a liquid inflow unit positioned at one end, has a liquid discharge unit positioned at the other end, and has a self-sucking unit connected to a space where a negative pressure is formed; and a collision plate structure which is positioned in the liquid discharge unit of the venturi nozzle and includes a collision plate capable of controlling a distance separated from a position where a neck part of the venturi nozzle ends. The bubble size controlling method using the self-sucking aerator includes: a step of injecting liquid into the self-sucking aerator; a step of inducing gas to the inside of the self-sucking unit in a self-sucking way by a pressure difference; and a step of controlling the size of bubbles by controlling a separation distance of the collision plate in a collision plate structure. According to the present invention, there is no necessity of preparing a means for separate gas compression by sucking gas in a self-sucking way and generating bubbles. Also, the present invention has an advantage of being easily applied to various situations and sites by controlling the size of bubbles generated for various purposes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-priming type aerator capable of controlling the size of a bubble, and a method for controlling the size of a bubble using the self-priming type bubble.

The present invention relates to a self-priming aerator capable of controlling the size of a bubble and a method for controlling the size of a self-priming bubble using the same.

In general, all water requires sufficient dissolved oxygen as a condition to be cleaned. If dissolved oxygen is sufficient, various types of bacteria in the water will degrade pollutants in the water. Therefore, the demand of dissolved oxygen varies depending on the level of pollution degree in each of water, sewage, industrial wastewater, agricultural water, reservoir, lake, river, etc., and here, many kinds of technologies for supplying dissolved oxygen have been developed.

Conventionally, there are two methods of generating micro-bubbles for water treatment, which can be divided into a pressurizing method and a self-pumped (turning) method. In the case of the pressurizing method, the compressed gas is introduced into the liquid, which has the advantage that the size of the bubbles generated in the water is very small as compared with the self-assisted breathing method and the density of the bubbles is also high. However, . In the case of the self-assisted breathing method, there is a disadvantage that the bubble size generated in the water is relatively large compared to the pressurizing method. However, by using the pressure drop generated inside the venturi nozzle, for example, the air in the atmosphere is automatically sucked, There is an advantage not.

In recent years, in order to reduce the size of bubbles generated in the self-assisted bubble generator, a thin film of a porous material is installed in the air suction portion of the nozzle, and a lot of researches and patents have been disclosed for miniaturizing bubbles by changing the flow path inside the nozzle . If the size of the generated bubbles is made small, the contact surface area is increased, and the water treatment efficiency can be improved. In addition, when the size of the bubbles is reduced to micro or nano size, the bubbles are not affected by the buoyancy in the water It is possible to effectively decompose pollutants in water.

However, for example, in the case of a water treatment facility, if the bubble size is too small, the bubble may interfere with the precipitation of the water pollutant, and the water treatment efficiency may be lowered. Therefore, there is a need for a technique for adjusting the size of bubbles in water to an appropriate range according to the application field.

More specifically, Korean Patent Registration No. 10-1440535 discloses a self-sucking micro-bubble generating device, more specifically, a micro-bubble generating device that sucks air in the air to generate micro-bubbles in water. And a plurality of blades 114 protruding downward at a predetermined distance from the center of the bottom surface of the base 111 corresponding to the base 111, An impeller 110 through which a connecting hole 115 is formed at the center of an upper surface of the main body 113; A part of the lower part of the impeller 110 is inserted through the connection hole 115 of the impeller 110 and a coupling part 121 is formed on the outer surface of the central part so that the coupling part 121 is connected to the main body 113 of the impeller 110 And is fastened to the upper surface of the hole 115 and is fixedly coupled to the main body 113 of the impeller 110 through the coupling member 130. A coupling hole 123 is formed at the center of a certain area of the bottom, A plurality of ribs are connected to the side wall 122 at regular intervals in the circumferential direction from the outside and the through holes 111a formed in the center of the coupling holes 123 and the base 111 of the impeller 110 form fastening members 140 (120) for tightly fixing the main body (113) of the impeller (110) to the base (111); An air supply pipe (150) provided in a hollow pipe type having a predetermined length, the lower end of which is connected to the upper end of the connection port (120); The air supply pipe 150 is rotated in accordance with the rotation of the shaft 161 protruding by a predetermined length so as to be rotatable on the bottom surface of the air supply pipe 150 and the connection port 120 A motor 160 rotatably supporting the impeller 110 connected to the lower end of the impeller 110 and having a fixing flange 163 protruding from the lower side; And the upper end of the air supply pipe 150 is connected and fixed to the shaft 161 of the motor 160 and the lower end of the air supply pipe 150 is connected and fixed to the upper end of the air supply pipe 150, And a coupling 170 through which an air suction hole 171 for selectively sucking air in the atmosphere is formed through the lower end of the coupling 170 at regular intervals along the circumference of the air suction hole 171, The air sucked from the air suction hole 171 and introduced between the inside of the air supply pipe 150 and the rib 125 of the connecting hole 120 is absorbed by the centrifugal force generated by the rotational force of the impeller 110 The air discharged through the wings 114 of the impeller 110 may be finely crushed and supplied into the water in the form of fine bubbles when the impeller 110 is pushed into the water by the action of the impeller 110. [ ) I The wing is protruding downward to form 114 discloses a priming micro-bubble generator party featuring formed larger toward the inside from the outside of the main body 113 is inclined such that the area is small. According to the invention of the above document, the impeller is disposed in the water through the connecting port at the lower end of the air supply pipe, the fine bubbles can be formed by using the centrifugal force of the shaft. However, There is no problem.

Korean Patent No. 10-1647107 discloses a device for controlling the size and the number of bubbles and a method of controlling the bubbles. More specifically, a gas A mixing portion 100; A bubble atomizing unit 200 coupled to a lower end of the gas mixing unit 100 and having a plurality of first protrusions 210 colliding with the bubble mixture 3 introduced from the gas mixing unit 100, ; And an expansion part (300) formed at the lower end of the bubble atomization part (200) for dispersing and discharging the bubble mixture (3); Wherein the gas mixing unit 100 includes a liquid inlet 110 for controlling a flow rate and a flow rate of the introduced liquid 1 and a gas inlet 110 for controlling a flow rate and a flow rate of the introduced gas 2. [ And an acceleration part 101 is formed on a lower side connected to the bubble atomization part 200. The acceleration part 101 has a tapered shape in which the inner flow path becomes narrower from the upper side to the lower side The gas inlet 120 supplies the gas 2 to the liquid 1 introduced into the gas mixing unit 100 and a diaphragm for controlling the size and number of the effective holes through which the gas can enter and exit The ultrasonic generator 230 includes a first injection nozzle 121 and emits ultrasonic waves toward the bubble mixture 3 flowing through the bubble atomization part 200 to the first protrusion 210 A bubble size and a number of bubbles. According to the invention of the above document, the size of the generated bubbles can be finely or coarsely controlled, but there is a problem that a separate additional structure is required to control the flow rate of the liquid and the gas, respectively.

Finally, Korean Patent No. 10-1126320 discloses a multipurpose nano bubble water generating device using a porous sintered product venturi tube having a nano pore structure. Specifically, a method of forming a venturi tube with a porous metal sintered body, Is generated. However, the invention of the above document has a problem that the size of bubbles generated according to required environmental conditions can not be controlled.

Accordingly, the inventors of the present invention have studied a self-priming aeration device capable of controlling the size of bubbles in a self-priming aeration device using a venturi nozzle so as to meet the requirements of a situation to be used.

It is an object of the present invention to provide a self-priming type aerator capable of controlling the size of a bubble and a method of controlling the size of a self-priming bubble using the same.

The venturi nozzle includes a liquid inlet portion at one end, a liquid discharge portion at the other end, and a self-discharge portion communicating with a space in which a negative pressure is formed. And an impingement plate which is located at a liquid discharge portion side of the venturi nozzle and is capable of adjusting a distance between a position where the neck portion of the venturi nozzle ends and a collision plate structure capable of adjusting a distance between the venturi nozzle and the venturi nozzle. Lt; / RTI > According to another aspect of the present invention, Introducing a gas into the self-priming unit by self-priming by a pressure difference; And adjusting the size of the bubbles by adjusting the distance of the impingement plate of the impingement plate structure. The present invention also provides a method of controlling the size of bubbles using the self-priming aerator.

According to the present invention, since bubbles are generated by sucking the gas in a self-propelled manner, it is not necessary to provide means for separate gas compression, and the size of bubbles generated according to the intended use can be adjusted, There is an advantage that it can be easily applied according to the situation and the field.

1 is a view showing a self-priming type aeration unit according to the present invention,
FIG. 2 is a view showing a venturi nozzle of the self-priming aerator according to the present invention,
3A to 3D are views showing a structure of a collision plate among the self-priming aerator according to the present invention,
4 is a graph showing the amount of intake air per liquid circulation flow rate according to the separation distance,
5 is a graph showing the mass transfer coefficient according to the intake air amount according to the separation distance, and FIG.
FIG. 6 is a graph showing the pressure due to resistance and the pressure drop in the venturi nozzle in the opposite direction of the water by the impingement plate according to the separation distance.

The present invention relates to a self-priming aerator capable of controlling the size of bubbles and a method for controlling the size of bubbles using the self-priming aerator.

The "neck portion of the venturi nozzle" in the description of the present invention means a portion where the cross sectional area of the liquid flowing in the venturi nozzle is narrower than the cross sectional area of the liquid inflow portion and the liquid discharge portion, and the negative pressure is formed.

The 'separation distance' in the description of the present invention means the distance from the end of the neck of the venturi nozzle to the collision plate.

In the following description, a detailed description of the theoretical matters related to the venturi nozzle, the theoretical matters concerning the correlation between the oxygen supply and the water quality improvement, and the like obvious to those skilled in the art may be omitted.

Hereinafter, the present invention will be described in detail.

A venturi nozzle having a liquid inflow section at one end and a liquid discharge section at the other end, the venturi nozzle communicating with a space in which a negative pressure is formed; And an impingement plate which is located at a liquid discharge portion side of the venturi nozzle and is capable of adjusting a distance between a position where the neck portion of the venturi nozzle ends and a collision plate structure capable of adjusting a distance between the venturi nozzle and the venturi nozzle. Lt; / RTI >

Hereinafter, the self-priming type aerator capable of controlling the bubble size according to the present invention will be described in detail with reference to FIGS. 1 to 3 (A) to 3 (D).

The self-priming aerator according to the present invention includes a venturi nozzle (10). The venturi nozzle generates negative pressure as the flow rate increases in a region where the cross-sectional area through which the liquid flows becomes narrow. The present invention includes the sucking portion 101 communicating with the space in which the negative pressure is formed, To the liquid flowing in the venturi nozzle. The venturi nozzle of the present invention as described above includes a liquid inflow portion 103 into which liquid is introduced at one end and a liquid ejection portion 104 through which liquid is ejected together with air bubbles at the other end. A negative pressure is formed in a specific space in the venturi nozzle in the course of the liquid being introduced into the inflow part of the venturi nozzle according to the present invention and then discharged to the liquid discharge part and the gas is introduced into the liquid through the self-

The self-priming aerator according to the invention comprises an impingement plate structure (20). The impingement plate structure 20 includes an impingement plate 202 which is located on the liquid discharge portion 104 side of the venturi nozzle 10 and is capable of adjusting the separation distance from the position where the neck portion of the venturi nozzle ends. The collision plate structure of the self-priming aerator according to the present invention can control the size of the bubble after collision with the collision plate by adjusting the distance between the end of the neck portion of the venturi nozzle and the collision plate. More specifically, when the separation distance is long, the probability that the bubbles formed by the gas introduced through the self-evacuation unit collides with the impact plate is reduced, so that most of the bubbles maintain the size of the preformed bubbles, When the distance is shortened, the probability that the bubbles formed by the gas introduced through the self-exhauster part collides with the impact plate increases, so that the number of bubbles becomes smaller than that of the preformed bubbles.

The self-priming aerator according to the present invention can adjust the size of the bubbles as described above, and the size thereof can be easily achieved simply by adjusting the distance between the end of the neck of the venturi nozzle and the distance between the impact plate , And can be easily applied to various fields. Specifically, in an application field in which water is desired to be released in water or in which it is necessary to induce a material reaction, the distance is shortened to make the size of the bubble small, thereby increasing the mass transfer rate, On the other hand, when mixing is induced through the formation of turbulence, or when it is used for membrane washing, etc., the above-mentioned object can be achieved by increasing the separation distance to increase the size of the bubbles and increasing the shear force of the bubbles. In addition, even when the water is abandoned to improve the water quality, when the flocculation of the pollutants in the water is required at the subsequent stage, the size of the air bubbles is controlled so as not to be too small to prevent the contamination from being precipitated. The self-priming aerator of the present invention has an advantage that it can be applied in a very easy manner to an application field requiring different physical characteristics as described above.

The impact plate structure of the self-priming type aerator according to the present invention comprises: an impact plate in which air bubbles collide; A variable shaft which is fixed to the impingement plate and adjusts the distance of the impingement plate; A fixed shaft to which the variable shaft is movably connected; An engaging portion to which the fixed shaft is engaged and engage the impact plate structure with the venturi nozzle; And a fixing pin for fixing the variable shaft to the fixed shaft.

Hereinafter, each configuration of the impingement plate structure of the present invention will be described in detail with reference to FIGS. 3A to 3D of the present invention.

The impingement plate structure according to the present invention includes an impingement plate 202 in which bubbles formed by the gas introduced through the respiration portion move with the liquid and then collide with each other. The impingement plate collides with the air bubbles, thereby reducing the size of the air bubbles. At this time, the shape of the impingement plate according to the present invention may be one type selected from the group consisting of spherical shape, disk shape, propeller shape, and mesh (net) shape, but as long as the above objects can be achieved, But it should not be limited to. On the other hand, the shape of the impingement plate can be selected according to various requirements such as the application field in which the self-priming aerators are used, the flow rate, the required bubble size, and the like.

The collision plate structure according to the present invention includes a variable shaft 203 fixed to the collision plate and adjusting the separation distance of the collision plate. The variable shaft 203 serves to adjust the separation distance between the impingement plate and the end of the neck of the venturi nozzle by displacing the impingement plate 202 in a direction parallel to the direction in which the liquid flows, for example. At this time, the direction of displacement of the impingement plate is not necessarily parallel to the direction in which the liquid flows.

The impact plate structure according to the present invention includes a fixed shaft 204 to which the variable shaft is movably connected. The impingement plate 202 and the variable shaft 203 fixed to the impingement plate 202 are displaceable while the impingement plate 202 and the variable shaft 203 fixed to the impingement plate are displaceable, , The variable shaft 203 is movably connected to the fixed shaft 204. In order to prevent the variable shaft 203 from being detached from the fixed shaft 204, The method in which the variable shaft is connected to the fixed shaft is not limited in any way as long as the variable shaft is movable and the variable shaft and the impact plate fixed thereto can be prevented from being detached from the impact plate structure.

The impingement plate structure 20 according to the present invention includes a coupling portion 201 to which the fixed shaft 204 is coupled and which couples the impingement plate structure 20 to the venturi nozzle 10. [ The engaging portion 201 is engaged with the impingement plate 202, the variable shaft 203, the fixed shaft 203, and the fixed shaft 204 to which the impingement plate 202 is fixed, The function of preventing the shaft 204 from being detached from the impingement plate structure 20 and on the other hand the impingement plate structure 20 including the above all constitution is combined with the liquid discharge portion 104 side of the venturi nozzle . The method of attaching the impact plate structure 20 to the liquid discharge portion 104 side of the venturi nozzle may be such that the impact plate structure 2 can be fixed to the liquid discharge portion 104 side of the venturi nozzle, But need not be limited to the method, and may be screwed, for example.

The impact plate structure 20 according to the present invention includes a fixing pin 205 for fixing the variable shaft 203 to the fixed shaft 204. [ The fixing pin according to the present invention fixes the variable shaft so that the variable shaft is not displaced in order to maintain the separation distance when the separation distance is determined according to the field in which the self-priming aerator of the present invention is used. In the course of the liquid flowing through the venturi nozzle, pressure is applied to the impingement plate, so that the variable shaft is moved and the spacing distance may be different from a predetermined value. In the fixing pin 205 according to the present invention, So that the separation distance is prevented from varying even under the flow of liquid, so that bubbles of a desired size can be continuously formed.

Preferably, the submerged aerator according to the present invention further comprises a pump (not shown) for forcing the inflow of the liquid to the liquid inflow portion 103 side of the venturi nozzle. When the flow rate of the liquid flowing into the venturi nozzle by the pump is adjusted, the pressure of the space in which the negative pressure is formed is regulated, whereby the amount of bubbles can be controlled and the kinetic energy applied to the bubbles is regulated , The size of the bubble after collision with the impact plate can also be adjusted.

It is preferable that the distance between the collision plate and the end position of the neck of the venturi nozzle according to the present invention is adjusted and controlled such that the distance between the end of the collision plate and the inner surface of the venturi nozzle ranges from 0.5 mm to 15 mm. When the distance is less than 0.5 mm, the amount of gas to be sucked is reduced and the amount of bubbles formed is decreased. When the distance is more than 15 mm, the size of the bubbles is not different from the size of the bubbles formed. So that it is not necessary to separately provide an impingement plate structure.

In the self-priming aerators according to the present invention, it is preferable that the ratio of the diameter of the neck of the nozzle to the diameter of the self-excitation part is 5: 1 or less. When the diameter of the neck of the nozzle is larger than this, there is a problem that the amount of air sucked in is considerably reduced and the amount of air bubbles is remarkably reduced.

The self-priming adsorber according to the present invention preferably includes a liquid flow rate gauge and a pressure gauge. By including the liquid flow rate gauge and the pressure gauge in this manner, it becomes possible to carry out the automatic operation through the numerical values obtained therefrom.

According to another aspect of the present invention, Introducing a gas into the self-priming unit by self-priming by a pressure difference; And adjusting the size of the bubbles by adjusting the distance of the impingement plate of the impingement plate structure. The present invention also provides a method of controlling the size of bubbles using the self-priming aerator.

Hereinafter, the method of controlling the size of bubbles according to the present invention will be described in detail.

The first step of the control method of the present invention is a step of injecting a liquid into the submerged aeration apparatus according to the present invention and injecting a liquid into the liquid inflow section of the submerged aeration apparatus according to the present invention including the venturi nozzle, Thereby allowing gas to be introduced through the self-extinguishing unit, and bubbles can be formed by introducing gas into the liquid to be injected. In this case, the amount of bubbles formed by controlling the flow rate of the liquid to be injected into the self-priming aeration unit can be controlled, and the flow rate of the liquid to be injected can be controlled using, for example, a pump connected to the liquid inflow portion side of the venturi nozzle .

Next, the second step of the adjusting method of the present invention is to adjust the size of the bubbles by adjusting the separation distance of the impingement plate among the impingement plate structures. Specifically, in the impingement plate structure included in the self- Adjusting the distance between the collision plate and the end of the neck of the venturi nozzle by adjusting the variable axis fixed to the collision plate, and controlling the degree of collision of the formed bubble with the collision plate, the size of the bubble is adjusted.

At this time, the bubble size can be adjusted to be small by making the spacing distance shorter and the preformed bubbles collide with the impingement plate a lot, and on the contrary, since the preformed bubbles collide less with the impingement plate, Can be adjusted to be equal to or similar to the size of the preformed bubbles.

The method of controlling the size of the bubbles using the self-priming aerator according to the present invention can control the size of the bubbles by an easy method according to the requirements of the application field, The stirring of the mixed liquid, and the washing of the membrane.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples and comparative examples are intended to illustrate the present invention more specifically, and are not intended to limit the scope of the present invention.

The specifications of the venturi nozzle and the impingement plate used in the following examples and comparative examples are as follows.

Venturi Specifications Liquid inlet diameter: 19 mm
Nozzle neck diameter: 3 mm Collision plate form circle Collision plate diameter 12.5 mm

≪ Example 1 >

Measurement of intake air amount according to circulation flow of water 1

Water was introduced into the submerged aeration unit according to the present invention while controlling the circulation flow rate of water from about 6 L / min to about 13 L / min, and the amount of intake air in each case was measured. The distance between the collision plate and the end of the neck of the venturi nozzle was 3.0 cm, and the distance between the end of the collision plate and the inner surface of the venturi nozzle was 0.58 mm.

≪ Example 2 >

Measurement of intake air amount according to circulation flow of water 2

Water was introduced into the submerged aeration unit according to the present invention while controlling the circulation flow rate of water from about 6 L / min to about 13 L / min, and the amount of intake air in each case was measured. The distance between the collision plate and the end of the neck of the venturi nozzle was 3.5 cm, and the distance between the end of the collision plate and the inner surface of the venturi nozzle was 1.47 mm.

≪ Example 3 >

Measurement of intake air amount according to circulation flow of water 3

Water was introduced into the submerged aeration unit according to the present invention while controlling the circulation flow rate of water from about 6 L / min to about 13 L / min, and the amount of intake air in each case was measured. The distance between the collision plate and the end of the neck of the venturi nozzle was 4.0 cm, and the distance between the end of the collision plate and the inner surface of the venturi nozzle was 2.36 mm.

<Example 4>

Measurement of the amount of intake air according to circulation flow of water 4

Water was introduced into the submerged aeration unit according to the present invention while controlling the circulation flow rate of water from about 6 L / min to about 13 L / min, and the amount of intake air in each case was measured. The distance between the collision plate and the end of the neck of the venturi nozzle was 4.5 cm, and the distance between the end of the collision plate and the inner surface of the venturi nozzle was 3.25 mm.

&Lt; Example 5 >

Measurement of intake air amount according to circulation flow of water 5

Water was introduced into the submerged aeration unit according to the present invention while controlling the circulation flow rate of water from about 6 L / min to about 13 L / min, and the amount of intake air in each case was measured. The distance between the collision plate and the end of the neck of the venturi nozzle was 5.0 cm, and the distance between the end of the collision plate and the inner surface of the venturi nozzle was 9.75 mm.

&Lt; Comparative Example 1 &

Measurement of intake air quantity according to circulation flow of water 6

Water is introduced into the venturi nozzle of the present invention (i.e., the apparatus not including the impingement plate structure) while adjusting the circulating flow rate of water in the range of about 6 L / min to about 13 L / min. In each case, Respectively.

<Experimental Example 1>

Collision plate Separation distance  And the amount of intake air according to the circulating flow rate

The results of Examples 1 to 5 and Comparative Example 1 are shown in Fig. 4, it can be seen that the intake air amount increases linearly as the circulation flow rate increases within the same impact plate separation distance.

On the other hand, according to the results of Comparative Example 1 and Examples 3 to 5, it can be seen that the embodiments of the present invention are substantially similar to Comparative Example 1 in which the amount of intake air according to the circulating flow rate does not include the impingement plate, . In addition, if the separation distance is too short, it can be confirmed that the amount of intake air becomes too low to prevent the occurrence of bubbles.

&Lt; Example 6 >

Measurement of mass transfer coefficient according to intake air amount 1

The mass transfer coefficient according to the amount of intake air obtained in Example 1 was measured and the method was as follows. Prior to the measurement of mass transfer coefficient, dissolved oxygen was reduced to 2 mg / L by supplying nitrogen gas to water to reduce dissolved oxygen in the water. Subsequently, changes in dissolved oxygen by bubbles generated in the submerged aeration tank were measured at intervals of 30 seconds until dissolved oxygen reached saturation using a dissolved oxygen measuring device. The mass transfer coefficients were estimated by the following equation (1) (Akita et al., 1973) based on measured dissolved oxygen data in water. Where K _L a means mass transfer coefficient, C _s and C mean saturated dissolved oxygen, respectively, and dissolved oxygen at specific time.

&Quot; (1) &quot;

&Lt; Example 7 >

Measurement of mass transfer coefficient according to intake air amount 2

The mass transfer coefficient according to the amount of intake air obtained in Example 2 was measured in the same manner as in Example 6. [

&Lt; Example 8 >

Measurement of mass transfer coefficient according to intake air amount 3

The mass transfer coefficient according to the amount of intake air obtained in Example 3 was measured in the same manner as in Example 6. [

&Lt; Example 9 >

Measurement of mass transfer coefficient according to intake air amount 4

The mass transfer coefficient according to the amount of intake air obtained in Example 4 was measured in the same manner as in Example 6. [

&Lt; Example 10 >

Measurement of mass transfer coefficient according to intake air amount 5

The mass transfer coefficient according to the amount of intake air obtained in Example 5 was measured in the same manner as in Example 6 above.

&Lt; Comparative Example 2 &

Measurement of mass transfer coefficient according to intake air quantity 6

The mass transfer coefficient according to the amount of intake air obtained in Comparative Example 1 was measured.

<Experimental Example 2>

Collision plate Separation distance  And mass transfer coefficient according to intake air amount

The results of Examples 6 to 10 and Comparative Example 2 are shown in Fig. According to FIG. 5, it can be seen that the mass transfer coefficient increases as the intake air amount increases within the same separation distance.

On the other hand, it can be seen that the mass transfer coefficient increases in the same intake air amount as the separation distance from the impingement plate becomes closer, which is interpreted as the size of the bubble decreases as the separation distance approaches. As a result, it can be seen that the self-priming type aerator of the present invention can control the size of the bubbles by adjusting the position of the impingement plate.

<Experimental Example 3>

The circulation flow rate of the water is adjusted to 10 L / min, the separation distance of the impingement plate is adjusted by using the self-priming aerator according to the present invention, the pressure due to the reverse flow and resistance of the water by the impingement plate and the pressure drop in the venturi nozzle And the results are shown in FIG.

According to FIG. 6, it can be seen that the separation distance of the impingement plate becomes close to that the pressure due to the flow in the opposite direction of the water and the resistance increases, thereby reducing the pressure drop in the nozzle. Thus, it can be seen that when the separation distance of the impingement plate approaches, more pressure drop and a circulating flow of water are required.

1: Self-priming aerator
10: Venturi nozzle
20: Collision plate structure
101:
102: Space where negative pressure is formed
103: liquid inlet
104: liquid discharge portion
201:
202: collision plate
203: variable axis
204: fixed shaft
205: Fixing pin

Claims (11)

A venturi nozzle having a liquid inlet portion at one end and a liquid discharge portion at the other end, and a self-venting portion communicating with a space in which a negative pressure is formed; And
And a collision plate structure disposed on the liquid discharge portion side of the venturi nozzle and capable of adjusting a distance between the venturi nozzle and a position where the neck portion of the venturi nozzle ends, thereby controlling the size of the generated bubbles, Lt; / RTI &gt;
The impingement plate structure
A collision plate in the form of a disk or a propeller type in which air bubbles collide;
A variable shaft which is fixed to the impingement plate and adjusts the distance of the impingement plate;
A fixed shaft to which the variable shaft is movably connected;
An engaging portion to which the fixed shaft is engaged and engage the impact plate structure with the venturi nozzle; And
And a fixing pin for fixing the variable shaft to the fixed shaft. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
delete delete The self-priming aerator according to claim 1, wherein the venturi nozzle further comprises a pump for forcing liquid to flow into the liquid inflow portion.
The venturi nozzle according to claim 1, wherein the distance between the impact plate and the end of the neck of the venturi nozzle is adjusted so that the distance between the end of the impact plate and the inner surface of the venturi nozzle ranges from 0.5 mm to 15 mm Self-priming aerator with adjustable bubble size.
The self-priming aerator according to claim 1, wherein the neck diameter of the nozzle and the diameter ratio of the self-priming part are 5: 1 or less.
The self-priming aerator according to claim 1, wherein the self-priming aerator capable of controlling the bubble size includes a liquid flow rate gauge and a pressure gauge.
Injecting a liquid into the self-priming aerator according to claim 1;
Introducing a gas into the self-priming unit by self-priming by a pressure difference; And
And controlling the size of the bubbles by adjusting the distance of the impingement plate of the impingement plate structure.
[9] The method of claim 8, wherein the adjusting method shortens the separation distance of the impingement plate to reduce the size of the bubbles.
[9] The method of claim 8, wherein the adjusting method increases the size of the bubbles by adjusting the separation distance of the impingement plate.
delete

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