KR102014138B1

KR102014138B1 - An electrostatic spray device

Info

Publication number: KR102014138B1
Application number: KR1020120070344A
Authority: KR
Inventors: 김우진; 최지은
Original assignee: 엘지전자 주식회사
Priority date: 2012-06-28
Filing date: 2012-06-28
Publication date: 2019-08-26
Also published as: KR20140003015A

Abstract

The electrostatic spraying device according to the present embodiment includes a fluid supplying device for supplying a working fluid, a voltage applying unit for applying a high voltage, and a nozzle part for discharging droplets formed from the working fluid. The main body provides a flow path of the working fluid; An inlet formed in the main body and into which a working fluid is introduced; An inner flow passage extending from the inflow portion toward the inside of the main body; An outer passage communicating with the inner passage and formed outside the main body; And an end portion forming one end of the main body, in which an electric field generated by the high voltage is applied to spray the droplets.

Description

Electrostatic spray device

The present invention relates to an electrostatic spraying device.

An electrospray device is a spray device that splits a liquid into small droplets by electric force. Such electrostatic spraying has the property of generating charged microdroplets having a monodisperse distribution in the cone-jet mode.

In detail, as shown in FIG. 1, the conventional electrostatic spraying device 1 includes a voltage applying unit 2 for applying a high voltage, a fluid supply device 3 for supplying a predetermined fluid to be sprayed, and the fluid. A nozzle unit 5 for spraying the formed droplets 6 (injection fluid) is included.

The electrostatic spray device 1 further includes a capillary tube 4 connecting the fluid supply device 3 and the nozzle unit 5. The capillary tube 4 and the voltage applying unit 2 are connected by an electric wire or the like.

The capillary tube 4 is made of a tube having an outer diameter of about 1 to 2 mm and a hollow so that the fluid supplied from the fluid supply device 3 can pass therethrough. In order for the fluid to have specific ions according to the voltage applied from the voltage applying unit 2, the capillary tube 4 may be made of a conductive material to which a voltage may be applied.

The nozzle portion 5 is provided below the capillary tube 4 and is configured to spray the droplets. The inner diameter of the nozzle unit 5 may have a value corresponding to the outer diameter of the capillary tube 4 so that the nozzle unit 5 and the capillary tube 4 can be easily coupled.

When the magnitude of the electric force acting on the nozzle unit 5 by a voltage applied from the voltage applying unit 2 is greater than or equal to a predetermined size, a cone cone of liquid is formed at the end of the nozzle unit 5. Is distributed, and fine droplets are ejected from the liquid.

According to the conventional electrostatic spraying device, since the conjet mode is optimized for low flow rate, the field to which the actual electrostatic spraying is applied is limited.

In order to overcome this problem of low flow rate, a technique for implementing a plurality of grooves in the nozzle portion and forming a plurality of conjets through the plurality of grooves has been proposed. However, according to this technique, since a fine groove must be processed in the tip portion of the nozzle portion, there is a difficulty in manufacturing or processing.

In addition, when processing the fine groove in which the atomized fluid flows in a state in which the nozzle portion 5 itself is small, the inner diameter of the groove is formed very narrow, there is a problem that clogging phenomenon of the nozzle portion 5 occurs there was.

In order to solve this problem, an embodiment of the present invention aims to propose an electrostatic spraying apparatus capable of performing a high flow rate electrostatic spraying without clogging the nozzle portion.

According to the proposed embodiment, the inner passage and the outer passage are formed in the nozzle portion to guide the flow of fluid, and the plurality of the outer passages are formed so that a plurality of droplets can be sprayed at the end of the nozzle portion. As a result, the flow rate of the fluid sprayed from the nozzle portion can be increased.

In addition, since the external flow path is formed on the outer peripheral surface (or outer surface) of the nozzle portion, the fluid can flow along the outer peripheral surface, there is an advantage that the flow path of the fluid can be secured large. That is, since a plurality of grooves are formed on the outer circumferential surface of the nozzle portion, the effect that the spray flow rate of the fluid is not influenced by the inner diameter of the nozzle portion.

In addition, there is an effect that the flow of the fluid is blocked, that is, the clogging of the nozzle portion can be prevented by the fluid flowing along the external flow path.

In addition, by providing the moisture absorbing member inside the nozzle, there is an effect that the fluid introduced into the nozzle portion through the inlet portion can be evenly distributed and discharged to a plurality of external passages.

In addition, since the guide portion of the inclined shape is provided inside the nozzle, there is an effect that the fluid can be evenly distributed to a plurality of external flow paths.

In addition, since a plurality of guide members having a bead shape is provided inside the nozzle, there is an effect that the fluid introduced into the nozzle can be evenly distributed to the plurality of external flow paths.

1 is a block diagram showing the configuration of a conventional electrostatic spraying device.
2 and 3 are perspective views showing the configuration of the nozzle unit according to the first embodiment of the present invention.
4 is a cross-sectional view taken along line II ′ of FIG. 2.
FIG. 5 is a cross-sectional view taken along line II-II 'of FIG. 2.
6 is a view showing a state that the fluid is sprayed in the nozzle unit according to the first embodiment of the present invention.
7 is a cross-sectional view showing an internal configuration of a nozzle unit according to a second embodiment of the present invention.
8 is a perspective view showing the configuration of a nozzle unit according to a third embodiment of the present invention.
FIG. 9 is a cross-sectional view taken along line III-III ′ of FIG. 8.
10 is a view showing a state that the fluid is sprayed in the nozzle unit according to the third embodiment of the present invention.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments within the scope of the same idea.

2 and 3 are perspective views showing the configuration of the nozzle unit according to the first embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line II ′ of FIG. 2, and FIG. 5 is a II-II ′ of FIG. 2. 6 is a cross-sectional view taken along the line, and FIG. 6 is a view showing a state in which the fluid is sprayed from the nozzle unit according to the first embodiment of the present invention.

2 to 5, the nozzle unit 100 according to the first embodiment of the present invention includes a main body 101 having a substantially tubular shape and providing a flow path of the working fluid, and the main body 101 of the main body 101. An inflow portion 105 formed at one end and into which a working fluid flows, an inner flow passage 106 extending in one direction from the inflow portion 105 to the inside of the nozzle portion 100, and the inner flow passage 106; An external flow path 120 extending in the one direction from the outer peripheral surface of the main body 101 is included.

The inlet portion 105 is understood as the part that is coupled to the capillary tube 4 described in FIG. 1. The working fluid is introduced into the main body 101 through the inlet 105.

The internal flow path 106 is formed in the inner surface of the main body 101 as a portion formed by being recessed from the inflow portion 105 into the main body 101. For example, the inner passage 105 may extend downward from the inlet portion 105. Since the inner passage 105 is a passage in the main body 101, the inner passage 105 may not be exposed to the outside of the nozzle unit 100.

The outer passage 120 communicates with the inner passage 106 and is formed on the outer surface of the main body 101 as a portion formed by recessing the outer circumferential surface of the main body 101 by a predetermined depth. For example, the outer passage 120 is provided at one side of the inner passage 105 and extends to the distal end 125 which is the other end of the main body 101.

The distal end 125 is an opposite end of the inlet 105, and may be understood as a part where atomized fluid particles (droplets) are sprayed when a high voltage is applied. For example, the inflow portion 105 may be an upper end of the nozzle unit 100, and the distal end 125 may be a lower end of the nozzle unit 100. In this case, the working fluid may flow into the nozzle unit 100 through the inlet 105 and flow in a direction in which gravity acts.

The outer passage 120 includes a recess 121 recessed from an outer circumferential surface of the main body 101 and a step 122 defining a boundary between both sides of the recess 121. The depression 121 is recessed to extend in the longitudinal direction of the main body 101, the step 122 is a portion which is not recessed can be understood as a portion protruding relatively to the depression 121. have.

In addition, the recess 121 and the step 122 may extend to the distal end 125.

As such, since the external flow path 120 is an external flow path outside the main body 101, the external flow path 120 may be exposed to the outside of the nozzle part 100, and may be formed on the outer circumferential surface of the main body 101. It may not be affected by the internal size (or internal diameter) of the. That is, the external flow path 120 provides a relatively large flow cross-sectional area when compared to the flow path formed inside the main body 101, and thus the amount of the working fluid flowing can be increased.

On the other hand, a plurality of the external flow path 120 is formed. In detail, the depression 121 and the stepped 122 may be provided in plural, and the plurality of depressions 121 and the stepped 122 may be alternately disposed.

In FIG. 2, four external flow paths 120 are illustrated as being spaced apart from each other along the longitudinal direction of the main body 101, but the idea of the present embodiment is not limited to a specific number of external flow paths 120. That is, two or more external passages 120 may be provided.

Between the inner passage 106 and the outer passage 120, a plurality of branch passages 108 are provided to guide the working fluid passing through the inner passage 106 to the plurality of outer passages 120. .

The branch passage 108 may extend laterally from one end (lower end in FIG. 4) of the internal passage 106. The branch flow path 108 is located at an approximately central portion with respect to the longitudinal direction of the main body 101. The number of branch passages 108 may correspond to the number of external passages 120.

At the end of the branch flow path 108, a discharge part 110 through which a working fluid is discharged from the inside of the main body 101 to the outside is formed. A plurality of discharge parts 110 are spaced apart from each other along the outer circumferential surface of the main body 101.

In addition, the discharge part 110 is understood as a starting point of the external flow path 120. That is, the working fluid flows inside the main body 101 through the internal flow path 106 and the branch flow path 108, and is discharged to the outside of the main body 101 through the discharge part 110.

Inside the main body 101, a hygroscopic member 130 is provided so that the working fluid flowing through the inner passage 106 can be evenly distributed to the plurality of branch passages (108). The moisture absorbing member 130 may be disposed above the plurality of branch passages 108. For example, as illustrated in FIGS. 2 and 5, when the plurality of branch passages 108 extend in four directions, the moisture absorbing member 130 crosswise in a cross direction corresponding to the shape of the branch passage 108. Can be arranged.

Depending on the direction in which the nozzle unit 100 extends, the working fluid passing through the internal passage 106 may be biased to one branch passage 108 among the plurality of branch passages 108 and may flow. In order to solve this problem, the moisture absorption member 130 that can hold the working fluid is provided inside the nozzle unit 100 according to the present embodiment. The working fluid may be absorbed by the moisture absorbing member 130, and then, if absorbed by a predetermined amount or more, may flow into the external flow path 120 through the discharge shaft unit 110 by a predetermined amount.

1, 4 and 6, the operation of the nozzle unit 100 according to the present embodiment will be described.

When a working fluid is supplied from the fluid supply device 3, the working fluid may flow to the nozzle part 5 through the capillary tube 4. In addition, when a high voltage is applied to the capillary tube 4 through the voltage applying unit 2, the working fluid exhibits a unipolar charge.

In detail, when a high voltage is applied through the voltage applying unit 2, the ion repulsion force acts in the fluid according to the polarity of the voltage, and thus the ions reacted with the repulsive force move to the nozzle unit 100.

For example, when a voltage having a positive electrode is applied in the voltage applying unit 2, negative ions dissolved in the fluid are implanted or moved to the inner wall surface of the capillary tube 4. The cations dissolved in the fluid move to the nozzle unit 100 by the repulsive force. On the contrary, when a voltage having a negative electrode is applied in the voltage applying unit 2, negative ions dissolved in the fluid move to the nozzle unit 100 by the repulsive force.

The working fluid flowing into the nozzle part 100 flows into one side of the main body 101, that is, through the inflow part 105, into the main body 101, and moves along the inner flow path 106. It flows below the main body 101.

The working fluid flowing through the internal passage 106 flows into the plurality of branch passages 108. At this time, when the working fluid is absorbed by the moisture absorbing member 130 and accumulated in a predetermined amount or more, it is distributed to the plurality of branch flow paths 108.

The working fluid flows from the plurality of branch passages 108 to the outer circumferential surface of the main body 101 via the discharge part 110. The working fluid flows toward the distal end 125 along the recess 121. A strong electric force acts on the working fluid approaching the distal end 125 to atomize the atomized droplets.

In detail, when the magnitude of the electric force acting on the nozzle unit 100 by the voltage applied from the voltage applying unit 2 is more than a predetermined size, the cone cone (Taylor cone) of the end of the nozzle unit (100) Liquid clusters can be distributed. Here, the predetermined size corresponds to the surface tension of the working fluid.

At this time, the tip of the depression 121, that is, the depression 121 formed in the distal end 125 acts as a peak (peak) of the electric field to form a relatively strong electric field, it can be sprayed stably have.

In addition, since the plurality of external flow paths 120 are formed on the outer circumferential surface of the main body 101, a multi-conjet mode may be implemented at the plurality of distal parts 125a and 125b. The plurality of distal portions 125a and 125b are formed at positions corresponding to the plurality of recesses 121.

The plurality of distal portions 125a and 125b include a first distal portion 125a and a second distal portion 125b which are different from each other among the distal portions 125. The first distal end 125a or the second distal end 125b is understood as a boundary point between the depression 121 and the stepped portion 122, that is, the portion where the stepped portion 122 protrudes.

In summary, a plurality of cones are formed through the plurality of distal portions 125a and 125b and droplets can be sprayed from the plurality of cones. As a result, the fluid can be sprayed at a plurality of points by flowing the fluid at the outer surface of the nozzle unit 100, not inside the nozzle unit 100 having a small inner diameter, it is possible to increase the spray amount of the fluid.

In FIG. 6, two end portions 125a and 125b are shown to be sprayed, but it will be readily understood that droplets may be sprayed at three or more end portions.

In addition, since the working fluid flowing inside the main body 101 may be discharged from the discharge part 110 and spread widely on the outer circumferential surface of the main body 101, the inner diameter of the nozzle part 100 may be small. Even if the flow of the working fluid is limited, that is, it is possible to solve the problem of less spray amount. In addition, clogging of the nozzle unit 100 may be prevented.

Hereinafter, a second embodiment of the present invention will be described. Since the present embodiment differs only in some configurations compared to the first embodiment, the differences are mainly described. For the same parts as the first embodiment, the description of the first embodiment and reference numerals are used.

7 is a cross-sectional view showing an internal configuration of a nozzle unit according to a second embodiment of the present invention.

Referring to FIG. 7, in the nozzle part 100 according to the second embodiment of the present invention, a guide for allowing a working fluid past the internal passage 106 to be easily flowed to the plurality of discharge parts 110. Part 144 is provided.

The guide part 144 is formed to be inclined laterally downward as a part forming one surface of the plurality of branch passages 108. The upper end of the guide part 144 is defined as a vertex part 142.

The working fluid flowing along the inner passage 106 is branched in a plurality of directions from the vertex portion 142 and flows toward the outer circumferential surface side of the main body 101 along the guide portion 144 inclined downward. Since the guide part 144 is formed to be inclined downward, the working fluid can be easily flowed from the vertex part 142 to the discharge part 110.

In other words, the discharge part 110 is disposed at a lower position than the vertex part 142, and a part connecting the vertex part 142 and the discharge part 110 may be understood as the guide part 144.

On the upper side of the guide portion 144, the moisture absorbing member 130 described in the first embodiment is provided. Therefore, the working fluid flowing along the inner passage 106 is absorbed by the moisture absorbing member 130 and then flows to the discharge part 110.

Since the guide part 144 is formed to be inclined laterally from the inner center of the main body 101, it can be understood that the branch flow path 108 is also formed to be inclined laterally.

8 is a perspective view showing the configuration of a nozzle unit according to a third embodiment of the present invention, FIG. 9 is a cross-sectional view taken along line III-III 'of FIG. 8, and FIG. 10 is a nozzle according to the third embodiment of the present invention. It is a figure which shows the fluid sprayed from a part.

8 and 9, the nozzle unit 200 according to the third embodiment of the present invention includes a main body 201 defining a predetermined internal space and a working fluid formed on one side of the main body 201. Inlet 205 into which the gas is introduced, a plurality of discharge parts 210 for discharging the working fluid from the inside of the main body 201, and an extension part 208 extending outwardly from the main body 201. .

The main body 201 may have a case shape of a substantially rectangular parallelepiped, and an internal flow passage 206 is defined therein, which provides a flow space of the working fluid introduced from the inflow portion 205.

The inlet part 205 may be disposed on an upper surface of the main body 201, and the plurality of discharge parts 210 may be disposed to be spaced apart from each other in parallel to a lower end of the main body 201. In addition, the plurality of discharge parts 210 may be disposed on one side and the other side of the main body 201.

The extension part 208 extends inclined outward from the lower end of the main body 201, and a plurality of extension parts 208 are provided on both sides of the main body 201. In addition, a plurality of external passages 220 are formed in the extension part 208 to guide the flow of the working fluid discharged from the discharge part 210.

The outer passage 220 includes a recess 221 formed by recessing at least a portion of the extension part 208 and a step 222 defining both sides of the recess 221. The step 222 is a portion which is not recessed and is understood as a protrusion protruding relatively to the recess 221.

The depression 221 and the step 222 extend downward from the discharge part 210 and extend to the distal end 225 of the extension part 208. The distal end portion 225 may be understood as an end portion of the extension portion 208 opposite to one end portion at which the discharge portion 210 is formed. In summary, the extension portion 208 includes one end portion at which the discharge portion 210 is formed and the other end portion at which the distal portion 225 is formed.

The extension portion 208 includes a plurality of depressions 221 and step 222. The plurality of recesses 221 and the step 222 are alternately arranged side by side. In addition, the plurality of recesses 221 are disposed to correspond to the lower side of the plurality of discharge parts 210. That is, the working fluid discharged from the one discharge part 210 flows downward through the one depression 221, and the working fluid discharged from the other discharge part 210 flows downward through the other depression 221. Can be.

The distal end 225 includes a plurality of distal ends 225a and 225b in which a cone-shaped liquid cluster is formed. The plurality of distal portions 225a and 225b are formed at positions corresponding to the plurality of recesses 221.

The plurality of distal ends 225a and 225b include a first distal end 225a and a second distal end 225b which are different from each other among the distal ends 225. The first distal end 225a or the second distal end 225b is understood as a boundary point between the depression 221 and the step 222, that is, the portion where the step 122 protrudes.

Meanwhile, a plurality of guide members 230 are provided inside the main body 201. The plurality of guide members 230 guide the working fluid introduced through the inlet 205 to be evenly distributed to the plurality of discharge parts 210.

The guide member 230 may have a bead shape. In addition, since the guide member 230 is provided in plural, the inner flow path 206 forms a portion outside the guide member 230. That is, the inner passage 206 may be understood as a void except for the plurality of guide members 230 in the inner space of the main body 201.

Referring to Fig. 10, the spraying operation according to the third embodiment will be briefly described.

When a high voltage is applied through the voltage applying unit 2, the ion repulsive force acts in the fluid according to the polarity of the voltage, and thus the ions reacted with the repulsive force move to the nozzle unit 200.

The working fluid flowing into the nozzle part 100 flows into the main body 201 through the inlet 205 of the main body 201, and discharges the discharge part 210 along the inner flow path 106. Flows toward. In this case, the working fluid may be evenly distributed to the plurality of discharge parts 210 through the space between the plurality of guide members 230.

The working fluid discharged to the outside of the main body 201 through the discharge part 210 flows to the distal end portion 225 through the plurality of external flow paths 220. A strong electric force acts on the working fluid approaching the distal end 225 to atomize the atomized droplets.

As described in the first embodiment, when the magnitude of the electric force acting on the nozzle unit 200 by the voltage applied from the voltage applying unit 2 is greater than the surface tension of the working fluid, the nozzle unit 200 At the end of the liquid cone of the Taylor cone (Taylor cone) can be distributed.

At this time, the tip of the depression 221, that is, the depression 221 formed in the distal end 225 acts as a peak (peak) of the electric field to form a relatively strong electric field, it can be sprayed stably have.

In addition, the multi-conjet mode may be implemented at the plurality of distal ends 225a and 225b. That is, a plurality of cones are formed through the plurality of distal ends 225a and 225b and droplets can be sprayed from the plurality of cones. As a result, the fluid may be sprayed at a plurality of points by flowing the fluid on the outer surface of the nozzle unit 200, not inside the nozzle unit 200 having a small inner diameter, it is possible to increase the spray amount of the fluid.

In FIG. 10, two end portions 225a and 225b are shown to be sprayed, but it will be readily understood that droplets may be sprayed at three or more end portions.

In addition, since the working fluid flowing inside the main body 201 may be discharged from the discharge part 210 and spread and spread widely on the outer circumferential surface of the main body 201, the inner diameter of the nozzle part 200 may be small. Even if the flow of the working fluid is limited, that is, it is possible to solve the problem of less spray amount. In addition, clogging of the nozzle unit 200 may be prevented.

100: nozzle 101: main body
105: inlet 106: internal flow path
108: branch flow path 110: discharge part
120: external passage 121: depression
122: step 125: distal end
130: moisture absorbing member 142: apex portion
144: guide portion 208: extension portion
230: guide member

Claims

In the electrostatic spraying device comprising a fluid supply device for supplying a working fluid, a voltage applying unit for applying a high voltage and a nozzle unit for ejecting the droplets formed from the working fluid,
In the nozzle unit,
A main body providing a flow path of the working fluid;
An inlet formed in the main body and into which a working fluid is introduced;
An inner flow passage extending from the inflow portion toward the inside of the main body;
An outer passage communicating with the inner passage, the outer passage being provided in plural to the outside of the main body; And
An end portion which forms one end of the main body and is sprayed with droplets by an electric field generated by the high voltage;
A branching flow path for branching the working fluid from the inner flow path to the plurality of external flow paths; And
Is formed on the outer circumferential surface of the main body, and includes a discharge portion for discharging a working fluid to the external flow path,
The branch flow path,
Electrostatic spraying device, characterized in that the moisture absorption member for absorbing the working fluid flowing along the inner passage is provided.

delete

The method of claim 1,
And said branch flow path extends laterally from the inside of said main body.

The method of claim 1,
The external flow path,
A depression formed by recessing at least a portion of an outer circumferential surface of the main body; And
Electrostatic spraying device comprising a step defining the both sides of the depression.

The method of claim 5,
A plurality of depressions and stepped electrostatic spray device, characterized in that arranged alternately with each other.

The method of claim 6,
The distal end includes a plurality of distal parts corresponding to the plurality of depressions,
Electrostatic spraying device, characterized in that the droplets are sprayed at each of the plurality of distal ends.

delete

The method of claim 1,
The branch flow path,
Electrostatic spraying device comprising a guide portion extending inclined downward toward the discharge portion from the internal flow path.

In the electrostatic spraying device comprising a fluid supply device for supplying a working fluid, a voltage applying unit for applying a high voltage and a nozzle unit for ejecting the droplets formed from the working fluid,
In the nozzle unit,
A main body providing a flow path of the working fluid;
An inlet formed in the main body and into which a working fluid is introduced;
An inner flow passage extending from the inflow portion toward the inside of the main body;
An outer passage communicating with the inner passage, the outer passage being provided in plural to the outside of the main body;
It forms one end of the main body, the electric field generated by the high voltage acts to include a distal end portion sprayed,
Inside the main body,
Includes a plurality of guide members for distributing the working fluid flowing through the inlet to the plurality of external flow paths,
The plurality of guide members are electrostatic spraying device having a bead shape.

The method of claim 10,
At the lower end of the main body, a plurality of discharge parts for discharging the working fluid from the inner passage to the plurality of external passages are formed,
And the plurality of external flow paths extend downward from the plurality of discharge parts.

The method of claim 10,
It further comprises an extension extending downward of the main body,
The plurality of external flow paths are arranged in parallel with the extension portion electrostatic spraying device.