KR20190032107A - Charging Unit and Electric Dust Collection Device having the same - Google Patents

Abstract

A charging unit and an electrostatic precipitator according to an embodiment of the present invention comprises: a plurality of counter electrodes arranged to face each other; and a discharge electrode spaced apart from the counter electrodes and disposed between the counter electrodes to generate a corona discharge between the counter electrode and the discharge electrode to charge dust in the air. A lower portion of the counter electrode gradually decreases in width on a section parallel to an air flow direction as the lower potion goes in a downstream direction of the air flow direction. The probability of charging dust particles in the air is increased, and the air discharged from the charging unit forms an axial flow, thereby enhancing the dust collecting efficiency.

Description

TECHNICAL FIELD [0001] The present invention relates to a charging unit and an electric dust collecting apparatus including the charging unit.

The present invention relates to an electric dust collector including a charging unit for causing a corona discharge for charging dust particles and a dust collecting unit for collecting charged dust particles.

Generally, an electric dust collecting apparatus is a device installed in an air conditioner such as an air purifier, a cooler, or a radiator to collect dust by charging the dust particles contained in the air.

The electric dust collecting apparatus mainly includes a charging unit for forming an electric field and a dust collecting unit for collecting dust particles charged by the charging unit. While the air passes through the charging unit and then passes through the dust collecting unit, the dust in the air is collected in the dust collecting unit.

The charging unit includes discharge electrodes and counter electrodes disposed in parallel with the discharge electrodes, and the dust is charged by the corona discharge between the discharge electrodes facing each other and the counter electrode.

The prior art (Korean Patent Laid-Open Publication No. 10-2011-0088742) has a structure in which a plate-shaped counter electrode is provided so as to face each other with a wire-shaped discharge electrode at the center.

In order to increase the charging probability in a predetermined air inflow space, there is a problem that a higher high voltage is used to improve the charging performance of such a conventional structure, There is a problem that the manufacturing cost of the discharge electrode is increased if the number of electrodes is increased.

Korean Patent Publication No. 10-2011-0088742 (Published on Aug. 4, 2011)

A problem to be solved by the present invention is to provide a charging unit and an electric dust collector which effectively increase the energy efficiency and reduce the generation of ozone while effectively charging dust particles in the air through a corona discharge.

Another object of the present invention is to provide a charging unit and an electric dust collector which do not increase the number of discharge electrodes, raise the voltage, and effectively charge dust particles in the air.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a charging unit and an electrostatic precipitator, including: a plurality of counter electrodes disposed opposite to each other and spaced apart from the counter electrodes, And a discharge electrode which generates a corona discharge between the electrodes and charges the dust in the air, wherein the lower portion of the counter electrode has a width gradually decreasing on a cross section parallel to the air flow direction as it is advanced in the downstream direction in the air flow direction .

Here, the counter electrode is disposed on the upper portion of the lower portion, and includes a center portion having a constant width on a cross section parallel to the air flow direction.

The width of the center portion may be greater than or equal to the largest width of the width of the lower portion.

The center portion may include a conductive material, and the lower portion may include an insulating material.

The counter electrode may further include a conductive electrode made of a conductive material disposed on an outer surface of the center portion.

The counter electrode may further include an upper portion disposed on the upper portion of the center portion and gradually increasing in width on a cross-section parallel to the air flow direction as it goes downstream in the air flow direction.

The details of other embodiments are included in the detailed description and drawings.

According to the charging unit and the electric dust collector of the present invention, there are one or more of the following effects.

First, the width of the lower portion of the counter electrode gradually decreases on a cross section parallel to the air flow direction as the lower portion of the counter electrode progresses in the downstream direction, so that the flow rate of air flowing into the charging space The distance between the discharge electrode and the charging surface is reduced, so that the probability of charging the dust particles in the air is increased, and the air discharged from the charging unit forms an axial flow, thereby improving the dust collecting efficiency.

Second, as the upper portion of the counter electrode extends in the downward direction, the width of the expanding portion increases to increase the flow velocity and flow rate of the air flowing into the charging space and to reduce the pneumatic hand, thereby increasing the probability of charging dust particles in the air There is an advantage.

Third, there is an advantage in that only the discharge electrode and the center portion where discharge occurs are made of a conductive material, thereby limiting the occurrence of unnecessary discharge.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view illustrating an electric dust collector according to an embodiment of the present invention.
2 is a cross-sectional view illustrating an electric dust collector according to an embodiment of the present invention.
FIG. 3 is a perspective view illustrating a frame in which the counter electrode shown in FIG. 1 is fixed.
4 is a conceptual diagram showing the structure of the charging unit shown in Fig.
5 is a sectional view showing the structure of the dust collecting unit shown in Fig.
FIG. 6 is a plan view showing a circuit diagram at an angle viewed from above the dust collecting unit shown in FIG. 5. FIG.
FIG. 7A is a perspective view showing the first film shown in FIG. 5. FIG.
7B is a perspective view showing the second film shown in Fig.
8 is a conceptual diagram showing a structure of a charging unit according to another embodiment of the present invention.
9 is a conceptual diagram showing the structure of a charging unit according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size and area of each component do not entirely reflect actual size or area.

The angles and directions mentioned in the description of the structure of the display device in the embodiment are based on those described in the drawings. In the description of the structure of the display device in the specification, reference points and the positional relationship with respect to angles are not explicitly referred to, refer to the related drawings.

The electric dust collecting apparatus of the present invention can be used as a partial apparatus in an air conditioner, an air cleaner, a vacuum cleaner or the like. Hereinafter, embodiments that are used as independent electric dust collectors will be described, but the present invention is not limited thereto.

The reference direction expressed throughout the description and the drawings will be described as follows. The U direction means the upward direction or the upstream direction, the D direction means the downward direction or the downstream direction, the X axis direction means the longitudinal direction, and the Y axis direction means the width direction.

In the present embodiment, the X axis direction and the Y axis direction are perpendicular to the up and down directions (U, D), but the X axis direction or the Y axis direction is inclined at an angle other than the vertical direction (U, D) Can be. However, the X-axis direction and the Y-axis direction are preferably perpendicular to each other.

The X-axis direction and the Y-axis direction can be defined as a comprehensive horizontal direction, and the plane formed by the X-axis and the Y-axis can be defined as a horizontal plane.

The 'potential' expressed below means the electric potential energy. The 'voltage' expressed below means a numerical value which means a difference of potential at two points.

Hereinafter, an electric dust collector according to an embodiment of the present invention will be described with reference to FIG. 1 is a perspective view illustrating an electric dust collector according to an embodiment of the present invention.

The electric dust collecting apparatus according to the embodiment of the present invention includes a case 10 forming an outer appearance of the electric dust collecting apparatus, a charging unit 20 charging the dust particles in the air, and a charging unit 20 charging the charged dust particles And a dust collecting unit (40).

The case 10 may include a charging case 11 for forming a space for accommodating the charging unit 20 therein and a dust collecting case 12 for forming a space for accommodating the dust collecting unit 40 therein have. The space for accommodating the charging unit 20 and the space for accommodating the dust collecting unit 40 are formed to be connected to each other.

In the present embodiment, the charging case 11 is disposed at the upper portion, the dust collecting case 12 is disposed at the lower portion, the charging unit 20 is disposed at the upper portion and the dust collecting unit 40 is disposed at the lower portion of the charging unit 20 But is not limited thereto.

An air inlet 15 through which air containing dust particles flows is formed in the case 10 and an air outlet 17 through which the air inside the case 10 flows out is formed. The air inlet 15 and the air outlet 17 may be formed in plural numbers. In this embodiment, the air inlet 15 is formed on the upper surface of the charging case 11, and the air outlet 17 is formed on the lower surface of the dust collecting case 12, but it is not necessarily limited thereto. The air inlet 15 may be formed by a frame 225 for fixing a counter electrode 222, which will be described later.

The overall air flow direction (A) is as follows. The air is introduced into the case 10 through the air inlet 15. The air introduced into the space inside the case 10 through the air inlet 15 sequentially passes through the charging unit 20 and the dust collecting unit 40 and then flows out to the outside through the air outlet 17. In another embodiment, the arrangement of the charging unit 20 and the dust collecting unit 40 may be reversed, and the charging unit 20 and the dust collecting unit 40 may be arranged as a bell. In this case, (20) toward the dust collecting unit (40).

Specifically, the air flow direction A is the up-and-down direction, and the charging unit 20 is disposed upstream (upper) of the airflow direction A than the dust collecting unit 40. The charging unit 20 and the dust collecting unit 40 are arranged so as to define a plane intersecting with the air flow direction A. [

3 is a perspective view showing a frame 225 to which the counter electrode 222 shown in FIG. 1 is fixed, FIG. 4A is a perspective view of the electric dust collecting apparatus according to an embodiment of the present invention, FIG. 4B is a plan view of the charging unit 20 shown in FIG. 1, in which the frame 225 is omitted to show the structure of the charging unit 20. FIG. FIG.

2 through 4, a charging unit 20 according to an embodiment of the present invention is separated from the counter electrode 222 and the counter electrode 222 and generates a corona discharge between the counter electrode 222 and the counter electrode 222 And discharging electrodes 240 for charging dust in the air.

A high voltage is applied to the discharge electrode 240. The high voltage is a value at which discharge occurs at the discharge electrode 240 because the voltage between the discharge electrode 240 and the counter electrode 222 is very high. The discharge electrodes 240 may be disposed in a plurality of locations. Specifically, the number of the discharge electrodes 240 is arranged to correspond to the number of the charging spaces 250 of the counter electrode 222.

More specifically, the plurality of discharge electrodes 240 may be spaced apart from each other by a predetermined distance on a horizontal plane (X-Y) that intersects the air flow direction (A). Preferably, the plurality of discharge electrodes 240 are elongated in the longitudinal direction (Y-axis direction) in the form of a wire. When the counter electrode 222 is in the form of a honeycomb forming a closed space in the horizontal plane, the discharge electrode 240 is arranged in a dot shape at the center of the closed space formed by the counter electrode 222 .

The material of the discharge electrode 240 may include at least a conductive metal, a conductive resin containing a suitable amount of conductive material in the polymer resin, and a plating resin plated on the surface of the polymer resin.

When a voltage is applied to the discharge electrode 240, a corona discharge is generated in the charging space 250 between the discharge electrode 240 and the counter electrode 222. The dust particles in the air are charged while passing through the charging unit 20. [

The counter electrode 222 generates a corona discharge between the discharge electrode 240 and the discharge electrode 240. The counter electrode 222 is disposed apart from the discharge electrode 240, and at least two thereof are disposed. A plurality of counter electrodes 222 are disposed facing each other with a discharge electrode 240 interposed therebetween.

The counter electrode 222 is disposed in parallel with the air flow direction for allowing dust contained in the air to pass therethrough while efficiently discharging dust in the air, The charging space 250 is defined by a predetermined distance.

That is, the counter electrode 222 has a shape that is opened in the up-and-down direction, which is the air flow direction A. For example, the counter electrode 222 may have a polygonal or circular structure in the horizontal cross section, or may have a plate shape elongated in one direction. Hereinafter, the description will be made with reference to a form in which the counter electrode 222 is elongated in one direction in a plate shape.

4, the plurality of counter electrodes 222 are elongated in the longitudinal direction and have a plate shape having a predetermined height in the up-and-down direction. The plurality of counter electrodes 222 are arranged to face each other with one discharge electrode 240 interposed therebetween. The space between the opposing electrodes 222 facing each other is defined as the charging space 250. A discharge is generated between the opposing electrode 222 and the discharge electrode 240 and the dust particles in the air are charged in the charging space 250.

Since the corona discharge generated between the discharge electrode 240 and the counter electrode 222 is limited in distance, the distance between the discharge electrode 240 and the counter electrode 222 can not be separated by a certain distance. Therefore, in order to charge a large amount of dust particles in the air, the plurality of counter electrodes 222 are spaced apart with a constant pitch in the width direction (X axis direction). The plurality of counter electrodes 222 and the plurality of discharge electrodes 240 are alternately arranged along the width direction. As a result, a plurality of charging spaces 250 are formed on the surface crossing the air flow direction A, and voids are generated between adjacent charging spaces 250, thereby preventing the charging efficiency from being lowered.

The structure of the discharge electrode 240 and the counter electrode 222 uses a higher high voltage to improve the charging performance, so that there is a problem that the amount of generated ozone is increased or electric power is applied to generate a spark or noise. If the number of the discharge electrodes 240 and the number of the counter electrodes 222 are increased in order to increase the probability of charging in the space, the manufacturing cost of the discharge electrode 240 increases.

The embodiment has a predetermined width of the counter electrode 222 so as not to increase the number of the discharge electrode 240 and the counter electrode 222 but to increase the charging probability of the dust particles in the air without increasing the supply voltage, The distance between the charging surfaces 221a, 221b, 223a, 223b, 225a, and 225b of the discharge electrode 240 and the counter electrode 222 (surface where the counter electrodes 222 adjacent to each other face each other) is reduced. Even if the same voltage is applied to the discharge electrode 240 as the distance between the discharge electrode 240 and the counter electrode 222 (the face on which the mutually adjacent counter electrodes 222 face each other) And the charging probability of the charged particles in the air is improved.

The pitch P1 between the counter electrodes 222 may be 10 mm to 15 mm and the pitch P2 between the discharge electrodes 240 may be 10 mm to 15 mm. The ratio of the pitch P1 between the counter electrodes 222 to the pitch P2 between the discharge electrodes 240 is 1: 0.7 to 1.5. The width W of the counter electrode 222 may be 1 mm to 10 mm.

However, in the case where the width of the counter electrode 222 is too large or has the same width, the air that has passed through the charging unit 20 can not be formed with an axial flow, and dust can not be efficiently collected in the dust collecting unit There is a problem that the air pressure loss between the counter electrodes 222 increases and the amount of air flowing into the charging space 250 becomes small.

In order to solve the above-described problems, the shape of the counter electrode 222 has a streamlined shape.

Specifically, the counter electrode 222 may include a center portion 223, a lower portion 221, a center portion 223, a lower portion 221, and an upper portion 225.

The center portion 223 is disposed on the upper portion of the lower portion 221 and is a region where the width remains constant on a section parallel to the air flow direction. The center portion 223 is disposed so as to overlap with the discharge electrode 240 as viewed in the horizontal direction (X-axis direction) intersecting with the air flow direction. Preferably, the discharge electrode 240 is disposed so as to overlap with the upper and lower center of the center portion 223 in the horizontal direction intersecting with the air flow direction. The center portion 223 may be formed symmetrically with respect to the central axis C1 of the counter electrode 222. [

The center portion 223 forms outer side surfaces 223a and 223b parallel to the air flow direction. The outer surface of the center portion 223 is also a charging surface where charging with the discharging electrode 240 occurs. The width W of the center portion 223 is equal to the width of the counter electrode 222. The center portion 223 has a constant width to reduce the distance between the discharge electrode 240 and the charging surface where discharge occurs.

The lower portion 221 has such a shape that its width progressively decreases on a cross section (U-X plane) parallel to the air flow direction as it goes downstream in the air flow direction. The lower portion 221 has a vertex at a position overlapping with the center axis C1 of the counter electrode 222 in the up-and-down direction as the width decreases toward the lower portion. Therefore, air passing through the charging space 250 is supplied to the dust collecting unit in the form of an axial flow, so that the dust collecting efficiency is improved.

The lower portion 221 forms an outer surface that is inclined with respect to the air flow direction. The inclination of the outer surfaces 221a and 221b of the lower portion 221 may be more gentle than the inclination of the upper portion 225. [ The lower portion 221 may be formed asymmetrically with respect to the center axis C1 of the counter electrode 222 parallel to the air flow direction, but is preferably formed symmetrically. When the lower portion 221 is symmetrically formed with respect to the center axis C1 of the counter electrode 222 parallel to the air flow direction, the probability that the air passing through the charging space 250 forms an axial flow is increased.

The width W of the center portion 223 is smaller than the width W2 of the lower portion 221 because the width of the lower portion 221 is larger than that of the center portion 223, 221 is larger than the widest width.

If the height H2 of the lower portion 221 is too high, the manufacturing cost is increased. If the height H2 is too low, it is difficult to form the side stream. Therefore, the ratio of the height H1 of the center portion 223 to the height H2 of the lower portion 221 is preferably 1: 0.5 to 1. The height H1 of the center portion 223 is usually 5 mm to 20 mm.

The upper portion 225 has such a shape that its width gradually increases on a cross section (U-X plane) parallel to the air flow direction as it goes downstream in the air flow direction. The upper part 225 has a vertex at a position overlapping with the central axis C1 of the counter electrode 222 in the vertical direction as the width of the upper part 225 progressively decreases from the center part 223. Accordingly, the flow velocity of the air flowing into the charging space 250 is increased, the air pressure loss is reduced, and the probability of charging the dust particles in the air is improved.

Upper portion 225 forms an outer surface that is inclined with respect to the air flow direction. The inclination of the outer surfaces 225a and 225b of the upper portion 225 may be larger than the inclination of the lower portion 221. [ The upper portion 225 may be formed asymmetrically with respect to the center axis C1 of the counter electrode 222 parallel to the air flow direction, but is preferably formed symmetrically.

When the width of the counter electrode 222 is larger than the width of the center portion 223, the pressure loss of the air flowing through the charging space 250 is increased. 225) is greater than the largest width.

If the height H3 of the upper portion 225 is too high, the manufacturing cost is increased. If the height H3 is too low, the air pressure loss is increased. Therefore, the ratio of the height H3 of the upper portion 225 to the height H1 of the center portion 223 is preferably 1: 2 to 3.

The material of the counter electrode 222 may include at least a conductive metal, a conductive resin containing an appropriate amount of conductive material in the polymer resin, and a plating resin plated on the surface of the polymer resin.

Specifically, the center portion 223, the lower portion 221, and the upper portion 225 may all be formed of a conductive material. When the center portion 223, the lower portion 221, and the upper portion 225 are all formed of a conductive material, there is an advantage that they are easy to manufacture.

The center portion 223 is made of a conductive material and the upper portion 225 and / or the lower portion 221 may include an insulating material. have.

Referring again to FIG. 3, the charging unit 20 of the embodiment may further include a frame 225 to arrange the plurality of counter electrodes 222 and to constrain the positions of the plurality of counter electrodes 222.

The frame 225 fixes the positions of the plurality of counter electrodes 222. The frame 225 may define the air inlet 15 in a lattice form.

Fig. 5 is a cross-sectional view showing the structure of the dust collecting unit shown in Fig. 1, Fig. 6 is a plan view showing a circuit diagram at an angle viewed from above the dust collecting unit shown in Fig. FIG. 7B is a perspective view showing the second film shown in FIG. 5. FIG.

The dust collecting unit 40 may have various configurations for filtering the charged particles. For example, the dust collecting unit 40 may include a general filter or an electric field filter.

5 to 7, the dust collecting unit 40 according to an embodiment of the present invention includes a plurality of conductive layers 51a to which a relatively high potential is applied, 1 film 41 and a plurality of second films 42 coated with an insulating layer 52b with a conductive layer 51b to which a low electric potential is applied relatively to the conductive layer 51a of the first film 41, . That is, the plurality of films 41 and 42 are provided by coating the conductive layer 51 with two insulating layers 52 on both sides with the conductive layers 51 disposed therebetween. The dust collecting unit 40 includes a fixing unit (not shown) for fixing both ends of the plurality of first films 41 and the plurality of second films 42 in the longitudinal direction Y inside the case 10 .

The plurality of first films (41) and the plurality of second films (42) are alternately arranged. The plurality of first films 41 and the plurality of second films 42 are arranged so that the width direction is the vertical direction (U, D), but the present invention is not limited thereto. The plurality of first films 41 and the plurality of second films 42 may be arranged in parallel so that the longitudinal directions Y coincide with each other. A plurality of the first films 41 and the plurality of second films 42 are arranged in a direction alternately in the direction X in the width direction U and the direction Y and the direction Y in the longitudinal direction Y . In this embodiment, about 20 to 30 first films 41 and second films 42 are alternately arranged, respectively.

6, the dust collecting unit 40 includes a voltage source 81 for generating a high potential, a first conductive line 51b for connecting the conductive layer 51b of the second film 42 and a negative electrode of the voltage source 81, And a second conductive line 84 connecting the positive electrode of the voltage source 81 and the conductive layer 51a of the first film 41. [ The first conductive line 83 is connected to the ground 82 to form the first conductive line 83 and the conductive layer 51b of the second film 42 is connected to the first conductive line 83, May be provided so as to have a relatively low electric potential with respect to the conductive layer 51a of the film 41. [ The voltage source 81 may be provided so that the voltage difference between the conductive layer 51a of the first film 41 and the conductive layer 51b of the second film 42 is about 7 to 9 kV.

Referring to Fig. 7, the first film 41 and the second film 42 are elongated in a strip shape. The strip-shaped lengths of the first film 41 and the second film 42 may be about 200 to 250 mm. The entirety of the first film 41 and the second film 42 may be formed in a flat plate shape. The first film 41 and the second film 42 may be formed so as to be at least partially bent in the both-side direction X. [

The conductive layer 51 of the plurality of films 41 and 42 may be made of a carbon material. The conductive layer 51 may have a thickness of 10-100 μm. The conductive layer 51a of the first film 41 constitutes a high potential electrode and the conductive layer 51b of the second film 42 constitutes a low potential electrode.

The pair of insulating layers 52 apply the remaining part except the part of the conductive layer 51 with the conductive layer 51 interposed therebetween. The insulating layer 52 may be made of a material such as PP, PET, PEN, PU or the like and may include a nanofiller such as TiO ₂ , Al ₂ O ₃ , SiO _2, etc., and its thickness may be 100-1500 μm.

The conductive layer 51 is provided in a carbon pattern screen-printed on one surface of one of the pair of insulating layers 52 and the other of the pair of insulating layers 52 covers the rest except for a part of the carbon pattern And can be adhered to any one insulating layer 52.

A part of the conductive layer 51 of the plurality of films 41 and 42 can be exposed to the outside and the remainder is surrounded by the insulating layer 52. [

The portion of the conductive layer 51a of the first film 41 which is not surrounded by the insulating layer 52a constitutes the high potential connection portion 57. [ The high potential connection 57 contacts the second lead 84. The high-potential connecting portion 57 contacts the first electrode connecting portion 232, which will be described later, which forms a part of the second lead 84. A high potential is applied to the conductive layer 51a of the first film 41 through the high potential connection portion 57. [

A portion of the conductive layer 51b of the second film 41 which is not surrounded by the insulating layer 52b constitutes a low potential connecting portion 58. [ The low potential connection portion 58 contacts the first conductor 83. The low potential connection portion 58 is in contact with a second electrode connection portion 232 which will be described later, which constitutes a part of the first lead wire 83. A low potential is applied to the conductive layer 51b of the second film 42 through the low potential connection portion 58. [

When a relatively high potential is applied to the conductive layer 51a of the first film 41 and a relatively low potential is applied to the conductive layer 51b of the second film 42, An electric field is generated. The dust particles charged in the charging units 20 and 10 are subjected to an electric force in the electric field in accordance with the charged polarity so that the insulating layer 52a of the first film 41 or the insulating layer 52b of the second film 42 ).

At both ends in the longitudinal direction (Y) of the plurality of first films (41) and the plurality of second films (42), there is provided a bent hook 55 extending from the film. The hooking hooks 55 are each formed by bending at both ends in one side portion in the longitudinal direction Y and in the width direction U and D, respectively. The hooking grooves 56 in the width directions U and D are formed at both end portions in the longitudinal direction Y of the first film 41 and the second film 42 due to the bent shape of the hooking hook 55 .

In the present embodiment, the hooking hooks 55 are formed at both ends of the hooking portion 55, the upper portion of which extends in the longitudinal direction and is bent in the downward direction (D). At both ends in the longitudinal direction Y of the first film 41 and the second film 42, a locking hook groove 56 recessed in the upward direction U may be formed at the lower end.

And the engagement hook 55a in which the conductive layer 51 is exposed and the engagement hook 55b in which the conductive layer 51 is not exposed. The plurality of first films 41 are provided so that the conductive layer 51a is exposed only at the hooking hooks 55a at one end of the both ends and the plurality of second films 42 are hooked at the other end of the opposite end of the one end So that the conductive layer 51b is exposed only in the hook 55a. That is, the high-potential connecting portions 57 provided on the plurality of first films 41 are formed only on the hooks 55a formed on one side of both ends, and the low-potential connecting portions (not shown) provided on the plurality of second films 42 58 are formed only on the hooking hook 55a formed on the other of the both ends.

A gap S through which air flows is formed between the first film 41 and the second film 42. (Not shown) is provided between the first film 41 and the second film 42 to hold the gap S and to be fixed only by the first film 41 or the second film 42 .

8 is a conceptual diagram showing the structure of the charging unit 20 according to another embodiment of the present invention.

Referring to FIG. 8, the charging unit 20 of another embodiment is different from the embodiment of FIGS. 1 to 4 in the configuration of the counter electrode 222. Hereinafter, the differences from the embodiments of FIGS. 1 to 4 will be mainly described, and the parts without other description are the same as the embodiments of FIGS. 1 to 4. FIG.

The counter electrode 222 of the present embodiment further includes a conductive electrode 227 made of a conductive material disposed on the outer surface of the center portion 223.

The conductive electrode 227 may be inserted or coated on the outer surface of the center portion 223. Specifically, the conductive electrode 227 is a conductive paste coated on the outer surface of the center portion 223. The conductive electrode 227 has a size corresponding to the outer surface of the center portion 223. The conductive electrode 227 is elongated along the longitudinal direction of the counter electrode 222.

At this time, the center portion 223, the lower portion 221, and the upper portion 225 include an insulating material. Specifically, the center portion 223, the lower portion 221, and the upper portion 225 may include a synthetic resin.

Fig. 9 is a conceptual diagram showing the structure of the charging unit 20 according to still another embodiment of the present invention.

Referring to Fig. 9, the charging unit 20 of another embodiment has a difference in which the upper portion 225 is omitted in the embodiment of Figs. 1-4. Hereinafter, the differences from the embodiments of FIGS. 1 to 4 will be mainly described, and the parts without other description are the same as the embodiments of FIGS. 1 to 4. FIG.

The counter electrode 222 of this embodiment may include only the center portion 223 and the lower portion 221. In this case, although the pneumatic hand of the air to be introduced is slightly increased, the probability of charging the dust particles is increased, and the air discharged from the charging unit 20 is improved in the dust collecting efficiency in the form of an axial flow.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

10: Case 11:
12: dust collecting case 15: air inlet 17: air outlet 20: charging unit
40: dust collecting unit 240: discharge electrode
220: counter electrode

Claims (17)

A plurality of counter electrodes arranged to face each other; And
And a discharge electrode spaced apart from the counter electrodes and disposed between the counter electrodes to generate a corona discharge between the counter electrode and the counter electrode to charge dust in the air,
Wherein the lower portion of the counter electrode gradually decreases in width on a cross section parallel to the air flow direction as it goes downstream in the air flow direction. The method according to claim 1,
The above-
And a center portion disposed on the upper portion of the lower portion and having a constant width on a section parallel to the air flow direction. 3. The method of claim 2,
Wherein the center portion is disposed so as to overlap with the discharge electrode as viewed in a horizontal direction crossing with an air flow direction. 3. The method of claim 2,
Wherein the width of the center portion is greater than or equal to the largest width of the width of the lower portion. 3. The method of claim 2,
And the center portion forms an outer side surface parallel to the air flow direction. The method according to claim 1,
Wherein the lower portion forms an outer surface that is inclined with respect to an air flow direction. The method according to claim 1,
Wherein the lower portion is formed symmetrically with respect to a center axis of the counter electrode parallel to the air flow direction. 3. The method of claim 2,
Wherein the center portion comprises a conductive material,
Wherein the lower portion includes an insulating material. 3. The method of claim 2,
Wherein the counter electrode further comprises a conductive electrode of a conductive material disposed on an outer surface of the center portion,
Wherein the center portion and the lower portion include an insulating material. 10. The method of claim 9,
The conductive electrode may include:
And a conductive paste coated on an outer surface of the center portion. 3. The method of claim 2,
Wherein a ratio of a height of the center portion to a height of the lower portion is 1: 0.5 to 1. 3. The method of claim 2,
The above-
And an upper portion disposed on the upper portion of the center portion, the upper portion gradually expanding in width on a section parallel to the air flow direction in a downstream direction in the air flow direction. 13. The method of claim 12,
Wherein the maximum width of the width of the upper portion is smaller than or equal to the width of the center portion. 13. The method of claim 12,
Wherein the center portion comprises a conductive material,
Wherein the lower portion and the upper portion include an insulating material. 13. The method of claim 12,
Wherein the ratio of the height of the upper portion to the height of the center portion is 1: 2 to 3. The method according to claim 1,
Further comprising a frame defining a plurality of air inlets into which the air is introduced and which confines the position of the plurality of counter electrodes. An electric dust collector comprising the charging unit according to any one of claims 1 to 16.

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