KR20230037322A - Radial dust collecting needle for electrostatic precipitation - Google Patents

Abstract

The present invention is to provide a radial dust collecting needle with greatly improved dust collecting ability through excellent discharge and dust collection efficiency. In a radial dust collecting needle (600) for electrostatic precipitation, a first triangular discharge part (610) having a triangular shape is continuously connected to an outer surface toward the outside, a through hole (620) is perforated in an inner center, and a second triangular discharge part (630) having a triangular shape is continuously connected to an inner surface of the through hole (620) toward the inside.

Description

Radial dust collecting needle for electrostatic precipitation}

The present invention relates to a radial dust collecting needle for electric dust collection, which is formed by continuously connecting a triangular first triangular discharge part 610 in an outward direction on an outer surface, and a through hole 620 is perforated at the inner center, , It relates to radial dust collection needles for electric dust collection, characterized in that formed by continuously connecting the second triangular discharge portion 630 in a triangular shape in an inward direction to the inner surface of the through hole 620.

In general, an electrostatic precipitator is a device that applies an electric field to a gas, particularly dust suspended in the air, to make it electrified, and collects particles with an electrostatic force to clean the gas. Depending on the method of removing dust collected in the dust collector, there are wet and dry types, and there are vertical and horizontal ones according to the flow of gas.

The principle of this electrostatic precipitator is to set a cylindrical dust collection electrode as positive, apply negative DC high voltage to a discharge line suspended in the center of the cylinder, and then dust inside the cylinder. When air containing is sent from the bottom, the dust becomes negatively charged and adheres to the inner surface of the cylinder, and the air flowing out to the top of the cylinder becomes clean. Dust accumulated in the cylinder is generally removed by washing with water or applying mechanical shock to the cylinder.

The former is called wet dust collector and the latter is called dry dust collector. There are horizontal and vertical gas flows. The former is suitable for cleaning a large amount of gas, and the latter has the advantage of efficiently collecting dust and having a small installation area. To create direct current high voltage, 40,000 to 70,000 volts are made using a voltage regulator, special high-voltage transformer, and rectifier using 50 or 60 Hz AC power. High-voltage rectifier tubes or silicon rectifiers are used as rectifiers. Regardless of which one is used, the method of limiting the overcurrent when the DC high-voltage side is short-circuited must be considered.

On the other hand, these electric precipitators have been disclosed through various embodiments, and among them, “two-stage charged electric precipitator (Republic of Korea Utility Model Registration No. 20-0302935)” of Patent Document 1 is posted.

The "two-stage charge-type electric precipitator" of Patent Document 1 is provided with a space of a certain size inside, a normal ventilation fan (2) is installed, and an inlet (3) through which air is introduced and an outlet (4) through which air is discharged. It is provided on the side of the body (5) and the inlet (3) of the space of the body (5) and collects harmful substances of large particles contained in the air containing harmful substances that are introduced and moved by the ventilation fan (2). A pre-filter member (6) that removes and moves in an even distribution, a discharge member (7) that positively charges incoming foreign substances to positively charge pollutants, and a negative charge for harmful substances discharged from the discharge member (7) Dust collection formed by a dust collecting member 9 that collects and purifies dust by an electrode plate 16 having an even distribution of air purified by the dust collecting member 9 and an after filter member 10 that prevents re-dispersion of contaminants It is characterized by means (11), as well as harmful substances of large particles such as dust, as well as various harmful substances in the air at industrial sites such as restaurants, homes, offices and factories (eg; oil smoke at restaurants, generated during welding welding gas containing heavy metals, smoke generated during heat treatment, soldering fumes, plasticizer fumes such as oil mist, fume, DOP, harmful dust accompanied by odors, and other air pollutants) containing heavy metals. It had the advantage of being able to remove harmful substances.

However, the "two-stage charge-type electric precipitator" of Patent Document 1 has a problem in that the discharge and dust collection efficiency is low because the discharge member of the general structure is used, and the dust collection capacity is low.

Patent Document 1: Korean Utility Model Registration No. 20-0302935

The present invention has been made to solve the above problems, and an object of the present invention is to provide radial dust collecting needles with greatly improved dust collecting ability through excellent discharge and dust collection efficiency.

In addition, without using a separate high voltage pulse device, it provides an advantage of showing a pulse of power five times greater than the waveform of a normal needle nozzle.

In addition, it is to provide an electric precipitator equipped with radial dust collecting needles having a peak current waveform superior to that of a normal needle nozzle.

In addition, it is to provide an electric precipitator equipped with radial dust collection needles having a high ionization value and low power consumption, which has an energy saving effect.

In order to solve the above problems, the radial dust collection needle for electric dust collection according to the present invention is formed by continuously connecting the triangular first triangular discharge part 610 in an outward direction to the outer surface, and has a through hole in the inner center. 620 is perforated, and a triangular second triangular discharge portion 630 is continuously connected to the inner surface of the through hole 620 in an inward direction.

In addition, the first triangular discharge unit 610 and the second triangular discharge unit 630 are each formed in an isosceles triangle shape.

In addition, the base angle G1 of the first triangle discharge part 610 is formed larger than the base angle G2 of the second triangle discharge part 630 .

In addition, it is characterized in that the triangular first triangular discharge portion 610a is continuously connected to the outer surface in an outward direction, and the through hole 620a is perforated at the inner center.

In addition, curved surface radial projections 611, 611a, and 631 formed of curved surfaces are formed at the vertices of the first triangular discharge parts 610 and 610a or the second triangular discharge part 630, respectively.

As described above, according to the present invention, there is an advantage in that discharge and dust collection efficiency is greatly improved through radial dust collector needles in which discharge is generated doublely on the outside and inside or installed in multiple numbers on a horizontal surface to generate discharge in multiple directions. .

In addition, there is an advantage of showing a pulse of 5 times the implied force for a time of 1/18 to 1/4 compared to the waveform of the general needle nozzle.

In addition, it has the advantage of having a peak current value and superior power content compared to the waveform of the normal needle nozzle.

In addition, the actual power consumption is very small, so there is an energy saving effect.

1 is a perspective view showing the appearance of an electric dust collector
Figure 2 is a perspective view showing the overall appearance of radial dust collecting needles for electric dust collection according to a preferred embodiment of the present invention
Figure 3 is a cross-sectional perspective view showing a radial dust collection needle for electric dust collection according to a preferred embodiment of the present invention is installed inside the dust collection pipe
4 is an exploded perspective view showing an exploded view of radial dust collection needles for electric dust collection and internal components of a dust collection pipe according to a preferred embodiment of the present invention;
5 is a cross-sectional view showing the movement of (+) poles and (-) poles in a dust collecting pipe including radial dust collecting needles for electric dust collection according to a preferred embodiment of the present invention and a resistance (R) range of each radial dust collecting needle.
6 is a diagram explaining a DPP current measurement picture of a supply voltage of 17.5KDC and 10us (100Khz).
7 is a diagram illustrating time off and time on pictures of DPP.
8 is a diagram illustrating a current value when power is dissipated.
9 is a diagram illustrating power pulse generation time as implied force divergence time.
FIG. 10 is a diagram showing a low state power value actually consumed in a high output state.
11 and 12 are views showing corona current waveforms and pulses of a normal needle nozzle according to the strength of an electric field.
13 is a perspective view showing the entire appearance of radial dust collecting needles for electric dust collection according to another preferred embodiment of the present invention.
14 is an exploded perspective view showing an exploded view of radial dust collection needles for electric dust collection and internal components of a dust collection pipe according to another preferred embodiment of the present invention.
15 is an internal view showing the inside of a dust collection pipe equipped with radial dust collection needles for electric dust collection according to another preferred embodiment of the present invention.
16 is a cross-sectional view showing the movement of (+) poles and (-) poles in a dust collector including radial dust collector needles for electric dust collection according to another preferred embodiment of the present invention.

Hereinafter, the radial dust collection needles 600 and 600a for electric dust collection according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that among the drawings, the same components or parts are indicated by the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the gist of the present invention.

Prior to the description, the electric dust collector 1 equipped with radial dust collection needles according to an embodiment of the present invention includes a fan, a motor, a PCB, a power supply device, and interlocking driving elements so that the operation can be performed smoothly. Since the principle of configuring and operating the driving elements corresponds to a level of technology widely known in the field to which the present invention belongs, a detailed description thereof will be omitted.

In addition, it should be noted that some components of the present invention are omitted in some drawings for detailed and clear description of the present invention.

On the other hand, in order to make the description of the present invention clear and detailed, the part about the dust collecting unit 300 will be described at the beginning. At this time, as shown in FIG. 1, it is possible to consist of two dust collectors (numbered 300 and 400), and it should be noted that the description is based on one dust collector.

First, the dust collecting unit 300 will be described. As shown in FIG. 3, FIG. 4 or 5, the dust collection unit 300 is a component in which electric dust collection of air containing harmful substances is performed, and the air containing harmful substances is provided in the housing 100. is connected to an inlet (not shown) through which dust collection is introduced, and when the secondary dust collection process is performed, it is connected to another electric dust collecting unit 400. connected with

The electric precipitator 300 is largely divided into a first connection pipe 310, a dust collection pipe 320, a first electricity application unit 330, a second electricity application unit 340, and a second connection tube 350. It is done.

The first connection pipe 310 is formed in a tubular shape at a portion where the electrostatic precipitator 300 and the housing 100 are coupled and is connected to an inlet (not shown), so that the first connection pipe 310 passes through the inlet (not shown). It enables the air containing the inflowing harmful substances to be moved to the dust collecting pipe 320 .

The dust collection pipe 320 is formed in a cylindrical shape, has upper and lower openings, and is a kind of cylindrical pipe made of space inside. 2 electricity applying units 330 and 340 and the radial dust collecting needles 600 and 600a of the present invention are provided.

The first electricity applying unit 330 is a component that is formed from the upper side of the dust collector 320 to the inside and supplies electricity of the (+) pole from the outside, and includes a first transmission shaft 331 and a transmission disk. (332) and a second transmission shaft (333).

The first transmission shaft 331 is a component provided on the upper side of the dust collection pipe 320 and directly supplied with (+) polarity electricity from the outside. It is preferable to be fixed to the sealing cover 810 by penetrating the sealing cover 810 made of an insulating material detachably coupled to the upper side of the 320 for sealing.

At this time, fixing nuts may be provided on the upper and lower sides of the first transmission shaft 331 so that the first transmission shaft 331 may be closely fixed to the sealing cover 810 and fastened thereto.

The transfer disk 332 is a component coupled to the lower portion of the first transfer shaft 331 in a state located on the inner upper side of the dust collector 320, and electricity of the (+) pole flows, which will be described later. A plurality of two transmission shafts 333 are coupled to guide the flow of electricity of the (+) pole to the second transmission shaft 330.

On the other hand, the transmission disk 332 is formed in a disk shape having the same concentricity as the dust collection pipe 320, so that the second transmission shaft 333 is spaced at a constant interval on the inner side of the dust collection pipe 320. have and enable placement.

A plurality of second transmission shafts 333 are coupled at regular intervals along the outer circumferential side of the transmission disc 332 (expressed as four installed in one embodiment) and transmitted through the transmission disc 332 ( As a component through which electricity of +) polarity flows, the upper part of the second transmission shaft 333 is coupled to the transmission disc 332, and the lower part of the second transmission shaft 330 is the first dust collector 320 ) is coupled to the pedestal 820 of an insulating material fixed to the inner lower part of the second transmission shaft 330 to prevent the (+) polarity electricity from flowing to the dust collector 320.

At this time, a through hole 821 is perforated at the center of the pedestal 820 so that a third transmission shaft 342 to be described later through which electricity of the (-) pole flows passes.

The second electricity applying unit 340 is formed from the lower side of the dust collecting pipe 320 to the inside and does not interfere with the first electricity applying unit 330 and applies (-) polarity electricity separately supplied from the outside. As a component to be, it consists of a support plate 341 and a third transmission shaft (342).

The support plate 341 is provided on the lower side of the dust collecting pipe 320 and serves to support the third transmission shaft 342 .

At this time, it is preferable that the pedestal 820 and the support plate 341 are positioned apart from each other by a predetermined distance.

The third transmission shaft 342 is coupled to the center of the support plate 341 and passes through the through hole 620 of the radial dust collecting needle 600 located inside the dust collecting pipe 320 to form the radial shape. As a component through which electricity of the (-) pole is transmitted while being spaced apart from the dust collecting needles 600, the inside of the radial dust collecting needles 600 and the first dust collecting pipe 320 are caused by the third transmission shaft 342. ), it becomes possible for (-) pole electricity to be radiated to the inner surface.

Depending on the structure, the second connection pipe 350 is connected to an outlet (not shown) to send the purified air from the electric dust collector 300 back to equipment such as an external soldering facility or to another electric dust collector ( 400) is a kind of pipe that is connected to a connection pipe (not shown) and guides the movement of air after the first dust collection operation to enable the second dust collection operation to be performed.

Hereinafter, the radial dust collection needles 600 and 600a for electric dust collection according to an embodiment of the present invention will be described.

First, as shown in FIGS. 2, 3, 4, or 5, the radial dust collecting needles 600 through an embodiment are spaced apart in the vertical direction one by one on the horizontal side of the second transmission shaft 333. As a component that generates a discharge for electric dust collection while being supplied with (+) pole electricity from the second transmission shaft 333, a coupling hole 601, a first triangular discharge unit 610, a through It consists of a ball 620 and a second triangular discharge unit 630.

The coupling holes 601 are formed on the surface of the radial dust collecting needles 600 at the same position and in the same number as the second transmission shaft 333 to be inserted into and coupled to the second transmission shaft 333. do.

The first triangular discharge part 610 is a component forming a radial shape by continuously connecting to the outer surface of the radial dust collecting needle 600 in a triangular shape in an outward direction, and the first triangular discharge part 610 Condensed (+) pole electricity is radiated from the corner.

The through hole 620 is a component that is perforated at the inner center of the radial dust collecting needle 600, and a second triangular discharge part 630 to be described later is formed, and flows from the lower part of the dust collecting pipe 320 to the inside. The formed third transmission shaft 342 passes through, and electricity of the (-) pole is radiated from the inside of the radial dust collection needle 600, and a discharge is generated inside the radial collection needle 600, so that the dust collection operation is performed. make it possible

The second triangular discharge part 630 is a component forming a radial shape by being connected to the inner surface of the through hole 620 in a triangular shape in an inward direction. Condensed (+) pole electricity is radiated from

Through this configuration, the radial dust collection needles 600 have the effect of greatly increasing the dust collection efficiency by performing a double dust collection operation on the outside and inside of the radial dust collection needles 600 while being able to function as a capacitor. .

On the other hand, in the radial dust collecting needle 600, the first triangular discharge part 610 and the second triangular discharge part 630 are each formed in an isosceles triangle shape, and the base angle of the first triangular discharge part 610 ( When G1) is formed larger than the base angle G2 of the second triangular discharge part 630, experimental data values to be described later can be obtained, and the best dust collection ability can be exhibited through the present invention.

On the other hand, since curved surface radiation protrusions 611 and 631 made of curved surfaces are formed at the vertices of the first triangle discharge part 610 and the second triangle discharge part 630, respectively, it is possible to widen the radiation range and collect dust. It becomes possible to further increase the efficiency.

On the other hand, a spacing pin 700 is installed between the radial dust collection needles 600 to space each of the radial dust collection needles 600 inserted into the second transmission shaft 333 vertically at a predetermined distance.

Although the structure of the electric dust collecting part 300 and the radial dust collecting needles 600 have a layered coupling structure, through the structure and coupling relationship of the present invention, the resistance of each of the radial dust collecting needles 600 The values (R1, R2, R3, R4, R5,...) become the same.

That is, as shown in [Electrical Equation 1] below, since the same voltage (V) is supplied from the outside and the resistance (R) is the same, the current (I) of the radial dust collecting needles 600 at all positions is uniformly the same. Thus, a short circuit does not occur in the radial dust collecting needles 600 on the uppermost layer, preventing the sealing cover 810 from being deformed or damaged.

[Electrical formula 1]

Hereinafter, with reference to FIGS. 6 to 12, the current used in the electrostatic precipitator to which the radial dust collection needle 600 for electrostatic precipitate according to an embodiment of the present invention is applied is measured through an oscilloscope, and the power consumed and the implied power are measured. and the like, and through this, the technical effects of the present invention are described.

First, FIG. 6 is a diagram illustrating a picture of measuring dc pulse power (DPP) current of a supply voltage of 17.5k DC and 10us (100Khz).

As shown in FIG. 6, a power pulse of 17,500v may be supplied in the form of direct current to the electric precipitator.

Pulse power of 17,500v supplied in the form of direct current can be output in a form in which force condensation and power dissipation for a certain period are periodically repeated in the electric precipitator.

This is disclosed through FIG. 7 .

7 is a diagram illustrating time off and time on pictures of DPP (dc pulse power).

As shown in FIG. 7, the measurement signal displayed on the oscilloscope shows a form in which a period of time off, which is a period in which force is implied for a certain period of time, and a period of time on, which is a period in which implied power is diverged, are periodically repeated. .

As shown on the oscilloscope, the period in which the force is implied appears as a time-off period of 7.40us for the entire period of 10.0us, and the period in which the implied force is dissipated is measured as a time-on period of 2.60us during the current period of 10.0us. do.

This means a pattern in which force is dissipated only in about 1/4 of the entire cycle and force is implied in the remaining 3/4, indicating that efficient power use is possible through this pattern.

8 is a diagram illustrating a current value when power is dissipated.

The current dissipated during the actual time on section can be calculated through [Equation 2] below.

[Electrical formula 2]

Current value when pulse power is emitted (time on) = pulse measurement voltage/resistance

Looking more specifically, the current value dissipated in the time on section measured by the oscilloscope is 2.7v, and the resistance used at this time is measured as 100 ohm. Therefore, the current value obtained by dividing 2.7v by 100 ohms can be calculated as 27mA.

In general, in the case of a simple needle-shaped nozzle, a current of 10 to 100 uA is output, whereas the current value measured by the electric precipitator according to the present invention is 27 mA, which is 500 times or more of the above value.

As a result, the present invention can significantly improve dust collection efficiency.

9 is a diagram illustrating pulse power generation time as implied force divergence time.

As shown in FIG. 9, as a result of precisely measuring the implied force divergence time of the power pulse measured from the waveform generated by adjusting the vertical cursor of the oscilloscope, it can be confirmed that it is measured for approximately 2.6 us, not less than 2 us.

10 is a diagram showing expected power and actually consumed power in normal conditions.

The required power can be calculated as [Equation 3] below.

[Electric formula 3]

P=EI (Where P is required power, E is pressure voltage, and I is required current)

More specifically, according to the previous measurement, a power of 470 watts should be consumed through a voltage of 17,500v and a current consumption of 27mA.

However, in reality, since power is consumed only when the power is dissipated in the time on section, not in the time off section in which power is implied, it can be confirmed that only 86w is consumed, as shown in the electricity rate meter of FIG. 16.

Therefore, while the total power actually used through the present invention is 86 watts, the instantaneous output must be 470 watts. Therefore, the desired power cannot be generated using the existing domestic 18KDC, 7.5mA power supply, so the existing power supply cannot discharge. can solve the problem That is, it proves that this device is a pulse power.

11 is a diagram showing a time interval between general acicular corona current waveforms and pulses according to the strength of an electric field.

As shown in FIG. 11, the time of time on and time off of the waveform pattern of the existing general acicular nozzle is quite long.

The waveform shown in FIG. 11 shows that the waveform of the conventional acicular type corona current does not have a pulse in the middle, but the peak current is very low at most of 10mA.

In addition, the corona current is a conventional simple needle-shaped nozzle, which generally appears in the range of 10 to 100us, and the present invention has a current voltage with power inclusion of 27 to 35mA, as shown in the above experimental data.

On the other hand, as shown in FIG. 12, the time interval of the corona pulse of the existing general acicular nozzle is in the range of about 38 to 180 us.

That is, the waveform time of the conventional needle-type nozzle is 38 to 180 us, but the time of the present invention is 10 us, which has a pulse of 5 times the power.

As a result, the use of the present invention has the advantage of showing a pulse of 5 times the implied force for 1/18 to 1/4 of the time compared to the waveform of the normal needle nozzle, and the current with superior power content compared to the waveform of the normal needle nozzle voltage can be displayed.

Therefore, when the present invention is used, power cost reduction and dust collection capability can be significantly improved compared to conventional electric dust collectors.

Hereinafter, radial dust collection needles 600′ for electric dust collection according to another embodiment of the present invention will be described.

First, as shown in FIGS. 13, 14, 15 or 16, the radial dust collection needles 600a through another embodiment are horizontally transmitted to a plurality of second transmission shafts 333. A component that generates discharge for electric dust collection while receiving electricity of the (+) pole from each of the second transmission shafts 333, which is installed one by one on each shaft 333 and is arranged in a plurality spaced apart in the vertical direction, It consists of a first triangular discharge portion 610a and a through hole 620a.

The first triangular discharge part 610a is a component forming a radial shape by being continuously connected in a triangular shape in an outward direction to the outer surface of the radial dust collecting needle 600a. Condensed (+) pole electricity is radiated from the corner.

On the other hand, since the curved surface radial projection 611a formed of a curved surface is formed at the apex of the first triangular discharge part 610a, it is possible to widen the radiation range compared to the case where the corner is sharp, and the dust collection efficiency is further increased. becoming possible

The through hole 620a is a component punched in the inner center of the radial dust collecting needle 600a, and enables the radial dust collecting needle 600a to be inserted and coupled to the second transmission shaft 333. .

On the other hand, a spacing pin 700 is installed between the radial dust collection needles 600a to space each of the radial dust collection needles 600a inserted into the second transmission shaft 333 vertically at a predetermined distance.

On the other hand, at least four second transmission shafts 333 are installed at symmetrical positions up, down, left, and right, and as shown in FIG. 15, each of the second transmission shafts 333 has radial dust collection needles. (600a) is provided.

In addition, the number of the first triangular discharge parts 610a of the radial dust collecting needles 600a coupled to each of the second transmission shafts 333 is at least 6, so that the inside of the dust collection pipe 320 At least three of the first triangular discharge parts 610a of each of the radial dust collection needles 600a in contact with the side surface face each other so that discharge can be made evenly on the entire inner surface of the dust collection tube 320.

Through this configuration, the radial dust collection needles 600a can function as a capacitor, and the radial dust collection occurs due to the arrangement of the second transmission shaft 333 and the structure and arrangement of the radial dust collection needles 600a. Dust collection is evenly performed between the needle 600a and the inner surface of the dust collector 320, so that the dust collection efficiency is greatly increased.

Optimal embodiments have been disclosed in the drawings and specifications. Although specific terms have been used herein, they are only used for the purpose of describing the present invention and are not used to limit the scope of the present invention described in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: electrostatic precipitator
100: housing
200: inlet
300: first electric dust collector
310: first connector 320: first dust collector
330: first electricity application unit 331: first transmission shaft
332: transmission disk 333: second transmission shaft
340: second electricity application unit 341: support plate
342: third transmission shaft
350: second connector
400: second electric dust collector
600, 600a: radial dust collection needle 601: coupling hole
610, 610a: first triangular discharge unit 611, 611a: 631: curved radial projection
620, 620a: through hole 630: second triangular discharge unit
700: spacing pin
810: sealing cover 820: pedestal

Claims (5)

In the radial dust collection needle 600 for electric dust collection provided inside the dust collection tube 320 of the electric dust collector 1 and assisting in generating a discharge through the application of electricity,
The first triangular discharge portion 610 in a triangular shape is continuously connected to the outer surface in an outward direction,
A through hole 620 is perforated at the center of the inside,
Radial dust collection needles 600 for electric dust collection, characterized in that formed by continuously connecting the second triangular discharge portion 630 in a triangular shape in an inward direction to the inner surface of the through hole 620. According to claim 1,
The first triangular discharge part 610 and the second triangular discharge part 630 are radial dust collection needles 600 for electric dust collection, characterized in that each formed in the form of an isosceles triangle. According to claim 1,
Radial dust collection needles (600) for electric dust collection, characterized in that the base angle (G1) of the first triangular discharge portion (610) is formed larger than the base angle (G2) of the second triangular discharge portion (630). In the radial dust collection needles 600a for electric dust collection provided inside the dust collection tube 320 of the electric precipitator 1 and assisting in generating discharge through the application of electricity,
The first triangular discharge portion 610a having a triangular shape is continuously connected to the outer surface in an outward direction,
Radial dust collection needles (600a) for electric dust collection, characterized in that the through hole (620a) is perforated in the center of the inside. According to any one of claims 1 or 4,
Radial dust collection for electric dust collection, characterized in that curved radial projections (611, 611a, 631) formed of a curved surface are formed at the vertices of the first triangular discharge portion (610, 610a) or the second triangular discharge portion (630), respectively. needle 600a.

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