JPH06233946A - Electric dust collecting element - Google Patents

Abstract

PURPOSE:To make an electric dust collecting element have a large size, eliminate arc discharge in a dust collecting part, and improve dust collecting efficiency by installing an auxiliary electrode part in the state where ventilation of air from the dust collecting part is allowed in the downstream side of the dust collecting part and applying high voltage with the same polarity as that of an ionizing wire of an ionizing part to the electrode. CONSTITUTION:An auxiliary electrode 14 is installed in the downstream side of a dust collecting part 12. The auxiliary electrode 14 is set to face the dust collecting part 12 in the state where ventilation of the air out of the dust collecting part 12 is allowed. High voltage with the same polarity as that of an ionizing wire 11a of an ionizing part 11 is applied to the electrode. Consequently, due to the electric field generated by the auxiliary electrode 14, Coulomb force to push dust back to the dust collecting part 12 works on the remaining dust which is going to pass the dust collecting part 12. As a result, the speed of the remaining dust is lowered and the dust is prevented from flowing downward and thus the dust is collected surely in the dust collecting electrode 12b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator element, and more particularly to an electrostatic precipitator element suitable for an electrostatic electrostatic precipitator.

[0002]

2. Description of the Related Art An electrostatic precipitating element of this type comprises an ionization section and a dust collection section arranged downstream of the ionization section in the path of air to be cleaned. As the ionization part, it is general that a large number of opposing electrode plates are formed in a conductive casing of the electrostatic precipitator element, and an ionizing wire to which a high voltage is applied is stretched between the opposing electrode plates.

On the other hand, in the dust collecting section, a large number of application side electrode plates to which a high voltage having the same polarity as that of the ionization line is applied are arranged in a posture parallel to the air flow, and between the application side electrode plates. A dust collecting electrode plate on the ground side is installed in the. Then, the dust contained in the air to be cleaned by the ionization unit is charged in advance to one polarity (for example, positive polarity), and the charged dust is collected in the dust collecting electrode plate of the dust collecting unit. I have to.

[0004]

In order to improve the dust collecting efficiency of the electric dust collecting element in the above structure, the dust collecting area of the dust collecting portion is set to be large, or the distance between the electrode plates of the dust collecting portion is increased. It was necessary to set the voltage to be short or to set the voltage applied to the ionization line and the electrode plate on the application side to be high. However, if the dust collecting area of the dust collecting portion is set to be large, the size of the entire electric dust collecting element becomes large, which is not preferable.

Further, when the distance between the electrode plates of the dust collecting portion is set to be short, the dimensional tolerance is reduced accordingly, so that arc discharge easily occurs due to a slight dimensional error. is there. Further, since the air flow path becomes narrow, the pressure loss of the air flow also becomes large, and the load on the blower means becomes large. Further, even when the voltage applied to the ionization line or the electrode plate on the application side is set high, arc discharge is likely to occur.

The present invention has been made in view of the above problems, and an electric collector capable of improving the dust collecting efficiency without increasing the size of the product, arc discharge in the dust collecting portion, and pressure loss of the air flow. It is intended to provide a dust element.

[0007]

In order to solve the above-mentioned problems, the electrostatic precipitating element of the present invention includes an ionizing wire to which a high voltage of one polarity is applied, in an air path to be cleaned. An ionization part, and an application side electrode plate which is disposed on the downstream side of the ionization part and to which a high voltage of one polarity is applied, and an earth side dust collection electrode plate facing the application side electrode plate. A dust collecting portion that collects dust in the air charged by the ionizing portion on the dust collecting electrode plate by flowing the air between the dust collecting portion and the dust collecting portion, which is arranged on the downstream side of the dust collecting portion And an auxiliary electrode member to which a high voltage having the same polarity as that of the ionization line is applied while facing the dust collecting section.

[0008]

According to the electrostatic precipitating element of the present invention having the above-mentioned structure, when the air to be cleaned flows through the ionization section, the dust contained in the air is charged to one polarity by the ionization section and the dust is collected. Flows into the department. At this time, since the high voltage having the same polarity as the ionized portion, that is, the same polarity as the charged dust is applied to the auxiliary electrode member disposed on the downstream side of the dust collecting portion, the electric field generated from the auxiliary electrode member is applied. As a result, the Coulomb force acts on the residual dust that is about to pass through the dust collecting portion in the direction of being pushed back to the dust collecting portion. As a result,
The remaining dust is reduced in speed and prevented from flowing downstream from the dust collecting portion, and is reliably collected by the dust collecting electrode plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing a schematic configuration of an electrostatic precipitator element according to an embodiment of the present invention. Referring to the figure, this electrostatic precipitator element
A casing (not shown) that divides the path PH of the air to be cleaned, an ionization section 11 arranged in the path PH of the air, and a dust collecting section 12 arranged downstream of the ionization section 11. , And a high voltage supply unit 13 that applies a high voltage to both.

The ionization section 11 is a high voltage supply section 13
Accordingly, a large number of ionization lines 11a to which a high voltage of positive polarity is applied and a plurality of counter electrode plates 11b facing each other across the ionization lines 11a in a direction orthogonal to the path PH of the air (only a part is shown in FIG. ) I have it. The dust collecting part 12
Is for collecting dust in the air charged by the ionization unit 11, and in the present embodiment, the high voltage supply unit 13 applies a high voltage of positive polarity to the application side. A large number of electrode plates 12a and a plurality of ground-side dust collecting electrode plates 12b that oppose the application side electrode plate 12a in a direction orthogonal to the air path PH (only one is shown in FIG. 1) are alternately arranged. Is configured.

The high voltage supply unit 13 has an ionization side high voltage generation unit 13a for applying a high voltage of 5 KV to the ionization unit 11, and a dust collection unit 1 for a high voltage of 2 KV.
2, and a dust collection side high voltage generation unit 13b for applying the voltage to the second electrode. The positive side of the ionization-side high-voltage generator 13a is connected to the ionization line 11a of the ionization unit 11, and the dust-collection-side high-voltage generator 13b is connected to the electrode plate 12a of the dust-collection unit 12.
Are electrically connected to each other.

In the above structure, in this embodiment,
A conductive grid 14 as an auxiliary electrode member is disposed on the downstream side of the air path PH of the dust collecting portion 12 and faces the dust collecting portion 12 while allowing the air to flow therethrough. The conductive grid 14 is composed of a metal net, a net made of a conductive resin, a sheet metal member having a large number of ventilation holes, or the like. The dust collecting side high voltage generation of the high voltage supply unit 13 is performed. It is electrically connected to the portion 13b.

According to the electrostatic precipitating element of the present invention having the above-mentioned structure, each high voltage generating portion 13 of the high voltage supplying portion 13 is provided.
When a predetermined high voltage corresponding to each of a and 13b is applied to the ionization unit 11, the dust collection unit 12, and the conductive grid 14, the air to be cleaned is included in the air when flowing through the ionization unit 11. The dust that is generated is the ionization unit 11
Is charged to a positive polarity by the ionization line 1 of 1, and flows into the dust collecting part 12. Then, in the dust collecting portion 12, a certain amount of dust is collected by the dust collecting electrode plate 12b by the electric field generated in the application side electrode plate 12a. At this time, a high voltage having the same polarity as that of the ionized portion 11, that is, the same polarity as the charged dust is applied by the high voltage generation portion 13 to the conductive grid 14 arranged on the downstream side of the dust collection portion 12. Therefore, due to the electric field generated from the conductive grid 14, the Coulomb force acts on the residual dust that is about to pass through the dust collecting portion 12 in the direction of being pushed back to the dust collecting portion 12. As a result, the speed of the residual dust is reduced and the residual dust is prevented from flowing from the dust collecting portion 12 to the downstream side, and is reliably collected by the dust collecting electrode plate 12b.

Therefore, according to this embodiment, the dust is reliably collected without changing the dust collecting area of the dust collecting portion 12, the distance between the electrode plates 12a and 12b, and the applied voltage. be able to. The present invention is not limited to the above embodiment, and various design changes can be made. For example, as shown in FIG. 2, the ionization side high voltage generator 1 of the high voltage generator 13
By electrically connecting 3a to the conductive grid 14, the same high voltage (5 KV) as that of the ionized wire 11 may be applied to the conductive grid 14.

Further, as shown in FIG. 3, the high voltage generator 1
3 is provided with an n-fold voltage rectifier circuit (not shown) to increase the voltage (for example, 2K
V) can be applied so that the ionization-side high voltage generator 13
Alternatively, a may be electrically connected to the conductive grid 14.
Also in the embodiment of FIGS. 2 and 3, the same effect as that of the embodiment of FIG. 1 can be obtained.

In addition, in the embodiment of FIG. 2, the voltage applied to the conductive grid 14 is higher than the voltage (2 KV) of the electrode plate 13a on the application side of the dust collecting portion 13, so that both Due to the potential difference, it becomes possible to collect dust on the electrode plate 13a on the application side. In addition, it goes without saying that various design changes can be made without changing the gist of the present invention.

[0017]

As described above, according to the electrostatic precipitating element of the present invention, the speed of the dust passing through the dust collecting portion is reduced, and the dust is prevented from flowing downstream from the dust collecting portion. It is possible to reliably collect the dust without changing the dust collecting area of the dust collecting portion, the distance between the electrode plates, and the applied voltage.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a schematic configuration of an electrostatic precipitator element according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a schematic configuration of an electrostatic precipitator element according to another embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a schematic configuration of an electrostatic precipitator element according to still another embodiment of the present invention.

[Explanation of symbols]

 11 Ionization part 11a Ionization wire 12 Dust collection part 12a Application side electrode plate 12b Dust collection electrode plate 13 High voltage generation part 14 Conductive grid (auxiliary electrode member)

Claims (1)

[Claims] 1. An ionization part (11) in the path (PH) of air to be cleaned, including an ionization line (11a) to which a high voltage of one polarity is applied, and a downstream of the ionization part (11). And the earth side dust collecting electrode plate (12b) facing the application side electrode plate (12a) and the application side electrode plate (12a). By injecting the air between the ionization section (11)
The dust collecting part (12) that collects the dust in the air charged by the dust collecting electrode plate (12b), and the state where it is arranged on the downstream side of the dust collecting part (12) and allows the air flow. Face the dust collecting part (12) with the ionization line (1
Auxiliary electrode member (1
4) An electrostatic precipitator element characterized by having and.