JPH07108191A - Electric dust collector - Google Patents

Abstract

(57) [Summary] [Structure] The application electrode plate E1 of the dust collecting portion E is the upstream end portion E1.
Have three. The upstream end portion E13 is closer to the ionization portion 12 than the dust collecting electrode plate E2 during stacking. As the upstream end E13 of the applying electrode plate E1 extends longer than the dust collecting electrode plate E2 in the stacking, the upstream end E13 has the ionizing portion 12 and the dust collecting electrode plate E2.
It prevents an electric field from being generated between the two. Therefore, the occurrence of sparks is prevented. Thereby, the dust collecting electrode plate E2 can be brought as close to the ionization section 12 as possible. It is possible to reduce the size of the device by setting the dimension L in the air flow direction to be short.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator, and more particularly, to an electrostatic precipitator having a large number of alternately stacked dust collectors.

[0002]

2. Description of the Related Art Generally, an electrostatic precipitator of this type is provided with an ionization section arranged in a path of air to be cleaned and a dust collection section arranged downstream of the ionization section. The ionization unit charges the dust contained in the air to be cleaned to one polarity (for example, positive polarity) in advance, and collects the dust charged by the dust collection unit (for example, a special feature). See Kaihei 1-310753).

The ionization section is provided with an ionization line to which a high voltage of one polarity (for example, 5 KV) is applied, and a ground-side counter electrode plate facing the ionization line. On the other hand, the dust collecting portion has an applying electrode plate and a dust collecting electrode plate. The two electrode plates are alternately laminated with an interval allowing air to flow therethrough, and are arranged downstream of the ionization section in the air path of the electrostatic precipitator.

In order to prevent arc discharge and the like, the applied electrode plate is formed by coating a conductive member made of aluminum foil or the like with a covering member made of resin or the like. The dust collecting electrode plate has a bare conductive member in order to release the charged electric charge. Then, an electric field is generated by applying a high voltage of, for example, about 3 KV to the conductive member of the applying electrode plate, and the dust ionized by the Coulomb force is collected by the collecting electrode plate.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the electrode applied to the ionization line and the electrode applied to the dust collecting electrode plate are different from each other, there is a problem that an electric field is generated between them and a spark is easily generated. Particularly, as disclosed in Japanese Patent Laid-Open No. 1-310753, when the upstream end of the dust collecting electrode plate in the air flow direction is closer to the ionization line than the applying electrode plate, this tendency becomes more remarkable.

Therefore, conventionally, it was necessary to sufficiently widen the gap between the ionization wire and the dust collecting electrode plate in the air flow direction to prevent sparks, and therefore the overall size of the device in the air flow direction becomes long, and the device becomes large. Had the problem of becoming larger. Further, as the use is continued, the potential of the surface of the insulating layer of the applied electrode plate is lowered, the electric field generated between both electrode plates is weakened, and the dust collecting ability is also deteriorated.

An object of the present invention is to solve the above problems.

[0008]

In order to solve the above-mentioned problems, the structure according to claim 1 has an ionization section arranged in a flow path of air to be cleaned and a downstream side of the ionization section. There is provided an applied electrode plate including a conductive member that is electrically connected to the electrode on the application side and a dust collecting electrode plate that includes a conductive member that is electrically connected to the electrode on the ground side, and both electrode plates are spacers. In the electrostatic precipitator having a dust collecting portion that is alternately laminated with a space allowing air to flow through the means, the applying electrode plate is closer to the ionizing portion than the dust collecting electrode plate when laminated. It is characterized by having an upstream end portion that

Further, in claim 2, the conductive member of the applying electrode plate is entirely covered with a covering member having an insulating property. Further, in claim 3, the covering member is covered with the semiconductor layer in a state where a portion in contact with the spacer means is opened.

[0010]

According to the structure of the present invention, since the upstream end portion of the applying electrode plate is closer to the ionizing portion than the dust collecting electrode plate at the time of stacking, the upstream end portion is combined with the ionizing portion. It prevents an electric field from being generated between the dust electrode plate and the dust electrode plate, and prevents sparks from being generated. Further, in the configuration according to claim 2, since the upstream end portion is closer to the ionization portion than the dust collecting electrode plate, the upstream end portion has the same polarity as the conductive member of the applying electrode plate due to the ionization portion. As a result, the potential of the surface of the covering member is prevented from decreasing.

Further, according to the third aspect of the present invention, the charge of the upstream end portion by the ionization portion is promoted by the semiconductor layer from the upstream side to the downstream side in the air flow direction, so that the electrode on the ground side is more surely charged. Will be stopped.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing a main part of an electrostatic precipitator according to an embodiment of the present invention,
FIG. 2 is a schematic perspective view showing a main part of the application electrode plate of the electrostatic precipitator. Referring to FIG. 1, the dust collecting element 1
No. 0 is provided with a casing (not shown) that divides the air passage PH inside, and in the casing (not shown), an ionization section 12 and a dust collecting section E disposed on the downstream side of the ionization section 12 are provided. Is equipped with.

The ionization section 12 is stretched near the air inlet of the casing, and an ionization line 12a to which a high voltage of positive polarity (5 KV in this embodiment) is applied.
And a ground-side counter electrode plate 12b facing the ionization line 12a in a direction orthogonal to the air path PH. On the other hand, the dust collecting section E includes an application electrode plate E1 and a dust collecting electrode plate E2 that are alternately stacked with an interval allowing air to flow between them. Furthermore, both electrode plates E
1, E2 by dowel E3 as spacer means,
A constant distance between them is maintained. Dowel E3 is
For example, it is fixed to the dust collecting electrode plate E2.

The applying electrode plate E1 is composed of an ionizing wire 12a.
It includes a conductive member E11 to which a high voltage (3 KV in this embodiment) having the same polarity as that of and a covering member E12 that covers the conductive member E11 are included. More specifically, the voltage application electrode plate E1 of the present embodiment is obtained by printing a conductive resin on a sheet material made of, for example, polyethylene terephthalate, and laminating a polyethylene terephthalate sheet material thereon. This is a so-called mold type electrode plate, and the conductive resin constitutes the conductive member E11, and the polyethylene terephthalate sheet material constitutes the covering member E12.

Here, in the present embodiment, the covering member E1
2 is covered with the semiconductor layer E14 in a state in which the portion in contact with the dowel E3 is open, as well shown in FIG. The semiconductor layer E14 is embodied by, for example, a semiconductor coating, and the surface resistance thereof is set to, for example, about 10 ⁶ Ω to about 10 ¹² Ω.

Returning to FIG. 1, the dust collecting electrode plate E2 includes a bare conductive member E21 exposed to the outside and connected to an electrode on the ground side. Dust collecting electrode plate E of this embodiment
2 is embodied by a stainless plate having a thickness of 50 μm, for example. Then, the application electrode plate E1 in the present embodiment
Has an upstream end E13 adjacent to the ionization section 12 in the stacking shown in FIG. As a result, the upstream end portion E13 and the ionization line 12 are separated from the upstream end portion of the dust collecting electrode plate E2.
It enters between a and and prevents both from facing each other.

According to the above structure, since the upstream end E13 of the applying electrode plate E1 extends longer than the dust collecting electrode plate E2 in the stacking, the upstream end E13 is the ionization line 12a of the ionizing section 12. An electric field is prevented from being generated between the dust collecting electrode plate E2 and the dust collecting electrode plate E2, and a spark is prevented from being generated. More specifically, when the upstream end E13 does not exist, the plus 5 applied to the ionization line 12a is used.
An electric field due to a high voltage of KV is generated between the ionization wire 12a and the dust collecting electrode plate E2. However, in this embodiment, the upstream end E13 of the applied electrode plate E1 to which a high voltage of plus 3 KV is applied protrudes between the ionization line 12a and the dust collection electrode plate E2, so that the ionization line 12a is The voltage applied between the dust collecting electrode plate E2 and the dust collecting electrode plate E2 drops to 5KV-3KV = 2KV.

As a result, as shown in FIG. 1, the dimension L in the air flow direction between the upstream end portion E23 of the dust collecting electrode plate E2 and the ionization wire 12a is determined by the facing distance H between the ionization wire 12a and the counter electrode plate 12b. Spark will not occur even if it is set shorter. As described above, according to the present embodiment, the dust collecting electrode plate E2 can be brought as close as possible to the ionization section 12, so that the dimension L in the air flow direction can be set to be short and the size of the apparatus can be reduced. Of.

Further, in the structure of this embodiment, the upstream end E13 is closer to the ionization line 12a of the ionization section 12 than the dust collecting electrode plate E2.
Is the same polarity as the conductive member E11 due to the ionization line 12a of the ionization section 12 (positive polarity in this embodiment).
As a result, the potential of the surface of the covering member E12 is prevented from decreasing. Therefore, in the present embodiment, there is no fear that the electric field generated between the application electrode plate E1 and the dust collecting electrode plate E2 is deteriorated, and it is possible to prevent deterioration of the dust collecting performance.

Further, in the configuration of this embodiment, the ionization section 1
The charge of the upstream end E13 by the ionization line 12a of No. 2 is
Since the semiconductor layer E14 promotes from the upstream side to the downstream side in the air flow direction, it is possible to more reliably prevent the electrode on the ground side from being charged, and to prevent the electric field between the applying electrode plate E1 and the collecting electrode plate E2 from deteriorating. It has the advantage of being prevented. On the other hand, the semiconductor layer E14 is open at a portion of the covering member E12 that is in contact with the dowel E3 for maintaining the distance from the dust collecting electrode plate E2, so that creeping discharge or the like is prevented from occurring at the dowel E3. be able to.

The above-described embodiment is merely an example of a preferred embodiment of the present invention, and, for example, the ionization line 1
2a and the application electrode plate E1 are applied with a high voltage of negative polarity, and the dust collecting electrode plate E2 is electrically connected to the electrode of positive polarity. For example, the gist of the present invention is not changed. It goes without saying that various design changes are possible within the range.

[0022]

According to the first aspect of the invention, the upstream end prevents an electric field from being generated between the ionization section and the dust collecting electrode plate,
Since the generation of sparks is prevented, the dust collection electrode plate can be brought as close as possible to the ionization section, and the size in the air flow direction can be set short to achieve the remarkable effect of downsizing the device. Play.

Further, in the structure according to the second aspect, the upstream end portion has the same polarity as the conductive member due to the ionization portion, and as a result, the surface of the covering member has a different polarity from the conductive member. Since it is prevented, there is no fear that the electric field generated between the applying electrode plate and the dust collecting electrode plate is deteriorated, and there is an advantage that the dust collecting performance can be prevented from lowering.

According to the third aspect of the present invention, the movement of the charge at the upstream end portion by the ionization portion is promoted by the semiconductor layer from the upstream side to the downstream side in the air flow direction. There is an advantage that deterioration of the electric field between the dust collecting electrode plate and the dust collecting electrode plate is prevented. On the other hand, since the semiconductor layer opens the portion of the covering member that comes into contact with the spacer means for maintaining the distance from the dust collecting electrode plate, it is possible to prevent a creeping discharge or the like from occurring in the spacer means. .

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a main part of an electrostatic precipitator according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a main part of an application electrode plate of the electrostatic precipitator.

[Explanation of symbols]

 12 Ionizing part E Dust collecting part E1 Applying electrode plate E11 Conductive member E12 Covering member E13 Upstream end E14 Semiconductor layer E2 Dust collecting electrode plate E21 Conductive member E3 Dowel (spacer means)

Claims (3)

[Claims] 1. An ionization section (12) arranged in a flow path of air to be cleaned, and an ionization section (12) arranged downstream of the ionization section (12) and electrically connected to an electrode on the application side. Both electrode plates (E1, E2) have an applied electrode plate (E1) including a conductive member (E11) and a dust collecting electrode plate (E2) including a conductive member (E21) that is electrically connected to the ground side electrode. Is an electrostatic precipitator provided with a dust collecting part (E) which is alternately laminated with an interval allowing air to flow through the spacer means (E3), wherein the applying electrode plate (E1) is laminated. 2. An electrostatic precipitator having an upstream end (E13) closer to the ionization part (12) than the dust collecting electrode plate (E2). 2. A conductive member (E1) of the applying electrode plate (E1).
The electrostatic precipitator according to claim 1, wherein 1) is entirely covered with a covering member (E12) having an insulating property. 3. The electrostatic precipitator according to claim 2, wherein the covering member (E12) is covered with a semiconductor layer (E14) in a state where a portion in contact with the spacer means (E3) is opened.