JPH0380953A - Dust collection electrode and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to a dust collection type t4f of an air cleaner that collects dust by charging it with electricity, and a method for manufacturing the same.

2. Description of the Related Art A conventional dust collection wli will be explained based on the sectional view of FIG.

The first insulating layer 33, the first conductive layer 31, the second insulating layer 34, and the second conductor tW32 are repeatedly laminated in order,
Between the opposing conductor [fi131.32 and other interlayers, υ
A large spatial layer 35 is formed.

The principle by which dust is collected using the above configuration will be explained.

When a high positive voltage is applied to the first conductive layer 31 and the second conductive layer 32 is set to the ground potential, positively charged dust flowing from upstream of the dust collection electrode due to the air flow shown by the arrow,
When passing through the dust collection electrode, it passes between the large second conductive layer 32 and the first insulating layer 31 of the space layer 35, and due to the Coulomb force caused by the electric field, the surface of the conductive layer 32 on the ground voltage side The dust adheres to the surface and is collected.

In FIG. 5, the dashed line indicates the electric field between the electrodes, l.

is the width of the first conductive layer 31, and 12 is the width of the second conductive layer 32. In the dust collection electrode, a positive high voltage is applied to the first conductive layer 31 and the second conductive layer 32 is set to a ground voltage. and the second conductive layer 32 are reliably insulated by the second insulating layer 34. Furthermore, the width/,<width e2 and the first conductive layer 3
The width l of 1 is narrowed to lengthen the insulation distance.

Problems to be Solved by the Invention However, in the conventional configuration, the insulation distance between the conductive layers 31 and 320 is reduced due to dust and dirt adhering to the margin of the insulating layer 34 between the conductive layers 31 and 32 over time. 1. There was a problem that discharge and tracking occurred. 1b, even with the dust collecting electrode of this structure, insulation deterioration cannot be avoided, and since it adheres to the surface of the safety circuit conductive layer 32 that stops high voltage supply when discharge occurs, the width of the second conductive layer 32 l is the first insulating layer 33 and the second insulating layer 3
Although the width of the first conductive layer 31 is made as wide as possible without exceeding the width of 4 to increase the dust collection efficiency, it was necessary to make the middle 11 of the first conductive layer 31 narrow in order to secure an insulation distance. For this reason, there is a problem that the electric field on both sides of the second conductive M32 becomes weaker than the internal one, the Coulomb force is small, and the dust collection rate is reduced accordingly.

Furthermore, when the positively charged dust that has flowed in from upstream of the dust collection electrode passes through the dust collection electrode, it adheres to the surface of the second conductive layer 320 on the ground voltage side due to the Coulomb force caused by the electric field and is collected. Although it should not adhere to the surface of the first insulating layer 33, there is some weakly negatively charged dust even among the positively charged dust, and this will not adhere to the first insulating layer 33. Since electrical neutralization is not possible, a phenomenon occurs in which the first insulating layer 33 becomes negatively charged. The positively charged charge on the surface of the first insulating layer 330 is directed in a direction that alleviates the electric field in the space layer between the first conductive layer 31 and the first insulating layer 33 to which a positive high voltage is applied. There was a problem in that the Coulomb force was weakened and the dust collection rate was reduced.

The present invention solves the above problems, and aims to provide a dust collection chamber ff which prevents discharge tracking occurring between conductive layers and further improves dust collection efficiency, and a method for manufacturing the same. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the dust collection electrode of the present invention has a first conductive layer and a second conductive layer placed one on top of the other at a constant interval, and at least one of the conductive layers The periphery of the layer is covered with an insulating layer.

In a second invention, the insulating layer of the first invention is formed of a film having a volume resistivity of 108 to 1015 g.

Furthermore, a third invention is the first invention of the first and second inventions above.
at least one of the conductive layer and the second conductive layer.
A conductive deodorizing material is used in li2.

Fourth and fifth inventions are the manufacturing methods of the first invention, and the fourth invention is a manufacturing method in which a first conductive layer whose periphery is covered with an insulating layer and a second conductive layer are separated at a constant interval. A fifth invention, which comprises a set of structures arranged one on top of the other in sequence, and which is formed by winding the structures, is formed by folding the set of structures in a spiral manner. .

Effect: According to the first aspect of the invention, by covering at least one of the conductive layers with an insulating layer, the insulation between the conductive layers is maintained even if dust, dirt, etc. adhere to the margin of the insulating layer over time. will not be damaged. Therefore, there is no need for a safety circuit against discharge, and a dust collecting N pole without insulation deterioration can be obtained for a long period of time. Furthermore, the width of the conductive layer, which was limited to ensure the insulation distance, can be increased. , the dust collection rate is also increased.

In addition, the problem that the surface of the insulating layer is negatively charged and the dust collection rate is reduced as in the structure of the second invention is also solved because the volume resistivity of 108 to 1015 is lower than that of the conventional structure. By using the Q-α film, the surface of the insulating layer can be neutralized, and the drop in dust collection rate with the passage of time is extremely small.

Furthermore, according to the configuration of the third invention, by using a conductive deodorizing material in the conductive FitM, a deodorizing effect is added in addition to the dust collecting effect.

In addition, the winding type manufacturing method of the fourth invention simplifies the manufacturing method compared to the laminating type in which the insulating layer and the conductive layer are laminated layer by layer and the conductive parts are connected. Connections only need to be made in two places.

Further, by using the winding type manufacturing method of the fifth invention, the effective area of the dust collection part is wider than that of the winding type, and the conductive part can be connected only at two places.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a dust collecting electrode showing one embodiment of the present invention.

a first insulating layer 3, a first conductive layer 1, a second insulating layer 4
And the second guide YI! , layers 2 are arranged one on top of the other in order, and the opposing conductive layers 1
．． A space layer 5 larger than the other layers is formed between the two layers, and the first insulating layer 3 and the second insulating layer N4 cover and seal the first conductive layer 1 to form a laminate structure. .

The method for manufacturing this dust collecting electrode includes a laminated method in which conductive layers 1 and 2 and insulating layer 3.4 are stacked one layer on top of the other, and a stacked method in which conductive layers 1 and 2 and insulating layer 3.4 are stacked on top of each other. There is a winding method, in which a set of structures is formed and the structure is wound, and a winding method, in which the above-mentioned structures are folded in a serpentine manner. −
In the case of a laminated type in which layers are stacked one on top of the other, the area of the dust collecting electrode is larger than in other methods, but the structure from which the contacts are taken out becomes more complicated. In the case of a winding type, there are only two contact points and the structure is simple, just winding the electrode. However, the effective area becomes smaller due to the winding. The 9-type zigzag folding type has both the advantages of the laminated type and the winding type, but the manufacturing process is complicated and expensive equipment is required.

Hereinafter, the operation of the dust collection Km of the present invention will be explained.

A positive high voltage is applied to the first conductive layer 1, and the second conductive layer 2
When is the ground voltage, the positively charged dust flowing from upstream of the dust collection electrode in the direction of air flow shown by the arrow is affected by the Coulomb force due to the electric field when it passes through the dust collection electrode, and the second voltage on the earth voltage side It adheres to the surface of the conductive layer 2 and is collected. Also, if negatively charged dust passes from upstream of the precipitator,
By applying a ground voltage to the first conductive layer and a positive high voltage to the second conductive wL layer 2, dust can be collected on the surface of the second conductive layer 2.

In order to form a large space layer 5 between the second conductive layer 2 and the second insulating layer 4, FIG. 2 is a cross-sectional view taken across other parts of the dust collection electrode shown in FIG. A protrusion 6 is formed on. The protrusion 6 may be in the shape of a gutter along the air flow direction.In addition, the second conductive layer 2 may be processed into a wave shape to form the space layer 5, or the first insulating layer may be formed into a wavy shape. 3. It is conceivable that the second insulating layer 4 is formed with a protrusion on each side to form a space layer 5. In short, the great spatial layer 5
It is sufficient if the condition is such that it forms an air flow and poses almost no obstruction to air flow.

In this way, the insulation between the first conductive layer 1 and the second conductive layer @2 is sealed by covering the first conductive layer 1 with the first insulating layer 3 and the second insulating layer 4. Since this ensures reliability, economical insulation deterioration is almost eliminated, and a safety circuit against discharge is not required. As shown in FIG. Even if the width of the first conductive layer 1 is increased, since it is sealed, the insulation distance is small (and the distance between the second conductive layer 2, which is a dust collection plate, is very small).
Since the width can be made as wide as not exceeding the width of M3.4, a dust collection electrode with a high dust collection rate can be realized.

Further, among the positively charged dust flowing from upstream of the dust collection electrode, negatively charged dust, although weak, is transferred to the first insulating layer 3.
Even if the surface is charged, the insulating layer 3 is made of a filament μ of 108 to 1o15jJ-cx, which has a lower volume resistivity than the conventional one.
By using the M1, only a small leakage current flows between the first insulating layer 3 and the first conductive M1, and the surface of the first insulating layer 3 is neutralized over time. Therefore, the electric field in the space between the first conductive layer 1 and the first insulating layer 3 does not weaken over time, and the dust collection rate hardly decreases.

However, since the current flowing between the first conductive layer 1 and the first insulating layer 3 is minute, the film does not generate heat. 10' A-am is the limit of insulation, 1015
t9-Country is the limit for having that effect.

Figure 3 shows the change in the dust collection rate with respect to the elapsed time for the present invention and the conventional example.As can be seen from this result, in the present invention, there is almost no decrease in the dust collection rate even after a long time has passed. unacceptable.

Further, FIG. 4 shows conductive deodorizing material 7 on both sides of the second conductive layer 2.
．． 8 is a cross-sectional view of a dust collecting electrode using a dust collecting electrode, which can further add a deodorizing effect to the dust collecting effect.

In addition, it is also possible to use the conductive deodorizing material itself as a conductive layer.

Effects of the Invention As described above, according to the first invention, at least one conductive layer is surrounded by an insulating layer to ensure insulation between the conductive layers, thereby eliminating insulation deterioration over time and preventing discharge. It is possible to eliminate the need for a safety circuit, and it is also possible to increase the space in the first conductive layer, thereby improving the dust collection rate.

Moreover, according to the second invention, the charges on the surface of the insulating layer can be neutralized, and the dust collection rate can be reduced over time.

Furthermore, according to the third invention, by using a conductive deodorizing material in the conductive layer, it is possible to gust a dust collection electrode that also has a deodorizing effect.

Further, according to the winding type manufacturing method of the fourth invention, the manufacturing method can be simplified compared to the lamination type, and the conductive parts can be connected at two places.

Furthermore, according to the winding manufacturing method of the fifth invention,
Compared to the winding type, the effective area of the dust collection part can be expanded, improving the dust collection rate, and only two conductive parts can be connected.
can be done.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a dust collecting electrode showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of another part of the same dust collecting electrode, and Fig. 3 is a cross-sectional view of the same dust collecting electrode and a conventional dust collecting electrode. A characteristic diagram showing changes in dust collection rate over elapsed time. Figure 4 is a cross-sectional view of a dust collection electrode showing an example of using a conductive deodorizing material in the dust collection electrode. Figure 5 is a conventional dust collection electrode. FIG. 1... First conductive layer, 2... Second conductive layer, 3...
- First insulating layer, 4... Second insulating layer, 5... Space layer, 6... Projection, 7.8... Conductive deodorizing material.

Claims (1)

[Scope of Claims] 1. A dust collection electrode in which a first conductive layer and a second conductive layer are sequentially stacked at a constant interval, and the periphery of at least one of the conductive layers is covered with an insulating layer. 2.The volume resistivity of the insulating layer is 10^8~10^1^5Ω
The dust collection electrode according to claim 1, formed of a film of cm. 3. The dust collecting electrode according to claim 1 or 2, wherein a conductive deodorizing material is used in at least one of the first conductive layer and the second conductive layer. 4. Construct a set of structures in which a first conductive layer whose periphery is covered with an insulating layer and a second conductive layer are stacked one on top of the other at regular intervals, and this structure is wound. A method of manufacturing a dust collecting electrode to be formed. 5. Construct a set of structures in which a first conductive layer whose periphery is covered with an insulating layer and a second conductive layer are stacked one on top of the other at regular intervals, and this structure is folded in a serpentine manner. A method of manufacturing a dust collecting electrode to be formed.