JPH01207150A - Dust collecting electrode - Google Patents

Abstract

PURPOSE:To lower the resistance value of conductive layers to a specific value or below and to enhance reliability in a high-voltage contact part by laminating a 1st insulating layer and a 1st conductive layer as well as the 2nd insulating layer and the 2nd conductive layer successively and forming a large space layer in the space between the conductive layer and the layer facing said conductive layer. CONSTITUTION:At least the 1st insulating layer 3 and the 1st conductive layer 1 as well as the 2nd insulating layer 4 and the 2nd conductive layer 2 are successively laminated and the space layer t3 larger than the space between the other layers is formed in the space between the conductive layer of at least either of the 1st conductive layer 1 and the 2nd conductive layer 2 and the layer facing said conductive layer and the resistance value of the conductive layer is confined to <=10OMEGA/cm<2>. As a result, the decrease of the dust collection rate with elapsed time is minimized and the reliability in the high-pressure contact part is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dust collection electrode for an air cleaner that collects dust by charging it.

BACKGROUND OF THE INVENTION FIG. 6 shows a cross-sectional view of a conventional dust collecting electrode. That is, a film in which the first conductive layer 30 is formed on the surface of the first insulating layer 310 and a film in which the first conductive layer 30 is formed on the surface of the second insulating layer 330 are formed.
It had a structure in which the films on which No. 2 was formed were sequentially laminated with a certain space layer between them.

Problems to be Solved by the Invention The principle of collecting dust in the above configuration will be explained.

Arrows indicate the direction of air flow.

When a positive high voltage is applied to the first conductive layer 30.34 and the second conductive layer 32.36 is set to the ground potential, positively charged dust from the front of the dust collection negative electrode passes through the dust collection electrode. When,
Due to the Coulomb force caused by the electric field, the conductive layer 3 on the ground voltage side
2.36 and the surfaces of the second insulating layer 33.37 and are collected. However, the conductive layer 32.3 on the ground voltage side
The positively charged dust adhering to the second insulating layer 33 and 37 is electrically neutralized, but the positively charged dust adhering to the surface of the second insulating layer 33 and 37 cannot be electrically neutralized. Insulating layer 3
A phenomenon occurs in which the surface of 3.37 becomes positively charged. The positively charged surface of the second insulating layer 33.37 is transferred to the first conductive layer 30.37 to which a high positive voltage is applied.
34 and the second insulating layer 33.37, the Coulomb force weakens, and the dust collection rate rapidly decreases over time. Ta.

A similar problem occurs when dust that has been positively charged passes from in front of the dust collecting electrode.

Means for solving the problems and technical means of the present invention for solving the above problems include at least a first insulating layer, a first conductive layer, a second insulating layer, and a second conductive layer. The conductive layer is laminated in sequence, and a space layer larger than that between the other layers is formed between one of the first conductive layer and the second conductive layer and a layer facing the same conductive layer. , the resistance value of the conductive layer is 10Ω or less.

Effect With such a configuration, the charged dust adheres only to the surface of the conductive layer and does not adhere to the surface of the insulating layer, so the electric field in the space layer between the conductive layer and the insulating film does not relax, and over time. This prevents the dust collection rate from dropping suddenly. Further, by regulating the resistance value of the conductive layer, contact from the high voltage lead-out portion can be ensured.

Embodiment FIG. 1 is a sectional view of an embodiment of a dust collection electrode according to the present invention. 1 is a first conductive layer, 2 is a second conductive layer, 3 is a first insulating layer, and 4 is a second insulating layer.

The space tS between the second conductive layer 2 and the second insulating layer 4 is larger than the other interlayers 11 and 12.

Further, the width of the second conductive layer 2 is wider than the width of the first conductive layer 1. FIG. 2 is a sectional view of two stacked layers of the dust collection electrode of the present invention shown in FIG. 1.

In FIG. 2, arrows indicate the direction of air flow. A space layer between the first conductive layer 1 and the first insulating layer 3, a space layer between the first insulating layer 3 and the second conductive layer 2, and a second insulating layer 4
and the first conductive layer 11, a spatial layer between the first conductive layer 11 and the first insulating layer 13, a spatial layer between the first insulating layer 13 and the second conductive layer 12, the above-mentioned Since these spatial layers are extremely small compared to the spatial layer between the second conductive layer 2 and the second insulating layer 4 or the spatial layer between the second conductive layer 12 and the second insulating layer 14, the direction of the arrow Most of the dust-containing air that has flowed into the space layer between the second conductive layer 2 and the second insulating layer 4 and the space layer between the second conductive layer 12 and the second insulating layer 14 pass through.

Now, if a high positive voltage is applied to the first conductive layer 1.11 of the dust collection electrode and the second conductive layer 2.12 is set to ground potential, the positively charged dust from the front of the dust collection electrode will When passing through the dust collecting electrode, the dust is collected by adhering to the surface of the second conductive layer 2° 12 on the ground voltage side due to the Coulomb force caused by the electric field. The positively charged dust adhering to the second conductive layer 2.12 on the ground voltage side is electrically neutralized.

The above description is about positively charged dust from the front of the dust collection electrode, but when negatively charged dust passes from the front of the dust collection electrode, the ground voltage is applied to the first conductive layer 1.11, and the second conductive layer 1. By applying a high positive voltage to layer 2.12, the second
Dust can be collected on the surface of the conductive layer 2.12,
Neutralize electrically. As described above, according to this embodiment, there is another conductive layer between one of the first conductive layer 1.11 and the second conductive layer 2.12 and the insulating layer facing the same conductive layer. By forming a larger space layer between the layers, most of the air passes through the same space layer, and charged dust is removed.
It is attached only to the surface of the conductive layer and not to the surface of the insulating layer, so the electric field in the space between the conductive layer and the insulating layer is not relaxed, and the drop in the dust collection rate is extremely small. .

Note that FIG. 3 is a cross-sectional view of another part of the dust collection electrode shown in FIG. Projection 1
6 is formed. The protrusion 16 may be in the shape of a gutter along the direction of air flow, as long as it forms a large spatial layer and hardly obstructs the flow of air.

FIG. 4 shows the change in dust collection rate with respect to elapsed time for the embodiment of the present invention and the conventional example.

From this result, it was confirmed that in the present invention, there was almost no decrease in dust collection efficiency even after a long period of time had passed.

In addition, in order to set the first conductive layers 1, 11 and the second conductive layer 2゜12 at high voltage or earth voltage, secure connection is made using an external shield or a conductive material such as a phosphor bronze plate. is necessary, and the resistance value of the conductive layer must be taken into consideration. If the resistance value is too high, the portion of the conductive layer in contact with the phosphor bronze plate or the like may become incapable of conducting due to discharge at the contact portion when high voltage is applied. FIG. 6 shows the relationship between the resistance value of the conductive layer and the number of times a high voltage can be applied. As you can see from the figure, the resistance value of the conductive layer is 10ΩZ
If the resistance value is higher than ml, the number of times that high voltage can be applied will decrease rapidly, so the resistance value of the conductive layer should be at least 1
It is necessary to keep 0Q/cI/ as below.

Effects of the Invention The present invention has a structure in which a first insulating layer, a first conductive layer, a second insulating layer, and a second conductive layer are sequentially laminated, and the first conductive layer and the second conductive layer are laminated in sequence. This is a dust collecting electrode that has a larger space between the conductive layer on one side and the insulating layer facing the conductive layer than on other layers, so the dust collection rate does not decrease over time. , and the resistance value of the conductive layer is 10Ω
By using zml, the reliability at the high pressure contact part is also high, and its industrial value is great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a dust collecting electrode showing one embodiment of the present invention. Fig. 2 is a sectional view of a dust collecting electrode showing another embodiment of the present invention, Fig. 3 is a sectional view of another part of the same dust collecting electrode, and Fig. 4 is a sectional view of the same dust collecting electrode and a conventional dust collecting electrode. Figure 6 is a characteristic diagram showing the relationship between the resistance value of the conductive layer and the number of times high voltage can be applied. Figure 6 is a cross-sectional view of a conventional dust collection electrode. be. 1.11...First conductive layer, 2.12...
...Second conductive layer, 3.13...First insulating layer, 4.14...Second insulating layer, 16...
protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
2nd insulating layer Figure 4: 1 height (H) - Figure 5: 1 height with a coining circle □

Claims (1)

[Claims] At least a first insulating layer, a first conductive layer, a second insulating layer, and a second conductive layer are sequentially laminated, and one of the first conductive layer and the second conductive layer A dust collecting electrode in which a space layer larger than that between other layers is formed between a conductive layer and a layer facing the conductive layer, and the resistance value of the conductive layer is set to a value of 10Ω/cm^2 or less.