JPH04126558A - Electrode of dust collector and production thereof - Google Patents

Abstract

PURPOSE:To reduce increase of air-permeation resistance and to make deterioration of dust collecting efficiency small by burying a metallic sheet into the insulated material to form a counter electrode for dust collection and joining a corrugated metallic spacer having width necessary to maintain the interval of a pole plate at a time of winding to both faces of one part in the width direction of a metallic plate to form an electrode for dust collection. CONSTITUTION:A counter electrode 4 for dust collection is formed by burying a metallic sheet 401 into this insulated material 402. A resin such as polypropylene is preferably utilized for the insulated material 402. The foilike thin material may be utilized for the metallic sheet 401 and various substances are applied to this material. An electrode 3 for dust collection is formed by joining spacers 302A, 302B, 302G and 302D to the metallic plate 301. The electrode 3 for dust collection has width broader than the counter electrode 1, for dust collection. The spacers 302C, 302D of one side are joined to both faces of the end part in the width direction. Further the spacers 302A, 302B of the other side are joined to the position which is near to the central part from the end part of the other width and equal to the width of the counter electrode 4 for dust collection. Stainless steel is preferably utilized for the metallic plate 301 of the electrode for dust collection and the spacers 302. Further when the positions of the spacers are regulated so that these spacers pinch the metallic plate 301 to synmmetrize the surface and the rear and both the spacers of the surface and the rear and the metallic plate are spot-welded in three-ply superposition, the electrode of a dust collector is produced at high efficiency. Thereby reliability of insulation is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrode for an electrostatic dust collector having an ionization section and a dust collection section.

[Conventional technology]

A dust collector having an ionization section and a dust collection section is used in an air purifier, etc., and FIG. 2 is a conceptual diagram showing its configuration. The ionization section consists of a discharge electrode 1 made of a wire or the like and a discharge counter electrode 2 made of a wire mesh, between which a corona discharge A is generated.
make them do On the other hand, the dust collection section has a large number of dust collection electrodes 3 and dust collection counter electrodes 4.
The most common structure is that the ends of metal flat plates are supported by insulators and stacked at intervals, and a dust collection electrode plate and a dust collection counter electrode plate are respectively stacked. It has a structure in which they are electrically connected together. and 77n5
Dust collection is performed by ventilation B and C.

By the way, in recent years, in order to increase efficiency and reduce manufacturing costs by narrowing the spacing between the electrode plates of dust collecting electrodes, Japanese Patent Laid-Open No. 1-2
As seen in Japanese Patent No. 10049 and Japanese Unexamined Patent Publication No. 1-304062, a belt-shaped dust collecting electrode plate and a dust collecting counter electrode plate are overlapped and wound together. As shown in FIG. 3, the dust collection counter electrode 4 and the dust collection electrode 3 are wound with a spacer (not shown) interposed therebetween for maintaining insulation and spacing.

[Problems to be solved by the invention]

As a means for maintaining the distance between electrode plates in a method in which a dust collection electrode and a dust collection counter electrode are wound in an overlapping manner, the above-mentioned Japanese Patent Application Laid-Open No. 1-210
As shown in Japanese Patent No. 049 and Japanese Unexamined Patent Publication No. 1-304062, there is a method in which an insulating sheet having wavy or dotted protrusions is interposed. However, there are problems in that an insulating sheet with sufficient strength becomes thick and has poor ventilation resistance, and molding protrusions on the insulating material becomes expensive.

[Means to solve the problem]

The present invention provides an electrode for a dust collector having an ionization part and a dust collection part, in which a dust collection electrode and a dust collection counter electrode are wound in an overlapping manner, in which the dust collection counter electrode has a metal plate in an insulating material. The dust collection electrode is an electrode of a dust collection device in which metal wavy spacers having a width necessary to maintain the electrode plate spacing during winding are bonded to both sides of a portion of a widthwise portion of a flat metal plate.

Further, the dust collection electrode may be wider than the dust collection counter electrode, and the spacer may be joined to the width end of the dust collection pole and closer to the center than the other width end.

Alternatively, only an insulating material may be present in the width portion of the dust collection counter electrode that faces the spacer.

The method for manufacturing the dust collecting electrode is characterized in that the spacer of the dust collecting electrode is positioned symmetrically between the front and back of the metal flat plate, and is spot welded to the metal flat plate in three stacks at the wavy valley portions of the spacer.

[Effect]

Since the dust collection counter electrode is insulated over its entire surface, short circuits can be prevented even if the dust collection electrode and a metal spacer of the same potential come into contact with each other, thereby making it possible to narrow the gap between the electrode plates and increase dust collection efficiency. Since the metal plate is embedded in the insulating material and there are no exposed parts, it is possible to prevent chemical solution from penetrating and corroding when cleaning the dust collection section.

Since the dust collection electrode has a spacer bonded to only a portion of the metal flat plate in the width direction, dust collection efficiency can be increased and ventilation resistance can be reduced. That is, although an effective electric field is not generated in the portion where the wavy dust collection electrode contacts the dust collection counter electrode and the dust collection ability is poor, the width of this portion can be minimized.

In addition, since the wavy spacer is hard to be crushed by being bonded to a flat metal plate, it may be thinner.
There is little increase in ventilation resistance. Moreover, this also allows the width of the spacer to be reduced, and the above-mentioned drop in dust collection efficiency can also be reduced.

Furthermore, if the dust collection electrode is made wider than the dust collection counter electrode, and a spacer is connected at one width end and closer to the center than the other width end, the dust collection electrode protruding from the dust collection counter electrode can also serve as a discharge counter electrode. can be done. That is, by arranging the protruding side of the dust collection electrode 3 on the ionization electrode 1 side as shown in FIG. 4, it is possible to generate a discharge λ and also function as a discharge counter electrode. Thereby, insulation deterioration of the dust collection counter electrode due to discharge between the dust collection counter electrode 4 and the ionization electrode 1 can be prevented, and the discharge counter electrode 2 can be omitted in some cases.

In addition, since the spacer is located inside the wound dust collection part, there is less turbulence caused by sudden changes in ventilation resistance (good ventilation).

In addition, if there is only insulating material in the width part of the dust collection counter electrode that faces the spacer, that is, if there is no metal plate embedded in this part, the metal plate of the dust collection counter electrode will sandwich the insulating material. It does not directly face the spacer. Therefore, there is no fear of deterioration of the insulating material, and the thickness of the insulating material can be reduced.

Furthermore, if the position of the spacer of the dust collecting electrode is made symmetrical between the front and back with the flat metal plate in between, the wavy valley portions of the spacer, that is, the parts that contact the flat metal plate, will be the same on the front and back. Highly efficient manufacturing can be achieved by sequentially spot-welding the spacer and three flat metal plates in this area.

〔Example〕

FIG. 1 is a diagram showing the state of the dust collecting electrode and the dust collecting counter electrode of the present invention before each cycle. The dust collecting counter electrode 4 has a metal plate 4 inside an insulating material 402.
01 is embedded. As the insulating material 402, a resin such as polypropylene, which has good insulation properties and can withstand cleaning chemicals, is suitable. The metal plate 401 may be a thin foil-like one, and various materials may be used. The manufacturing method used includes sandwiching a metal plate between sheets of insulating material and welding them together by heating.

The dust collecting electrode 3 has spacers 302A and 302 on a metal flat plate 301.
B, 302C1302D is joined. In this embodiment, the dust collection electrode 3 is wider than the dust collection counter electrode 4, and the negative spacer 302C1302D is joined to both sides of the widthwise end. Also, the other spacers 302A and 302B are the other 41! It is joined at a position commensurate with the width of the dust collection counter electrode 40, closer to the center than the ends.

The material for the metal flat plate 301 and spacer 302 of the dust collection electrode is preferably a material with good corrosion resistance and high tensile strength and elastic limit in order to make it thin, and stainless steel is preferable.

The width of the spacer may be the maximum JJJ% necessary for strength in order to maintain the distance between the electrode plates without being crushed during winding. For example, when the thickness of the spacer is 30 μm, the width may be 4 mm. Furthermore, the wavy shape of the spacer may be a triangular wave, a sine wave, a trapezoid, or the like.

Also, the position of the spacer is as shown in FIG.
01 so that the front and back sides are symmetrical, and spot welding the front and back spacers and three flat metal plates at the wavy valley portion 303 allows for highly efficient manufacturing. Note that other welding methods, such as plasma welding, can also be applied.

FIG. 5 is a diagram showing another embodiment of the present invention, in which the dust collection counter electrode 4 and the dust collection electrode 3 have the same width. Spacer 302A, 30
2B, 302C, and 302D are joined to both sides of the metal flat plate 3010 at both ends in the width direction. FIG. 5 also shows an embodiment in which only an insulating material is present in the width portion of the dust collection counter electrode that faces the spacer. Spacer 302A
, 302B, 302C, and 302D all have the same width d, the width of the part where only the insulating material of the dust collection counter electrode exists is d.
The larger the better.

For example, a difference between D and d of about 1 tonomi is sufficient. In addition,
In the case of FIG. 1 as well, it goes without saying that the portion of the dust collection counter electrode facing the spacer is made only of insulating material.

FIG. 6 shows another embodiment of the present invention in which when the width of the dust collecting electrode 3 is narrow, spacers 302A and 302B may be provided with one strip each on the front and back sides at the center of the width. In addition, in the case of FIG. 5, the spacer is a metal flat plate 30.
It may be joined at a position a little closer to the center than the edge of the ring drawing 1. In this case, there is an advantage that turbulence caused by sudden changes in ventilation resistance is reduced and ventilation is improved. Furthermore, if the width of the dust collecting electrode is particularly large, three or more spacers can be provided on each side.

〔Effect of the invention〕

In the present invention, since a thin corrugated metal plate with a relatively narrow width is used as a spacer between the dust collection electrode and the dust collection counter electrode, the dust collection efficiency is high and the ventilation resistance is low.

Furthermore, the spacer can be easily joined to the flat metal plate of the dust collecting electrode by welding, and the advantage that the winding type dust collecting part can be produced at low cost is not impaired. Furthermore, by making the dust collection electrode wider than the dust collection counter electrode, it can also function as a discharge counter electrode, and insulation deterioration of the dust collection counter electrode can be prevented. Furthermore, by making only the insulating material of the width portion of the dust-collecting counter electrode that faces the spacer, it is possible to improve the reliability of the insulation.

[Brief explanation of drawings]

Figures 1, 5, and 6 are diagrams showing the electrode structure of the dust collector on each side of the present invention, Figure 2 is a diagram showing the principle of the dust collector, and Figure 3 is a winding type collection. Diagram showing the structure of the dust part, No. 4
The figure is a diagram showing the operating principle of an electrode according to an example of the present invention. 1... Discharge electrode 2... Discharge counter electrode 3... Dust collection electrode 4... Dust collection counter electrode 301... Metal flat plate 302A
, 302B.

Claims (1)

[Claims] 1. An electrode for a dust collector having an ionization part and a dust collection part, in which a dust collection electrode and a dust collection counter electrode are wound in an overlapping manner, wherein the dust collection counter electrode is made of an insulating material. A metal plate is embedded in the dust collecting electrode, and the dust collecting electrode is made by joining a metal wavy spacer of a width necessary to maintain the electrode plate spacing when wound on both sides of a part of the flat metal plate in the width direction. An electrode for a dust collector characterized by: 2. The dust collection electrode is wider than the dust collection counter electrode, and the spacer is joined to the width end of the dust collection pole and closer to the center than the other width end. Dust collector electrode. 3. The electrode for a dust collector according to claim 1 or 2, wherein only an insulating material is present in the width portion of the dust collection counter electrode that faces the spacer. 4. The collection according to claim 1 or 2, characterized in that the spacer of the dust collecting electrode is positioned symmetrically between the front and back of the metal flat plate, and is spot welded to the metal flat plate in three layers at the wavy valley portion of the spacer. How to make dust poles.