JPH0418944A - Electrostatic precipitator - Google Patents

Abstract

PURPOSE:To restrain the amount of ozone generation by constituting a discharge electrode of the board body of conductive thin plate covered with insulating body on its plate surfaces, disposing the board body so that the board surface is orthogonal to the direction of air flow, and confronting the end surface of conductive thin plate to counter electrode. CONSTITUTION:Corona discharge is generated between the discharge electrodes 1 and counter electrodes 2, and the dust in the air is charged by the corona discharge. The discharge electrode 1 is constituted of the board body of the conductive thin plate 3 covered with the insulating bodies 4 on its plate surfaces. The board body is so disposed that the board surface is orthogonal to the direction of air flow, and the end surfaces 3a of the conductive thin plate 3 are confronted to the counter electrodes 2. As a result, the amount of ozone generation is restrained to the utmost, and the maintenance, such as the washing of electrode, is easy, and the safety is sharply enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electrostatic precipitator, and particularly to improvements in the electrode portion thereof.

(Prior art) Electrostatic precipitators have a charging function that generates corona discharge between a discharge electrode and a counter electrode, and charges dust in the air with the corona discharge. It has two functions: a dust collection function to collect dust. Among these, the discharge electrode of the charging section is made of a needle-like electrode, a thin metal wire stretched by a spring body, or the like, in order to improve the discharge performance. Among these picture electrodes, the needle-shaped electrode has problems in that it generates a large amount of ozone due to concentrated discharge, and is easily deteriorated due to wear, evaporation, and the like. For this reason, the mainstream electric precipitators for home use are wire-type ones that use a thin metal wire stretched by a spring body or the like as a discharge electrode.

FIG. 5 shows a charging section in a conventional electrostatic precipitator using such a wire method.

An electrostatic precipitator is provided with a charging section on the upstream side of the flow of air to be purified, and a dust collecting section (not shown) on the downstream side. The charging section is equipped with a discharge electrode 1 made of a single metal wire using, for example, tungsten wire, and a counter electrode 12. The thin metal wire of the discharge mff1i pole 11 has an extremely thin wire diameter and is tensioned by a spring body or the like in order to obtain high discharge performance. And in this example,
A high (+) voltage is applied to the discharge electrode 11 to generate a corrode discharge, and dust in the air is charged. on the other hand,
The dust collecting section (not shown) is configured with, for example, a dust collecting electrode and a counter electrode that are arranged to face each other at an appropriate interval. and,
A voltage lower than the high voltage applied to the discharge electrode 11 is applied between these two electrodes, so that dust charged in the charging section is collected.

As mentioned above, an electric precipitator collects dust in the air, so each electrode in the charging part and dust collecting part should be cleaned at appropriate intervals of use to restore dust collection efficiency. is needed.

(Problem to be solved by the invention) In order to improve discharge performance and minimize the amount of ozone generated, conventional electrostatic precipitators have adopted a wire method using a thin metal wire stretched by a spring body etc. as a discharge electrode. things have become mainstream.

However, the wire type electrostatic precipitator has the following problems because it uses a thin metal wire with an extremely small diameter stretched by a spring body or the like as a discharge electrode. That is, (1) there is a risk that the fine metal wire may be cut during manufacturing, transportation, maintenance such as electrode cleaning, etc., and great care must be taken in handling. ■In order to maintain a constant distance between the thin metal wire, which is the discharge electrode, and the counter electrode, a constant tension must be applied to the thin metal wire at all times. As a result, there is a risk that the thin metal wire may break due to long-term use, and if breakage occurs, there is a risk of an accident due to contact with the counter electrode. ■Even during manufacturing, it was necessary to manage the tension of the thin metal wire, leading to high manufacturing costs. ■In order to prevent accidents due to contact with the electrode part from the outside, it is necessary to install an insulator guard to prevent the thin metal wire from being exposed in the opening, but since the thin metal wire and the insulator guard cannot be integrated,
It was configured as a separate part. For this reason, the charging portion had to be thicker to some extent.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a thin electrostatic precipitator that can suppress the amount of ozone generated as much as possible, is easy to maintain such as electrode cleaning, is highly safe, and is thin.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention generates corona discharge between a discharge electrode and a counter electrode, and charges dust in the air with this corona discharge. The electric precipitator is an electric precipitator that collects dust by moving the discharge electrode, and the discharge electrode is composed of a plate-like body in which the plate surface of a conductive thin plate is coated with an insulator, and the plate surface of the plate-like body is arranged perpendicularly to the air flow direction. The basic gist is that the conductive thin plate is arranged so that the end face of the conductive thin plate faces the counter electrode.

Furthermore, in order to better achieve the above object, it is preferable that the present invention has the following second configuration.

That is, secondly, in the above basic configuration, the opposite electrode is
It is constructed so as to be located on the same plane as the conductive thin plate serving as the discharge electrode on the same guard insulator.

(Function) With the configuration described in the above, there are no protrusions on the surface of the discharge rls electrode where concentrated discharge occurs, and the amount of ozone generation is suppressed to the utmost. Further, since the discharge electrode is formed of a conductive thin plate whose plate surface is coated with an insulator, accidents caused by contact with the discharge electrode from the outside are prevented, and there is almost no risk of cutting or the like.

As a result, safety is improved and maintenance such as electrode cleaning becomes easier.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 and FIG. 2 are diagrams showing an embodiment of the present invention.

First, to explain the configuration of an electrostatic precipitator, a charging section equipped with a discharge electrode 1 and a counter electrode 2 is provided on the upstream side of the flow of air to be purified, and a dust collecting section (not shown) is provided on the downstream side. It is provided. And in this example, the free tatti
Pole 1 is configured as follows.

That is, the discharge electrode 1 is a plate-shaped body in which a conductive thin plate 3 made of SUS foil with a thickness of about 20 μm is coated with a guard insulator 4 on both sides, and the plate-shaped body is perpendicular to the direction of air flow. It is set up to do so.

On the other hand, the counter electrode 2 is formed of a SUS plate with a thickness of about 0.5 mm, and is installed parallel to the air flow direction. The end surface 3a of the conductive thin plate of the discharge electrode 1 is opposed to the plate surface of the counter electrode 2 with a required spacing therebetween.

Since the electrostatic precipitator of this embodiment is constructed as described above, a high voltage is applied between the picture electrodes 1.2 with the discharge electrode 1 as the positive electrode and the counter electrode 2 as the negative electrode to generate corona discharge. In this case, since there are no protrusions where concentrated discharge occurs on the end surface 3a of the conductive thin plate serving as the discharge electrode 1, the amount of ozone generated can be suppressed to the utmost. Further, when such a high voltage is applied, since the plate surface of the discharge electrode 1 is covered with the guard insulator 4, accidents caused by contact from the outside are prevented. Furthermore, the discharge electrode 1 is free from the risk of cutting accidents as with thin metal wires. Therefore, there is no risk of cutting during manufacturing, transportation, maintenance (cleaning, etc.), or long-term use, and the handling becomes easy.

In this example, a 20 μm thick SUS foil was used as the conductive thin plate 3. However, if the end face, which is the discharge part, is shaped like a knife, the main body of the conductive thin plate 3 could be made of thicker electrode material. It is also possible. In addition, if the end surface becomes rough during the molding process, there is no problem with making it smooth by etching or plating with gold, etc. Furthermore, if the electrode abrasive is made of a material that does not deteriorate easily due to discharge etc., SUS can be used. It may be something other than that.

Furthermore, when corona discharge occurs, the discharge electrode 1 side is used as the positive electrode, but conversely, the discharge electrode 1 side may be used as the negative electrode.

Next, FIGS. 3 and 4 show another embodiment of the present invention.

In this embodiment, a conductive thin plate 3 serving as a discharge electrode in a charging section and a counter electrode 5 are attached to the same guard insulator 6, and the counter electrode 5 is located on the same surface as the conductive thin plate 3 serving as a discharge electrode 1. It is configured as follows. 6a is a guard insulator for covering the surface of the conductive thin plate 3.

According to the structure of this embodiment, since the counter electrode 5 is arranged in the same direction as the discharge electrode 1, it is possible to - make the charging section extremely thin; Other functions are almost the same as those of the previous embodiment.

In addition, in this example, the discharge electrode 1 and the counter electrode 5 are
As long as they are installed at opposing positions across a space, they may have a shape other than the comb shape shown in FIG. 3.

[Effects of the Invention] As described below, according to the present invention, the discharge electrode is composed of a plate-like body in which the plate surface of a conductive thin plate is coated with an insulator,
Since the plate surface of the plate-like body is arranged perpendicular to the air flow direction and the end surface of the conductive thin plate is made to face the counter electrode, hI! Since there are no protrusions where concentrated discharge occurs in the discharge part of the electrode, the amount of ozone generated can be suppressed to the utmost. In addition, accidents caused by contact with the radiator11 electrode from the outside are prevented, and the risk of cutting is eliminated, so safety can be significantly improved.Furthermore, during maintenance such as manufacturing, transportation, and electrode cleaning, Ease of handling is obtained. Furthermore, since the insulator serving as a guard is integrated with the discharge electrode, the device can be made thinner than the conventional example.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a charging section in one embodiment of an electrostatic precipitator according to the present invention, FIG. 2 is an enlarged sectional view of the circled part in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is an enlarged sectional view of the circled portion in FIG. 3, and FIG. 5 is a configuration diagram of a conventional electrostatic precipitator without showing the charging section. 1: Discharge electrode, 2.5 Counter electrode, 3: Conductive thin plate, 4.6.6a: Gart insulator. Air flow section 2 Figure 3

Claims (1)

[Scope of Claims] An electric precipitator that generates corona discharge between a discharge electrode and a counter electrode, and charges and collects dust in the air with this corona discharge, wherein the discharge electrode is electrically conductive. It is composed of a plate-like body whose plate surface is coated with an insulator, the plate surface of the plate-like body is arranged perpendicular to the air flow direction, and the end face of the conductive thin plate faces the counter electrode. An electric precipitator characterized by: