JPH03118853A - Electrostatic precipitator - Google Patents

Abstract

PURPOSE:To restrain the generation amount of ozone by forming conductive layer on a insulating thin plate, and covering the conductive layer with insulating layer except a linear area of specified width of conductive layer which is used for corona discharge as a discharge electrode. CONSTITUTION:Corona discharge is generated between the discharge electrode 6 and a confronting electrode 7, and the dust in the air is charged by the corona discharge to be collected to a collector electrode 7. In this case, the conductive layer 3 is formed on the insulating base plate 1, and covered with the insulating layer 5 except the linear area of specified width of the conductive layer 3 which is used as the discharge electrode 6. As a result, the generation amount of ozone is remarkably restrained, and the maintenance, such as washing of the electrodes, is easily carried out, and the cost is reduced.

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 its discharge electrode (ionizer electrode).

(Prior art) An electric precipitator has two main functions: an ionizer 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 collector function to collect charged dust.

Among these, the discharge electrode of the ionizer section uses a thin metal wire or needle-shaped electrode in order to improve discharge performance. Among these picture electrodes, needle-shaped electrodes have a problem in that concentrated discharge occurs and a large amount of ozone is generated. This ozone generation is
Not only a needle-shaped electrode but also the presence of a slight protrusion causes concentrated discharge and promotes the generation of ozone. For this reason, wire type electric precipitators using thin metal wires as discharge electrodes are becoming mainstream in household electric precipitators.

FIG. 3 shows a conventional electrostatic precipitator using such a wire system.

This electrostatic precipitator is constructed in two stages, with an ionizer section 10 provided on the upstream side and a collector section 20 provided on the downstream side with respect to the flow of air to be purified. IONA's iser section 10 is equipped with a discharge electrode 11 made of a fine metal wire, such as a tungsten wire, and a counter electrode 12.

In this example, a (+) high voltage is applied to the discharge electrode 11 to generate corona discharge, and dust in the air is charged. On the other hand, in the collector portion 20, a collector electrode 14 and a counter electrode 15, each formed on an insulating strip-shaped thin plate 13, are arranged at appropriate intervals. Picture electrode 1
During the period 4.15, a voltage lower than the high voltage applied to the discharge electrode 11 is applied to collect the charged dust in the ionizer section 10.

Since the electric precipitator collects dust in the air as described above, the electrodes of the ionizer section 10 and the collector section 20 are cleaned every appropriate period of use to restore dust collection efficiency. It has become necessary.

(Problems to be Solved by the Invention) Conventional electrostatic precipitators are mainly of the wire type in order to improve discharge performance and suppress the amount of ozone generated as much as possible.

However, in the wire type electric precipitator, since a thin metal wire is used for the discharge electrode of the ionizer section, there is a risk that the thin metal wire may be cut during maintenance such as electrode cleaning or during transportation. For this reason, the ionizer section is not cleaned, and as a result, the discharge electrode is disposable, resulting in increased costs. Furthermore, during manufacturing, it is necessary to manage the tension of the thin metal wire, leading to increased manufacturing costs.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrostatic precipitator which can suppress the amount of ozone generated as much as possible, and which can perform easy maintenance such as electrode cleaning and reduce costs.

[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 uses this corona discharge to remove dust in the air. This is an electric precipitator that collects dust using a collector electrode after being charged. A conductive layer is formed on an insulating substrate, and an area of the conductive layer other than a linear area of a required width is covered with an insulating layer. The basic gist is that the shaped region serves as the discharge electrode.

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

That is, in the electrostatic precipitator of the present invention, in the basic configuration described above, at least two conductive layers are formed on an insulating thin plate at a required interval, and one conductive layer is formed in a linear region of a required width. The remaining area is covered with an insulating layer so that the linear area serves as the discharge electrode, and the other conductive layer serves as the collector electrode.

(Function) A conductive layer is formed on an insulating thin plate, and an area of the conductive layer other than a linear area of a required width is covered with an insulating layer to configure the linear area as a discharge electrode. There are no protrusions where concentrated discharge occurs, and the amount of ozone generated is minimized.

Furthermore, since the conductive layer is formed on the insulating thin plate, there is almost no risk of cutting or the like compared to thin metal wires. Therefore, it becomes possible to suppress an increase in manufacturing costs, and maintenance such as electrode cleaning becomes easy.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In this embodiment, the ionizer section and the collector section are formed on a pair of opposed insulating thin plates and are integrally constructed.

First, the configuration of an electric precipitator will be explained with reference to FIG.
are arranged facing each other at a required interval, and furthermore, such two
A plurality of sets of strip-shaped thin plates 1.2 are arranged in parallel.

On the facing surfaces of each set of strip-like thin plates 1.2, an ionizer section is formed on the upstream side and a collector section is formed on the downstream side with respect to the air flow, as described below.

That is, two conductive layers 3.4 made of a thin film of an organic gold compound or the like are formed on the strip-shaped thin plate 1 at a required interval. Of these, the conductive layer 3 is 0. A region other than the linear region having a required width of about 5 mm is covered with an insulating layer 5 made of polyimide or the like, and a discharge electrode 6 is formed by the exposed linear region. The other conductive layer 4 is used as it is as a collector electrode (hereinafter, the reference numeral 4 is also used when referring to the collector electrode).

On the other hand, on the strip-shaped thin plate 2, a common counter electrode 7 is formed over a wide area so as to face both conductive layers 3.4, such as a thin plate of an organic gold compound similar to that described above.

The discharge electrode 6 and the counter electrode 7 form an ionizer section, and the collector electrode 4 and the counter electrode 7 form a collector section.

Next, an example of the manufacturing method will be explained using FIG. 2.

As shown in FIG. 2(a), two conductive layers 3.4 are formed by printing a thin film paste of an organic gold compound on the surface of an insulating strip-shaped thin plate 1 made of a thin glass plate. After that, as shown in FIG. 3B, an insulating layer 5 made of polyimide paste is formed by screen printing on the conductive layer 3 in areas other than the linear area with a width of about 0.5 mm, and the insulating layer 5 is exposed. A thin line-shaped discharge electrode 6 is formed by the linear area.

Printing thin lines of the required width on a strip-shaped thin plate from the beginning tends to cause wire breaks, making it difficult for mass production, but as mentioned above,
After forming the conductive layer 3 of an appropriate width, by screen printing the insulating layer 5 leaving a linear region, it becomes possible to form a thin wire-shaped discharge electrode 6 without fear of disconnection.
Also, mass production is possible.

Further, the other conductive layer 4 is used as it is as a collector electrode.

On the other hand, a conductive layer is formed on the strip electrode 2 by printing a thin plate paste of an organic gold compound in the same manner as described above, and a common counter electrode 7 is formed by this conductive layer.

Thereafter, a plurality of sets of thin strip plates 1.2 each having each electrode formed thereon are assembled in a desired manner to complete an electrostatic precipitator.

As described above, in the electrostatic precipitator of this embodiment, each ionizer part and collector part are formed by a pair of thin strip plates 1.
2, it is possible to make it smaller and more compact, and the thickness in the direction of air flow was about 40 mm for the conventional wire system, but this example has a thickness of about 40 mm. It is possible to reduce the size to about 20 mm and obtain the same dust collection effect.

When a high voltage is applied between the discharge electrode 6 and the counter electrode 7 to generate a corona discharge, the discharge electrode 6 is formed of a linear region of the conductive layer 3, so it always has a smooth surface. As a result, there are no protrusions where concentrated discharge occurs, and the amount of ozone generated is suppressed as much as possible.

Further, the thin wire-shaped discharge electrode 6 has almost no risk of being cut, etc., compared to a thin metal wire. Therefore, maintenance such as cleaning the electrodes at appropriate intervals of use becomes extremely easy, and there is no need to manage the tension of the thin metal wire during manufacturing, making it possible to suppress increases in costs.

In the above embodiments, a thin film paste of an organic gold compound was used as the conductive layer, but other materials may be used as long as they are conductors that are less affected by deterioration such as oxidation caused by ozone. In addition, polyimide paste was used as the insulating layer, but like the above-mentioned conductive layer, it is an insulator that is less affected by deterioration such as oxidation due to ozone and has good adhesion to the conductive layer and the insulating thin strip. If so, other materials can also be used. Further, although the conductive layer and the insulating layer are formed by a printing method, other film forming methods can also be applied.

[Effects of the Invention] As explained above, according to the present invention, a conductive layer is formed on an insulating thin plate, and an area of the conductive layer other than a linear area of a required width is covered with an insulating layer to Since the shaped area is used as a discharge electrode for corona discharge, there are no protrusions on the surface of the discharge electrode that would cause concentrated discharge, and the amount of ozone generated can be suppressed to the utmost. In addition, since there is almost no risk of the discharge electrode breaking, etc., maintenance such as cleaning the electrode becomes easier, and the discharge electrode part can be avoided from being disposable.Furthermore, there is no need to manage the tension of thin metal wires during manufacturing. Therefore, the increase in cost can be suppressed, and cost reduction can be achieved.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of an electrostatic precipitator according to the present invention, Fig. 2 is a process diagram showing an example of the manufacturing method of the above embodiment, and Fig. 3 is a configuration diagram showing a conventional electrostatic precipitator. It is a diagram. 1.2: Insulating strip-shaped thin plate, 3: Conductive layer, 4: Conductive layer (collector electrode), 5: Insulating layer, 6: Discharge electrode formed of a linear region of the conductive layer, 7: Counter electrode.

Claims (1)

[Claims] An electric precipitator that generates corona discharge between a discharge electrode and a counter electrode, charges dust in the air with this corona discharge, and collects the dust with a collector electrode, forming a conductive layer on an insulating substrate. An electrostatic precipitator characterized in that an area of the conductive layer other than the linear area of a required width is covered with an insulating layer, and the linear area serves as the discharge electrode.