JPH03196853A - Electrostatic precipitator - Google Patents

Abstract

PURPOSE:To equip the sufficient mechanical strength, to make handling easy and to enhance reliability and safety by integrally providing a bandlike discharge electrode to a first base plate made of the electrical insulating material and forming a discharge electrode body. CONSTITUTION:A first many ventilating holes 13 are bored on a first base plate 12 made of the electrical insulating material. A discharge electrode body 11 is formed by integrally providing a bandlike discharge electrode 14 on at least one side of plate surfaces of the first base plate 12. Further, the counter electrode bodies 17, 18 are formed by boring a second many ventilating holes 21 on a second conductive base plate 19. The counter electrode bodies 17, 18 are oppositely arranged on the plate surface provided with at least discharge electrode 14. As a result, the discharge electrode body is provided with sufficient mechanical strength. Thereby handling is made easy at a time of maintenance and at a time of transportation and also reliability and safety are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an electrostatic precipitator that is incorporated into, for example, an air conditioner.

(Prior Art) Recently, in order to remove fine dust from the indoor air circulated by the air conditioner, an electric precipitator has been incorporated into the air conditioner.

As shown in FIG. 5, the general structure of the electrostatic precipitator includes an ionization section 1 that ionizes dust, and a dust collection section 2 that collects the dust ionized by the ionization section 1.

Each of the ionization sections 1 is composed of a plurality of counter electrodes 3 and a plurality of discharge electrodes 4. A metal plate 3a is used for the counter electrode 3, and a plurality of metal plates 3a are arranged facing each other at a predetermined interval. As the discharge electrode 4, thin metal wires 4a are used, and these metal wires 4a are stretched so as to face the counter electrode 3. The counter electrode 3 is grounded, and the discharge electrode 4 is connected to the positive side of the high voltage power supply section 5.

The dust collection section 2 is composed of a plurality of dust collection electrode plates 8 each having a conductive layer 7 provided on an insulating sheet 6 made of a synthetic resin such as polypropylene. These dust collecting electrode plates 8 are arranged facing each other at a predetermined interval, and every other half of the dust collecting electrode plates 8 has a conductive layer 7.
is grounded, and the remaining half of the conductive layer 7 is connected to the positive side of the high voltage power supply section 5.

When indoor air flows through the electrostatic precipitator having such a configuration in the direction shown by the arrow in the figure, the dust contained in the air is ionized in the ionization section 1 and given an electric charge, and then the dust is transferred to the dust collection section 1. The dust is collected by the second dust collecting electrode plate 8.

By the way, if the thin metal wire 4a is used as the discharge electrode 4 of the ionization section 1, if the metal wire 4a is inadvertently subjected to impact or bumps during maintenance or transportation, it will easily break. There were times when I ended up doing this. Furthermore, in order to obtain good discharge, it is required to use a thinner metal wire 4a. Therefore, it is necessary to use an expensive material such as tungsten, which is thin but has high strength and excellent corrosion resistance, resulting in high costs.

Furthermore, since some dust or dirt adheres to the metal wire 4a of the discharge electrode 4 during use, it is inevitable that a reverse ionization phenomenon will occur. As a result, the metal wire 4a vibrates and cannot maintain an insulating distance from the metal plate 3a of the counter electrode 3, which may cause spark discharge to generate abnormal noise or break the metal wire 4a. Moreover, in order to stretch the metal wire 4a with a constant tension, the structure may become complicated.

(Problem to be solved by the invention) As described above, in conventional electrostatic precipitators, metal wires are used for the discharge electrode of the ionization section, which not only makes it easy to cut, but also makes it difficult to cut. Since expensive materials had to be used, costs increased.

This invention was made based on the above-mentioned circumstances, and its purpose is to provide an electrostatic precipitator that does not require the use of metal wires for discharge electrodes.

[Structure of the invention] (Means and effects for solving the problems) In order to solve the above problems, the present invention provides a first method made of an electrically insulating material.
A large number of first ventilation holes are formed in a substrate, and a strip-shaped discharge electrode is integrally provided on at least one plate surface of the first substrate to form a discharge electrode body. A large number of second ventilation holes are formed in the substrate to form a counter electrode body, and the counter electrode body is arranged to face at least the plate surface of the discharge electrode body on which the discharge electrode is provided.

According to this configuration, since the discharge electrode is provided on the first substrate instead of the metal wire, the discharge electrode is reinforced by the first substrate, so that it has a strength that prevents it from being easily cut. be able to.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The electrostatic precipitator shown in FIG. 1 includes a discharge electrode body 11. This discharge electrode body 11 has a rectangular plate-shaped first substrate 12 made of an electrically insulating material such as polypropylene or vinyl chloride, and this first substrate 12 has a large number of first ventilation holes 13. is drilled. The first ventilation holes 13 are formed in a plurality of rows in the vertical direction, and the first ventilation holes 13 in each row in the vertical direction are each 1/2 in the horizontal direction.
They are arranged in a staggered pattern to improve the space factor.

A large number of very thin linear discharge electrodes 14 are formed on one surface of the first substrate 12 by etching a conductive metal such as copper foil. In other words, the discharge electrode 14 is provided between the rows of the first ventilation holes 13, covering almost the entire length of the first substrate 12 in the width direction, and its width is set to 50 to 100 μm and the thickness is set to about 30 μm. has been done. Both ends of each discharge electrode 14 are electrically connected to strip-shaped power supply patterns 15 provided along the vertical direction at both ends of the first substrate 12 in the width direction. This power supply pattern 15 may be formed by etching a conductive metal in the same way as the discharge electrode 14 described above. The discharge electrode 14 is connected to the positive side of a high voltage power source 16.

A first counter electrode body 17 is disposed in a spaced-apart manner on the upstream side in the flow direction of the indoor air, which is indicated by the arrow in FIG. , a second counter electrode body 18 is disposed on the downstream side, which is the other plate surface side.
are placed facing each other at a distance. These counter electrode bodies 17
．． 18 is formed by forming a large number of second ventilation holes 21 in a staggered manner similar to the first substrate 12 described above in a second substrate 19 made of a conductive material such as copper or aluminum. The pair of opposing electrode bodies 17 and 18 are connected to the negative side of the high voltage power supply 16. In other words, it is grounded.

Note that the discharge electrode body 11 and a pair of counter electrode bodies 17.1
8, the diameter and pitch of the first and second ventilation holes 13.21 are set so that the aperture ratio is about 60%.

In the electrostatic precipitator configured in this way, the high voltage power supply 1
6 is turned on, corona discharge occurs between the discharge electrode 14 formed on the discharge electrode body 11 and one plate surface of the first counter electrode 17 facing the discharge electrode 14. As a result, indoor air flows as shown by the arrow in Figure 1,
When the air passes through the second ventilation hole 21 of the first counter electrode body 17, the dust contained in the air is ionized by the corona discharge and given an electric charge.

Ionized dust flows through the first ventilation hole 1 of the discharge electrode body 11.
3, it is collected on the plate surface of the second counter electrode body 18 disposed on the downstream side of this discharge electrode body 11. Therefore, the indoor air passing through the second ventilation hole 21 of the second counter electrode body 18 is in a clean state free of dust.

Incidentally, the discharge electrode 14 of the discharge electrode body 11 is integrally provided on the first substrate 12 made of an electrically insulating material by etching. Therefore, even if the discharge electrode 14 is formed to be sufficiently thin to obtain a good discharge, it is reinforced by the first substrate 12 and has sufficient mechanical strength.

Therefore, even if an unexpected impact is applied during maintenance or transportation, there will be no breakage.

Even if one or two of the plurality of discharge electrodes 14 are cut, the uncut discharge electrodes 14 will have the power supply pattern 15.
Since the dust collection performance can be supplied from the main unit, the dust collection performance will not be completely lost.

Furthermore, the first substrate 12 of the discharge electrode body 11 and the second substrate 19 of the pair of opposing electrodes 17. Since the ventilation holes 23 of these electrode bodies 11.17
．． The 18 plate surfaces can be arranged perpendicular to the flow of indoor air. Thereby, an electrostatic precipitator can be formed by three electrodes 11.17.18, so that
It is possible to simplify the configuration.

Furthermore, since the ionization section and the dust collection section can be formed by simply arranging the two opposing electrode bodies 17 and 18 on both sides of one discharge electrode body 11, the ionization section and the dust collection section can be formed. The structure can be simplified compared to a conventional two-stage dust collector in which the dust collector and the dust collector are formed separately.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, the discharge electrode 14 formed on one plate surface of the discharge electrode body 11
may be formed in a lattice shape as shown in FIG. In this way, even if the discharge electrode 14 is cut, the current is only partially cut off at the cut point z, and the other parts can be energized, but the dust collection capacity at the time of cutting is reduced. can reduce the decrease in

Further, the first substrate of the discharge electrode body may have a discharge electrode formed not only on one plate surface but also on both plate surfaces, and also on the downstream plate surface of the first substrate. Instead of the discharge electrode, a conductive film may be provided on the entire surface of the discharge electrode, so that the downstream plate surface of the discharge electrode body may function only for dust collection.

Furthermore, when a corona discharge is generated between the discharge electrode body and the first counter electrode body disposed opposite to the plate surface on the upstream side, dust in the air is charged in these spaces and Since charged dust can be collected to some extent on the plate surface of the discharge electrode body, it is possible to function as a dust collector without providing a second counter electrode body downstream of the discharge electrode body. be.

Further, the means for integrally providing the discharge electrode on the substrate is not limited to etching, and may be provided by sputtering, silk printing with conductive paint, or the like.

[Effects of the Invention] As described above, in the present invention, the discharge electrode is integrally provided on the first substrate of the discharge electrode body. Therefore, even if the discharge electrode body is made thin to obtain good discharge,
It is reinforced by the first substrate, has sufficient mechanical strength, and can be easily cut, which not only facilitates handling during maintenance and transportation, but also improves reliability and safety. Furthermore, since the dust collector can be configured with a discharge electrode body in which one first ventilation hole is formed and a counter electrode body in which at least one second ventilation hole is formed, there are fewer parts. It can be configured simply using points.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the overall structure showing one embodiment of the present invention;
Figure 2 is a front view of a partially enlarged discharge electrode body, Figure 3 is a sectional view of a partially enlarged discharge electrode body, and Figure 4 is a partially enlarged cross-sectional view of the discharge electrode body.
The figure is a partially enlarged front view of a discharge electrode body showing another embodiment of the present invention, and FIG. 5 is a configuration diagram of a conventional dust collector. DESCRIPTION OF SYMBOLS 11... Discharge electrode body, 12... 1st board|substrate, 13...
...First ventilation hole, 14...Discharge electrode, 17...First counter electrode, 18...Second counter electrode, 19...
Second board, 21... second ventilation hole.

Claims (1)

[Claims] A plurality of first ventilation holes are formed in a first substrate made of an electrically insulating material, and a band-shaped discharge electrode is integrally provided on at least one plate surface of this first substrate to form a discharge electrode body. On the other hand, a large number of second ventilation holes are formed in a conductive second substrate to form a counter electrode body, and this counter electrode body is connected to at least the plate surface of the discharge electrode body on which the discharge electrode is provided. An electrostatic precipitator characterized in that the electrostatic precipitator is configured such that the two are arranged opposite to each other.