JP2002126576A - Electrode for electric precipitator and air cleaner using the electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dust collection performance by stabilizing the potential of the surface of an electrode and to control it so as not to exceed the energy for carbonizing the plastic of the electrode by diffusing a current leaking from the conductive part of the surface of a high voltage electrode. SOLUTION: The high voltage electrode 1 is constituted by laying a first plastic film in which the conductive part 4 is formed on one side and a second plastic film in which no conductive part is formed and has the same size as that of the former to overlap each other with the conductive part made inside and forming through holes 5 penetrating the conductive part 4 in the films. A grounding electrode 6 is constituted by a metal film in which a through hole 11 is formed in a part opposite to the conductive part 4 of the electrode 1. A plurality of spacers for holding the distance between the electrodes 1 and 6 are formed integrally with the plastic films of the electrode 1 to connect the electrodes with a proper electric resistance value kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode for collecting electricity and an air cleaner using the same in a dust collecting section.

[0002]

2. Description of the Related Art An electrode portion of an electric dust collecting unit such as an air cleaner has a structure in which high-voltage electrodes and ground electrodes are alternately stacked. In addition, an electrode using a plastic film is used to improve dust collection performance and prevent sparking. A conventional electrode using a plastic film insulates a high-voltage electrode from a ground electrode by adopting a method of completely covering a conductor with a plastic film or covering only one surface.

For example, in the electrode structure disclosed in Japanese Patent Application Laid-Open No. 1-26955, an entire surface of a flat conductive portion is covered with an insulating film, and one of the conductive portions is exposed from an end of the insulating film. A positive electrode plate having a plurality of projecting spacers provided on both surfaces of the insulating film, and a plurality of openings provided on the insulating film surface on the leeward portion of the spacers, and a positive electrode plate partially exposing the conductive portion, and a metal plate. And a negative electrode plate in the form of a laminate.

Further, in the electrode structure disclosed in Japanese Patent Application Laid-Open No. H11-221492, a film-shaped insulator and a protruding portion formed by partially processing the insulator protruding from one surface of the insulator. And a conductive paint applied to a portion of the other surface of the insulator slightly narrower than the insulator and up to the vicinity of the protrusion, with the two insulators having the conductive paint applied surface inside. A film-like electrode formed by bonding together is used as a high-voltage electrode of the collector.

[0005]

However, simply covering the conductor with a plastic film has the drawback that it is vulnerable to environmental changes such as changes in humidity and does not exhibit dust collecting ability. One of the causes is that when the surface of the high-voltage electrode is contaminated with dust or the like and the humidity rises, the charge is taken away by the dust or moisture in the air, and the surface potential of the high-voltage electrode decreases. Therefore, as one means to stabilize the surface potential, instead of completely insulating the high-voltage electrode and the ground electrode, a conductive portion is provided on the surface of the high-voltage electrode to supply the charge taken by dust and the like. Surface potential can be stabilized.

However, when a conductive portion is provided on the surface of the high-voltage electrode, a current may flow from the conductive portion to the ground electrode, so that tracking may occur on the surface of the plastic film. As a cause of the tracking, a minute discharge occurs due to a portion having a low insulation resistance and a portion having a high insulation resistance on a plastic surface. A high temperature portion is locally generated in the portion where the minute discharge occurs, and at a certain temperature or higher, the plastic is carbonized. When the carbonized portion becomes large and the high-voltage electrode and the ground electrode are short-circuited, a large current flows through the carbonized portion, and the plastic electrode may melt or cause a fire.

In addition, the electrode surface is contaminated as the operating time becomes longer. Most of the contamination is from the ground electrode,
High voltage electrodes are also contaminated. Contamination on the electrode surface also causes micro-discharge. Also, when the electrode surface is contaminated, the charge of the dust lowers the surface potential of the high-voltage electrode,
Dust collection performance is reduced.

Accordingly, a first object of the present invention is to improve the dust collection performance by stabilizing the potential on the electrode surface, and to diffuse the current leaking from the conductive portion on the high voltage electrode surface, thereby making the plastic It is an object of the present invention to reduce the energy of carbonization to less than the carbonization energy, and to prevent a reduction in dust collection performance due to tracking and a fire.

When both or one side of the high-voltage electrode is covered with a plastic film, the distance between the electrodes can be reduced as compared with the case where no plastic film is provided. As a result, the electric field strength is increased, and the dust collection performance is improved. Become.
However, when the conductor is present on the surface of the plastic film, a spark is generated from the conductor to the ground electrode, which may cause a deterioration in dust collection performance or a fire.

Therefore, a second object of the present invention is to prevent a spark by increasing a discharge distance from a conductive portion on the surface of a high voltage electrode to a ground electrode.

There is a spacer between the high voltage electrode and the ground electrode to keep the distance between the electrodes. FIG. 10 shows a conventional example in which the spacer and the high-voltage electrode are made of different parts.
In the figure, 51 is a high voltage electrode using a plastic film, 52 is a ground electrode, 53 is a spacer, and the spacer 53 is a cylindrical shape having a through hole at the center, and a screw or rod 54 is inserted through the through hole. Thus, the high voltage electrode 51 and the ground electrode 52 are joined via the spacer 53. With such a structure, a space is generated at the joint, so that the contact resistance increases and a minute discharge occurs. This causes deterioration of dust collection performance and tracking. In addition, the number of parts increases, and the dust collection unit becomes expensive.

Therefore, a third object of the present invention is to form a high-voltage electrode and a spacer integrally, thereby eliminating the space between the high-voltage electrode and the spacer, reducing the contact resistance and minimizing the discharge between the high-voltage electrode and the spacer. And to reduce the resistance of the leak path to stabilize the surface potential of the high-voltage electrode.

When the high-voltage electrode and the ground electrode are appropriately laminated, a gap between the electrodes is generated in the dust collection unit, so that a space is generated between the high-voltage electrode and the ground electrode, and the dust collection performance is reduced and the contact between the high-voltage electrode and the ground electrode is reduced. The resistance increases or a minute discharge occurs. This causes deterioration of dust collection performance and tracking.

Therefore, a fourth object of the present invention is to eliminate the gap between the electrodes and prevent the generation of minute discharge between the high voltage electrode and the ground electrode by adopting a structure in which pressure is applied during lamination. It is another object of the present invention to reduce the resistance of the leak path to stabilize the surface potential of the high-voltage electrode.

A fifth object of the present invention is to provide an air purifier having a stable dust collecting performance by using an electric dust collecting unit having the above-mentioned electric dust collecting electrode.

[0016]

According to a first aspect of the present invention, there is provided an electrostatic precipitating electrode according to the first aspect of the present invention, wherein the high-voltage electrode comprises a first plastic film having a conductive portion formed on one surface. And a second plastic film of the same size that does not form a conductive portion is polymerized with the conductive portion inside, and a through hole is provided in the first and second plastic films so that the conductive portion also penetrates, The ground electrode is made of a metal film. Also, a plurality of spacers are arranged, and connect the high-voltage electrode and the ground electrode with an appropriate electric resistance value.

According to a second aspect of the present invention, there is provided an electrostatic precipitating electrode according to the second aspect of the present invention, in addition to the configuration of the first aspect, further comprising a ground electrode, a portion facing the conductive portion of the high-voltage electrode. Are provided with through holes.

According to a third aspect of the present invention, there is provided an electrostatic precipitating electrode according to the third aspect of the present invention, wherein a spacer is integrated with a plastic film constituting a high-voltage electrode. Has formed.

According to a fourth aspect of the present invention, in order to achieve the fourth object, in addition to the configuration of the third aspect of the present invention, the spacer has a spring property.

According to a fifth aspect of the present invention, the air purifier achieves the fifth object by using the above-mentioned electric dust collecting unit including the electric dust collecting electrode and the ionizing section.

[0021]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a high-voltage electrode 1 according to the present invention. This high-voltage electrode 1 is a rectangular first electrode of the same size.
And the second two plastic films 2 and 3 are superposed. On one surface of the first plastic film 2, a conductive portion 4 coated with a conductive paint is formed, but on the second plastic film 3, no conductive paint is applied.

In the first plastic film 2,
The application area of the conductive paint is slightly smaller than that of the plastic film 2, and several mm at the four sides of the plastic film 2 are not applied. A conductive protrusion is integrally formed on the conductive portion 4 made of the conductive paint to facilitate application of a high voltage. These two plastic films 2 and 3 are bonded together with the conductive part 4 inside.

Also, two plastic films 2 and 3
Is provided with a through hole 5 through which the conductive portion 4 also passes.
When the through-hole 5 is provided in the high-voltage electrode 1 as described above, a conductive portion is formed on the electrode surface, a charge can be given to the electrode surface from this, and the potential on the electrode surface can be normally maintained, and Since the charge on the electrode surface can be taken in and out through the through hole 5, the surface potential can be stabilized.

FIG. 2 shows the ground electrode 6. The ground electrode 6 is designed not to be damaged even if a minute discharge or tracking occurs, and to be chemically stable even if contaminated.
It is formed of a single metal film such as stainless steel or aluminum and has the same size as the high voltage electrode 2.

FIG. 3A shows the high voltage electrode 1 of FIG.
A dust collecting portion 8 in which the ground electrode 6 is opposed to the ground electrode 6 with a spacer 7 kept therebetween at an interval, an ionizing portion 9 for ionizing dust and the like using corona discharge, and a high-voltage electrode 1 and an ionizing portion 9. High voltage power supply 10 for applying high voltage to electrodes
And an electric dust collection unit composed of:

The spacer 7 includes the high voltage electrode 1 and the ground electrode 6
And the high voltage electrode 1 and the ground electrode 6 are connected with an appropriate electric resistance value. With this configuration of the spacer 7, the distance between the electrodes can be accurately maintained, and the current flowing to stabilize the surface potential of the high-voltage electrode 1 does not concentrate on the portion of the through hole 5 of the conductive portion 4. Since it is diffused to the ground electrode 6 by the, the tracking becomes less likely to occur. From this, FIG.
As shown in (b), the distance between the high-voltage electrode 1 and the ground electrode 6 can be made close to form a multilayer electrode structure.

FIG. 4 shows a ground electrode 6 made of a metal film.
1 shows a ground electrode structure in which a through hole 11 is provided in a portion of a high-voltage electrode 1 facing a conductive portion 4. When the through-hole 11 is provided in the ground electrode 6 in this manner, a large linear distance of discharge can be ensured so that the above-described conductive portion formed on the surface of the high-voltage electrode 1 does not directly spark to the ground electrode 6. .

As described above, by preventing sparking between the high-voltage electrode 1 and the ground electrode 6, tracking of the high-voltage electrode 1, which is a plastic film electrode, abnormal discharge noise, breakage and dissolution of the plastic film electrode, and the like can be prevented. Can be prevented. Further, the dust collection performance can be stabilized in order to prevent the above abnormalities.

FIG. 5 shows a structure in which a plurality of spacers 7 are integrally formed on both sides of the conductive portion 4 on a plastic film constituting the high-voltage electrode 1. FIG. 6 shows a side surface of one spacer 7, and FIG. 7 shows a plane surface. Thus, the spacer 7
By integrally forming, the number of parts can be reduced, and at the same time, the gap between the spacer 7 and the plastic films 2 and 3 generated when the dust collecting unit is assembled can be eliminated.

By filling the gap, it is possible to suppress a minute discharge occurring in a minute space between the plastic film electrodes (plastic films 2 and 3) and the spacer 7. Tracking can also be suppressed by suppressing the minute discharge. In addition, since contact resistance between the plastic film electrodes (plastic films 2 and 3) and the spacer 7 can be eliminated, tracking can be suppressed.

When the spacer 7 is formed integrally with the plastic film, hard burrs and barbs cannot be formed unlike the case of metal, so that the plastic of the high-voltage electrode 1 is not damaged and short-circuiting occurs between the electrodes. .

FIGS. 8 and 9 are views when the dust collecting unit of the dust collecting unit is assembled. Only by alternately stacking the high voltage electrodes 1 and the ground electrodes 6 as shown in FIG. 8, a gap may be formed between the spacer 7 and the electrodes 1 and 6. If a gap is formed, a very small discharge may occur, or the wind may cause rattling and noise.

If the spacer 7 of the high-voltage electrode 1 is provided with a spring property in order to prevent these, pressure can be applied when the electrodes 1 and 6 are stacked to fill the gap. Also, by providing the spacer 7 with a spring property, the contact between the high-voltage electrode 1 and the ground electrode 6 can be enhanced, and the suppression of micro-discharge and the stability of the surface potential can be further enhanced. A reduction in dust performance can be suppressed.

[0035]

According to the first aspect of the present invention, since the high-voltage electrode is provided with a through-hole to provide an electric charge to the electrode surface, the electric potential on the electrode surface can be normally maintained, and the high-voltage electrode can be maintained normally. Since the charge on the electrode surface can be taken in and out through the holes, the surface potential can be stabilized. In addition, a plurality of spacers provided between the high-voltage electrode and the ground electrode allow the charge that causes a decrease in surface potential to flow not only to the high-voltage electrode but also to the ground electrode, thereby preventing tracking. Can be.

According to the second aspect of the present invention, by providing a through hole in the ground electrode, a large discharge distance from the conductive portion on the surface of the high voltage electrode to the ground electrode can be secured. And a spark between the ground electrode can be prevented.

According to the third aspect of the present invention, since the spacer is integrally formed on the plastic film of the high voltage electrode, the contact resistance between the spacer and the high voltage electrode is reduced and the gap is filled. Also, it is possible to prevent minute discharge and tracking between the high voltage electrode and the spacer.

According to the fourth aspect of the present invention, since the spacer has a spring property, pressure can be applied during assembly. In addition, since the contact resistance between the high voltage electrode and the ground electrode can be reduced and rattling can be suppressed, noise can be prevented, minute discharge can be prevented, and tracking can be suppressed.

Since the air purifier of the fifth aspect has the dust collecting unit having the features of the first to fourth aspects, an air purifier having a stable dust collecting performance can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a high-voltage electrode in an electrode for collecting electricity of the present invention.

FIG. 2 is a perspective view of a ground electrode in the electrode for collecting electricity of the present invention.

FIG. 3 (a) is a configuration diagram of a dust collecting unit using the electric dust collecting electrode of the present invention in a dust collecting portion, and FIG. 3 (b) is a structural diagram of only the electric dust collecting electrode.

FIG. 4 is an exploded perspective view of the electrode for collecting electricity of the present invention in which a through hole is provided in a ground electrode.

FIG. 5 is a perspective view of a high voltage electrode in which a spacer is integrally formed on a plastic film.

FIG. 6 is a side view of one spacer in FIG. 5;

FIG. 7 is a plan view of the same.

FIG. 8 is a structural diagram of a dust collecting portion in which high voltage electrodes and ground electrodes are simply stacked alternately.

FIG. 9 is a structural diagram of a dust collecting portion in which a high voltage electrode and a ground electrode are stacked by applying pressure.

FIG. 10 is an exploded perspective view showing an assembly structure of a conventional electrode for collecting electricity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High voltage electrode 2 1st plastic film 3 2nd plastic film 4 Conductive part 5 Through hole 6 Ground electrode 7 Spacer 8 Dust collecting part 9 Ionization part 10 High voltage power supply 11 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F24F 7/00 F24F 7/00 A

Claims (5)

[Claims] 1. An electrostatic precipitating electrode in which a high-voltage electrode and a ground electrode are stacked facing each other with a space therebetween by a spacer, wherein the high-voltage electrode is a first electrode having a conductive portion formed on one surface. A plastic film and a second plastic film of the same size without forming a conductive portion are polymerized with the conductive portion inside, and a through hole is provided in the first and second plastic films so that the conductive portion also penetrates. Wherein the ground electrode is formed of a metal film, a plurality of the spacers are arranged, and the high-voltage electrode and the ground electrode are connected with an appropriate electric resistance value. , Electrode for collecting electricity. 2. The electrode according to claim 1, wherein a through hole is provided in the ground electrode at a portion facing the conductive portion of the high voltage electrode. 3. The electrode according to claim 1, wherein the spacer is formed integrally with a plastic film forming the high-voltage electrode. 4. The electrode for collecting electricity according to claim 3, wherein the spacer has a spring property. 5. An air purifier comprising an electrostatic precipitating unit comprising the electric precipitating electrode according to claim 1 and an ionizing section.