JPH09227106A - Apparatus for corona discharge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for corona discharge capable of producing ozone and simultaneously mass producing negative ions corresponding to the production amount of the ozone. SOLUTION: This apparatus for corona discharge comprises a corona discharge element capable of producing ozone and negative ions from air by corona creeping discharge. The corona discharge element has an insulating layer, an induction electrode 25, a discharge electrode 27 and a protecting layer 29 for covering the discharge electrode 27. The layer thickness of the protecting layer 29 for the discharge electrode 27 is provided with a thickening part 35 for the protecting layer 29, having a thickness of about 2 times that of a region 31 on the upstream side in the air inflow direction and formed in a region 33 on the downstream side in the air inflow direction corresponding to a site along an outer edge of the electrode 27 on the surface of the protecting layer 29. When a high-voltage driving power source for a negative potential is connected to the induction electrode 25 and the discharge electrode 27, the corona creeping discharge is generated on the side of the region 31. The generation thereof is suppressed on the side of the region 33 and the discharge region is substantially only one row on the side of the region 31. The ozone and negative ions are produced from the air flowing from the direction of an arrow only thereinto in the region 31. Thereby, the amount of the taken out negative ions based on the production amount of the ozone is remarkably increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a corona discharge device equipped with a corona discharge element for generating ozone and negative ions from the air by creeping corona discharge.

[0002]

2. Description of the Related Art Conventionally, in a corona discharge device, as shown in FIG. 1, a high voltage negative potential drive power source 7 is connected to an induction electrode 3 and a discharge electrode 5 which are opposed to each other with an insulating layer 1 in between, and an insulating layer is formed. There is known a device configured to generate a creeping discharge in a corona discharge element 9 composed of 1 and electrodes 3 and 5 to generate ozone and negative ions from the atmosphere.

[0003]

By the way, in this corona discharge device, the protective layer 11 (also the corona discharge element 9) corresponding to the location where the creeping corona discharge is along the outer edge of the discharge electrode 5.
It composes of)) on the surface. Therefore, as shown in FIG. 2, the discharge region has a reference numeral 13 in the protective layer 11.
And two parts are formed in two rows.

Therefore, in the above device, these discharge regions 1
In order to allow air to efficiently pass through 3, 15, the air flow is generally set in a direction perpendicular to the extending direction of the discharge regions 13, 15.

However, when ozone and negative ions are produced by the above apparatus, a large amount of ozone can be produced.
In comparison with this, the amount of negative ions produced was considerably small, and therefore it was difficult to extract an amount of negative ions commensurate with the amount of ozone produced. One of the reasons for this is that negative ions have a property of being unstable and easily extinguished as compared with ozone, but it is considered that there are various other factors.

[0006] The inventors of the present invention, therefore, have found that it is possible to increase the amount of negative ions produced as a result of repeated studies on the cause of the amount of negative ions produced being smaller than the amount of ozone produced.

Accordingly, an object of the present invention is to provide a corona discharge device capable of simultaneously producing ozone and simultaneously producing a large amount of negative ions corresponding to the ozone production amount.

[0008]

SUMMARY OF THE INVENTION In the present invention, the corona discharge element has a structure having only one row of discharge regions extending in a direction transverse to the air flow.

Since the discharge region is usually formed on the surface of the protective layer covering the discharge electrode at a position corresponding to the two edge portions of the discharge electrode, for example, the thickness of the protective layer is set to one edge. If you set it thin in the area and thick in the other edge area,
Since the occurrence of creeping corona discharge is suppressed at the edge portion on the thick side of the protective layer, the discharge region is substantially only one row.

Further, an induction electrode of an insulating layer is provided so that one edge portion of the discharge electrode corresponds to a portion where the induction electrode exists and the other edge portion corresponds to a portion where the induction electrode does not exist. By forming it on the surface on the side opposite to the surface on which it is formed, only one of the two edge portions can be used as the discharge region.

Thus, if the discharge area is limited to one row, ozone and negative ions generated in the discharge area of the first row are again discharged in the second row, as in the corona discharge element of the conventional device. No more passing through the area. Therefore, it is possible to significantly reduce the degree of disappearance of negative ions.

When the discharge region is only one row as described above, the length of the discharge electrode in the direction along the peripheral portion is at least the same as the length in the direction of the peripheral portion of the induction electrode. It is preferable to set it long.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

3 and 4 show an embodiment of a corona discharge element included in the corona discharge device of the present invention.

As shown in the figure, this corona discharge element has a substrate 21, an insulating layer 23 laminated on the front surface thereof, a rectangular induction electrode 25 provided on the rear surface thereof, and a position crossing the central portion of the electrode 25. A strip-shaped discharge electrode 27 is provided on the surface of the insulating layer 23 so as to face the electrode 25 with both ends protruding from the electrode 25. The corona discharge element further includes a protective layer 29 laminated on the surface of the insulating layer 23 for covering the discharge electrode 27.

In the present embodiment, the layer thickness of the protective layer 29 is such that, in the region 31, 33 on the surface thereof corresponding to two locations along the outer edge of the discharge electrode 27, the region 31 on the upstream side in the air inflow direction is: The thickness is set so that the surface corona discharge can be generated normally. On the other hand, in the region 33 on the downstream side in the air inflow direction, the protective layer thickening portion 35 having a thickness of about twice the normal thickness including the layer thickness on the region 31 side is formed. The area where the occurrence of creeping corona discharge is suppressed.

In the above structure, when a high voltage negative potential drive power source (not shown) as shown in FIG. 1 is connected to the induction electrode 25 and the discharge electrode 27, a creeping corona discharge is generated on the region 31 side. No discharge occurs on the region 33 side, and the discharge region is substantially one row on the region 31 side.

Therefore, ozone and negative ions are generated from the air flowing into the corona discharge device (not shown) from the direction of the arrow only in the region 31 where the creeping corona discharge occurs. However, even with such a device in which the discharge area is simply reduced from two rows to one row, compared with the conventional apparatus in which the discharge area is kept in two rows, the amount of negative ions taken out relative to the amount of ozone produced is (Ie, the ion / ozone ratio) can be greatly increased. In this way, the discharge area is set to the discharge electrode 2
When only the region 31 of No. 7 is arranged in a line, the length of the discharge electrode 27 in the direction along the region 31 (or region 33) is, as shown in the figure, the above-mentioned region 31 (or region 3) of the induction electrode 25.
It is preferable that the length is set longer than the length along the direction 3), or at least the same length is set.

These facts were confirmed by the inventors of the present invention by carrying out an experiment for producing negative ions and ozone by using the corona discharge device having the above structure and the conventional corona discharge device, and measuring the negative ion concentration and ozone concentration. It is clear from the result. The details of the experiment will be described below with reference to FIG.

FIG. 5 shows the measured data of the negative ion concentration and ozone concentration obtained in the experiments of negative ion and ozone production, respectively, which were carried out by using the apparatus of this embodiment and the conventional apparatus separately. The comparison result with the ion / ozone ratio data is shown.

As shown in the figure, in the device of this embodiment, the absolute amounts of the negative ion concentration and the ozone concentration were lowered, but it was found that the ion / ozone ratio can be made about twice that of the conventional device. did.

Here, it is considered that the absolute amounts of the negative ion concentration and the ozone concentration are lowered because the discharge area is reduced from two rows to one row. Therefore, regarding these absolute amounts, the discharge area in the discharge region 31 for one column is set to 2 by setting the length of the discharge region to be long, for example.
There is no problem because the size can be easily increased to the level of the conventional device or more by simply making the size equal to or larger than the discharge region of the column.

The reason why the ion / ozone ratio in this embodiment can be improved to about twice as much as that of the conventional device is considered as follows.

That is, in the corona discharge element of the conventional device, since there are two rows of discharge regions, of the negative ions and ozone generated in the discharge region of the first row, the negative ions are considerably inferior to ozone. 2 because it is stable and easy to disappear
It is presumed that some of them disappeared when passing through the discharge region of the row.

Therefore, if the discharge area is reduced from two rows to one row as in the corona discharge element of the present embodiment, the ozone generated in the first row discharge area as in the corona discharge element of the conventional device. And, negative ions will not pass through the discharge region of the second row again. Therefore, it is considered that the degree of disappearance of negative ions can be greatly reduced.

6 and 7 show another embodiment of the corona discharge element included in the corona discharge device of the present invention.

In the present embodiment, as shown in the drawing, the discharge electrode 47 is provided on the back surface of the insulating layer 43 and the induction electrode 45.
So that they are partially overlapped with each other (electrode 4
5 and 47 are formed so that the overlapping portion and the protruding portion are formed respectively), the area is enlarged by providing a large width, and the surface is provided on the surface of the insulating layer 43. 6 and 7, reference numeral 41 is a substrate and reference numeral 49 is a protective layer.

With the above structure, only one region of the discharge region along the outer edge of the discharge electrode 47 indicated by the reference numeral 51 faces the induction electrode 45, and the discharge electrode 47 indicated by the reference symbol 53 is formed. Since the other areas along the outer edge protrude from the induction electrode 45, only the area 51 serves as a discharge area. In this way, when the discharge region is arranged in a line only with the region 51 of the discharge electrode 47, the length of the discharge electrode 47 in the direction along the region 51 (or the region 53) is, as shown in the figure, the above region of the induction electrode 45. It is preferable to set the length longer than the length along 51, or at least set the same length.

Therefore, also in this embodiment, the same effect as in the above-described one embodiment can be obtained.

The above contents are only related to the respective embodiments of the present invention, and needless to say, the present invention is not limited to the above contents.

[0031]

As described above, according to the present invention,
It is possible to provide a corona discharge device capable of simultaneously producing ozone and simultaneously producing a large amount of negative ions corresponding to the ozone production amount.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional corona discharge device.

FIG. 2 is a plan view of a corona discharge element included in the device of FIG.

FIG. 3 is a plan view of a corona discharge element according to an embodiment of the present invention.

4 is a cross-sectional view of the corona discharge element of FIG. 3 taken along the line AA ′.

FIG. 5 is a diagram showing a comparison result of data obtained from the device of one embodiment and the conventional device.

FIG. 6 is a plan view of a corona discharge element according to another embodiment of the present invention.

7 is a cross-sectional view of the corona discharge element of FIG. 6 taken along the line BB ′.

[Explanation of symbols]

 21, 41 Substrate 23, 43 Insulation layer 25, 45 Induction electrode 27, 47 Discharge electrode 29, 49 Protective layer 31, 51 Discharge region 33 Region (region in which discharge is suppressed) 35 Protective layer thickening portion

Claims (4)

[Claims] 1. A corona discharge device comprising a corona discharge element for generating ozone and negative ions from the air by creeping corona discharge, wherein the corona discharge element extends in a direction transverse to an air flow.
A corona discharge device having a discharge region only in rows. 2. The corona discharge device according to claim 1, wherein the corona discharge element includes an insulating layer, an induction electrode provided on one surface of the insulating layer, and the insulating layer interposed between the induction electrode and the induction electrode. To face each other,
A discharge electrode provided on the other surface of the insulating layer, and a protective layer covering the discharge electrode, wherein
A corona comprising: a protective layer formed so that only one of the peripheral portions of the book is a discharge region, and the protective layer is thin in one peripheral region and thick in the other peripheral region. Discharge device. 3. The corona discharge device according to claim 1, wherein the corona discharge element includes an insulating layer, an induction electrode provided on one surface of the insulating layer, and the insulating layer with respect to the induction electrode. To face each other,
A discharge electrode provided on the other surface of the insulating layer, and the discharge electrode has one side so that only one of the two side edges serves as a discharge region. The corona discharge device, wherein an edge portion is formed so as to correspond to a portion where the induction electrode is present, and another edge portion is formed so as to correspond to a portion where the induction electrode is not present. 4. The corona discharge device according to claim 2 or 3, wherein the length of the discharge electrode in the direction along the edge is at least the length in the direction of the induction electrode along the edge. Corona discharge device characterized by being set to the same or longer.