Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Reexamination Certificate
1998-11-09
2001-09-04
Gorgos, Kathryn (Department: 1741)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
C422S186070, C422S186120, C264S510000
Reexamination Certificate
active
06284203
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a discharge cell used for a plate-type ozonizer and its manufacturing method.
2. Discussion of the Background
FIG. 8
shows a conventional discharge cell used for a plate-type ozonizer. The discharge cell includes a planar high-voltage electrode
1
and a planar ground electrode
2
arranged so as to face each other at a predetermined interval. Dielectrics
3
and
3
′ are formed on the facing surfaces of the high-voltage electrode
1
and ground electrode
2
by means of coating. Moreover, a spacer
5
is set between the dielectrics
3
and
3
′ to form a discharge space
4
having a predetermined gap.
In addition, heat sinks
6
and
7
are included in close contact on the outside of the high-voltage electrode
1
and ground electrode
2
. The heat sink
6
at the high-voltage electrode
1
is connected with a high-voltage terminal of a high-voltage power supply
8
and the heat sink
7
at the ground electrode
2
is ground together with a ground terminal of the high-voltage power supply
8
.
To produce ozone, a high voltage is applied between the high-voltage electrode
1
and the ground electrode
2
by the high-voltage power supply
8
connected to the beat sinks
6
and
7
. Thus, a silent discharge is generated in the discharge space
4
between the dielectrics
3
and
3
′. By circulating a material gas, such as an oxygen gas or air through the discharge space
4
under the above state, some of the material gas is exposed to the silent discharge and ozonized.
A plate-type ozonizer frequently uses a plurality of the above-mentioned discharge cells by using each discharge cell as one module and superimposing the discharge cells in a thickness direction.
However, the above conventional ozonizer discharge cell has the following problems.
To form the discharge space
4
having the predetermined gap between the dielectrics
3
and
3
′, the spacer
5
is set between the dielectrics
3
and
3
′. The spacer
5
includes an elastic silicon sheet to protect the dielectrics
3
and
3
′ from a tightening force when superimposing a plurality of discharge cells. This is because, if the spacer
5
is hard, the dielectrics
3
and
3
′ may be broken due to the force produced when a plurality of discharge cells are superimposed and tightened.
In addition, ozone has an oxidation capacity similar to that of fluorine among natural oxidizing agents. Therefore, even though a silicon sheet is superior in oxidation resistance, the silicon sheet is unavoidably changed in properties or deteriorated in quality due to the oxidation capacity after exposure to ozone for a long time. Thus, a conventional discharge cell has a durability problem.
In addition, the spacer
5
is bonded to the dielectrics
3
and
3
′ by an adhesive to secure an airtightness of the discharge space
4
. However, because the bonding force is not large, a pressure of a material gas circulating through the discharge space
4
is limited.
Further, the high-voltage electrode
1
and ground electrode
2
produce heat from the discharge energy of the generated silent discharge. This heat causes a lower ozone producing efficiency because the heat accelerates a dissolution of produced ozone. To improve the above problem, the heat sinks
6
and
7
are placed directly on the high-voltage electrode
1
and ground electrode
2
or are placed on the electrodes
1
and
2
through a sheet, such as an aluminum foil which is superior in heat conductivity.
In this case, the heat sink
7
at the ground electrode
2
is a water-cooled type having a high cooling efficiency. In addition, the heat sink
6
at the high-voltage electrode
1
is an air-cooled type to prevent a short circuit due to cooling water having a low insulation resistivity. However, the air-cooled type heat sink is inferior to the water-cooled type in cooling efficiency. Therefore, in the case of a conventional discharge cell, the ozone producing efficiency is unavoidably lowered.
Moreover, the heat sinks
6
and
7
are large compared to other component members and the air-cooled-type heat sink
6
is particularly large. Therefore, it is difficult to reduce a size of a discharge cell.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide an ozonizer discharge cell superior in durability.
Another object of the present invention is to provide an ozonizer which uses a high material-gas pressure. Yet another object of the present invention is to provide an ozonizer which is compact and has a high ozone producing efficiency.
Still another object of the present invention is to provide a novel manufacturing method for producing an ozonizer discharge cell.
To achieve the above-mentioned objects, a plate-type-ozonizer discharge cell includes a pair of planar electrodes separated by a dielectric to ozonize a material gas circulating through a discharge space formed between one of the planar electrodes and the dielectric by means of discharge. In addition, the dielectric includes at least one ceramic block having a plurality of ceramic layers integrally superimposed on each other in a layer thickness direction. In addition, the method of manufacturing an ozonizer discharge cell, includes providing a plurality of ceramic sheets to be baked, and superimposing the ceramic sheets in a layer thickness direction. Then the plurality of ceramic layers are baked so as to form a ceramic block.
Specifically, as shown in
FIGS. 3
to
5
, an ozonizer discharge cell of the present invention includes a ceramic block
10
formed by integrally superimposing a plurality of ceramic layers
11
,
12
, etc., in a thickness layer direction. A discharge space
20
is formed between two ceramic layers
12
and
14
at both sides of an intermediate ceramic layer
13
. The intermediate layer
13
serves as a spacer in the ceramic block
10
. In addition, two planar electrodes
30
and
30
′ are formed at both sides of the discharge space
20
at the anti-void side (i.e., a side facing opposite to the discharge space) ofthe two ceramic layers
12
and
14
. The planar electrodes
30
and
30
′ are respectively sealed between adjacent ceramic layers
11
and
12
and between adjacent ceramic layers
14
and
15
.
For the discharge cell shown in
FIGS. 3
to
5
, the ceramic layers
12
and
14
facing the discharge space
20
function as dielectrics, thereby discharge occurs in the discharge space
20
. Thus, some of a material gas circulating through the discharge space
20
is ozonized. In this case, the intermediate ceramic layer
13
serves as a spacer and forms the discharge space
20
. Therefore, even if the spacer is exposed to ozone for a long time, the spacer is not changed in properties or deteriorated in quality.
Because the pair of ceramic layers
12
and
14
at both sides of the intermediate ceramic layer
13
are integrated by being superimposed with the intermediate ceramic layer
13
and other ceramic layers, a thickness of the ceramic material at a tightening portion increases. Therefore, even though the spacer is made with a hard ceramic layer
13
, the ceramic layers
12
and
14
, as well as other ceramic layers including the ceramic layer
13
, are not broken even if the tightening force is increased. Accordingly, an ozonizer discharge cell of the present invention is superior in durability.
Moreover, because the ceramic layers
12
,
13
and
14
are integrated, the discharge space
20
formed between the ceramic layers
12
and
14
is superior in airtightness. Therefore, it is also possible to use a high material-gas pressure.
In addition, the planar electrodes
30
and
30
′ are cooled because a ceramic layer serves as an electric insulating layer. Moreover, similarly to the case of the discharge space
20
, a thin coolant circulation route
40
is formed by using a ceramic layer as a spacer. Therefore, efficient cooling at the high-voltage electrode side may be achieved using water. Further, this cooli
Shimoda Kyoji
Tokutake Shigekazu
Gorgos Kathryn
Maisano J.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sumitomo Precision Products Co. Ltd.
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