JP3855287B2 - Ozone generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ozone generator that generates ozone having a deodorizing and sterilizing action.
[0002]
[Prior art]
Ozone, which has a strong oxidizing power and is used as a deodorizing / disinfecting agent, is generally generated by using silent discharge, and various devices have been proposed for this purpose. As one of the generating apparatuses, an ozone generating apparatus having a structure as shown in FIG. 4 has been proposed (Japanese Patent Application No. 5-65494).
[0003]
As shown in the figure, this ozone generator stacks a plurality of plate-like electrodes 1 each having a dielectric film 6 in upper and lower stages and discharge gaps 3 between the electrodes 1 via frame-like spacers 2. Is provided with a stacked type reactor 4 in which is formed. Then, after the high voltage line V and the ground line A are alternately connected to the flat plate electrodes 1 constituting the reactor 4 so that the ground electrode and the high voltage electrode face each other, At the same time as discharge is performed, ozone is continuously generated from the source gas by passing an oxygen-containing source gas such as pure oxygen gas or air through each discharge gap 3. . In the figure, reference numeral 5 denotes a refrigerant flow path formed in each plate electrode 1 in order to flow a refrigerant such as cooling water or a cooling gas in order to prevent heating of the electrode due to discharge.
[0004]
[Problems to be solved by the invention]
Incidentally, the ozone generator having such a structure has the following disadvantages.
[0005]
1. First, since each discharge gap 3 is independent and the source gas flows through each discharge gap 3 as a flow path, the source gas is introduced into each source gas inlet 8 and ozone outlet 9 as shown in the figure. Since it is necessary to connect the piping 8a for supplying ozone and the piping 9a for taking out ozone by the substantially same number as the discharge gap 3, a large number of pipes and joints must be assembled, resulting in poor manufacturing efficiency. In addition, these pipes 8a and 9a, in particular, the pipe 9a on the ozone extraction side, require a large number of expensive resin products such as Teflon having excellent corrosion resistance against ozone, resulting in an increase in manufacturing component costs. There were drawbacks.
[0006]
2. In the conventional ozone generator, although the reactor 4 itself is temporarily covered with a casing (not shown) or the like, it is basically open to the atmosphere. The water inside is cooled by a coolant such as cooling water flowing in the plate electrode 1 and condensed on the surface of the reactor 4, which may cause leakage of the high voltage applied to the electrode 1.
[0007]
3. Further, as shown in the figure, each discharge gap 3 constituting the reactor 4 is provided with a spacer 2 such as a gasket positioned on the outer edge of each electrode 1 to form a partition, and the upper and lower press plates 7 and 7 and bolts and nuts. Since the airtightness is maintained by compressing from above and below by 7a, it is difficult to adjust the size to make the gap size and width uniform. There was an inconvenience of requiring.
[0008]
Accordingly, the present invention has been devised in order to effectively solve such problems, and its main purpose is to provide a novel ozone generator that is easy to manufacture and can be obtained at low cost. It is.
[0009]
[Means for Solving the Problems]
The first invention for solving the above problems, as well as laminating the flat plate electrodes above and below the multi-stage, the discharge gap to generate ozone between respective plate electrodes is partitioned form, the plate electrode located on the outermost upper and lower, Each of the raw material gas inlet or the ozone outlet is formed, and a communication hole is formed in each flat plate electrode positioned between the uppermost flat plate electrodes so as to communicate between the discharge gaps . each of the above raw material gas inlet and ozone outlet is made by connecting the source gas supply pipe and the ozone removing tube. Accordingly, all the discharge gaps in the reactor are all connected to form a single flow path, so that the number of necessary pipes and the fitting work of the joints are reduced, and the manufacturing becomes easy. Cost can also be kept low.
[0010]
In the second invention , the reactor itself is housed in a sealed container, and the raw material gas is supplied directly into the sealed container and used as a flow path for the raw material gas. By simply controlling the dew point of the raw material gas, dew condensation on the reactor surface can be prevented, and inconveniences such as high voltage leakage can be prevented beforehand.
[0011]
Further, in the third invention , since the frame-shaped ceramic spacer is used in place of the conventional gasket in order to form the discharge gap of the reaction vessel, the size of the discharge gap by compression as in the prior art is used. No adjustment is required, and a high-accuracy reactor can be easily obtained. Furthermore, since this spacer and the flat plate electrodes are joined with a low-temperature firing type inorganic adhesive at 200 ° C. or lower, the airtightness of the discharge gap can be easily and reliably obtained. Can be held.
[0012]
In the fourth aspect of the invention , as in the prior art , each plate electrode can be directly cooled by forming a cooling water passage for flowing cooling water or a cooling air passage for flowing cooling air. Therefore, it is possible to prevent the ozone generation rate from decreasing due to heat generation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described.
[0014]
FIG. 1 is a block diagram showing an embodiment of an ozone generator according to the present invention.
[0015]
First, reference numeral 4 in the figure denotes a reactor constituting the apparatus of the present invention. This reactor 4 is formed by laminating a plurality of flat plate electrodes 1 and 1 in a plurality of upper and lower stages, and a resin gasket between the flat plate electrodes 1 and 1. A discharge gap 3 is defined by a frame-shaped spacer 2 made up of, for example. Further, the dielectric film 6 is coated formed on the surface of the respective plate electrodes 1,1, the high and the ground electrode are connected alternately to the ground wire A and the high-voltage electric wire V to each plate electrodes 1,1 The voltage electrodes are alternately formed, and a discharge is generated in the discharge gap 3 by applying a high voltage between the ground electrode and the high voltage electrode.
[0016]
The flat plate electrode 1 positioned at the uppermost part is connected to a raw material gas inlet 8 that is connected from the side surface to the lower surface side and connected to a raw material gas supply pipe 8a for supplying the raw material gas, The reactor 4 is configured to supply a source gas to the discharge gap 3 side located on the lower surface of the flat plate electrode 1 . On the other hand, an ozone outlet 9 communicating from the outer side to the upper surface side of the flat plate electrode 1 located at the bottom of the reaction vessel 4 is also perforated, and an ozone extraction pipe 9a for taking out ozone is connected. The gas on the discharge gap 3 side located on the lower surface of the plate electrode 1 is taken out of the reactor 4. Further, each plate electrode 1,... Between these uppermost plate electrodes 1, 1 is provided with communication holes 10 penetrating up and down alternately in the vicinity of the diagonal of each plate electrode 1. The discharge gaps 3, 3 positioned above and below the respective plate electrodes 1,...
Therefore, the source gas supplied from the source gas supply pipe 8a to the source gas inlet 8 side flows downward to meander through the discharge gaps 3 as shown by the arrows in the drawing without staying, and then flows to the bottom. It passes through the ozone outlet 9 formed in the plate electrode 1 positioned and flows out of the reactor 4 from the ozone extraction pipe 9a. Here, the source gas used in the apparatus of the present invention refers to a gas containing oxygen that is a raw material for ozone such as pure oxygen gas or air, and is not particularly limited. Further, since the effect of the present invention can be obtained if the number of laminated plate electrodes 1 is at least 3 or more, the number, the number, the shape, the plate thickness, etc. are not particularly limited if the number is 3 or more. Absent. Furthermore, the material constituting the plate electrode 1 is not particularly limited as long as it has conductivity, but for example, a good conductor alone such as iron, copper, aluminum, or an alloy thereof, Suitable for workability and cost.
[0017]
In such a state, as described above, a high voltage is applied between the flat plate electrodes 1 and 1 to generate a discharge in the discharge gap 3, so that the source gas flowing in the discharge gap 3 gradually increases. It is converted into ozone and is taken out from the ozone extraction pipe 9a.
[0018]
As described above, since the present invention is such that the communication holes 10 are formed in the respective plate electrodes 1 and the adjacent discharge gaps 3 are communicated to sequentially flow the source gas, thereby greatly reducing the number of source gas flow paths. can do. That is, in this embodiment, since the flow path of the raw material gas is one, the number of the raw material gas supply pipe 8a for supplying the raw material gas to this and the number of the ozone extraction pipes 9a for taking out ozone are one each. . Accordingly, the structure is simpler than the conventional one, and the manufacturing efficiency of the entire apparatus is increased. At the same time, it is not necessary to use many expensive pipes, and the manufacturing cost can be reduced. In the figure, 7 and 7 are pressing plates for fixing the reactor 4, and 5 is a refrigerant flow path for flowing cooling water and cooling gas for preventing the heating of the plate electrode 1 due to discharge. The structure is not particularly different from the conventional one.
[0019]
Next, FIG. 2 shows a second embodiment of the present invention, in which a hard ceramic material is used as a material for the spacer 2 for partitioning the discharge gap 3, and the spacer 2 and its upper and lower positions are used. The flat plate electrodes 1 and 1 to be bonded together are bonded at a low temperature firing type inorganic adhesive 12 of 200 ° C. or lower. That is, as described above, in a conventional reactor, a relatively flexible material such as a resin-based gasket is used as a spacer, and the gasket is crushed by compressing it with the presser plates 7 and 7, and the repulsion thereof. Although the airtightness of the discharge gap 3 is maintained by force, such a method has a disadvantage that it is difficult to balance the airtightness and the interval between the discharge gaps 3. Furthermore, when a resin-based gasket such as PTFE is used, the gasket itself is eroded by electric discharge, so the frequency of replacement (maintenance) increases. Therefore, in this embodiment, since the ceramic material having the characteristics of high durability and high hardness is used as the spacer 2, it is not necessary to adjust the dimensions of the discharge gap 3 and a highly accurate reactor can be easily obtained. In addition, it is possible to reduce the frequency of maintenance accompanying deterioration due to discharge. The ceramic spacer and the flat plate electrode are bonded to each other with a low-temperature firing type inorganic adhesive 12 of 200 ° C. or less, so that the airtightness of the discharge gap 3 can be easily and reliably maintained. Specifically, the low-temperature firing type inorganic adhesive as described above is made into a paste and applied to the joint, and then heated, whereby it is possible to maintain airtightness together with adhesion.
[0020]
Next, FIG. 3 shows a third embodiment of the present invention. As shown in the figure, this embodiment accommodates the entire reactor 4 having the above-described configuration in a sealed container 11 and directly connects a source gas supply pipe 8a for supplying a source gas to the partition wall of the sealed container 11. Thus, the inside of the sealed container 11 is used as a raw material gas passage, and by this, only the dew point of the raw material gas is managed, so that dew condensation on the surface of the reactor 4 is prevented and inconveniences such as high voltage leakage are caused. It can be prevented beforehand. That is, in the conventional apparatus, although the reactor 4 may be accommodated in a casing or the like, the reactor 4 is basically open to the atmosphere and exposed to the atmosphere. When this is used, the moisture in the atmosphere is cooled by a coolant such as cooling water flowing in the plate electrode 1 to cause condensation on the surface of the plate electrode 1, and a high voltage applied to the electrode from this condensation portion. However, if the entire reactor 4 is accommodated in the sealed container 11 and the raw material gas is supplied directly into the sealed container 11 as in this embodiment, the dew point of this raw material gas is controlled in advance. As long as this is done, leakage due to condensation does not occur in any wet atmosphere, and it can be used safely. In particular, in this embodiment, when a refrigerant having a low dew point, for example, a refrigerant having a low dew point such as ammonia or chlorofluorocarbon, is used as the refrigerant for cooling the flat plate electrode 1, the effect appears remarkably. In general, since the source gas used in such an ozone generator has a dew point of −50 ° C. or lower, there is no need to further adjust the source gas dew point in normal use. In addition, by adopting such a configuration, even if the airtightness in the reactor 4 is reduced and internal high-concentration ozone leaks out, it does not diffuse into the atmosphere, and high safety can be maintained. It becomes possible.
[0021]
Further, since the internal pressure of the sealed container and the internal pressure of the discharge gap are the same, the airtightness of the discharge gap can be easily maintained.
[0022]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
[0023]
1. First, since the communication holes are formed in the electrodes sandwiched between the uppermost flat plate electrodes among the flat plate electrodes constituting the reactor, the number of necessary pipes and joints can be greatly reduced. . Therefore, the time required for the pipe assembly is shortened to increase the production efficiency, and the number of expensive pipes is reduced to greatly reduce the production cost.
[0024]
2. As a spacer for forming the discharge gap, a ceramic one is used, and this is joined to the flat plate electrode side with a low-temperature firing type inorganic adhesive of 200 ° C. or less, so that the discharge gap can be easily adjusted in size, and high-precision and high-quality. The reactor can be easily obtained.
[0025]
3. Since the entire reactor is placed in a sealed container and the raw material gas is allowed to flow directly into the sealed container, high-voltage short-circuit accidents due to condensation on the sealed container can be prevented even when used in a humid atmosphere. At the same time, even if high-concentration ozone in the reactor leaks out, it does not diffuse into the atmosphere as it is, and reliability and safety are guaranteed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of an ozone generator according to the present invention.
FIG. 2 is a block diagram showing a second embodiment of the ozone generator according to the present invention.
FIG. 3 is a block diagram showing a third embodiment of the ozone generator according to the present invention.
FIG. 4 is a configuration diagram showing an example of a conventional ozone generator.
[Explanation of symbols]
1 Plate electrode 2 Spacer 3 Discharge gap 4 Reactor 5 Refrigerant flow path 8 Source gas inlet
8a Raw material gas supply pipe 9 Ozone outlet
9a Ozone extraction pipe
10 communication hole
11 Airtight container

Claims (4)

The plate electrodes are laminated in multiple upper and lower stages, a discharge gap is defined between the plate electrodes to generate ozone, and a raw material gas inlet or an ozone outlet is formed in the plate electrode located at the lowermost position. Each flat plate electrode located between the uppermost flat plate electrodes is formed with a communication hole to communicate between the discharge gaps, and a reactor is configured. The raw material gas is supplied to the raw material gas inlet and the ozone outlet of the reactor , respectively. An ozone generator characterized by connecting a tube and an ozone extraction tube. The reaction vessel according to claim 1 is accommodated in a closed vessel, and a raw material gas supply pipe for supplying a raw material gas is connected to the closed vessel, and an ozone extraction pipe for taking out ozone at the ozone outlet of the reactor is provided with a closed vessel. An ozone generator characterized by being penetrated and connected. In order to partition the discharge gap of the reaction vessel, a frame-shaped ceramic spacer is interposed between the flat plate electrodes, and the spacer and the flat plate electrodes are joined to each other with a low-temperature firing type inorganic adhesive of 200 ° C. or less. The ozone generator of Claim 1 or 2 characterized by these . The ozone generator according to any one of claims 1 to 3, wherein a cooling water passage for flowing cooling water or a cooling air passage for flowing cooling air is formed in each of the plate electrodes .

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