WO1997008097A1

WO1997008097A1 - Ozone generating electric discharge apparatus

Info

Publication number: WO1997008097A1
Application number: PCT/JP1996/002367
Authority: WO
Inventors: Tadashi Hirotsune
Original assignee: Tadashi Hirotsune
Priority date: 1995-08-30
Filing date: 1996-08-26
Publication date: 1997-03-06
Also published as: AU7550196A; TW349074B

Abstract

One electrode, an insulator and a metal mesh as the other electrode are superposed on one another closely to form an ozone generating electric discharge apparatus in which a discharge voltage is applied between these electrodes. A structure comprising a plate type electrode, a plate type insulator and a planar metal mesh which are superposed on one another closely with a discharge voltage applied between the electrode plate and metal mesh, a structure in which a glass plate is used as the plate type insulator, a structure in which at least the surface of the glass plate which is on the side of the metal mesh is subjected to a water repellent treatment, or a structure placed in a casing, having rod electrodes connected to the electrodes and projecting to the outside of the casing, and provided with a suction port and an ozone discharge port in suitable portions of the walls constituting the casing is employed in some cases.

Description

Description Discharge device for ozone generation Technical field

The present invention relates to a discharge technique for generating ozone, which is capable of freely expanding a discharge area, extremely increasing ozone generation efficiency, and having a simple structure, easy maintenance, and low cost. The present invention relates to a technology capable of realizing a discharge device for generating ozone.

Background art

Ozone has a strong oxidizing power and is widely used for cleaning and deodorizing air in hospitals, bleaching wool and starch, and sterilizing drinking water. Various ozone generators that generate ozone using electric discharge or electrolysis have already been put into practical use.

Among them, one that is widely used for both industrial and consumer uses is one that uses discharge. How ozone is generated by the discharge, together with o _z is decomposed into o alone by the discharge energy in the air, in which the o is o ₂ and sintered combined and 0 _3. As shown in FIG. 6, a surface electrode 82 is provided on one main surface of the ceramic plate 80, and a deformed comb electrode 84 smaller than the surface electrode 82 is provided on the other main surface. The discharge device 86 provided with the above is used. Such a discharge device 86 applies a discharge voltage between two electrodes, and the periphery of the comb electrode 84 and the surface electrode 8

2 and a creeping discharge is performed.

However, such a conventional discharge device for ozone generation 86 has the following disadvantages: (1) its production cost is high; (2) its ozone generation efficiency is low; (3) it is difficult to increase the size of the discharge device 86; There are many problems such as

First, in case (1), when electrodes are provided on the ceramic plate 80, the electrodes must be formed by a method such as printing and metallization, and a special plate is required. Even so, it gets expensive. Next, with regard to ②, when a creeping discharge is generated in the above structure, the discharge mainly occurs between the tip of the comb in the comb-shaped electrode 84 and the surface electrode 82, and depends on the periphery of the comb-shaped electrode 84. appear. Therefore, since the area of the discharge part is inevitably smaller than the size of the discharge device 86, the ozone generation efficiency is also reduced.

For (3), the ceramic plate 80 is obtained by firing after pressing, and it is difficult to increase the size of the die during pressing. Therefore, the discharge device 86 is also easily increased in size. I can't.

When used in a humid environment, water vapor and ozone react with each other, and the amount of ozone generated is significantly reduced. Therefore, the problem (1) poses a problem in that the surface of the ceramic easily absorbs moisture and is sensitive to moisture. In order to prevent this, it is necessary to separately provide a heating means such as a heater for removing the adsorbed water, resulting in an increase in cost. Moreover, in general, when the temperature rises, the molecular motion is activated, so that the ozone generation efficiency is reduced. Therefore, if the effect of the moisture is prevented, the ozone generation efficiency is further reduced. Disclosure of the invention

The above problem can be solved by providing a discharge device for generating ozone in which one electrode, an insulator, and a metal mesh as the other electrode are superimposed and adhered, and a discharge voltage is applied between the two electrodes. Here, the plate-shaped electrode plate, the plate-shaped insulator, and the flat metal mesh are superimposed on each other, and a discharge voltage is applied between the electrode plate and the metal mesh. Or a structure in which at least the metal mesh surface is treated to be water-repellent, or an electrode rod that is housed inside the housing and connected to both electrodes protrudes out of the housing At the same time, it is also possible to adopt a configuration in which an intake port and an ozone exhaust port are provided at appropriate places on the wall constituting the housing. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an explanatory diagram showing a structural example of the discharge device for ozone generation of the present invention. FIG. 2 is an explanatory diagram showing a structural example in a case where the ozone generation discharge device of the present invention is housed in a housing.

FIG. 3 is an explanatory view showing a structure of a contact portion between an insulator and a metal mesh in the discharge device for ozone generation of the present invention.

FIG. 4 is an explanatory diagram showing an example of a circuit of an ozone generator using the discharge device for ozone generation of the present invention.

FIG. 5 is an explanatory diagram illustrating an example of a formation region of an intake port, a frame member, and an exhaust port.

FIG. 6 is an explanatory view showing the structure of a conventional discharge device for generating ozone. BEST MODE FOR CARRYING OUT THE INVENTION

In the discharge device for ozone generation of the present invention, for example, one plate-like electrode plate, an insulator plate of glass or the like having substantially the same size as the electrode plate, and the other electrode having the same size as these are also used. A metal mesh is superimposed and adhered, and a high discharge voltage is applied between both electrodes. Here, since the metal mesh is made by literally knitting fine metal wires in a vertical and horizontal mesh, the insulating plate and the metal mesh are in point contact with the convex portion formed by the intersection of the fine metal wires in the metal mesh. Will be. Since one metal mesh has countless protrusions, each of them corresponds to the tip of the needle electrode in the creeping discharge. Creepage discharge is a discharge phenomenon that develops around a needle electrode along the interface between different kinds of dielectrics, and in the present invention, the boundary between air and the insulator plate, that is, the surface of the insulator plate The discharge spreads around the convex part of each metal mesh along the shape of. Therefore, there are countless protrusions in the entire surface area of the insulator plate, and creeping discharge spreads around the point of contact between the metal thin wire and the insulator plate. The discharge surface from one intersection (convex portion) is connected to the discharge surface from another adjacent intersection (convex portion), and eventually a creeping discharge surface is obtained over the entire surface of the insulator plate. Will be done. In this way, in the present invention, since creeping discharge occurs on the entire surface of the insulator plate, the ozone generation efficiency is greatly improved as compared with the conventional discharge device 86. Here, as a material used for the electrode, stainless steel excellent in oxidation resistance is suitable. In addition, by housing such a discharge electrode using a metal mesh inside the housing, ozone can be generated more efficiently. Specifically, a discharge electrode using this metal mesh is housed in a container having a certain internal volume, and for example, air is supplied from a proper position on the lower surface of the housing, and the upper surface is opposed to the lower surface. The air supplied from is discharged from the outlet with a certain residence time in the housing. This prevents the active 0 single substance generated by the discharge from being ejected to the outside before being combined with o ₂ to become 0 _3, and O and 0 ₂ coexist in a closed space The purpose is to increase the ozone generation efficiency by securing time. In other words, if the supplied air is discharged to the outside without waiting for the residence time in the housing, only the simple substance will be discharged to the outside, and foreign matter floating in the outside air, and wall or furniture in the room reacts with the surface etc., because the reaction amount of 0 ₂ is reduced. In addition, the factor that greatly affects the ozone generation efficiency is the effect of water adsorbed on the insulator surface. To prevent this, it is conceivable to use a water-repellent material for the insulator itself or to perform a water-repellent treatment on the insulator surface. The former can be exemplified by the use of a fluororesin as the insulator, and the latter can be exemplified by applying a known water-repellent treatment such as a fluororesin coat using a sheet glass or the like as the insulator, for example. . Further, in the case of using a sheet glass as the insulator, it is also preferable to use a non-alkaline glass in order to reduce the influence of an alkali ion which exerts a shadow on water adsorption, for example. Such a water-repellent treatment can prevent moisture from adsorbing to the surface of the insulator and always provide a stable discharge state.

Furthermore, when this discharge electrode is housed inside the housing, a structure in which an electrode rod is projected outside the housing and the electrode rod and both electrodes are electrically connected can be exemplified. By adopting such a structure, the ozone generation discharge device of the present invention can be appropriately inserted into and removed from the inlet of the electrode rod. That is, if a plurality of such inlets are installed on, for example, a wall surface in a room or the like, the ozone generating discharge device of the present invention can be attached to a required location to generate ozone when needed. In addition, if an opening is provided in the housing of the power supply device for discharging, an ozone generating device can be configured in combination with the discharging device for generating ozone of the present invention. Striping, more specific embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an example of the structure of the discharge device 1 for generating ozone of the present invention. In the example shown in the figure, the plate-shaped electrode plate 3 is sandwiched between two glass plates 5, 5, and the entire surface of the flat metal mesh 7, 7 is brought into close contact with the surface of each plate glass 5, 5. The electrode plate 3, the glass plates 5, 5 and the metal meshes 7, 7 are superposed and adhered to each other, and a discharge device 1 for generating ozone is configured so that a discharge voltage is applied between the electrode plate 3 and the metal meshes 7, 7. is there. As shown in the figure, two corrugated plates 10 and 10 are mounted on a rectangular frame member 9 on a base 11, and the corrugated plates 10 and 10 form an electrode plate 3 and a plate glass. 5, 5, Metal meshes 7, 7 are sandwiched, and holding plate 9 a is held down by two screws 9 b, 9 b, making use of the elasticity of corrugated plates 10, 10 to make the electrode plate 3, the plate glass 5, 5 and the metal mesh 7, 7 are superimposed and adhered. By the combination of the holding plate 9a, the screw 9b, and the corrugated plate 10, the electrode plate 3 and the metal mesh 7 can be adjusted so as to be uniformly overlapped and adhered to the entire surface of the plate glass 5.

The electrode plate 3 is used as one electrode, and the glass sheets 5 and 5 are used as the other electrodes to form a structure in which a discharge voltage is applied between the one electrode and the other electrode. It has a structure with 13 attached. A housing 15 is formed by the base 11 and the lid 13. The lower surface of the housing 15, that is, the base 11, is provided with an air inlet 17, and the upper surface of the housing 15, that is, the lid 13, is provided with an ozone outlet 19. More specifically, a bifurcated lead wire 25 is soldered to the metal meshes 7, 7, and the lead wire 25 is protruded from the base 11. Soldered to. On the other hand, a lead wire 25 is also connected to the electrode plate 3, and this is soldered to another electrode rod 31 provided to protrude from the base 11. In addition, two electrode rods 33, 33 are provided separately from the electrode rods 27, 31, and these are connected by a lead wire 25. These four electrode rods 27, 31, 33, 33 are inserted into the insertion holes 39, 39, 41, 4 provided in the upper surface 37 of the housing of the power supply unit 35 for discharge. The ozone generation device 43 is configured together with the ozone generation discharge device 1 of the present invention. These two The electrode rods 33, 33 are designed to function as switches when inserted into the power supply unit 35, and the details will be described later in the circuit diagram. In addition, a blower port 45 is provided on the upper surface 37 of the housing of the power supply unit 35, and a breeze blown by a fan provided inside the power supply unit 35 flows from the intake port 17 to the outlet port 19. You are now passing through.

In such a configuration, as shown in FIG. 3, the creeping discharge spreads around a point contact point between the metal wire 7a and the sheet glass 5 at the intersection (projection 7b) of the metal wire 7a. The discharge surface from one intersection (convex portion 7 b) is connected to the discharge surface from another adjacent intersection (convex portion 7 b), and eventually the creeping discharge surface extends over the entire surface of the sheet glass 5. Is obtained. Furthermore, since air can pass through the gap c generated between the sheet glass 5 and the metal mesh 7, the ozone generation efficiency is further improved. In this way, in the present invention, since creeping discharge occurs on the entire surface of the insulator plate, the generation efficiency of ozone is greatly improved as compared with the conventional discharge device 86. Here, as the material used for the electrode, stainless steel having excellent oxidation resistance is suitable.

Also, depending on the selected composition, there are rare cases where the sheet glass 5 may be warped.However, when it is feared that the surface contact with the electrode plate 3 may become difficult, the sheet glass 5 may be used. A transparent conductive material such as tin oxide or indium tin oxide with high adhesive strength, or a metal film such as chromium is deposited on 5 and an electrode plate or mesh-shaped electrode is superimposed and adhered to the deposited surface. it can. In this way, the contact between the electrode (electrode plate) and the plate glass 5 can be made uniform over the entire surface.

Further, a cylindrical glass tube may be used in place of the plate glass 5, electrodes may be deposited on the inner peripheral surface thereof, and the metal mesh 7 may be wound on the outer peripheral surface. The use of such a cylindrical insulator makes it possible to secure a large discharge area while being small.

Subsequently, further details will be described together with a circuit example of the ozone generator 43 using the ozone generation discharge device 1 of the present invention.

FIG. 4 shows a circuit of an ozone generator 4S using the ozone generation discharge device 1 of the present invention. An example of a road is shown. The circuit shown in the figure is composed of a power supply section 51 composed of a transformer 47 and a power switch 49 with commercial power input, rectifies the power supply voltage transformed to an appropriate voltage, and rotates the fan 53. DC power supply 55, Oscillator 57 that obtains high-frequency voltage for discharge from output from DC power supply 55, High voltage generator that amplifies output from oscillator 57 to generate high voltage 5 is a circuit example of an ozone generator 43 in which a discharge device 1 for generating ozone of the present invention is attached to a power supply device 35 composed of 59. The details will be described below.

AC 100 V serving as a power supply is stepped down to an appropriate voltage by a transformer 47 and supplied to a DC power supply unit 55. In the DC power supply section 55, the supplied AC voltage is converted into a stable DC voltage by the rectifier 61, the smoothing coil 63, the smoothing capacitor 165, and the voltage regulator 67, and at the same time, the fan 53 Also supplied for rotation. The DC voltage obtained by the DC power supply unit 55 is supplied to the next oscillation unit 57, and a high-frequency voltage is generated for discharging. Here, the oscillator 57 is provided with a variable resistor 69 as an adjusting means for changing the oscillation frequency. The high-frequency voltage obtained by the oscillation unit 57 is sent to the next high-voltage generation unit 59, where it is boosted by Darlington amplification by the transistors 71 and 71. Is supplied to the high-voltage transformer 75 of the final stage having The output from the high-voltage transformer 75 is supplied to the inlets 39, 39 of the electrode rods provided on the upper surface 37 of the power supply unit 35, and the inserted electrode rods 27, 39 are provided. It is supplied to the discharge device 1 for ozone generation via 3 1.

On the other hand, one input of the rectifier 61 is also supplied to the inlets 41, 41 of the electrode rods provided on the housing upper surface 37 of the power supply 35, and short-circuited as shown in FIG. The power is supplied to the rectifier 61 by inserting the two electrode rods 33, 33 into the rectifier 61. Such a configuration is designed so that when the ozone generating discharge device 1 is pulled out while the power switch 49 is on, the electric shock is prevented from touching the high voltage supply inlets 3 S, 39 even if the hand is touched. It functions as When removing and inserting the ozone generating discharge device 1, the electrode rods 27, 31, 31, 33, 33 that are energized may be touched. Electrode when inserting and removing When the rods 27, 31, 31, 33, 33 come into contact with the inlets 39, 39, 41, 41, the electrode rods 27, 31, 31, 33, 33 should not be inserted. It is advisable to set the length or use a limit switch so that electricity is supplied when the discharge device 1 for ozone generation and the power supply device 35 are in close contact. However, in order to secure the mounting stability of the ozone generation discharge device 1, it is desirable to use four power rods 27, 31, 31, 33, 33 as shown in the figure. It is also effective to combine this with the limit. At this time, the limit switch may be provided between the insertion port 41 and the transformer 47 or the rectifier 61.

In the embodiment described above, the air supply port 45 of the power supply device 35, the intake port 17 on the housing 15 side, the frame member 9 corresponding to the discharge section, and the discharge port 19 are arranged at the overlapping position. Therefore, the air flow is linear. However, as described above, it is desirable that the air flowing from the intake port 17 be discharged from the discharge port 19 with a certain residence time inside the housing 15 of the discharge device 1 for ozone generation. With the arrangement shown in Fig. 5, it is possible to increase the residence time of the air. The dashed line in the figure indicates the area where the intake port 17 is formed, the dotted line indicates the frame member 9, and the dashed line indicates the area where the outlet port 19 is formed.The figure is a plan view of the housing 15. is there. As is clear from the figure, since the air sent from the air vent 45 in the power supply device 35 does not become linear, the residence time of the air in the housing 15 of the discharge device for ozone generation 1 is reduced. It can be taken for a long time. Thus, a single active 0 generated by the discharge, and prevented from being discharged to the outside before the coupling to 0 ₃ and 〇 _2, coexisting 0 0 ₂ and has a closed spatial within Time is secured and ozone generation efficiency can be further improved. In other words, depending on the air volume per unit time from the air outlet 45, the positional relationship between the inlet 17 and the frame member 9, the outlet 19, and the internal volume of the housing 15 of the ozone generating discharge device 1, 0 ₃ emissions per unit time from outlet 19 are determined.

As another way to regulate the discharge amount per unit time ₃ 〇 In the ozone generator 4 3 du one duty ratio of the high frequency voltage supplied to the ozone generating discharge device 1, change the frequency and voltage Other than this, the opening area of the outlet 19 is changed like a diaphragm of a camera, and the air flowing through the inlet 17 is inside the housing 15. May be able to increase or decrease the residence time.

In addition, as the discharge time elapses, there is almost no contamination on the electrode plate 3 side, but nitrogen compounds and the like adhere to the metal mesh 7, but are disassembled and cleaned during cleaning. It is only necessary to remove only 7 and wash it with water, or wash the entire discharge device 1 for ozone generation with water.

Finally, the evaluation results of the ozone generation efficiency of the discharge device for ozone generation 1 of the present invention will be described. As shown in Fig. 1, the experiment was performed on both sides of a 26 mm x 38 mm large electrode plate 3 with a 24 mm x 36 mm water-repellent treatment. 5 and a stainless steel mesh 7, 7 of the same size but with a fine wire diameter of 0.15 mm and a mesh opening of 1 mm x 1 mm Ozone was generated by applying an AC voltage of VZ40 kHz, and the amount of generated ozone and the power consumption at that time were measured. The supplied air had a flow rate of 50 liters per minute at 20 ° C and a humidity of 60%, and the ozone content was measured by a detector tube at the discharge port to be 78 ppm. Then, the amount of ozone generated per hour can be calculated as follows.

7 8 P P M X (50 liters / min X 60 minutes) X (48/29 X 1.2 Kg) = 4 65 mg / h

In the above equation, 48 is the molecular weight of ozone, 29 is the molecular weight of air, and 1.2 Kg is the specific gravity of air at 20 ° C. The power required to generate this ozone is 3.6 wh, and the amount of ozone generated per kwh is about 129 g. On the other hand, for comparison, an ozone generator already in practical use for a large water service was used. This is to supply oxygen using the electrolysis of water to the discharge part in order to increase the generation efficiency of ozone, and this is the highest generation rate per hour in current ozone generators. As a result of the measurement, it was confirmed that 35 _kg of ozone was generated per hour, and the power consumption at this time was 735 kwh. This included the power required for electrolysis of water, of which the amount of power required for discharging for ozone generation was 466 kwh.

And when the above ozone generation amount is converted per 1 kV / h, 35 K g ÷ 7 35 k W h = 47.6 g / lk W h.

Therefore, the conventional maximum efficiency device weighs 47.6 g, whereas the ozone generation discharge device 1 of the present invention weighs 12.9 g, which means that the efficiency is improved by about 2.7 times. . In addition, the effective amount rate of air passing through the metal meshes 7, 7 is a relatively low value of 20%, and if this effective amount rate is improved by structural measures such as providing an air flow path, ozone is further increased. It is clear that the generation efficiency is improved, and there is an outstanding effect that the efficiency is immeasurably higher than before. Industrial applicability

As described above, the discharge device for generating ozone of the present invention utilizes creeping discharge on the surface of an insulator and one of the electrodes is made of a metal mesh, so that thin metal wires intersect in the metal mesh. The discharge spreads around the projection. Therefore, there are numerous projections throughout the surface area of the insulator plate, and the creeping discharge spreads around the point contact between the intersection projection of the fine metal wires and the insulator plate. The discharge surface from the convex portion is connected to the discharge surface from another intersecting convex portion adjacent to the convex portion, so that a creeping discharge surface is obtained over the entire surface of the insulating plate. The ozone generation efficiency was greatly improved compared to the discharge device, and as a result, extremely significant power saving was achieved.

The materials used are, for example, sheet glass, metal electrode plates, and metal mesh.Since the size can be easily increased as required, the design of an ozone generation discharge device suitable for a wide range of uses from consumer use to industrial use. Becomes possible. Furthermore, since it is a general-purpose material, it can be easily procured from the city, and can be easily manufactured without special production equipment, so that the cost can be significantly reduced.

In addition, it is easy to impart water repellency to the surface of the insulator by selecting a material and performing post-treatment, so that adsorption of moisture can be prevented, so that the surface is not affected by moisture.

Furthermore, especially for metal meshes, the use of a material having excellent corrosion resistance, such as stainless steel, can greatly extend the service life. Also the metal mesh is dirty In such a case, only the metal mesh can be removed and washed with water, and the entire ozone generating discharge device can be washed with water. Therefore, even if the ozone generator is configured in combination with the power supply, the ozone generator discharge device of the present invention corresponds to the electrode portion of the conventional ozone generator, and can be inserted and removed as described above. Only the part functions as an easily removable ozone generator. In addition, as mentioned above, when the metal mesh is removed for cleaning or replacement and then reattached, the holding plate and screws and corrugated plate are combined so that the metal mesh can be attached and superimposed on the surface of the insulator. The adjustment can be made so that the electrode plate and the metal mesh are uniformly overlapped and adhered to the entire surface. Therefore, there is no discharge variation due to the variation of the distance between the electrodes, and the maintainability is greatly improved. Such an ozone generation discharge device of the present invention is low in cost and easy to maintain, and as can be seen from the above-described experimental results, a high ozone generation efficiency that has never been considered before can be achieved with extremely low power consumption. It is an innovative thing that can be obtained.

Claims

The scope of the claims

1. An ozone generating discharge device in which one electrode, an insulator and a metal mesh as the other electrode are superimposed and adhered to each other, and a discharge voltage is applied between both electrodes.

2. The ozone generating device according to claim 1, wherein the plate-shaped electrode plate, the plate-shaped insulator, and the planar metal mesh are overlapped and adhered to each other, and a discharge voltage is applied between the electrode plate and the metal mesh. Discharge device.

3. The discharge device for ozone generation according to claim 2, wherein the plate-shaped insulator is plate glass.

4. The discharge device for ozone generation according to claim 2, wherein a water repellent treatment is applied to at least a surface of the sheet glass on the metal mesh side.

5. The electrode rods housed inside the housing, the electrode rods connected to the two electrodes protruding out of the housing, and the air inlet and the ozone outlet are provided at appropriate places on the wall constituting the housing. 5. The discharge device for ozone generation according to any one of 1 to 4.