Discharge cell for generating ozone

Abstract

The discharge ozone generating cell has first and second electrode substrates separated by a non-conductive flat spacer plate. An electrode plate in intimate contact with the first electrode substrate is fitted into a central opening in the spacer plate. The second electrode substrate and a dielectric plate in intimate contact with the spacer plate, together with the inner edge of the spacer plate and the electrode plate, serve to define a gas discharge chamber. Gaskets spaced from the inner edge of the spacer plate around the central opening on both sides of the spacer plate ensure a gas-tight seal within the discharge chamber.

Description

Technical Field

[0001] The present invention relates to a discharge cell, and more particularly, to a discharge cell for generating ozone.

Background Art

[0002] Ozone has many uses including waste and water treatment, disinfection, cleaning, odor removal, pest control, and sterilization. Therefore, many ozone generation systems are very large, such as those for municipal waste and water treatment plants, while other ozone generation systems are small, such as those for small-scale industrial and household applications.

[0003] In a typical ozone generation system, a source of raw gas supplies the raw gas to an ozone generation cell via a flow controller. In addition to oxygen, the raw gas can be ambient air or oxygen-enriched air. Energy is supplied to the cell by a power source to generate ozone for an application process.

[0004] The ozone generation cell can operate in many ways, including the generation of ozone by using a discharge (also called a corona discharge) to ionize oxygen. The present invention uses such a discharge in the ozone generation cell. However, there are many problems with ozone and its generation. Since ozone is highly corrosive, problems arise in the selection of materials and the cost of materials resistant to ozone. Corroded elements in the generation cell need to be replaced from time to time. Therefore, the ozone generation cell needs to be easily repairable and / or the corroded elements need to be easily replaceable. The generation cell also needs to be designed to optimally generate ozone at a relatively low cost.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention relates to a discharge ozone generation cell that addresses these problems. The ozone generation cell has relatively low-cost components that are easy to replace and repair, and are easy to assemble and disassemble. The discharge chamber of the cell is designed for high output of ozone.

Means for Solving the Problems

[0006] The present invention provides a discharge ozone generation cell, which includes a non-conductive spacer plate that separates a first and a second electrode substrate, the spacer plate having two side surfaces and an inner edge that define a central opening of the spacer plate; an electrode plate that is in contact with the first electrode substrate and is fitted into the central opening of the spacer plate; a dielectric plate that is in contact with the second electrode substrate and the spacer plate, and the dielectric plate, the inner edge of the spacer plate, and the electrode plate define a gas discharge chamber; and gaskets that are around the central opening on both sides of the spacer plate and are spaced from the inner edge of the spacer plate, and the gaskets ensure gas tightness of the discharge chamber while reducing exposure of the plasma and ozone in the discharge chamber.

[0007] The present invention also provides a discharge ozone generation cell, which includes a non-conductive spacer plate that separates a first and a second electrode substrate, the spacer plate having two side surfaces and an inner edge that define a central opening of the spacer plate; an electrode plate that is in close contact with the first electrode substrate and is fitted into the central opening of the spacer plate; a dielectric plate that is in close contact with the second electrode substrate and the spacer plate, and the dielectric plate, the inner edge of the spacer plate, and the electrode plate define a gas discharge chamber; and gaskets that are around the central opening on both sides of the spacer plate for ensuring gas tightness of the discharge chamber. The spacer plate has a first predetermined thickness, the electrode plate has a second predetermined thickness, the dielectric plate has a third predetermined thickness, and the difference between the first predetermined thickness and the sum of the second and third predetermined thicknesses forms the discharge chamber together with the inner edge of the spacer plate.

[0008] The present invention also provides a discharge ozone generation cell, which includes a non-conductive spacer plate separating a first and a second electrode substrate, the spacer plate having two side surfaces and an inner edge defining a central opening of the spacer plate; an electrode plate in close contact with the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate and including an anodized aluminum electrode plate; a dielectric plate in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate and the electrode plate defining a gas discharge chamber; and gaskets disposed around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, the gaskets ensuring gas tightness of the discharge chamber while reducing exposure of ozone in the discharge chamber. The anodized aluminum electrode plate is preferably injected with PTFE.

[0009] The present invention also provides a discharge ozone generation cell, which includes a non-conductive flat spacer plate separating a first and a second electrode substrate, the spacer plate having two side surfaces and an inner edge defining a central opening of the spacer plate; a flat electrode plate in close contact with the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate; a flat dielectric plate in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate and the electrode plate defining a gas discharge chamber; gaskets disposed around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, the gaskets ensuring gas tightness of the discharge chamber while reducing exposure of ozone in the discharge chamber; and a clamp configuration engaging around the first and the second electrode substrates via the spacer plate, whereby the flat spacer plate, the flat electrode plate, the flat dielectric plate, and the gaskets are joined together between the first electrode substrate and the second electrode substrate with minimal distortion.

[0010] The present invention further provides a discharge ozone generation cell, which includes a non-conductive spacer plate separating a first and a second electrode substrate, the spacer plate having two side surfaces and an inner edge defining a central opening of the spacer plate; an electrode plate in close contact with the surface of the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate; a dielectric plate in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate, and the electrode plate defining a gas discharge chamber, the gas discharge chamber having two opposing ends, and the inner edge of the central opening being offset from the electrode plate at the two opposing ends; and a channel along the surface of the first electrode substrate at each of the two opposing ends of the gas discharge chamber, the channel being connected to gas input and output terminals via the first electrode substrate, and the inner edge of the central opening being offset from the electrode plate at the two opposing ends such that the channel is exposed to the gas discharge chamber. Thereby, the channel forms a manifold for the input and output of gas to and from the gas discharge chamber.

[0011] Other objects, features, and advantages of the present invention will become apparent upon consideration of the following detailed description and the accompanying drawings. In the accompanying drawings, like reference numerals represent like features throughout the drawings.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Embodiments for Carrying Out the Invention

[0013] It should be understood that the drawings are for the purpose of enabling the reader to understand and are not necessarily drawn to scale.

[0014] A perspective view of the assembled discharge ozone generation cell 10 is shown in FIG. 1. The cell 10 includes an upper heat sink and electrode substrate 11, and a lower heat sink and electrode substrate 16 on both sides of a flat non-conductive spacer plate 14. The spacer plate 14 is preferably formed from polycarbonate or other suitable plastic. Each substrate 11 and 16 has an integral structure having a plane facing the spacer plate 14 and cooling fins 12 on the opposite side of the plane. During operation, air is blown over the cell 10 and the cooling fins 12 lower the temperature of the cell 10. The electrode substrates 11 and 16 are connected to a power source that provides a high AC voltage potential between the plate 11 and the plate 16. The thickness of the insulating spacer plate 14 prevents conduction between the plate 11 and the plate 16. Note that the terms "upper" and "lower" used with reference to the drawings are used for the benefit of the reader. In operation, the ozone generation corona discharge cell 10 is operable regardless of orientation.

[0015] Figures 2A and 2B are side views of the assembled ozone generating corona discharge cell 10. Figure 2A is a view parallel to the direction of the cooling fins 12, and Figure 2B is a view perpendicular to the direction of the cooling fins 12. These side views show the respective planes of the electrode substrates 11 and 16 with the spacer plate 14 sandwiched therebetween. The non-conductive fasteners 13 couple the plates 11 and 16 to the spacer plate 14. There are gas inlets / outlets 23 and 24 on the lower heat sink and the electrode substrate 16, which will be described in more detail below.

[0016] Figure 3 is an exploded side view of the discharge ozone generating cell 10, showing many of the main elements of the cell in addition to the upper heat sink and the electrode substrate 11, the lower heat sink and the electrode substrate 16, and the spacer plate 14. Elastic O-ring gaskets 42 and a dielectric plate 25 are disposed between the upper substrate 11 and the spacer plate 14. Elastic O-ring gaskets 45 and electrode plates 21 are disposed between the lower substrate 16 and the spacer plate 14. The spacer plate 14 has a central opening (not shown), and the O-ring gaskets 42 and 45 help form an airtight seal by surrounding the openings around both sides of the spacer plate 14. The central opening of the spacer plate 14, the dielectric plate 25 and the electrode plates 21 mainly define the discharge chamber where ozone is generated.

[0017] Figure 4 is an exploded perspective view of the cell 10 with the electrode substrates 11 and 16 spaced apart from the spacer plate 14. The non-conductive fastener 13 is shown in detail as a threaded rod 13C formed of a glass fiber reinforced plastic. The rod 13C engages socket head screws 13A and 13B at both ends of the rod. The non-conductive screws 13A and 13B are likewise formed from a glass fiber reinforced plastic. Other possible configurations include nuts and bolts for the fastener 13. The fastener 13, more precisely the rod 13C, passes through holes 33 located around the spacer plate 14 and also through holes 31 and 30 around the upper and lower heat sinks and the electrode substrates 11, 16 respectively.

[0018] There is a recess 41 around the central opening 40 of the spacer plate 14, and a dielectric plate 25 (see FIG. 3) fits into the recess 41 by contacting the upper heat sink and the electrode substrate 11. The O-ring gasket 42 fits into the groove 43, and this groove 43 surrounds the central opening 40, and only the corners of the central opening 40 are shown in the detailed view of FIG. 5A. FIG. 5B shows a groove 46 for the O-ring gasket 45 surrounding the central opening 40. The O-ring gasket 45 and the groove 46 are on the side of the spacer plate 14 facing the lower heat sink and the electrode substrate 16. Both gaskets 42 and 45 are adhered to the corresponding grooves 43 and 46 of the gaskets 42 and 45 before the final assembly of the cell 10. The gaskets 42 and 45 are formed from a suitable elastic material, preferably from the family of fluoroelastomers such as FKM, Viton® O-rings. Viton® is a registered trademark of The Chemours Company in Wilmington, Delaware.

[0019] The flat electrode plate 21 fits within the central opening 40 of the spacer plate 14 when the cell 10 is assembled. The plate 21 is preferably anodized aluminum injected with PTFE (polytetrafluoroethylene, or generally Teflon® which is a registered trademark of The Chemours Company in Wilmington, Delaware) to withstand ozone corrosion. The plate 21 may also simply be anodized aluminum or may be composed of various sandwiches of conductive materials including high chromium steel such as stainless steel, titanium, or alumina bonded to a conductive carrier. The plate 21 is attached by a plurality of screws 33 to be in close contact with the planes of the lower heat sink and the electrode substrate 16. The screws 33 are blind tapped into the plate 21 through holes 35 in the lower substrate 16. Alternatively, the screws 33 may also be through tapped the plate 21. The screws 33 can be flat head screws tapped into the lower electrode substrate 16 either by blind tap or through tap. Or, the plate 21 may simply be bonded to the lower electrode substrate 16. Preferably, the screws 33 have an O-ring seal or washer seal under their heads. In either case, the plate 21 is attached to the lower electrode substrate 16 so as not to allow gas leakage from the inside to the outside of the cell 10.

[0020] As shown in FIG. 4, channels 36 and 37 along the planes of the lower heat sink and the electrode substrate 16 form a manifold for the source gas to enter the discharge chamber of the cell 10 (shown in FIG. 5B) and for the ozone and unconsumed gas produced in the discharge chamber to exit the discharge chamber. The gas manifold channels 36 and 37 are respectively connected to the gas inlet / outlet 24 and the gas inlet / outlet 23 through the electrode substrate 16 through holes 38 and 39 at the bottoms of the respective manifold channels 36, 37. In FIG. 2A, the gas inlet / outlets 24 and 23 are shown adjacent to each other, while as is apparent in FIG. 4, the gas inlet / outlets 24 and 23 are spaced apart from each other.

[0021] The flat dielectric plate 25 is formed of alumina ceramic. As is well known, the dielectric plate serves to supply a discharge to the narrow gap of the discharge chamber. Without the supply of the discharge, an electric arc is established at a specific location, hardly generating ozone and damaging the generating cell.

[0022] As described above, the dielectric plate 25 fits into the recess 41 when the cell 10 is assembled. From the difference in the thickness of the spacer plate 14 and the total thickness of the electrode plate 21 and the dielectric plate 25, the discharge chamber 50 is formed by the edges of the central openings 40 of the dielectric plate 25, the electrode plate 21, and the spacer plate 14. A side view of the discharge chamber space 50 is shown in FIG. 6A. The gap between the dielectric plate 25 and the electrode plate 21 is narrow, and for optimal discharge and ozone generation, the range of the gap is (10 to 30)×10-3 inches. The source gas is introduced into the discharge chamber 50 through one of the manifold channels 36, 37. The potential difference between the electrode plate 21 and the dielectric plate 25 provides the conditions for the discharge in the discharge chamber 50. The source gas is introduced into the discharge chamber 50 through one of the manifold channels 36, 37, and the resulting ozone and the remaining source gas are removed through the other of the manifolds 37, 36. The top view of FIG. 6B shows that the gas manifold channels 36 and 37 are parallel to the electrode plate 21 and are arranged at both ends of the electrode plate 21 of the assembled cell 10. The gas manifold channels 36 and 37 distribute the source gas through the discharge chamber 50 for optimal ozone generation.

[0023] The potential difference, i.e., voltage, in ozone generation is high, and care is taken to avoid undesirable electrical short circuits. As shown in the detailed view of FIG. 7A, the upper and lower heat sinks and the holes 31 and 30 in the planes of the electrode substrates 11 and 16 are chamfered respectively. As described above, together with the hole 33 of the spacer plate 14, the holes 31 and 30 receive the fastening bar 13C for clamping the cell assembly. By chamfering the holes 31 and 30, the distance between the electrode substrates 11 and 16 passing through the holes 33, 31 and 30 increases. When the distance increases, the possibility of undesirable discharge between the electrode plates 11 and 16 is reduced. Further, the insulating spacer plate 14 is made larger laterally than the electrode substrates 11 and 16. This enables a thinner spacer plate 14. As shown in the side view of FIG. 7B, the extended spacer plate 14 increases the distance between the conductive upper and lower heat sinks and the electrode substrates 11 and 16, and further prevents short circuits around the edges of the assembly.

[0024] It should be noted that the main structural elements of the cell 10 are flat or conform to a plane. This makes the elements simple and easy to manufacture. For example, even the upper and lower substrate elements 11 and 16 are essentially a combination of flat bases 11A, 16A and cooling fins 13. Although it is preferable to construct the heat sinks and the electrode substrates 11 and 16 as a single part by either machining or extrusion, these elements 11 and 16 can also be constructed as separate heat sinks and electrode substrates. The dotted lines in FIGS. 2A and 2B show a method of creating each substrate element 11 and 16 from two separate parts, i.e., a substrate 11A and 16A having a plane and a cooling fin subassembly 13, and these can be joined to form the heat sinks and the electrode substrates 11 and 16. Therefore, there are multiple ways to do this, which will be obvious to those skilled in the art. Even if alternative methods are used, the spirit of the present invention will not change.

[0025] The flat element can clamp the cell 10 together with the spacer plates 14 around the electrode substrates 11 and 16. With such a configuration, the assembly and disassembly of the cell 10 become easy. The repair and replacement of parts are rapid and simple. Since the element is flat and has no structural irregularities, the distortion and adverse performance of the cell assembly are avoided. The material selected for the ozone generation cell is low-cost, and the design of the discharge chamber in the cell results in high ozone generation performance. The ozone generation cell is compact, about 10”×7.5”×3” in one embodiment, and since a plurality of cells can be easily stacked, it has scalability for ozone generation.

[0026] This description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form described, and many modifications and variations are possible in light of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention in various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention is defined by the following claims.

Claims

1. A discharge ozone generation cell, comprising: a non-conductive flat spacer plate that separates the first and second electrode substrates, the spacer plate having two side surfaces and an inner edge that define a central opening of the spacer plate; a flat electrode plate that is in close contact with the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate; a flat dielectric plate that is in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate, and the electrode plate defining a gas discharge chamber; gaskets that are disposed around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, the gaskets reducing exposure of ozone in the discharge chamber while ensuring gas tightness of the discharge chamber; A discharge ozone generation cell comprising the above.

2. The discharge ozone generation cell according to claim 1, wherein the gasket includes an O-ring gasket.

3. The discharge ozone generation cell according to claim 2, further comprising grooves that are disposed around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate so as to receive the O-ring gasket.

4. The discharge ozone generation cell according to claim 1, wherein the gasket includes an elastic material.

5. The discharge ozone generation cell according to claim 4, wherein the gasket includes an FKM (fluoroelastomer) material.

6. The discharge ozone generation cell according to claim 1, wherein the spacer plate includes polycarbonate.

7. The discharge ozone generation cell according to claim 1, wherein the electrode plate includes anodized aluminum injected with PTFE (polytetrafluoroethylene).

8. The discharge ozone generation cell according to claim 1, wherein the electrode plate includes anodized aluminum.

9. The discharge ozone generation cell according to claim 1, wherein the electrode plate includes high chromium steel.

10. The discharge ozone generation cell according to claim 1, wherein the electrode plate includes anodized alumina bonded to a conductive carrier.

11. The discharge ozone generation cell according to claim 1, wherein the first and second electrode substrates include aluminum.

12. The spacer plate has a first predetermined thickness, the electrode plate has a second predetermined thickness, the dielectric plate has a third predetermined thickness, and a difference between the first predetermined thickness and the sum of the second and third predetermined thicknesses forms the discharge chamber together with the inner edge of the spacer plate. The discharge ozone generation cell according to claim 1.

13. A discharge ozone generation cell, A non-conductive spacer plate that separates the first and second electrode substrates, the spacer plate having two side surfaces and an inner edge that define a central opening of the spacer plate; An electrode plate that is in close contact with the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate; A dielectric plate that is in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate, and the electrode plate defining a gas discharge chamber. A dielectric plate; Gaskets around the central opening on both sides of the spacer plate to ensure gas tightness of the discharge chamber; Including, The spacer plate has a first predetermined thickness, the electrode plate has a second predetermined thickness, the dielectric plate has a third predetermined thickness, and a difference between the first predetermined thickness and the sum of the second and third predetermined thicknesses forms the discharge chamber together with the inner edge of the spacer plate. A discharge ozone generation cell.

14. The discharge ozone generation cell according to claim 13, wherein a difference between the first predetermined thickness and the sum of the second and third predetermined thicknesses is in the range of (10 - 30) × 10-3 inches.

15. The discharge ozone generation cell according to claim 13, wherein the spacer plate includes polycarbonate.

16. The discharge ozone generation cell according to claim 13, wherein the electrode plate includes anodized aluminum injected with PTFE (polytetrafluoroethylene).

17. The discharge ozone generation cell according to claim 13, wherein the first and second electrode substrates include aluminum.

18. The discharge ozone generation cell according to claim 13, wherein the gasket includes an elastic material.

19. The discharge ozone generation cell according to claim 18, wherein the gasket includes an FKM (fluoroelastomer) material.

20. A discharge ozone generation cell, A non-conductive flat spacer plate that separates the first and second electrode substrates, the spacer plate having two side surfaces and an inner edge that define a central opening of the spacer plate; A flat electrode plate in close contact with the first electrode substrate, which is an electrode plate fitted into the central opening of the spacer plate and contains anodized aluminum injected with PTFE (polytetrafluoroethylene). A flat dielectric plate in close contact with the second electrode substrate and the spacer plate, which defines a gas discharge chamber together with the dielectric plate, the inner edge of the spacer plate, and the electrode plate. Gaskets located around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, which reduce the exposure of the discharge chamber to ozone while ensuring the gas tightness of the discharge chamber. A discharge ozone generation cell including the above components.

21. The discharge ozone generation cell according to claim 20, wherein the spacer plate contains polycarbonate.

22. The discharge ozone generation cell according to claim 20, wherein the first and second electrode substrates contain aluminum.

23. The discharge ozone generation cell according to claim 20, wherein the gasket contains an elastic material.

24. The discharge ozone generation cell according to claim 23, wherein the gasket contains an FKM (fluoroelastomer) material.

25. A discharge ozone generation cell, A non-conductive flat spacer plate that separates the first and second electrode substrates, having two side surfaces and an inner edge that define the central opening of the spacer plate. A flat electrode plate in close contact with the first electrode substrate, which is an electrode plate fitted into the central opening of the spacer plate. A flat dielectric plate in close contact with the second electrode substrate and the spacer plate, which defines a gas discharge chamber together with the dielectric plate, the inner edge of the spacer plate, and the electrode plate. Gaskets located around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, which reduce the exposure of the discharge chamber to ozone while ensuring the gas tightness of the discharge chamber. A clamp configuration that engages around the first and second electrode substrates via the spacer plate. including the same, whereby the flat spacer plate, the flat electrode plate, the flat dielectric plate, and the gasket are joined together between the first electrode substrate and the second electrode substrate while minimizing distortion, a discharge ozone generation cell.

26. The clamp configuration includes a plurality of holes distributed around the first and second electrode substrates and the spacer plate, and a corresponding plurality of non-conductive fasteners, each fastener connecting the first and second electrode substrates through the corresponding holes to the flat spacer plate between the first and second electrode substrates. The discharge ozone generation cell according to claim 25.

27. The discharge ozone generation cell according to claim 26, wherein each fastener includes a threaded rod and a relative nut.

28. The discharge ozone generation cell according to claim 27, wherein the threaded rod includes a bolt.

29. The discharge ozone generation cell according to claim 26, wherein each fastener includes a plastic reinforced with glass fiber.

30. The discharge ozone generation cell according to claim 25, wherein a plurality of holes distributed around the first and second electrode substrates are each chamfered.

31. The first and second electrode substrates each have a plane facing the spacer plate, and a plurality of holes distributed around the first and second electrode substrates are each chamfered in the plane. The discharge ozone generation cell according to claim 30.

32. The discharge ozone generation cell according to claim 25, wherein the spacer plate extends laterally beyond the first and second electrode substrates.

33. The discharge ozone generation cell according to claim 25, wherein the flat spacer plate includes a recess on one side around the central opening to hold the dielectric plate.

34. The discharge ozone generation cell according to claim 33, wherein the recess includes one of the gaskets arranged around the central opening and spaced from the inner edge of the spacer plate.

35. A discharge ozone generation cell, a non-conductive spacer plate separating the first and second electrode substrates, the spacer plate having two side surfaces and an inner edge defining a central opening of the spacer plate, an electrode plate in close contact with the surface of the first electrode substrate, the electrode plate being fitted into the central opening of the spacer plate, A dielectric plate in close contact with the second electrode substrate and the spacer plate, the dielectric plate, the inner edge of the spacer plate, and the electrode plate define a gas discharge chamber, the gas discharge chamber has two opposing ends, and the inner edge of the central opening is offset from the electrode plate at the two opposing ends, the dielectric plate; Channels located at each of the two opposing ends of the gas discharge chamber and along the surface of the first electrode substrate, the channels being connected to gas input and output terminals via the first electrode substrate, and the inner edge of the central opening being offset from the electrode plate at the two opposing ends so as to be exposed to the gas discharge chamber; comprising; Thereby, a discharge ozone generation cell in which the channels form a manifold for gas input and output to and from the gas discharge chamber.

36. The spacer plate has a first predetermined thickness, the electrode plate has a second predetermined thickness, the dielectric plate has a third predetermined thickness, and the difference between the first predetermined thickness and the sum of the second and third predetermined thicknesses forms the discharge chamber together with the inner edge of the spacer plate. The discharge ozone generation cell according to claim 35.

37. The spacer plate further includes gaskets disposed around the central opening on both sides of the spacer plate and spaced from the inner edge of the spacer plate, whereby the gaskets reduce exposure to ozone in the discharge chamber while ensuring gas tightness of the discharge chamber. The discharge ozone generation cell according to claim 35.

38. The discharge ozone generation cell according to claim 37, wherein the gasket contains an elastic material.

39. The discharge ozone generation cell according to claim 38, wherein the gasket contains an FKM (fluoroelastomer) material.

40. The discharge ozone generation cell according to claim 35, wherein the spacer plate contains polycarbonate.

41. The discharge ozone generation cell according to claim 35, wherein the electrode plate contains anodized aluminum injected with PTFE (polytetrafluoroethylene).

42. The discharge ozone generation cell according to claim 35, wherein the first and second electrode substrates contain aluminum.

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