JP2000072411A - Ozone generation device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozone generation device having a proper discharging gap. SOLUTION: A cylindrical metallic pipe 21 is arranged in a device main body 1 and a discharge pipe 12 is inserted into the metallic pipe 21. Pressurized water is filled in a cooling space 9 between the device main body and the metallic pipe 21 and the metallic pipe 21 is projected to the discharge pipe 12 side by being deformed by the pressurized water. In this way, a discharging gap 14 between the discharge pipe 12 and the metallic pipe 21 is adjusted to a proper value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generating apparatus for generating ozone used for deodorization, decolorization, sterilization, and operation of clean water, sewage, human waste, industrial wastewater, pool water, and the like by silent discharge, and a method of manufacturing the same. About.

[0002]

2. Description of the Related Art A conventional ozone generator will be described with reference to FIG. As shown in FIG. 9, the ozone generator has a cylindrical metal tube 21 and a discharge tube 12 inserted in the cylindrical metal tube 21. Of these, the discharge tube 12 has a metal coating 12a on its inner surface. The discharge tube 12 is made of a metal tube 2 by a spacer 13a and a coil spring 13b.
1 is arranged at a predetermined position in the space 1 so as to form a discharge gap 14 with the metal tube 21.

In such an ozone generator, when a high voltage is applied from the power supply 20 between the metal coating 12 a of the discharge tube 12 and the cylindrical metal tube 21, a discharge occurs in the discharge gap 14. During this time, ozone is generated from the source gas by supplying the source gas into the discharge gap 14.

[0004]

In the conventional ozone generator, when the discharge tube 12 is inserted into the cylindrical metal tube 21, spacers 13a and coil springs 13b are arranged at both ends of the discharge tube 12, and the discharge tube 12 Are fixed one by one. Since the spacer 13a and the coil spring 13b are not fixed, they may move depending on the amount of force applied. If the return portion of the spacer 13a or the winding portion of the coil spring 13b is crushed, the position of the discharge tube 12 is shifted from the center of the metal tube 21.

[0005] The operation of inserting the discharge tube 12 by such a method involves such difficulties that it is called a craftsmanship. Moreover, in this method, the discharge gap 14 cannot be made uniform, so that the discharge density becomes non-uniform, and the temperature distribution of the discharge tube 12 also becomes non-uniform. As a result, the cooling efficiency of the discharge tube 12 is reduced, and the ozone generation efficiency is reduced. To prevent this, after the discharge tubes 12 are inserted, 10 points among the discharge gaps 14 of all the discharge tubes 12 are measured at equal intervals on the circumference, and discharge is performed so that the points of the discharge gaps 14 become the most uniform. The tube 12 is rotated so that the accuracy of the discharge gap 14 is improved. This series of assembling operations requires a great deal of time. In particular, in the case of a large ozone generator having a large number of discharge tubes 12, one time is required for insertion of the discharge tubes 12 and management of the gap 14.
Some take longer than a week.

In order to improve the accuracy of the discharge gap 14, not only the management of the discharge gap 14 but also the improvement of the manufacturing accuracy of the metal tube 21 and the discharge tube 12 is required. That is, for the discharge tube 12 having a lower accuracy than the metal tube 21, it is necessary to add a shaping process during the manufacturing process to minimize the circumferential and longitudinal strains. It takes a lot of time and money to make it uniform.

[0007] The management of the discharge gap 14 directly contributes to the cooling efficiency of the heat generated by the discharge. The narrower the discharge gap 14, the higher the cooling efficiency and the higher the ozone generation efficiency.
To narrow the discharge gap 14, it is conceivable to reduce the diameter of the cylindrical metal tube 21 and increase the diameter of the discharge tube 12. However, depending on the structure of the spacer 13 a and the support portion of the coil spring 13 b of the discharge tube 12, etc. The limit of the discharge gap 14 is less than 1 mm. The present invention has been made in view of the above points, and provides an ozone generator and a method for manufacturing the same, which can narrow the discharge gap to an appropriate value and can be easily manufactured. With the goal.

[0008]

According to the present invention, there is provided an apparatus main body,
In a method for manufacturing an ozone generator, comprising: a cylindrical metal tube arranged in the device main body so as to form a cooling space with the device main body; and a discharge tube coaxially inserted into the cylindrical metal tube, A step of disposing a cylindrical metal tube in the apparatus main body, a step of inserting a discharge tube in the cylindrical metal tube, and a step of filling a cooling space with a pressurized liquid to pressurize and deform the metal tube to discharge the metal tube. A method of manufacturing an ozone generator, comprising:
In a method for manufacturing an ozone generator, comprising: a cylindrical metal tube arranged in the device main body so as to form a cooling space with the device main body; and a discharge tube coaxially inserted into the cylindrical metal tube, A step of disposing a cylindrical metal pipe in the apparatus main body, a step of filling powder in the cylindrical metal pipe, a step of filling a pressurized liquid in a cooling space and pressing and deforming the metal pipe, A step of inserting a discharge tube, and a method of manufacturing an ozone generator, comprising:
In the apparatus main body, there is provided a cylindrical metal tube arranged so as to form a cooling space with the apparatus main body, and a discharge tube coaxially inserted into the cylindrical metal tube. An ozone generator characterized by being made of a material having a coefficient of thermal expansion that sometimes narrows the gap between the metal tube and the discharge tube, and a cooling space between the device body and the device body. A cylindrical metal tube arranged to form
A discharge tube coaxially inserted into the cylindrical metal tube, wherein the cylindrical metal tube is made of a shape memory alloy that deforms to reduce the gap between the metal tube and the discharge tube when ozone is generated. Ozone generator.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show the first embodiment of the present invention.

As shown in FIGS. 1 and 2, the ozone generator includes an apparatus main body 1 and a cylindrical metal tube 21 arranged in the apparatus main body 1 so as to form a cooling space 9 between the apparatus main body 1 and the apparatus main body 1. ing. Two chambers 4 and 6 are formed on the left and right in the apparatus main body 1 by two partition walls 2 and 3. One of the empty chambers 4 has an inlet 5 for dry air as a raw material, and the other empty chamber 6 has an outlet 7 for ozonized air. The partition walls 2 and 3 are provided with openings (not shown) through which the cylindrical metal tube 21 passes. Cylindrical metal tube 21
Are connected and fixed so as to pass through this opening.
Further, a cooling water inlet 10 is provided at a lower portion of the cooling space 9,
A cooling water outlet 11 is provided at the upper part.

A cylindrical discharge tube 12 is inserted into the cylindrical metal tube 8 by a spacer 13a and a coil spring 13b so as to be coaxial with the cylindrical metal tube 8. The discharge tube 12 is a glass tube, and has a metal coating 12a on its inner surface. The metal film 12a is formed by vapor deposition and used as a high-voltage electrode, while the cylindrical metal tube 8 is grounded and used as a negative electrode.

An AC power supply 20 is connected between the metal film 12a and the cylindrical metal tube 21, and a high voltage is applied between the metal film 12a and the cylindrical metal tube 21 by the AC power supply 20. In this way, a discharge occurs in the discharge gap 14 between the discharge tube 12 and the cylindrical metal tube 21. Oxygen in the gas passing through the discharge gap 14 is ionized by such discharge, and ozone is generated. At the same time, more than 90% of the electrical energy is turned into heat. Since the decomposition reaction of ozone is accelerated by heat, it is important to efficiently cool the ozone generator to increase ozone generation efficiency. Since the cooling effect increases as the discharge gap 14 becomes smaller, the ozone generation efficiency increases. Further, by maintaining the discharge gap 14 uniform, the discharge density becomes uniform. Thereby, the temperature distribution of the discharge tube 12 becomes uniform, the cooling efficiency of the discharge tube 12 is improved, and the ozone generation efficiency is improved.

Next, a method of manufacturing the ozone generator will be described. First, a cylindrical metal tube 21 is arranged in the apparatus main body 1,
The cylindrical metal tube 21 is held by the partition walls 2 and 3. In this case, a cooling space 9 is formed between the apparatus main body 1 and the cylindrical metal tube 21. The plate thickness of the partition walls 2 and 3 is larger than that of the cylindrical metal tube 21. As a result, the strength of the cylindrical metal tube 21 is lowest in the cooling space 9 surrounded by the apparatus main body 1, the cylindrical metal tube 21, and the partitions 2, 3. Next, cylindrical metal tube 2
1, a discharge tube 12 is inserted, and a discharge gap 14 is formed as shown in FIG.

That is, as shown in FIG. 3, a pressurizing pump 2 is provided between the main body 1 of the ozone generator and the water tank 22.
4, a pressure-resistant system 30 including an inlet-side pressure gauge 25, an outlet-side pressure gauge 26, and an air vent 27. Next, the pressure pump 24 moves the cooling space 9 of the apparatus body 1 into the cooling space 9.
Fill with about 0 to 30 kg / cm ² of pressurized water. At this time, as shown in FIG.
Are plastically deformed by pressure from outside the tube and extend toward the discharge tube 12. At this time, if the temperature of the cylindrical metal tube 21 is raised to about 50 to 70 ° C. while the ozone generator is silently discharged, the pressure applied to the cylindrical metal tube 21 can be reduced.

According to the present embodiment, the metal tube 21 is deformed so as to conform to the uneven shape of the surface of the discharge tube 12, and the discharge gap 14 between the metal tube 21 and the discharge tube 12 can be matched. it can. In addition, a narrow discharge gap 14 that cannot be manufactured by the conventional method can be formed. As a result, heat generated by the discharge can be efficiently removed, and the ozone generation efficiency can be improved by 10 to 15%.

Since the cylindrical metal tube 21 and the discharge tube 12 do not need to be shaped, the number of manufacturing steps and costs are reduced. Furthermore, after the discharge tube 12 is inserted into the metal tube 21, the operation of adjusting the discharge gap 14 is not required, so that it is possible to greatly reduce the assembly cost.

The metal tube 21 may be made of a material having a small proof stress so that the metal tube 21 is deformed even with a small hydrostatic pressure.
For example, an austenitic SUS (SU
S300 series), the martensitic SUS (SUS) which has been rapidly hardened or precipitated and hardened on the pressurized water contact surface other than the metal pipe 21, for example, the apparatus body 1 and the partition walls 2 and 3.
(400 series), a difference in proof stress may be created, and only the metal tube 21 may be deformed.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment shown in FIGS. 5 and 6, after the cylindrical metal tube 21 is disposed in the apparatus main body 1, the powdery sand 56 is inserted without inserting the discharge tube 12 into the metal tube 21.
And then pressurized pump 24 of pressure-resistant system 30
By filling the cooling space 9 of the apparatus main body 1 with pressurized water, the metal tube 21 is deformed inward to obtain an ozone generator.

In FIGS. 5 and 6, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

5 and 6, after filling the metal tube 21 with powdered sand 56 adjusted to a particle size of 0.1 mm, the metal tube 21 is covered with a lid 55, and in this state, the cooling space 9 is cooled. The inside is filled with pressurized water. After the cooling space 9 is filled with pressurized water to deform the metal tube 21, the discharge tube 12 is inserted into the metal tube 21 to manufacture an ozone generator.

In this case, the workability is improved by arranging the apparatus main body 1 in the vertical direction.

As described above, by filling the cylindrical metal tube 21 with the sand 56, pressure is evenly applied to the metal tube 21. Therefore, the deformation of the cylindrical metal tube 21 becomes uniform over the entire tube, and The discharge gap 14 between them can be narrowed at a constant interval.

In this case, the sand 56 has a particle size of 0.1 mm or less and has a uniform particle size.
The condition is that there is little reaction with. Sand 56
For example, ceramics or the like may be used, and silica or alumina may be used. When the cylindrical metal tube 21 is plastically deformed, pressure is evenly applied to the cylindrical metal tube 21, so that the contraction becomes uniform over the entire tube and the discharge gap 1
4 is also narrowed at regular intervals.

According to the present embodiment, the narrow discharge gap 14
Moreover, since the accuracy can be improved, the discharge heat can be efficiently removed, and the ozone generation efficiency can be improved by 10 to 15%.

In this case, the gap is reduced by deforming the cylindrical metal tube 21 (ground electrode side). However, when the high-voltage electrode side is made of a metal tube, hydrostatic pressure is applied to the inside of the high-pressure electrode. It may be deformed to narrow the gap. In this case, contrary to the above, the cylindrical metal tube (the ground electrode side) may be made to have a large thickness, or a material having a high proof stress may be used to keep the shape of the cylindrical metal tube. Good.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG.

A third embodiment shown in FIG. 7 is an ozone generating apparatus according to the first embodiment shown in FIGS. 1 to 4 in which the partitions 2, 3 and the cylindrical metal tube 21 are hardly thermally expanded. Metal (eg, Fe-36Ni, Fe-32N)
i-5Co).

In FIG. 7, during discharge, the discharge tube 12 and the cylindrical metal tube 21 also become extremely high due to heat generated by the discharge. Therefore, the discharge tube 12 and the cylindrical metal tube 21 expand due to heat. In this embodiment, an ozone-resistant metal (eg, Fe-36Ni, Fe
(−32Ni-5Co or the like) so as not to expand even during discharge, so that only the discharge tube 12 on the high-voltage electrode side expands during discharge. Therefore, the discharge tube 12 and the metal tube 21
Is narrowed, and the ozone generation efficiency is improved.

In order to further reduce the coefficient of thermal expansion, it is preferable to use an Fe-Ni alloy containing Co up to 8%.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG.

The fourth embodiment shown in FIG. 8 is different from the first embodiment shown in FIGS.
A shape memory alloy (Ni-10Ti) is used, and a metal tube 21 that is deformed by heating and a discharge tube 12 that is deformed by heat during discharge are matched. During discharge, the discharge tube 12 on the high voltage electrode side expands, but at the same time, the cylindrical metal tube 21 on the negative pressure electrode side also changes to a shape that can be matched, so that the discharge gap 14 with the highest ozone generation efficiency is realized. Can be.

[0032]

As described above, according to the present invention, an ozone generator having a discharge gap of an appropriate value can be easily and reliably obtained, and the ozone generation efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an ozone generator according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of an ozone generator.

FIG. 3 is a diagram showing a manufacturing process of the ozone generator.

FIG. 4 is a diagram showing a manufacturing process of the ozone generator.

FIG. 5 is a diagram showing a manufacturing process of the ozone generator according to the second embodiment of the present invention.

FIG. 6 is a view showing a manufacturing process of the ozone generator according to the second embodiment of the present invention.

FIG. 7 is a diagram showing an ozone generator according to a third embodiment of the present invention.

FIG. 8 is a diagram showing an ozone generator according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a conventional ozone generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2, 3 Partition wall 9 Cooling space 12 Discharge tube 12a Metal coating 20 Power supply 21 Metal tube 56 Sand

Claims (4)

[Claims] 1. An apparatus main body, and a cylindrical metal tube disposed in the apparatus main body so as to form a cooling space between the apparatus main body,
In a method for manufacturing an ozone generator, comprising: a discharge tube coaxially inserted into a cylindrical metal tube; and a step of disposing a cylindrical metal tube in a device main body; and a step of inserting a discharge tube into the cylindrical metal tube. Filling the pressurized liquid in the cooling space and pressurizing and deforming the metal tube to narrow the gap between the metal tube and the discharge tube, comprising the steps of: . 2. An apparatus main body, and a cylindrical metal tube disposed in the apparatus main body so as to form a cooling space between the apparatus main body,
In a method for manufacturing an ozone generator, comprising: a discharge tube coaxially inserted into the cylindrical metal tube; a step of arranging the cylindrical metal tube in the device body; and a step of filling powder in the cylindrical metal tube; A method for manufacturing an ozone generator, comprising: a step of filling a cooling space with a pressurized liquid to pressurize and deform a metal tube; and a step of inserting a discharge tube into the metal tube. 3. An apparatus main body, a cylindrical metal tube disposed in the apparatus main body to form a cooling space between the apparatus main body, and a discharge tube coaxially inserted into the cylindrical metal tube. An ozone generator, wherein the cylindrical metal tube is made of a material having a coefficient of thermal expansion that narrows a gap between the metal tube and the discharge tube when generating ozone. 4. An apparatus main body, a cylindrical metal tube disposed in the apparatus main body so as to form a cooling space between the apparatus main body, and a discharge tube coaxially inserted into the cylindrical metal tube. The ozone generator, wherein the cylindrical metal tube is made of a shape memory alloy that deforms so as to narrow a gap between the metal tube and the discharge tube when ozone is generated.