JPH1129304A - Ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozonizer capable of preventing the decrease of ozone-generating efficiency by the displacement in the axis direction or the eccentric displacement of a discharging tube by fitting a stopping ring having ventilation parts for a raw material gas, having an outer diameter larger than the inner diameter of an earthed electrode in the outer periphery of the discharging tube in the inlet side of the raw material gas in a vessel. SOLUTION: A stopping ring 11 is fitted and fixed on the outer periphery of the terminal part of a discharging tube 4 in the inlet side of a raw material gas in a vessel 1. The inner diameter d1 of the stopping ring 11 is formed so as to be a little smaller than the outer diameter of the discharging tube 4, and the outer diameter d2 , of the stopping ring 11 is formed so as to be a little larger than the outer diameter of an earthed electrode 2. The stopping ring has plural raw material gas ventilation parts 11a formed by cutting into the stopping ring 11 from the inner side. The stopping ring is formed out of a resin having high resistance to ozone such as fluororesin. When the raw material gas flows in as shown by the arrow, the discharging tube 4 is apt to move in the axis direction by being pushed by the pressure, the stopping ring 11 can obstruct the movement of the discharging tube 4 in the axis direction by the action of the stopping ring 11 keeping contact with the terminal part of the earthed electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator for generating ozone by silent discharge, and more particularly to a support mechanism for a discharge tube.

[0002]

2. Description of the Related Art Ozone used for water treatment such as water supply and sewage is supplied by an ozone generator. Many of these ozone generators generally apply silent discharge. Silent discharge is a discharge with a low current density generated by applying a high-voltage alternating current with a dielectric such as glass sandwiched between metal electrodes.
It is considered to be the most suitable for producing ozone industrially.

FIG. 5 is a vertical sectional front view of an ozone generator, 1 is a cylindrical container, 2 is a grounding made of a stainless steel tube provided on the inner periphery of the container 1 via a pair of partition walls (or spacers) 3. The electrode 4 is a discharge tube formed of a glass tube whose one end is closed, and a high voltage electrode 5 is provided on the inner periphery thereof. A pair of spacers 6 are formed by winding a coil spring 7 made of stainless steel as shown in FIG. Reference numeral 8 denotes a high-voltage AC power supply, which is connected to the high-voltage electrode 5 via the conductor 9 and the brush 10, and the ground electrode 2 is grounded.

In the above configuration, a high-voltage alternating current is applied to the high-voltage electrode 5, the ground electrode 2 is grounded, and a silent discharge is generated in a discharge space between the discharge tube 4 and the ground electrode 2 as shown by an arrow. An ozone generating raw material gas such as dry air or oxygen gas is passed through the discharge space from the left side of the figure, and ozone O ₃ is generated and led out from the right side. The movement of the discharge tube 4 in the axial direction is only restricted by the conductor 9 and the brush 10, and the discharge tube 4 can freely move within the range.
Further, cooling water flows between the partition walls 3 inside and outside the container 1.

[0005]

In the above-described conventional ozone generator, the source gas flows into the discharge space, and at this time, a pressure of 0.7 kgf / cm ² is applied to the inside of the container 1. In some cases, the discharge tube 4 was pushed right by the source gas and moved to the right. When the discharge tube 4 moves, the high-voltage electrode 5 formed on the inner surface by aluminum spraying also moves, so that the discharge area decreases and a predetermined amount of ozone cannot be obtained. In addition, when the discharge tube 4 moves, the spacer 6 may come off, and the discharge space becomes uneven, which adversely affects the ozone generation efficiency. Therefore, when starting operation, the container 1
Although the gas flow rate into the inside is adjusted to prevent the displacement of the discharge tube 4, it has to be adjusted to a predetermined gas flow rate after the gas flow rate is stabilized, which requires extra labor and time at the start of operation. . Also, if the discharge tube 4 is displaced at the start of operation, the device must be stopped, the lid of the vessel 1 must be opened, and the position of the discharge tube 4 must be corrected. It was not easy and took time.

The outer diameter of the coil spring 7 constituting the spacer 6 is made to be the same as the gap between the ground electrode 2 and the discharge tube 4, and the entire length of the coil spring 7 is adjusted to the outer diameter of the discharge tube 4. It is manufactured. However, manufacturing tolerances are provided for the inner diameter of the ground electrode 2 and the outer diameter of the discharge tube 4, and depending on the combination of the two, the ground electrode 2 may have different tolerances.
May be larger than the outer diameter of the coil spring 7 in some cases. In this case, as shown in FIG. 7, the discharge tube 4 is not arranged concentrically with the ground electrode 2, but is arranged eccentric downward by its own weight. Conversely, when the difference between the inner diameter of the ground electrode 2 and the outer diameter of the discharge tube 4 is smaller than the outer diameter of the coil spring 7, the discharge tube 4 is inserted while deforming the coil spring 7. Also the discharge tube 4 is the ground electrode 2
They are not arranged concentrically and are eccentric. When the discharge tube 4 is eccentric with respect to the ground electrode 2 as described above, the ozone generation efficiency is reduced.
Further, when the spacer 6 is mounted on the outer periphery of the discharge tube 4, the spacer 6 is formed into a ring shape using the hooks 7a at both ends of the coil spring 7 and then inserted into the discharge tube 4. When the spring 7 is deformed, the hook 7a comes off and the spacer 6 is displaced and falls. The discharge tube 4 is largely eccentric, and the ozone generation efficiency is significantly reduced. And the fix wasn't easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an ozone generator capable of preventing a decrease in ozone generation efficiency due to a displacement or an eccentricity of a discharge tube in an axial direction. The purpose is to gain.

[0008]

According to a first aspect of the present invention, there is provided an ozone generator, wherein a retaining ring is fitted to an outer periphery of a discharge tube at an inflow side of a raw material gas in a container, and an outer diameter of the retaining ring is reduced. The inner diameter of the ground electrode is made larger to prevent the displacement of the discharge tube in the axial direction, and the retaining ring is provided with a flow portion of the raw material gas.

According to a second aspect of the present invention, the ozone generator is provided with a net-like discharge tube support for preventing the discharge tube from moving in the axial direction on the source gas outflow side in the container.

According to a third aspect of the present invention, in the ozone generator, at least a pair of spacers provided between the outer circumference of the discharge tube and the inner circumference of the ground electrode are formed in a ring shape to fit between the spacers, and the flow of the raw material gas is performed. This is a resin spacer having a flow portion.

According to a fourth aspect of the present invention, in the ozone generator, a pair of spacers provided between the outer periphery of the discharge tube and the inner periphery of the ground electrode are connected to the outer periphery of both ends of the discharge tube. And three or more protruding portions each of which has a tapered outer side and a protruding inner side between the main body and the discharge tube between the discharge tube and the ground electrode by a fitting structure. Is fitted between the outer circumference of the ground electrode and the inner circumference of the ground electrode.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 (a) and 1 (b) show a vertical sectional front view and a front view of a retaining ring of an ozone generator according to Embodiment 1, and reference numeral 11 denotes a container 1.
This is a retaining ring fitted and fixed to the outer periphery of the end of the discharge tube 4 on the raw material gas inflow side, and is formed of a resin having high ozone resistance such as fluororesin. The inner diameter d ₁ of the retaining ring 11 is slightly smaller than the outer diameter of the discharge tube 4, and the outer diameter d ₂ of the retaining ring 11 is larger than the outer diameter of the ground electrode 2. Further, the retaining ring 11 is provided with a plurality of source gas passages 11a cut from the inner peripheral side. Other configurations are the same as the conventional one.

In the first embodiment, when the raw material gas flows as shown by the arrow, the discharge tube 4 is pressed by the pressure and moves in the axial direction. Abutting on the end, the axial movement of the discharge tube 4 is prevented. For this reason, the high-voltage electrode 5 does not move, so that the facing area between the ground electrode 2 and the high-voltage electrode 5, that is, the discharge area can be prevented from decreasing, and the ozone generation efficiency can be improved.
Further, the spacer 6 does not come off with the movement of the discharge tube 4, the discharge space is kept uniform, and the ozone generation efficiency can be improved. In addition, the flow rate of the raw material gas can be set to a predetermined value from the start of the operation, and it is not necessary to correct the displacement of the discharge tube 4, so that unnecessary labor and time are unnecessary. Since the retaining ring 11 is formed of resin, abnormal discharge can be prevented.
The flow of the raw material gas does not hinder the flow of the raw material gas.

Embodiment 2 FIG. 2 shows a vertical sectional front view of an ozone generator according to Embodiment 2, in which a container 1 comprises a main body 1a and lids 1b provided at both ends thereof, and a raw material gas is provided on the lid 1b. Inflow port and outflow port are provided. Also, a large number of discharge tubes 4 are provided in parallel in the main body 1a, a high voltage electrode 5 is provided on the inner peripheral side, and a ground electrode is provided on the outer peripheral side of each discharge tube 4 via a pair of spacers 6. 2 are provided. Then, a net-like discharge tube support 12 is provided via a support member 13 inside the lid 1b on the source gas outflow side. The discharge tube support 12 is provided for each discharge tube 4.
The material is made of resin in order to prevent abnormal discharge.

Also in the second embodiment, the axial movement of the discharge tube 4 due to the inflow of the raw material gas is prevented by the discharge tube support 12, and the same effect as in the first embodiment is obtained. Since the discharge tube support 12 is formed in a mesh shape, there is no problem in the flow of the raw material gas.

Embodiment 3 FIGS. 3 (a) and 3 (b) show a vertical front view and a front view of a spacer of an ozone generator according to Embodiment 3, and 14 shows the inner circumference of the ground electrode 2 and the outer circumference of the discharge tube 4. FIG. It is a ring-shaped spacer fitted between the pair, and is made of resin.
The difference between the outer diameter and the inner diameter of the spacer 14 depends on the ground electrode 2 and the discharge tube 4.
(Approximately the maximum gap length that can be taken due to the dimensional tolerance between the ground electrode 2 and the discharge tube 4), and the inner diameter of the spacer 14 expands and contracts within the dimensional tolerance of the discharge tube 4 due to the elastic force of the resin. It is possible and can be fitted to all the discharge tubes 4 within the dimensional tolerance. Further, the elastic force of the spacer 14 is such that the spacer 14 is not compressed by its own weight. or,
A plurality of cuts are provided in the spacer 14 from the inner peripheral side, and a flow portion 14a for the source gas is formed.

In the third embodiment, since the spacer 14 is made of resin in a ring shape, the spacer 14 has elasticity, and the gap length between the ground electrode 2 and the discharge tube 4 is within a dimensional tolerance range. Can be kept uniform.
Therefore, no eccentricity occurs between the two, and the ozone generation efficiency can be improved. In addition, because of the ring shape, the fitting to the discharge tube 4 is easy, and since it has elasticity, it is hard to be detached from the discharge tube 4. This also keeps the gap length uniform and improves the ozone generation efficiency. be able to.

Embodiment 4 FIGS. 4 (a) and 4 (b) show a main part side view and a main part vertical sectional front view of an ozone generator according to Embodiment 4, and reference numeral 15 denotes a resin spacer. A ring-shaped main body 15a fitted to both ends is provided, and protrusions 15b protruding from the main body 15a between the ground electrode 2 and the discharge tube 4 at four locations in the upper, lower, left, and right directions. The outer peripheral side is tapered, and the inner peripheral side is fitted with the discharge tube 4. Then, it is fitted between the ground electrode 2 and the discharge tube 4 in the middle of each projection 15b. The spacer 15 can be extended and contracted similarly to the above embodiments, and can be fitted to all the discharge tubes 4 within the dimensional tolerance.

In the fourth embodiment, the spacer 15 has a protrusion 1 having a tapered outer periphery protruding at four locations in the upper, lower, left, and right directions.
5b, the projections 15b are fitted between the discharge tube 4 and the ground electrode 2 to exhibit a wedge effect, and the distance between the discharge tube 4 and the ground electrode 2 is kept uniform. No eccentricity occurs, and the ozone generation efficiency can be improved. Further, even if the spacer 15 is loosely fitted to the discharge tube 4, it can be firmly fitted by the wedge effect of each protruding portion 15b, so that the spacer 15 can be easily fitted to the discharge tube 4 and hardly comes off. Thus, the gap can be kept uniform. In the third embodiment, when the spacer 14 is fitted to the discharge tube 4, the discharge tube 4 may be damaged.
In the fourth embodiment, there is no such concern. Spacer 1
5 is fitted halfway through the protruding portion 15b, so that a portion closer to the main body 15a between the protruding portions 15b is open,
The flow of the source gas into the discharge space is performed without any trouble.

In the first to third embodiments, three or more spacers 6 and 14 can be provided. In the fourth embodiment, four protrusions 15b are provided, but three or more protrusions 15b may be provided.

[0021]

As described above, according to the first aspect of the present invention, since the retaining ring is fitted to the outer periphery of the discharge tube on the source gas inflow side, the retaining ring contacts the ground electrode when the source gas flows. In contact therewith, axial displacement of the discharge tube is prevented. For this reason, it is possible to prevent a decrease in the ozone generation efficiency due to a decrease in the discharge area and the detachment of the spacer, and it is not necessary to adjust the flow rate of the raw material gas and correct the displacement of the discharge tube.

According to the second aspect, since the discharge tube support for preventing the discharge tube from moving in the axial direction is provided on the outflow side of the raw material gas in the container, the same effect as the first aspect is obtained.

According to the third aspect, since the ring-shaped spacer made of resin is fitted between the ground electrode and the discharge tube, the spacer has elasticity, and the gap between the ground electrode and the discharge tube is slightly increased. Can be absorbed, and the gap can be kept uniform. Therefore, the ozone generation efficiency can be increased. Also, since the spacer has elasticity,
The gap is hardly detached from the discharge tube, and the gap can be kept uniform. Furthermore, since it has a ring shape, it can be easily fitted to the discharge tube.

According to the fourth aspect, the spacer fitted to both ends of the discharge tube is provided with a plurality of protrusions whose outer peripheral side is tapered,
The projecting portion is fitted halfway between the ground electrode and the discharge tube, the wedge effect keeps the space between them uniform, and this fitting is difficult to disengage, increasing ozone generation efficiency. it can. In addition, the spacer can be loosely fitted to the discharge tube, and damage to the discharge tube can be prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view and a front view of a retaining ring of an ozone generator according to Embodiment 1 of the present invention.

FIG. 2 is a vertical sectional front view of an ozone generator according to Embodiment 2.

FIG. 3 is a vertical sectional front view of an ozone generator and a front view of a spacer according to a third embodiment.

FIG. 4 is a main part side view and a main part longitudinal sectional front view of an ozone generator according to a fourth embodiment.

FIG. 5 is a vertical sectional front view of a conventional device.

FIG. 6 is a front view of a coil spring constituting a spacer.

FIG. 7 is a longitudinal sectional side view and a longitudinal sectional front view for explaining a defect of the conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Ground electrode 4 ... Discharge tube 5 ... High voltage electrode 6, 14, 15 ... Spacer 8 ... High voltage power supply 11 ... Retaining ring 11a, 14a ... Source gas flow part 12 ... Discharge tube support 15a ... Body part 15b ... Protrusion

Claims (4)

[Claims] 1. A tubular ground electrode is supported in a container, a discharge tube is supported on an inner periphery of the ground electrode via at least a pair of spacers, and a high-voltage electrode is provided on an inner periphery of the discharge tube.
In the ozone generator, which applies a high voltage to the high voltage electrode, grounds the ground electrode, and flows the source gas into the discharge space between the discharge tube and the ground electrode to generate ozone, the inflow side of the source gas in the container The ozone generating apparatus according to any one of claims 1 to 3, further comprising a retaining ring fitted to the outer periphery of the discharge tube, having an outer diameter larger than the inner diameter of the ground electrode, and having a flow passage for the raw material gas. 2. A tubular ground electrode is supported in the container, a discharge tube is supported on the inner periphery of the ground electrode via at least a pair of spacers, and a high-voltage electrode is provided on the inner periphery of the discharge tube.
A high voltage is applied to the high voltage electrode, the ground electrode is grounded, and the source gas flows through the discharge space between the discharge tube and the ground electrode to generate ozone. An ozone generator characterized in that a net-like discharge tube support for preventing axial movement of the discharge tube is provided in the container. 3. A tubular ground electrode is supported in the container, a discharge tube is supported on the inner periphery of the ground electrode via at least a pair of spacers, and a high-voltage electrode is provided on the inner periphery of the discharge tube.
In the ozone generator, which applies a high-voltage to the high-voltage electrode, grounds the ground electrode, and flows the raw material gas into the discharge space between the discharge tube and the ground electrode to generate ozone, the spacer is provided at the outer periphery of the discharge tube. An ozone generator, wherein the ozone generator is a resin-made spacer having a ring shape fitted between the inner circumference of the ground electrode and a ground electrode. 4. A tubular ground electrode is supported in the container, a discharge tube is supported on the inner periphery of the ground electrode via a pair of spacers, and a high-voltage electrode is provided on the inner periphery of the discharge tube. In the ozone generator which applies a voltage, grounds the ground electrode, and flows the raw material gas into the discharge space between the discharge tube and the ground electrode to generate ozone, the spacers are respectively provided at the outer periphery of both ends of the discharge tube. A ring-shaped main body portion to be fitted, and three or more protruding portions protruding from the respective main body portions between the discharge tube and the ground electrode, the outer peripheral side of which is tapered, and the inner peripheral side protrudes by a fitting structure. An ozone generator characterized in that a middle part of the ozone generator is fitted between the outer periphery of the discharge tube and the inner periphery of the ground electrode.