JP3114425U - Ozone generator - Google Patents

Abstract

【Task】
Ozone generation using a ceramic transformer, and the generation of ozone can be finely adjusted and controlled stably.
[Solution]
The ceramic transformer, which is the oscillator / high voltage power supply, and the ozone generating electrode are integrated, and the nine needle electrodes constituting the ozone generating electrode are horizontally opposed to the end surface on the secondary plate electrode side of the ceramic transformer. Are arranged in parallel and the gap lengths of the needle electrodes are different from each other, thereby increasing the ozone generation concentration and stabilizing the generation amount, and changing the primary voltage of the ceramic transformer to change the secondary side. In this configuration, the voltage can be adjusted to thereby adjust fine ozone generation.
[Selection] Figure 2

Description

The present invention relates to an ozone generator using needle-to-ceramic transformer electrodes.
Specifically, the present invention relates to an ozone generator that generates ozone from the air by high-frequency discharge using a high voltage power source and a needle electrode composed of an oscillator and a ceramic transformer.

The focus of environmental issues in recent years is expanding not only to the problem of familiar living spaces but also to global environmental issues.
I often hear about ozone in the stratosphere, such as the ozone hole and ozone layer restoration. A solvent such as Freon gas reaches the upper layer of the atmosphere, destroys the ozone layer that is stable 20 to 30 km above the ground, and forms a so-called ozone hole.
Ozone in this region is generated from oxygen by the ultraviolet rays from the sun to form an ozone layer, and the harmful ultraviolet rays from the sun are cut to protect the creatures on the earth.

By the way, this ozone has the second strongest oxidizing property after fluorine in nature.
Using this chemically active property, ozone is used in many applications such as sterilization, decolorization, and deodorization.
Ozone naturally decomposes at room temperature and returns to oxygen.
Therefore, it is attracting attention as a next-generation sterilizing and oxidizing agent that replaces chlorine, because it does not have the risk of causing permanent damage.
The most chemically active nature is accompanied by difficulties in storage, management and adjustment. Furthermore, a large amount of ozone is a dangerous substance because it has the effect of destroying the respiratory organs of humans and organisms. Therefore, it is necessary to give sufficient consideration to hygiene and safety when using it.
In order to use ozone in a living space, it is necessary to use an appropriate amount of ozone in the right place. By keeping the conditions, a comfortable and healthy living space can be created.

In recent years, the development of a small and safe ozone generator that can easily adjust the amount of ozone generated so that deodorization and mold prevention can be easily performed in small offices and general households is expected. Yes.

Basic ozone generation methods include electrolysis, photochemical reaction, ultraviolet irradiation, radiation irradiation, plasma discharge, silent discharge, corona discharge, high frequency discharge, etc. This is due to the high frequency discharge method using
In the present invention, an electromagnetic winding transformer is not used as a high-voltage power supply, but a ceramic transformer having a steep frequency characteristic, which is a self-boosting discharge electrode, and a needle electrode are used.
The ceramic transformer used in the ozone generator is absolutely useful in that it can be miniaturized, and the high safety due to the inherent non-explosive nature (explosion proof) of the ceramic is also technically superior.
Furthermore, the ceramic transformer is useful even when there is little external noise harmful to the human body.
The development of an ozone generator with high ozone controllability using a ceramic transformer with steep frequency characteristics has been demanded.
Incidentally, there are the following precedent technologies for small ozone generators using needle electrodes.
Patent application title: Ozone generator

The problem to be solved is that, when an ozone generator using a ceramic transformer is used, it is not easy to appropriately discharge and suppress ozone generation due to the steep step-up ratio characteristic of the ceramic transformer. .

The present invention has a structure in which a ceramic transformer and an electrode for generating ozone are integrated on a base, and addresses the above-mentioned problems.
Furthermore, the electrode for generating ozone of the ozone generator is used as a needle electrode, and the configuration thereof is examined, and an optimum electrode configuration, arrangement, and gap configuration are obtained.
And the generation | occurrence | production control of ozone can be finely adjusted by changing the primary side voltage of a ceramic transformer, It is characterized by the above-mentioned.

As will be described later, the ozone generator using the ceramic transformer of the present invention can be configured very compactly, and can be used in small offices and general households. Will be able to use.
Furthermore, the generation control of ozone can be finely adjusted and not only can be controlled and managed firmly, but also can be generated as necessary when necessary.
More specifically, the ozone generation amount can be adjusted to 0.02 to 100 [ppm] by changing the primary side voltage of the ceramic transformer.
Furthermore, there is an advantage that the ozone generation amount does not change even by continuous operation for 24 hours.

The best mode for carrying out the ozone generator (1) according to the present invention is a mode in which the ceramic transformer (4) is first supported at two points by sponge rubber or the like.
This makes it possible to stably apply a high voltage between the side end face of the secondary electrode (7) constituting the ozone generating electrode (10) and the needle electrode (9) provided opposite to the side end face. .
Further, the needle electrode (9) is kept horizontal so that the electric field generated between the secondary electrode (7) and the needle electrode (9) is kept more uniform, and the gap length is changed for each individual needle. By doing so, it was possible to increase the ozone concentration.
Specifically, the ozone generator (1) is integrally provided with a high voltage power source (2) and an ozone generating electrode (10) on a base, and the high voltage power source (2) is an oscillator (3). The ceramic transformer (4) is composed of a drive unit (6) in which a primary electrode (5) is formed in the thickness direction and a secondary electrode (7) on a side end surface. The ceramic transformer (4) is supported by a cushioning member such as sponge rubber at the minimum contact point, and the ozone generating electrode (10) is composed of a plurality of needle electrodes. (9) It is comprised as an ozone generator characterized by being provided facing the side end surface of the said secondary side electrode (7).
The ceramic transformer (4) has a resonance frequency of approximately 54 KHz to 58 KHz, is a plate having a length of 61 mm, a width of 13 mm, a thickness of 2 mm, and the like, and is made of lead zirconate titanate.
The plurality of needle electrodes (9) are arranged with a gap between the side end surface, which is the secondary electrode (7) of the ceramic transformer (4), and are configured in a straight line and horizontally.
Further, the needle electrode (9) is arranged with nine needles composed of the first needle to the ninth needle, and the total width of the nine needles is the secondary electrode (7) of the ceramic transformer (4). Is approximately equal to the width of the side end face.
Furthermore, the length of the gap in which the needle electrode (9) and the secondary electrode (7) of the ceramic transformer (4) are arranged to face each other is such that the needle electrode (9) on both ends is at the center. In other words, in other words, the needle electrodes (9) on both end sides are arranged so as to be separated and elongated in a substantially parabolic shape in plan view.

The ceramic transformer (4) in FIG. 3 is obtained by sintering and molding a piezoelectric material. The dimensions are 61 mm in length, 13 mm in width, and 2 mm in thickness. The material is a plate element made of lead zirconate titanate. It is.
The drive unit (6) of this element has a primary electrode (5) on the upper and lower surfaces and polarization treatment in the thickness direction, and the power generation unit (8) has a secondary electrode (7) on the right end surface. Polarized in the vertical direction.
The operation of the ceramic transformer (4) is converted from electrical vibration to mechanical vibration by the piezoelectric effect when a voltage is applied to the drive section (6), and propagates through the ceramic transformer (4).
The electric field is applied in the thickness direction, but the whole resonates in the length direction due to Poisson coupling.
When a resonance frequency determined by the length direction of the ceramic transformer (4) is applied, a standing wave is generated and the propagated vibration is subjected to amplitude conversion, and the vibration is increased.
Due to the piezoelectric effect, vibration with electrical amplitude increased by converting from mechanical vibration to electrical vibration is obtained.

Since the ceramic transformer (4) vibrates on the whole plate, it is necessary to support the ceramic transformer (4) so as not to inhibit the vibration as much as possible.
As a method for supporting the ceramic transformer (4), there is a method in which the ceramic transformer (4) is supported on a base with a cushioning member such as vinyl chloride or the like by sandwiching the ceramic transformer (4) in a sponge rubber or the like. In the embodiment of FIGS. 1 and 2, two frames are erected on the base and front and back, and a ceramic transformer (4) is bridged on the frame.
The support means that does not inhibit the vibration becomes support with the minimum contact area at the minimum amplitude point.

The ceramic transformer (4) having the shape shown in FIG. 4 has a vibration mode capable of obtaining a practically sufficient step-up ratio as a transformer.
One is a half wavelength at which the amplitude is minimized at the center of the element.
The other is one wavelength having two points where the amplitude is minimized.
In the present invention, the vibration mode of the ceramic transformer (4) employs the λ vibration mode.
The reason is that the supporting method becomes easy. When supporting the ceramic transformer (4), the position where the amplitude is minimized is supported using vinyl chloride or the like.
As shown in the right diagram of FIG. 4, when there are two points where the amplitude is minimized, the two points can be stably supported by supporting those points.
If supported at these two points, the vibration of the ceramic transformer (4) is not hindered.
When the vibration is inhibited, the pressure increase ratio decreases.

The operation of the ceramic transformer (4) depends on the resonance frequency.
By measuring the resonance frequency characteristics, it is possible to select a resonance frequency at which a practically sufficient step-up ratio can be obtained as a transformer.

The circuit configuration of the ozone generator according to the present invention is shown in FIG.
The load resistance is set to 10 [MΩ], a sine wave voltage 2 [V] is applied to the primary side of the ceramic transformer (4), and the resonance frequency is changed by 1 [kHz] from 20 to 70 [kHz]. The side voltage was measured.

The measurement results are shown in FIG. The horizontal axis represents the resonance frequency [kHz], and the vertical axis represents the step-up ratio [times].
Based on the primary voltage of the ceramic transformer (4) and the secondary voltage of the ceramic transformer (4), the step-up ratio was calculated by the following equation.
Boost ratio [times] = secondary side voltage Vs [V] / primary side voltage Vp [V]
From the measurement results, in order to obtain a practically high step-up ratio as a ceramic transformer, it was confirmed that the vibration modes of the ceramic transformer (4) were half-wave resonance and single-wave resonance.
When the primary side voltage is 2 [V] and the load resistance is 10 [MΩ], the step-up ratio is 75 times for the half-wave resonance of the ceramic transformer (4) 61 mm long and 140 times for the one-wave resonance. It was confirmed that It was also found that a higher step-up ratio can be obtained when the length of the ceramic transformer (4) is longer.

The resonance frequency varies depending on the length of the ceramic transformer (4), and the length of the ceramic transformer (4) is 61.50 [kHz] for half-wave resonance of 61 mm and 53.54 [kHz] for one-wavelength resonance. . It can also be seen that the width of the resonance point is very narrow.
In order to avoid the audible range, a resonance frequency of 54 [kHz] was selected.

Generally, the ceramic transformer (4) is characterized in that when the value of the secondary side load resistance decreases, the input impedance on the primary side increases and the step-up ratio decreases.
Therefore, the following experiment was conducted to investigate the behavior of the ceramic transformer (4) due to the difference in load resistance.
Using the circuit shown in FIG. 5, a constant sine wave voltage of 2 [V] is applied to the primary side of the ceramic transformer (4), and the load resistance is changed in the range of 10 to 1000 [MΩ]. The voltage was measured to determine the boost ratio.
From the measurement results shown in FIG. 7, when the load resistance is 10 to 1000 [MΩ], the condition that the boost ratio is maximum is when the load resistance is 1000 [MΩ], the boost ratio is 676 times, and the input impedance is 146. [Ω] was confirmed.

The present invention is based on the above knowledge and has created an ozone generator using a ceramic transformer (4).
As shown in FIG. 8, the basis of the present invention is that ozone is formed by the secondary electrode (7) of the ceramic transformer (4) and the needle electrode (9) in which a plurality of needles are arranged so that the needle tips are in a straight line. The generating electrode (10) is constructed.
The effectiveness of the ceramic transformer (4) as a high-voltage power supply (2) is demonstrated, and the high-voltage power supply (2) and the ozone generation electrode (10) are integrated into a compact and simple structure. .
The material of the ceramic transformer (4) of the embodiment is lead zirconate titanate, the resonance frequency is 58 [kHz], the dimensions are 61 mm in length, 13 mm in width, and 2 mm in thickness.
The electrode for ozone generation (10) is a needle composed of a plurality of record needles opposed to the side end face of the secondary electrode (7) of the ceramic transformer (4) having a width of 13 mm and a length of 2 mm. A counter-plate electrode configuration was adopted. It can be freely designed whether the side end face is used as the ozone generating electrode (10) as it is or another plate electrode is connected.
When nine record needles are arranged, the needle tips at both ends are positioned at the left and right ends of the secondary electrode (7) of the ceramic transformer (4). The total of the plurality of needle widths is substantially equal to the width of the side end face of the secondary electrode (7) of the ceramic transformer (4).
The needle electrode (9) was composed of a record needle (needle tip curvature radius: 75 μm) and connected to a common electrode of the ceramic transformer (4).

FIG. 9 shows the position of the opposing angle of the needle electrode (9) with respect to the secondary electrode (7).
One is the one where a plurality of needles are arranged so that the needle tips are in a straight line with respect to the surface of the secondary electrode (7) of the ceramic transformer (4) and placed on the same plane as the ceramic transformer (4). Was 0 °.
Comparison was made on three types inclined 45 ° from this position and 90 ° (perpendicular) to the ceramic transformer (4).
Here, in order to clarify the position of the needle, numbers were assigned as shown in FIG.
The position of the needle was determined by setting the left edge to number 1, the number in order, and the right edge to number 9, toward the secondary electrode (7) of the ceramic transformer (4). When a plurality of needles are placed, the center needle position is always 5th. For example, in the case of three needles, verification was performed by placing the needles at positions 4, 5, and 6.

When the applied voltage exceeds the maximum voltage, the discharge between the electrodes becomes a spark discharge, and the ozone yield decreases.

Further, in order to determine the electrode structure, the relative position (tilt 0 °, 45 °, 90 °) of the needle electrode (9) with respect to the secondary electrode (7) of the ceramic transformer (4) is changed to change the state of ozone generation. Observed.
In FIG. 11, a sine wave voltage of 5 [V] is applied to the drive section (6) of the ceramic transformer (4), and the gap length between the secondary side electrode of the ceramic transformer (4) and the needle tip is made constant by 2 mm. The ozone concentration with respect to the number of needles at each position is shown.
From the measurement results shown in FIG. 11, when the inclination is 0 °, the ozone concentration increases as the number of needles increases. However, when the inclination is 45 ° and 90 °, the ozone concentration does not increase even if the number of needles increases. Does not increase. This is probably because a plurality of needles caused spark discharge.
Based on this result, the electrode structure was determined to have a needle inclination of 0 °. That is, it has been found that the optimum structure is that the tip of the needle is positioned directly opposite to the surface of the plate electrode of the ceramic transformer (4) with the needle tilt of 0 °.
The meaning of being opposed to the side end surface means that the facing position is main.

FIG. 12 shows the relationship between (the minimum primary voltage and the ozone concentration at that time) and (the maximum voltage and the ozone concentration at that time) with respect to the number of needles. It is the figure which took the number of stitches on the horizontal axis and the voltage on the vertical axis.
As can be seen from FIG. 12, in the case of one needle, the primary side voltage is 1.7 to 7.0 [V] and the ozone concentration at that time is 0.03 to 10 [ppm] In the case of nine, the primary side voltage was 2.4 to 5.5 [V], and the ozone concentration at that time was 0.06 to 60 [ppm].
When the number of needles was increased, the minimum primary voltage increased, but when the number of needles was 5 or more, there was no increase in voltage (maximum voltage) immediately before the transition to spark discharge. It was.
The reason for this may be that the secondary electrode (7) of the ceramic transformer (4) is small, so that when the number of needles increases, the needles at both ends shift to a spark discharge at a low voltage.

Next, as shown in FIG. 13, a single needle is used, the position of the needle electrode (9) is changed to positions 1 to 9, and the maximum applied to the primary side of the ceramic transformer (4) at each position. The voltage was examined. The result is shown in FIG.
As can be seen from FIG. 14, the maximum voltage at the position 5 corresponding to the center of the secondary electrode of the ceramic transformer (4) is 7 [V], and the maximum voltage at the position 1 (left end). Was 3.5 [V].
Therefore, in order to discharge uniformly from the entire needle, the ozone concentration was measured when the electrode configuration was widened at both ends as shown in FIG. (When arranging multiple needles, the needles at both ends were expanded by 0.25 mm to 2.25 mm. In the case of 9 needles, the 1st and 9th needles were expanded by 0.25 mm, and 2 I extended the needle of No. 8 and No. 8 by 0.1 mm.)
The arrangement of the needle electrodes in FIG. 15 is arranged so that the needle electrodes (9) on both ends are long and separated in a parabolic shape in plan view.
The level of the spark discharge is leveled with the gap length being different at the position of the needle electrode (9).
The result is shown in FIG. This figure shows the relationship between the primary voltage and the ozone concentration with respect to the number of needles.
From this measurement result, by changing the gap length of the needle electrode (9), in the case of five needles, the primary side voltage is 1.8 to 10.5 [V] and the ozone concentration is 0.03 to 75. In the case of [ppm] and nine needles, the ozone concentration was 0.06 to 100 [ppm] at 2 to 12 [V].
In this series of experiments, by increasing the gap length of the needle electrodes at both ends by 0.25 mm, the applied voltage (maximum voltage) is increased by 6.5 [V] and the ozone concentration is 40 [V] in the case of nine needles. ppm] could be increased.
This is probably because the electric field of each needle became uniform and the ozone concentration could be increased by widening the gap between the needles at both ends.
As a result, the length of the gap in the configuration in which the needle electrode (9) and the secondary electrode (7) of the ceramic transformer (4) are arranged to face each other is such that the needle electrodes (9) on both ends are in plan view. It was found that the long parabolically long form is a good arrangement for increasing the ozone concentration.
The length of the gap between the needle electrode (9) and the secondary electrode (7) is 1st needle = 9th needle <2nd needle = 8th needle <3rd needle = 4th needle = 5th needle = 6 It is preferable that the needle number = 7th hand.

FIG. 17 shows the relationship between the primary voltage and the ozone concentration when the number of needles is 3, 5, and 9.
From the measurement results, the ozone concentration monotonously increases for each electrode type up to the vicinity of the primary side voltage 6 [V].
It can be seen that the ozone concentration is determined by the primary voltage, and the ozone concentration increases as the primary voltage increases.
By utilizing this characteristic, an apparatus capable of finely adjusting the ozone concentration can be provided.
Finally, it was examined whether the ozone generator using the ceramic transformer (4) can set the ozone generation concentration by the primary side voltage of the ceramic transformer (4) and can keep the ozone concentration constant thereafter.
In the experiment, the primary voltage of the ceramic transformer was set to a constant 12 [V], ozone was generated and the time when the generated concentration was stabilized was set to 0:00, and the 24-hour characteristics were measured.
The electrode structure shown in FIG. 15 is 9 needles, the 1st and 9th needles are expanded by 0.25 mm, and the 2nd and 8th needles are further expanded by 0.1 mm, and the frequency is 58. 225 [kHz] was constant.
The result is shown in FIG.
As apparent from FIG. 18, it was found that the ozone concentration was stable within 24 hours of the experiment.

The ozone generator (1) as described above is 1. Since the ceramic transformer (4) and the ozone generating electrode (10) are integrated in a compact structure, the ceramic transformer (4) and the ozone generating electrode (10) can be miniaturized so that deodorization and mold prevention can be easily performed even in small offices and general households.
2. By examining the configuration of the needle electrode (9) of the ozone generator (1) and finding the optimal electrode configuration, not only enables stable ozone generation, but also prevents unnecessary ozone from being discharged. be able to.
3. By changing the primary side voltage of the ceramic transformer (4), the ozone generation amount can be adjusted to 0.02 to 100 [ppm].
4. The amount of ozone generated does not change after 24 hours of continuous operation.
The technical effect was confirmed.

The ozone generator of the present invention has a structure in which an oscillator / high voltage power source ceramic transformer and an ozone generating electrode are integrated, and the nine needle electrodes constituting the ozone generating electrode are end faces on the plate electrode side of the ceramic transformer. In parallel with each other and with a different gap length, the ozone generation concentration is increased and the generation amount is stabilized, and the primary side voltage of the ceramic transformer is changed to change the secondary side. In this configuration, the voltage can be adjusted to thereby adjust fine ozone generation.
Since it is small and can control fine ozone generation, it is expected to be used in the medical, food, and nano fields.

The top view which showed one Example of the ozone generator. The perspective view of the same Example. Explanatory drawing of a ceramic transformer. The vibration mode explanatory drawing of a ceramic transformer. The circuit block diagram of the frequency characteristic of a ceramic transformer. The characteristic figure of a resonant frequency. FIG. 6 is a relationship diagram of a step-up ratio and input impedance with respect to a load resistance of a ceramic transformer. The related explanatory drawing of the electrode for ozone generation which consists of an oscillator, a primary side electrode, a secondary side electrode, and a needle electrode. Side surface explanatory drawing of the needle electrode with respect to a secondary side electrode. Plane position explanatory drawing of the needle electrode with respect to a secondary side electrode. The ozone density relationship diagram with respect to the number of stitches at each position. The primary side voltage with respect to the number of needles, and an ozone concentration relationship figure. FIG. The relationship of the primary side voltage with respect to the position of a needle | hook. The block diagram of a needle electrode. The ozone density relationship diagram with respect to the number of stitches at each position. The ozone density | concentration relationship figure with respect to a primary side voltage. The ozone density relationship figure with respect to elapsed time.

Explanation of symbols

1 Ozone generator (main unit)
2 High Voltage Power Supply 3 Oscillator 4 Ceramic Transformer 5 Primary Side Electrode 6 Drive Unit 7 Secondary Side Electrode 8 Power Generation Unit 9 Needle Electrode 10 Ozone Generation Electrode

Claims (7)

An ozone generator (1) integrally including a high voltage power source (2) and an ozone generating electrode (10), the high voltage power source (2) comprising a ceramic transformer (4), and an ozone generating electrode ( 10) An ozone generator characterized in that the secondary electrode (7) of the ceramic transformer (4) is commonly used as a flat plate electrode, and comprises a plurality of needle electrodes (9) provided opposite to each other. An ozone generator (1) having a high voltage power source (2) and an ozone generating electrode (10) integrally provided on a base, the high voltage power source (2) comprising an oscillator (3) and a ceramic transformer (4) The ceramic transformer (4) includes a drive unit (6) in which a primary electrode (5) is formed in the thickness direction and a power generation unit in which a secondary electrode (7) is formed on a side end surface. (8) and the ceramic transformer (4) is supported on a base by a buffer member, and the ozone generating electrode (10) is configured as a plurality of needle electrodes (9), and the secondary electrode ( 7) An ozone generator characterized by being provided opposite to the side end face. 3. The ozone generator according to claim 1, wherein the ceramic transformer (4) has a plate shape and is made of lead zirconate titanate. 4. The plurality of needle electrodes (9) are configured to be horizontally opposed in a straight line to a side end surface which is a secondary electrode (7) of the ceramic transformer (4). Item 4. The ozone generator according to any one of Items 3. The needle electrode (9) is arranged with nine needles consisting of No. 1 to No. 9 needles, and the total width of the nine needles is on the secondary electrode (7) side of the ceramic transformer (4). The ozone generator according to any one of claims 1 to 4, wherein the ozone generator is substantially equal to the width of the end face. The length of the gap in the configuration in which the needle electrode (9) and the secondary electrode (7) of the ceramic transformer (4) are opposed to each other is compared with the center of the needle electrode (9) on both ends. The ozone generator according to any one of claims 1 to 5, wherein the ozone generator is separated. The length of the gap between the needle electrode (9) and the secondary electrode (7) is 1st needle = 9th needle <2nd needle = 8th needle <3rd needle = 4th needle = 5th needle = 6 The ozone generator according to claim 6, wherein the number hand is the number 7 hand.

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