JPH05116906A - Ozone generator - Google Patents

Abstract

PURPOSE:To provide the ozone generator having a negative ion generating function and a dust collecting function. CONSTITUTION:An induction electrode 2 is formed on one surface of a base body 1 consisting of a dielectric substance and a discharge electrode 3 is formed on the other surface to constitute an ozonizer OZ. A high voltage vibrating in the state of maintaining the discharge electrode 3 at a negative potential is impressed between the discharge electrode 3 and the induction electrode 2 from a power source 7 to generate a silent discharge along the discharge electrode. The region where the silent discharge arises is a plasma region where the quantity of negative ions is larger than the quantity of positive ions. Gas contg. oxygen is brought into contact with the discharge to generate ozone. A collecting electrode 4 is disposed near the ozonizer OZ. The dust in the gas is electrified negative and the electrified dust can be attracted to the collecting electrode 4 if the collecting electrode is maintained at the same potential as the potential of the induction electrode 2 or at the positive potential with respect to the induction electrode. The dust collecting function is, therefore, provided to this ozone generator.

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 applying an AC high voltage between an induction electrode and a discharge electrode to generate a discharge along the discharge electrode.

[0002]

2. Description of the Related Art Ozone is used for the purpose of purifying air by removing bad odors and sterilization of indoor air.
An ozone generator used for purifying air is an ozonizer in which an induction electrode and a discharge electrode are formed on one surface and another surface of a substrate made of a dielectric material such as ceramic, and an AC high voltage is applied between both electrodes of the ozonizer. It is composed of a driving power supply for applying. When using an ozone generator to purify indoor air, use an air cleaner equipped with a dust collection filter to remove dust in the air in addition to deodorizing and sterilizing the indoor air. Is normal.

The drive power source used in the conventional ozone generator generates an AC high voltage with positive and negative potentials alternating, and by applying the AC high voltage between both electrodes of the ozonizer. A silent discharge is generated in the vicinity,
The oxygen in the air was ozonized.

Recently, attention has been paid to the effect of negative ions contained in the indoor air on health, and an air purifying device having a negative ion generating device has been used.

[0005]

Since the conventional ozone generator has only a function of simply generating ozone, when deodorizing, sterilizing and dust removing the air in the room to purify the air, It was necessary to install a separate air cleaner. However, the conventional air cleaner is a system that mechanically captures dust with a mesh or cloth filter, so the dust removal effect is not sufficient, especially when the air contains fine particles such as cigarette smoke. In addition, the fine particles could not be sufficiently removed.

[0006] As a dust collector capable of removing fine particles, there is an electric dust collector, but since the electric dust collector is very expensive, if an electric dust collector is provided in addition to the ozone generator. The cost of equipment is unavoidably high.

Further, since the conventional ozone generator does not have a function of generating negative ions, it is necessary to separately provide a negative ion generator when supplying the negative ions into the room.

An object of the present invention is to provide an ozone generator having a function of generating negative ions.

Another object of the present invention is to provide an ozone generator having an excellent dust collecting function, which can surely remove fine particle dust without separately providing an electric dust collector.

[0010]

The ozone generator of the present invention comprises an ozonizer in which an induction electrode is formed on one surface of a substrate made of a dielectric material and a discharge electrode is formed on the other surface, and a discharge electrode of the ozonizer is a negative electrode. It is composed of a negative potential drive power source for applying a high voltage that oscillates while maintaining the potential between the induction electrode and the discharge electrode.

The base of the ozonizer may be formed in a flat plate shape or a cylindrical shape. When the base of the ozonizer is formed in a cylindrical shape, an induction electrode may be formed on the inner peripheral surface of the base and a discharge electrode may be formed on the outer peripheral surface of the base, and the discharge electrode may be formed on the inner peripheral surface of the base. Induction electrodes may be formed on the respective electrodes.

When the ozone generator has a dust collecting function, a dust collecting electrode kept at the same potential as the induction electrode or at a positive potential with respect to the induction electrode is arranged near the ozonizer.

The dust collecting electrode may be formed in a cylindrical shape surrounding the ozonizer from the outside. Also in this case, the potential of the dust collecting electrode is maintained at the same potential as the induction electrode or at a positive potential with respect to the induction electrode.

When the base of the ozonizer is formed in a cylindrical shape and the discharge electrode is provided on the inner peripheral surface thereof,
It is preferable to dispose a rod-shaped dust collecting electrode inside the substrate so that the potential of the dust collecting electrode is maintained at the same potential as the induction electrode or at a positive potential with respect to the induction electrode.

The dust collecting electrode may be made of a metal or a dielectric material, and may be made of a dielectric material and a metal electrode layer bonded to the dielectric material. The dust collecting electrode can also be formed in a net shape.

A plurality of ozonizers may be provided. The dust collecting electrode can also be formed in a mesh shape or a grid shape.

The negative-potential drive power supply includes, for example, an output transformer having a primary coil and a secondary coil, which outputs an AC high voltage of a predetermined frequency to the secondary coil of the output transformer, and an output transformer. A first diode whose cathode is connected to one end of a secondary coil; and a second diode whose anode is connected to the anode of the first diode and whose cathode is connected to the other end of the secondary coil;
It can be configured with a capacitor connected to both ends of the first diode. In this case, at least one ozonizer is connected to both ends of the second diode with its discharge electrode facing the anode side of the second diode.

The negative potential drive power supply also includes a primary coil and a secondary coil.
A power supply circuit including an output transformer having a secondary coil and outputting an AC high voltage having a predetermined frequency to a secondary coil of the output transformer, and a first diode having an anode connected to one end of the secondary coil of the output transformer. , An anode and a cathode are respectively connected to the other end of the secondary coil and a second diode connected to the cathode of the first diode. In this case, at least one ozonizer is connected to both ends of the first diode and both ends of the second diode, with the discharge electrodes facing the anode side of the respective diodes.

[0019]

In the above ozone generator, when a voltage is applied from the negative potential driving power source between the discharge electrode and the induction electrode of the ozonizer, silent discharge is generated along the discharge electrode. When a gas containing oxygen such as air is supplied between the discharge electrode and the dust collecting electrode, the oxygen in the gas contacts the discharge and becomes ozone.

In the present invention, since the discharge electrode is kept at a negative potential with respect to the induction electrode by using the negative potential driving power source, the region where the silent discharge is generated is the negative electric field plasma region, and Also, the amount of negative ions is increasing. Since a large number of surplus negative ions exist in the region where the silent discharge is generated as described above, the negative ions can be easily taken out and supplied into the air together with ozone. To extract negative ions, for example, a grid positively biased with respect to the induction electrode may be arranged near the ozonizer.

As described above, since a large number of surplus negative ions exist in the region where the silent discharge is generated, when dust in the gas passes near this region, the dust is given a negative charge. Since the dust collecting electrode has a positive potential when viewed from the negatively charged dust, the charged dust is adsorbed and captured by the dust collecting electrode by the Coulomb force.

As described above, according to the ozone generator of the present invention, by adding the dust collecting electrode, ozone can be generated and at the same time, the dust removal process of the gas can be performed. Therefore, the ozone filter is also used. Without doing so, a clean gas containing ozone can be obtained. Further, in the present invention, since negatively charged dust is captured by the dust collecting electrode by the Coulomb force, ultrafine particles such as cigarette smoke can be captured without any problem without separately providing an electric dust collector.

Further, when the negative potential driving power source is configured as described above, the negative potential driving power source can be configured by an extremely simple circuit, so that the power source can be made compact and lightweight, and the cost can be reduced.

[0024]

1A and 2 schematically show the structure of an embodiment of the present invention. In this embodiment, a flat plate-shaped substrate 1 is used.
The ozonizer OZ is composed of the induction electrode 2 formed on the one surface 1a of the base body 1 and the discharge electrode 3 formed on the other surface 1b of the base body. A flat plate-shaped dust collecting electrode 4 is arranged in parallel with the substrate 1 while facing the surface 1b of the substrate 1 on which the discharge electrodes 3 are provided.

The substrate 1 is glass, ceramic (alumina)
The induction electrode 2 and the discharge electrode 3 are formed by a method such as attaching a metal plate or a metal foil to the substrate 1 or applying a conductive paint. In this example, the induction electrode 2 is formed so as to have a large area (planar shape), and the discharge electrode 3 is formed in a linear shape or a strip shape so as to extend in a linear shape along a substantially central portion of the induction electrode 2. There is.

One ends of lead wires 5 and 6 are respectively connected to the induction electrode 2 and the discharge electrode 3 of the ozonizer OZ, and the other ends of these lead wires are connected between the output terminals of the negative potential drive power source 7.

The negative potential drive power source 7 is a power source for generating an AC high voltage that oscillates while maintaining a negative potential state, and the output terminal 7a on the zero potential side of the power source is connected to the induction electrode 2 via the lead wire 5.
Further, the output terminal 7b on the negative potential side is connected to the discharge electrode 3 through the lead wire 6, respectively. The output terminal 7a on the zero potential side of the induction electrode 2 and the negative potential drive power source 7 is grounded.

The dust collecting electrode 4 may be made of a metal or a dielectric such as glass, alumina ceramics or plastic. In this embodiment, the dust collecting electrode 4
Is made of a dielectric material, an electrode 8 is formed at one end thereof, the electrode 8 is connected to a zero potential portion (ground) through a lead wire 9, and the potential of the dust collecting electrode 4 is fixed to the ground potential. .. Even if the potential of the dust collecting electrode 4 is fixed by directly connecting the terminal fitting connected to the end of the lead wire 9 to the dust collecting electrode 4 without forming the electrode 8 on the dust collecting electrode 4. good.

The substrate 1 and the dust collecting electrode 4 are positioned and fixed by a proper means while maintaining a predetermined gap therebetween, and the ozone generating dust collecting section 10 is constituted by the ozonizer OZ and the dust collecting electrode 4. ing. A gas containing oxygen (usually air) is supplied between the substrate 1 and the dust collecting electrode 4.

In this embodiment, the negative potential drive power supply 7 is constructed as shown in FIG. 3, for example. In FIG. 3, P is a power supply circuit for outputting an AC high voltage of a predetermined frequency using a commercial power supply 11 as a power supply, and this power supply circuit includes a self-excited or separately excited oscillator circuit OSC, a primary coil W1 and a secondary coil And an output transformer TR having W2. The output transformer TR may form a part of the oscillation circuit OSC.

The cathode of the first diode D1 is connected to one end T1 of the secondary coil W1 of the output transformer TR, and the cathode of the second diode D2 is connected to the other end T2 of the secondary coil W2. The anode of the first diode D1 and the anode of the second diode D2 are commonly connected, and the capacitor C is connected to both ends of the first diode D1. An output terminal 7a on the ground side is drawn out from the other end T2 of the secondary coil W2, and an output terminal 7b on the non-grounded side is drawn out from a common connection point of the anodes of the first diode and the second diode. The induction electrode 2 of the ozonizer OZ is connected to the output terminal 7a, and the discharge electrode 3 of the ozonizer is connected to the output terminal 7b.

In the negative potential drive power supply shown in FIG. 3, when power is applied to the oscillator circuit OSC, the oscillator circuit OSC oscillates at a predetermined frequency, and an AC high voltage Vo is induced in the secondary coil W2 of the transformer TR. The frequency of the AC high voltage Vo obtained in the secondary coil W2 is appropriately about 5 KHz to 10 KHz, and the peak value of the AC high voltage is 4000 to 8000.
It is preferably set to about V.

In the positive half cycle of the AC high voltage Vo, the secondary coil W2 → capacitor C → diode D2
→ The capacitor C is charged in the path of the secondary coil W2, and in the negative half cycle of the AC high voltage Vo, the secondary coil W2 → Ozonizer OZ → Diode D1 → Secondary coil W
The ozonizer OZ is charged to the polarity shown by the route of 2.
Capacitor C in the positive half cycle of AC high voltage Vo
Is charged, a current flows through the path of capacitor C → ozonizer OZ → secondary coil W2 → capacitor C, and the electric charge of the ozonizer is discharged. If the time between them is sufficiently long, the ozonizer OZ is completely discharged and then charged with the voltage across the diode D2, and the voltage across the same becomes equal to the forward voltage drop (about 0.6 V) of the diode D2. Although the electrode 3 has a slightly positive potential with respect to the ground, if the frequency of the voltage Vo is sufficiently high, the ozonizer is not completely discharged while the capacitor C is being charged, and the discharge electrode of the ozonizer is not discharged. The potential never reverses positively. Therefore, the voltage V23 across the ozonizer OZ is
As shown in FIG. 6, the discharge electrode 3 oscillates in a state in which the discharge electrode 3 is always kept at a negative potential with respect to the ground (zero potential). This has been confirmed in experiments by observing the voltage waveform across the ozonizer.

When a voltage V23 as shown in FIG. 6 is applied between the induction electrode 2 and the discharge electrode 3 of the ozonizer,
As shown in, the silent discharge S is generated along the discharge electrode 2. When the gas containing oxygen such as air supplied between the discharge electrode and the dust collecting electrode comes into contact with the discharge S, oxygen in the gas is ozoned.

The region in which the silent discharge S is generated is a negative electric field plasma region, and since there are more negative ions than positive ions, dust d is included in the gas passing near this region. The dust d is negatively charged. Since the dust collecting electrode 4 has a positive potential when viewed from the negatively charged dust d, the charged dust is attracted and adsorbed by the dust collecting electrode 4. Therefore, the gas passing between the discharge electrode 3 and the dust collecting electrode 4 contains ozone and becomes a clean gas from which dust is removed.

As described above, according to the ozone generator of the present embodiment, the ozone can be generated and at the same time, the dust removal process of the gas can be performed. Therefore, the ozone-containing cleaning agent can be used without using the air filter. It is possible to obtain various gases, and it is possible to remove dust and smoke of fine particles without using an electric precipitator together.

Further, as in the above embodiment, the negative potential drive power supply 7 is constructed by connecting the first and second diodes and the capacitor to the secondary side of the output transformer of the power supply circuit P that generates an AC high voltage. Since the negative-potential drive power supply can be configured with an extremely simple circuit, the power supply can be made compact and lightweight, and the cost can be reduced.

Although only one ozonizer OZ is provided in the above embodiment, a plurality of ozonizers may be provided. In that case, if the capacity of the power supply is sufficient, the diode of the negative potential drive power supply 7 of FIG. Multiple ozonizers can be connected in parallel at both ends of D2.

FIG. 4 shows an example in which the configuration of the power supply circuit P of FIG. 3 is concretely shown. In the circuit shown in FIG. 4, the commercial power source 11
Full-wave rectifier REC that rectifies the output of the capacitor and capacitor C1
And C2, the resistor R1, and the sidac SD form an oscillator circuit OSC.

In the negative potential drive power supply 7 of FIG. 3, when the output of the AC power supply 11 is applied to the rectifier REC, the rectifier R
The capacitor C1 is charged by the output of EC, and the voltage across the capacitor C1 causes the capacitor C2 to pass through the resistor R1.
Is charged with a constant time constant. When the voltage across the capacitor C2 reaches a level that allows the Sidac SD to conduct,
Since the sidac SD becomes conductive, the electric charge of the capacitor C2 is discharged through the sidac SD and the primary coil W1 of the transformer. When the voltage across the capacitor C2 drops due to this discharge, the sidac SD is cut off and the capacitor C2 is charged. Since these operations are repeated, the capacitor C2 -Sidak SD-primary coil W
1- An oscillating current flows in the closed circuit of the capacitor C2 and an AC high voltage Vo is induced in the secondary coil W2. AC high voltage Vo
Can be adjusted by changing the time constant determined by the product of the resistance value of the resistor R1 and the electrostatic capacitance of the capacitor C2, and the peak value can be adjusted by the step-up ratio of the transformer TR.

It is extremely easy to construct a negative potential drive power supply by connecting the first and second diodes and the capacitor to the secondary side of the output transformer of the power supply circuit for generating an AC high voltage as in the above embodiment. Since a negative potential drive power supply can be configured with such a circuit, the power supply can be configured to be small and lightweight,
The cost can be reduced.

FIG. 5 shows another configuration example of the negative potential drive power source used in the present invention. In this example, the transformer TR is used.
The anode of the first diode D1 is connected to one end of the secondary coil W2, and the anode of the second diode D2 is connected to the other end of the secondary coil. The cathodes of the diodes D1 and D2 are commonly connected and grounded.

In the power supply circuit of FIG. 5, the diodes D1 and D
The common connection point of the cathodes of 2 is the output terminal 7a on the ground side. The anode of the diode D1 is the first non-grounded output terminal 7b1 and the anode of the diode D2 is the second non-grounded output terminal 7b2.

When using the negative potential drive power supply of FIG. 5,
Provide at least two ozonizers OZ1 and OZ2,
The induction electrode of the first ozonizer OZ1 and the induction electrode of the second ozonizer OZ2 are connected to the anodes of the diodes D1 and D2. The discharge electrode of the first ozonizer OZ1 is connected to the anode of the diode D1 and the discharge electrode 3 of the second ozonizer OZ2 is connected to the anode of the second diode D2.

In the negative potential drive power supply shown in FIG. 5, when the transformer outputs a positive half cycle voltage, the secondary coil W2 →
A charging current flows through the ozonizer OZ2 through the path of the diode D1 → ozonizer OZ2 → secondary coil W2, and the ozonizer OZ2 is charged so that the discharge electrode 3 side has a negative potential. When the transformer outputs a negative half-cycle voltage, the secondary coil W2 → diode D2 → ozonizer O
A charging current flows through the ozonizer OZ1 through the path of Z1 → secondary coil W2, and the ozonizer OZ1 is also charged so that the discharge electrode 3 side has a negative potential. While the ozonizer OZ2 is being charged through the diode D1, the secondary coil W2
→ Ozonizer OZ1 → Ozonizer OZ2 → Secondary coil W2
The electric charge of the ozonizer OZ1 is discharged through the path of
When the output frequency of the transformer is high, the discharge is not completed during this period, so the voltage across the ozonizer OZ1 does not become zero. Similarly, while the ozonizer OZ1 is being charged through the diode D2, the electric charge of the ozonizer OZ2 is discharged along the path of the secondary coil W2 → the ozonizer OZ2 → the ozonizer OZ1 → the secondary coil W2,
Although the voltage across the both ends of the ozonizer OZ2 decreases, the voltage across the ozonizer OZ2 does not become zero. Therefore, the voltage across the ozonizers OZ1 and OZ2 has a waveform that oscillates with the respective discharge electrodes kept at a negative potential.

In the example of FIG. 5, one ozonizer is connected to both ends of each of the diodes D1 and D2. However, if the capacity of the power supply is sufficient, a plurality of diodes are connected in parallel to each end of each diode. You can also choose to do so.

When the negative potential driving power source is configured as shown in FIG. 5, a plurality of ozonizers can be driven by one negative potential driving power source, so that the configuration of the power source is increased when the ozone generation amount is increased and the dust collecting effect is enhanced. Can be simplified.

In the above embodiment, the dust collecting electrode 4 is kept at the same potential (zero potential) as the induction electrode 2, but as shown in FIG. The dust collection electrode 4 may be kept at a positive potential with respect to the induction electrode 2 by inserting the power source 12 and biasing the dust collection electrode 4 positively with respect to the ground. If the dust collecting electrode 4 is kept at a positive potential in this manner, the negatively charged dust can be attracted with a stronger force.
The dust removal effect can be increased.

In the above embodiment, in order to facilitate cleaning of the dust collecting electrode 4, it is preferable that the dust collecting electrode 4 can be easily attached and detached. For that purpose, for example, it is preferable that a terminal fitting is connected to the end of the lead wire 9 and the dust collecting electrode 4 is brought into sliding contact with the terminal fitting.

In the example shown in FIG. 1, the dust collecting electrode 4 is the base body 1.
However, as shown in FIG. 7, the dust collecting electrode 4 may have an arc-shaped cross section. When the dust collecting electrode 4 as shown in FIG. 1 or 7 is used, the dust collecting electrode 4 is formed in a net shape and the gas supplied between the substrate 1 and the dust collecting electrode 4 is supplied to the dust collecting electrode 4. You may make it flow out through a mesh.

In the above embodiment, the discharge electrode 3 is composed of one linear electrode, but as shown in FIG. 8A, a large number of linear electrodes 3a, 3a, ... It is also possible to use the discharge electrode 3 including the bridging electrodes 3b and 3c bridging both ends of these linear electrodes. In this case, a planar electrode is used as the induction electrode 2, and the discharge electrode 3 is formed inside the outer edge of the induction electrode 2 in order to widen the region where silent discharge occurs.

As shown in FIG. 8B, the induction electrode 2 and the discharge electrode 3 are each formed in a comb shape, and the discharge electrode 3 is formed between the tooth portions 201 of the induction electrode 2 extending in parallel with each other. The positions of both electrodes may be shifted so that the respective tooth portions 301 are positioned.

In each of the above-mentioned embodiments, the dust collecting electrode 4 is formed so as to have a flat plate shape or a circular cross section, but it is also possible to use a dust collecting electrode having another appropriate shape.
For example, as shown in FIG. 9, a cylindrical dust collecting electrode 4 can be used. In this example, the dust collecting electrode 4 is made of an acrylic resin tube, and the substrate 1 having the induction electrode 2 and the discharge electrode 3 formed therein is inserted into the dust collecting electrode 4.
The base 1 is inscribed in the inner circumference of the dust collecting electrode 4.
One end and the other end of the dust collecting electrode 4 are made of insulating resin 3 respectively.
The first ports 20a and 21a of the one-way joints 20 and 21 are connected by screw connection. Second of one joint 20
The electric wire 22 is connected to the port 20b of the electric wire, one end of the core wire of the electric wire is introduced into the dust collecting electrode 4 through the joint and connected to the discharge electrode 3, and the other end of the core wire is connected to the negative potential drive power source 7
Is connected to the output terminal on the non-ground side (negative potential side).
A gas supply pipe 23 is connected to the third port 20c of the joint 20, and gas is supplied into the dust collecting electrode 4 through the gas supply pipe 23 and the joint 20. An electric wire 24 is connected to the second port 21b of the other joint 21, and one end of the core wire of this electric wire is introduced into the dust collecting electrode 4 through the joint 21 and connected to the induction electrode 2. The other end of the core wire is connected to the ground-side output terminal 7a of the negative potential drive power supply 7. A gas exhaust pipe 25 is provided at the third port 21c of the joint 21.
The gas in the dust collecting electrode 4 is discharged to the outside through the joint 21 and the gas discharge pipe 25. A ground wire 26 is connected to the dust collecting electrode 4 by a screw 27, and the potential of the dust collecting electrode 4 is fixed to zero potential by the ground wire.

In this embodiment, when a gas containing oxygen is supplied from the gas supply pipe 23 into the dust collecting electrode 4 in a state where silent discharge is generated in the vicinity of the discharge electrode 3, oxygen in the gas is ozoned. At the same time, dust in the gas is negatively charged, and the negatively charged dust is captured by the dust collecting electrode 4. Therefore, a clean gas containing ozone and having dust removed is discharged from the gas discharge pipe 25.

Air containing cigarette smoke was supplied from the gas supply pipe 23 into the dust collecting electrode 4 using the apparatus of FIG.
No smoke was observed in the air discharged from the gas discharge pipe 25. Further, it has been clarified that the smoke gush adheres to the inner surface of the dust collecting electrode 4 made of acrylic resin, and the adhered amount increases with the passage of time. From this, it was confirmed that smoke particles contained in the air were negatively charged and captured by the dust collecting electrode.

In the above embodiment, the base 1 of the ozonizer OZ is formed in a flat plate shape, but a cylindrical base 1 may be used as shown in FIG. In this example, the base 1 is made of an alumina ceramic cylinder, and the induction electrode 2 is formed on almost the entire inner peripheral surface of the base 1. The discharge electrode 3 is spirally formed on the outer surface of the base 1. The discharge electrode 3 can be formed, for example, by winding a bare wire around the outer peripheral surface of the base. The base body 1 of FIG. 10 in which the induction electrode 2 and the discharge electrode 3 are formed on the inner peripheral surface and the outer peripheral surface, respectively, is concentrically arranged in the cylindrical dust collecting electrode 4.

FIGS. 11A and 11B show still another embodiment of the present invention using a cylindrical base body. In this example, the outer peripheral surface of the cylindrical base body 1 made of alumina ceramics is shown. The induction electrode 2 is formed on almost the entire surface of the discharge electrode 3 and the spiral conductor is inserted so as to be in close contact with the inner peripheral surface of the base 1.
Are formed. The induction electrode 2 is connected to the ground-side output terminal 7a of the negative potential drive power supply 7, and the discharge electrode 3 is connected to the ground-side (negative potential side) output terminal 7b of the power supply 7.

A first dust collecting electrode 4A extending along the central axis of the base 1 is arranged, and a second dust collecting electrode 4B is arranged in front of the end of the base 1 in the axial direction. There is. The first dust collecting electrode 4A is made of, for example, a round bar made of a dielectric resin such as acrylic, and the second dust collecting electrode 4B is made of a metal net (which may be a dielectric). The first dust collecting electrode 4A and the second dust collecting electrode 4B are connected to the ground-side output terminal 7a of the negative potential drive power source 7. Although not shown, the base 1
Between the second dust collecting electrode 4B and the second dust collecting electrode 4B, there is disposed a guide cylinder for guiding the gas flowing out from the base body 2 to the second dust collecting electrode 4B side. Dust collecting electrode 4
It is designed to pass B.

In the embodiment shown in FIG. 11, when a gas containing oxygen is supplied into the substrate 1, the oxygen in the gas is ozoned by the silent discharge generated in the vicinity of the discharge electrode 3. The dust in the gas is negatively charged, and the negatively charged dust is captured by the dust collecting electrode 4A. The dust (negatively charged) not captured by the dust collecting electrode 4A is captured by the dust collecting electrode 4B when passing through the second dust collecting electrode 4B.

According to the embodiment shown in FIG.
Since it can be performed in stages, the dust collection effect can be enhanced.

In each of the above embodiments, the dust collecting electrode is made of metal or dielectric, but a dust collecting electrode having a composite structure in which a metal plate and a dielectric plate are bonded together may be used. ..

The ozone generator of the present invention having a dust collecting function is used not only for the purpose of obtaining clean ozone gas containing no impurities such as dust but also for cleaning indoor air (deodorization, sterilization and dust removal). ) Can be used for the purpose. When purifying indoor air, if a large amount of ozone is discharged indoors, it may be harmful to human health. Therefore, if a large amount of ozone is discharged, use the ozone generator It is preferable to arrange an ozone decomposition catalyst on the downstream side. FIG. 12 shows an embodiment in which the ozone generator of the present invention is used for the purpose of cleaning indoor air. In FIG. 12, 30 is an air intake port 30a and an exhaust port 3
0b at one end and the other end, and the air intake port 30a and the exhaust port 30b open into the room through openings provided in the wall 31 of the room. A base body 1 provided with a filter 32, an induction electrode 2 and a discharge electrode 3 in a duct 30.
The dust collecting electrode 4 and the ozone decomposing catalyst 33 are provided so as to be sequentially arranged from the upstream side to the downstream side of the air flow in the duct (see the arrow in the drawing), and in the vicinity of the exhaust port 30b. An electric blower fan 34 is arranged. Filter 3
2 is a commonly used mesh or cloth filter,
The relatively large particle dust is mechanically captured by this filter. The dust collecting electrode 4 is made of a metal or dielectric net formed in a flat plate shape. The base 1 is formed in a flat plate shape and is arranged with its plate surface orthogonal to the plate surface of the dust collecting electrode 4. The filter 32 and the dust collecting electrode 4 are in the duct 3
It can be easily pulled out to the outside through a slit-shaped opening provided on the side surface of No. 0. In the illustrated example, only one substrate 1 on which the induction electrode and the discharge electrode are formed is arranged, but a plurality of substrates can be arranged in front of the dust collecting electrode 4.

In the example shown in FIG. 12, in order to facilitate maintenance, the filter 32 of the duct 30, the substrate 1, the dust collecting electrode 4 are provided.
And the block to which the catalyst 33 is attached is flanged to the other part so that the block can be removed from the other part.

In the embodiment of FIG. 12, the air flowing into the duct from the air intake port 30a is brought into contact with the silent discharge generated along the discharge electrode 3 through the filter 32.
As a result, oxygen in the air is ozoned, and at the same time, fine dust in the air is negatively charged. Air is deodorized and sterilized by ozone, and the negatively charged dust is collected by the air collecting electrode 4
When it passes through, it is adsorbed and captured by the dust collecting electrode. The clean gas that has passed through the dust collecting electrode 4 is returned to the room through the ozone decomposition catalyst 33. Ozone is decomposed when passing through the inside of the catalyst 33. Therefore, clean air containing no ozone is discharged from the exhaust port 30b into the room.

In the example of FIG. 12, only one set of ozone generators according to the present invention is arranged in the middle of the duct. However, if necessary, a plurality of ozone generators may be arranged in series.
It is also possible to increase the amount of generated ozone and enhance the dust removal effect. In each of the above embodiments, the dust collecting electrode is provided so as to have a dust collecting function, but it is also possible to exclusively generate ozone and generate negative ions without providing the dust collecting electrode. That is, as described above, when an AC voltage that oscillates while the discharge electrode of the ozonizer is kept at a negative potential is applied between the discharge electrode and the induction electrode, the region where silent discharge occurs becomes the negative electric field plasma region, and in this region, Since there are more negative ions than positive ions, the negative ions can be taken out by arranging a positive potential grid near the ozonizer. For example, in the embodiment of FIG. 1B, if the dust collecting electrode 4 is replaced with a grid (lattice body) made of a conductor, negative ions can be accelerated by the grid and taken out to the outside.

[0066]

As described above, according to the inventions described in claims 1 to 3, a large amount of negative ions can be generated by using the silent discharge region generated along the discharge electrode as the negative electric field plasma region. In addition, ozone can be generated and negative ions can be generated at the same time, and a function as a negative ion generator can be provided.

According to the invention described in claims 4 to 9, since the dust collecting electrode is arranged in the vicinity of the ozonizer, the oxygen in the gas is brought into contact with the silent discharge generated along the discharge electrode to generate ozone. At the same time, the dust contained in the gas can be negatively charged and captured by the dust collecting electrode, and a clean gas containing ozone can be obtained without separately providing an air filter or an electrostatic precipitator. There is an advantage that

Further, in the present invention, the negatively charged dust is captured by the dust collecting electrode by the Coulomb force, so that ultrafine particles such as cigarette smoke can be captured without using an electric dust collector together. ..

Furthermore, in the invention described in claim 11, the negative potential drive power source is simply connected to the secondary side of the output transformer of the power source circuit for generating an AC high voltage by connecting the first and second diodes and the capacitor. In the invention described in claim 12, since the negative potential drive power source can be configured only by connecting the first and second diodes to the secondary side of the transformer, the power source can be configured by an extremely simple circuit. It is possible to configure the power source, and the power source can be configured to be small and lightweight, and the cost can be reduced. In particular, according to the invention as set forth in claim 12, since two or more ozonizers can be driven by one negative potential drive power source, the power source configuration can be simplified when a plurality of ozonizers are provided.

[Brief description of drawings]

FIG. 1A and FIG. 1B are perspective views schematically showing a main part of a different embodiment of the present invention.

FIG. 2 is a side view for explaining the operation of the embodiment of FIG. 1 (A).

FIG. 3 is a circuit diagram showing a configuration example of a negative potential drive power source used in the present invention.

FIG. 4 is a circuit diagram showing an example of a specific circuit configuration of the negative-potential drive power supply of FIG.

FIG. 5 is a circuit diagram showing another configuration example of the negative potential drive power source used in the present invention.

FIG. 6 is a waveform diagram schematically showing changes in the potential of the discharge electrode when the output of the power supply shown in FIG. 3 is applied between the discharge electrode and the induction electrode.

FIG. 7 is a perspective view schematically showing a main part of another embodiment of the present invention.

FIG. 8A and FIG. 8B are perspective views showing different examples of arrangement patterns of discharge electrodes and induction electrodes, respectively.

FIG. 9 is a sectional view showing a main part of still another embodiment of the present invention.

FIG. 10 is a perspective view showing a main part of still another embodiment of the present invention.

FIG. 11A is a side view showing a main part of still another embodiment of the present invention. (B) is a front vertical sectional view showing a configuration of a main part of the embodiment.

FIG. 12 is a cross-sectional view showing an embodiment in the case where the ozone generator of the present invention is used for the purpose of cleaning indoor air.

[Explanation of symbols]

1 ... Substrate, 2 ... Induction electrode, 3 ... Discharge electrode, 4 ... Dust collection electrode, 7 ... Negative potential drive power source, OZ, OZ1, OZ2 ... Ozonizer.

Claims (12)

[Claims] 1. An ozonizer in which an induction electrode is formed on one surface of a substrate made of a dielectric material and a discharge electrode is formed on the other surface thereof, and a high voltage that oscillates while the discharge electrode of the ozonizer is kept at a negative potential is used. An ozone generator comprising a negative potential drive power supply applied between an induction electrode and a discharge electrode. 2. The ozone generator according to claim 1, wherein the base of the ozonizer is formed in a cylindrical shape, and the induction electrode is formed on the inner peripheral surface of the base and the discharge electrode is formed on the outer peripheral surface thereof. apparatus. 3. The ozone generator according to claim 1, wherein the base of the ozonizer is formed in a cylindrical shape, and the induction electrode is formed on the outer peripheral surface of the base and the discharge electrode is formed on the inner peripheral surface thereof. apparatus. 4. The dust collecting electrode according to claim 1, further comprising a dust collecting electrode which is disposed in the vicinity of the ozonizer and is kept at the same potential as the induction electrode or a positive potential with respect to the induction electrode. Ozone generator described in. 5. A cylindrical dust collecting electrode is arranged outside the ozonizer, and the potential of the dust collecting electrode is maintained at the same potential as the induction electrode or a positive potential with respect to the induction electrode. The ozone generator according to 1 or 2. 6. A rod-shaped dust collecting electrode is arranged inside the base of the ozonizer, and the potential of the dust collecting electrode is kept at the same potential as the induction electrode or at a positive potential with respect to the induction electrode. Item 3. The ozone generator according to Item 3. 7. The ozone generator according to claim 4, wherein the dust collecting electrode is made of a metal or a dielectric. 8. The ozone generator according to claim 4, wherein the dust collecting electrode comprises a dielectric and a metal electrode layer bonded to the dielectric. 9. The ozone generator according to claim 4, wherein the dust collecting electrode is formed in a mesh shape or a grid shape. 10. The ozone generator according to claim 1, wherein a plurality of the ozonizers are provided. 11. The negative potential drive power supply includes an output transformer having a primary coil and a secondary coil, and a power supply circuit for outputting an AC high voltage having a predetermined frequency to the secondary coil of the output transformer, and the output. A first diode having a cathode connected to one end of a secondary coil of the transformer; and a second diode having an anode connected to the anode of the first diode and a cathode connected to the other end of the secondary coil. A capacitor connected to both ends of the first diode, and at least one ozonizer connected to both ends of the second diode with its discharge electrode facing the anode side of the second diode. The ozone generator according to any one of claims 1 to 10. 12. The negative potential drive power supply includes an output transformer having a primary coil and a secondary coil, and a power supply circuit for outputting an AC high voltage having a predetermined frequency to a secondary coil of the output transformer, and the output. A first diode having an anode connected to one end of a secondary coil of the transformer, and an anode and a cathode respectively connected to the other end of the secondary coil and the first diode.
A second diode connected to the cathode of the diode, wherein at least one ozonizer is provided at both ends of the first diode and at the both ends of the second diode, respectively, and a discharge electrode is directed to an anode side of each diode. The ozone generator according to claim 10, which is connected in a state.