JPH0269304A - Ac-driven pulse ozonizer - Google Patents

Abstract

PURPOSE:To stably and surely generate a small amt. of gaseous O3 for a long time by connecting a secondary side of a transformer to an ozonizer electrode obtained by interposing a dielectric between a couple of electrodes, and connecting a thyristor and a capacitor to a primary-side coil under a specified condition. CONSTITUTION:The output terminals 2a and 2b of the commercial AC power source 2 is connected through an output transformer 3 to the ozonizer electrode 1 obtained by interposing a plate-like dielectric 1c of ceramic, etc., between a wire-shaped electrode 1a material and a surface-like electrode 1b of conductive material. A series circuit consisting of a capacitor 4 and a bilateral thyristor 5 is connected in parallel to the primary-side coil 3a of the transformer 3, and a pulse voltage group with the changing cycle is intermittently impressed on the electrode 1. When the pulse voltage group is impressed on the coil 3a, the boosted pulse voltage generated in the secondary-side coil 3b is impressed between the electrodes 1a and 1b, a silent discharge is generated, and O2 is converted to O3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to deodorizing the inside of a food refrigerator or its pond, and to improving an ozonizer used on the tiers of food stored therein. It is.

More specifically, when a high-voltage power source is connected to an ion generating element comprising a pair of electrodes, the ions generated between the electrodes are used to convert oxygen gas supplied therein or oxygen in the air into ozone gas. It is a device.

2. Description of the Related Art Conventional ozonizers of this type have a dielectric interposed between a pair of electrodes to form an ion generating element, and a DC power source is connected to the ion generating element via a pulse generating circuit to create an ion generating element between the two electrodes. Since discharge is generated, unless the voltage of the DC power supply is above a certain level, the discharge between the two electrodes will become unstable, which may impede the generation of ozone gas. Therefore, in order to stabilize the discharge, it is necessary to increase the power supply voltage of the DC power supply above a certain level, but if you do this,
This time, too much ozone gas is generated, and if this ozonizer is installed inside a refrigerator, there is a risk that the odor of ozone gas will spread around the refrigerator when the door is opened.

Problems to be Solved by the Invention In the conventional invention, since a DC voltage is applied between a pair of poles via a DC high-voltage pulse generation circuit, the above-mentioned instability of ozone gas generation or Items that tend to generate excessive amounts of ozone and require stable generation of trace amounts of ozone;
For example, it is unsuitable for deodorizing refrigerators.

An object of the present invention is to obtain an ozonizer that can stably and reliably generate a small amount of ozone gas over a long period of time so as to be suitable for use in refrigerators and the like.

The purpose of the ozonizer is to omit the rectifier that is essential for obtaining DC power from a commercial power supply, to reduce power consumption compared to the conventional ozonizer, and to obtain a compact and inexpensive ozonizer.

Means for Solving the Problems The AC drive type ozonizer of the present invention has a secondary side of a transformer coupled to an ozonizer tw1 formed by interposing a dielectric between a pair of electrodes, and a thyristor and a thyristor connected to the primary coil of the transformer. A series circuit consisting of a capacitor is connected in parallel and is driven by an alternating current voltage.

For example, when a sinusoidal AC voltage from a commercial power supply is applied from an AC power source to a capacitor connected to both ends of the capacitor, and the charging voltage of the capacitor exceeds the limit voltage of the thyristor, the thyristor becomes conductive and the primary coil of the output A pulse current is applied to the capacitor, and at that moment the voltage of the capacitor is reduced to zero.

The next moment, the capacitor starts charging with the current from the power supply, but since the charging current is limited by the resistance interposed between the capacitor and the power supply, there is a slight delay in the process of the voltage rising from zero. During this period, the thyristor returns to its non-conducting state and stops the current flowing through the primary coil of the output transformer.

In this way, a pulse voltage is supplied to the primary coil of the transformer.

At the next moment, the capacitor starts charging again from the AC power supply, generating the pulse voltage mentioned above, and thereafter repeats this until the instantaneous value of the AC power supply voltage becomes equal to or less than the conduction voltage of the thyristor. Generates a group of pulse voltages. Thereafter, the AC power supply voltage is stopped again until the instantaneous value reaches the conduction voltage of the thyristor, and when the conduction voltage is exceeded, a pulse voltage group is supplied to the transformer through the same process as described above.

In this way, the pulse current flowing through the primary side of the transformer is transformed in voltage as it passes through the transformer, and is supplied to the ozonizer electrode.

At this time, a pulse voltage group is intermittently supplied between the pair of electrodes in the ozonizer electrode, and a silent discharge is generated in the space between the two electrodes on the surface of the dielectric part of the ozonizer electrode, and the voltage is supplied to this space. This process converts oxygen gas or oxygen in the air into ozone gas.

Embodiments The embodiments of this invention will be described with reference to the accompanying drawings.
In the figure, an ozonizer electrode is formed by interposing a flat ceramic dielectric IC made of ceramic or the like between a linear mold 11a made of a conductive material and a planar electrode 1b.
The re-output terminals 2a and 2b of the commercial AC power supply 2 are coupled via the output transformer 3, and the primary coil 3a of the transformer 3
A series circuit consisting of a capacitor 4 and a bidirectional thyristor 5 is connected in parallel to the ozonizer electrode 1, and a pulse voltage group 6 with a changing period t is intermittently applied to the ozonizer electrode 1. FIG. 5 shows a state in which the pulse voltage group 6 is applied intermittently at intervals of a stop time T.

V in FIG. 5 is the voltage curve of the AC power supply. In this voltage curve V, the voltage rises from zero along a sinusoidal waveform, and when the voltage reaches the limit voltage e of the thyristor 5, the thyristor 5 becomes conductive. The electric charge stored in capacitor 4 is
A pulsed current is instantaneously passed through the primary side of the coil.

At that time, the voltage of the capacitor 4 drops to zero, so the thyristor 5 interrupts conduction. Thereafter, the capacitor 4 starts charging again, and when the voltage exceeds the limit voltage e of the thyristor 5 again, the next pulse voltage p is generated through the above-mentioned process. This is repeated to form a pulse voltage group 6 consisting of several pulses, and then the power supply voltage drops along a sine wave and finally drops below the limit voltage e, the thyristor 5 stops conducting and goes in the opposite direction again. The limiting voltage e
This state continues until the stop time T elapses. Then, when the limit voltage e is exceeded, a pulse voltage p in the opposite direction is generated, and the same process is repeated thereafter.

When the intermittent pulse voltage group generated in this way is applied to the primary coil 3a of the output transformer 3, the boosted pulse voltage generated in the secondary coil 3b is applied to the linear shape i1a of the ozonizer electrode 1 and the planar shape. ring! ! i2b, during which a silent discharge 8 is generated as shown in FIG. 3, and at that time, the oxygen gas previously supplied there or the oxygen in the air is converted into ozone gas.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited thereto and can be implemented with some additions and changes to some parts without changing the gist of the present invention.

For example, instead of providing the linear ozonizer electrode 11 [11a] apart from the dielectric 1c as shown in FIGS. 3 and 4, it may also be provided in close contact with the dielectric 1c as shown in FIGS. 6 and 7. do not have.

Further, the shape of each electrode constituting the pair of electrodes may be linear or planar, which can be equivalently considered as a surface, for example, a grid.

Further, instead of coupling the capacitor 4 and thyristor 5 at the positions shown in FIG. 1, although not shown, their positions may be exchanged and coupled.

Also, instead of using an impedance connected in series to the AC power supply 2 with a resistor 2c connected as shown in Fig. 1, an inductance such as a high frequency choke coil 9 is added as shown in Figs. 8 to 11. There is no problem,
As shown in Fig. 8, when a high frequency choke coil 9 is used for the AC power supply 2, the AC power supply voltage waveform forms a sine wave shown on the right side of the AC power supply voltage waveform, and when a capacitor 2d is further connected in series as shown in Fig. 9, The waveform of the AC power supply voltage is lower than that shown in FIG. As shown in Fig. 10, the firing angle control element 2
When e is inserted, the waveform becomes intermittent as shown.

Furthermore, when a rectifier 2f is inserted as shown in FIG. 11, the waveform becomes as shown on the right side.

8 to 11, the high frequency choke coil 9, which is added to the resistor 2c in FIG. This is to ensure that the thyristor 5 returns to the non-conducting state later by suppressing the initial current during the recharging of the thyristor 4 and delaying the rise of the voltage.

Although the use of the high-frequency choke coil 9 in addition to the resistor increases the cost of parts, it is effective in reducing the size of the device because the power that becomes heat loss is significantly reduced.

Note that this high frequency choke coil 9 may also be one in which the current supplement effect is enhanced by utilizing the saturation of a circular outer core of constant inductance.

Furthermore, if a pulse control device 20 as shown in FIG. 12 is inserted between the AC power source 2 and the resistor 2C in FIG. 1, the number of pulses applied to the ozonizer 'r4'Ff11 can be appropriately controlled.

This pulse control device 20 has a pulse rate of, for example, 16 per second.
00 output terminal, an output terminal 26 of SOO per second connected to a rectifier 21, and an output terminal of 400 . and 100 output terminals 2
7.2g, and 29 are provided, and each of these output terminals 25 to 29 can be selectively connected to a swing terminal 30 coupled to one end of the pre-electromotive resistor 2C.

Effects of the Invention The present invention connects the secondary side of a transformer to an ozonizer electrode formed by interposing a dielectric between a pair of electrodes as described above,
The primary coil of the transformer is connected in parallel with a series circuit consisting of a thyristor and a capacitor, and is driven by an alternating current voltage, so that a direct current voltage is applied to the ion generating element via a pulse generating circuit as in the conventional method. Compared to the case where the ozonizer is used for refrigerators, it is possible to stably and continuously generate silent discharge even at low voltage, and it is possible to obtain an ozonizer for use in refrigerators and the like.

In particular, the present invention connects the ozonizer electrode to the output terminal of the AC power supply, so compared to the conventional system, a rectifier which is essential for obtaining DC power from the commercial power supply can be omitted, and the power consumption can be reduced compared to the conventional system. It is possible to obtain a small and inexpensive ozonizer by using less than the conventional ozonizer.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of an AC-driven pulse ozonizer showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of a portion of Fig. 1, and Fig. 3 is a cross section taken along the line lll-■ in Fig. 2. Figure 4 is a cross-sectional view of the IV-IV line in Figure 3, Figure 5 is the voltage curve between the power supply terminals in Figure 1, and the voltage applied between the primary coil of the output transformer and both terminals of the ozonizer electrode. FIGS. 6 and 7 are cross-sectional views of other embodiments of the portions shown in FIGS. 3 and 4, and FIGS. 8 to 11. 1121 is a circuit diagram of an embodiment of a part of the pond, and a line showing the waveform of the AC power voltage generated between both power supply terminals in each case; FIG. 12 is a circuit diagram of a part of the embodiment of FIG. 1; FIG. FIG. 2 is an electrical circuit diagram showing an embodiment of the present invention. 1... Ozonizer electrode t-pole 1a... Linear electrode 1b... Planar electrode lc... Dielectric 2a... Power supply terminal 3... Output transformer 3a...-Next coil 4. Capacitor 5...thyristor

Claims (1)

[Claims] 1. The secondary side of a transformer is coupled to an ozonizer electrode formed by interposing a dielectric between a pair of electrodes, and a series circuit consisting of a thyristor and a capacitor is connected to the primary coil of the transformer. An AC-driven pulse ozonizer characterized by being connected in parallel and driven by an AC voltage. 2. The AC-driven pulse ozonizer according to claim 1, wherein the thyristor is a bidirectional two-terminal thyristor. 3. The secondary side of a transformer is coupled to an ozonizer electrode formed by interposing a dielectric between a pair of electrodes, and a series circuit consisting of a thyristor and a capacitor is connected in parallel to the primary coil of the transformer. At the coupling part of the thyristor and the capacitor, and at the other end of the capacitor,
An AC-driven pulse ozonizer characterized in that a series circuit consisting of an AC power source and an impedance is connected in parallel and is driven by the AC voltage. 4. The secondary side of a transformer is coupled to an ozonizer electrode formed by interposing a dielectric between a pair of electrodes, and a series circuit consisting of a thyristor and a capacitor is connected in parallel to the primary coil of the transformer. An AC-driven pulse, characterized in that a series circuit consisting of an AC power source and an impedance is connected in parallel to a coupling part of a thyristor and a capacitor and the other end of the thyristor, and is driven by the AC voltage. ozonizer. 5. The AC-driven pulse ozonizer according to claim 3 or 4, wherein the impedance is a resistance. 6. The AC-driven pulse ozonizer according to claim 3 or 4, wherein the impedance includes inductance.