TW520342B - Ozone generator - Google Patents

Abstract

There is provided a small and light ozone generating apparatus capable of producing ozone with much less consumption of electric power. The present invention comprises a pulse generator for generating high-voltage pulses and a discharge chamber for inducing electrical discharge in response to the high-voltage pulses. The pulse generator includes an LC circuit for compressing square wave signals and generating impulses. The use of impulse greatly reduces electric power consumption and volume of ozone generating apparatus. Electrical discharge takes place between an electrode plate and grounded chamber wall. A sheet of oxide dielectric covers the chamber wall to prevent corrosion of chamber wall.

Description

V. Description of the invention (1) Technical field In particular, the present invention relates to an ozone generator, an ozone generator, which is lightweight and has low power consumption. Stinky milk (〇3) is quite stable at room temperature and pressure, and is easily decomposed into oxygen molecules (〇2), that is, has strong oxidizing property. Because of the characteristics of oxygen /, it is widely used in the fields of water purification treatment, air oxygen purification, deodorization, and bleaching. In order to produce ozone more efficiently, various methods have been disclosed. The amount of odorous oxygen produced by ozone is known to be related to various factors such as the density of the reacting oxygen, the applied electric field, temperature, and gas flow. Ozone generators generate ozone by applying powerful energy to air with oxygen, and by electrical discharge. Depending on how the energy is applied, ozone generators can be roughly divided into two types: one is using ultraviolet (υν), and the other is using high electric fields in the air that can cause corona discharge. The method using ultraviolet rays has disadvantages such as weak durability and short life time, because the ultraviolet lamp for generating ultraviolet rays is difficult to be miniaturized and easily damaged. In contrast, the method using corona discharge has good energy efficiency, stable performance, and easy operation and control. Therefore, almost all ozone generators now use corona discharge. Generally speaking, the ozone generator based on corona discharge is mainly composed of a pulse generating circuit for generating high voltage pulses necessary for discharge, and a discharge that can discharge ozone by discharging after air or pure oxygen flows in. Room composition. Fig. 1 is a schematic diagram showing the structure of a conventional ozone generator. In the figure, the ozone generator 100 is composed of a ground electrode 110, an insulating layer 120, a high voltage 520342, and a description of the invention (a pressure electrode 130, a high-voltage pulse generating unit 14 and an AC power source 15). First, let the air be continuous Between the ground electrode 100 and the insulating layer 12G in the flowing chamber (not shown), and then, by applying a high voltage between the ground electrode 100 and the local voltage electrode 13o, oxidation can be performed by electrical discharge. Oxygen in the air generates ozone. The inter-voltage pulse generator 14 is a sine wave or rectangular wave generated by receiving AC power from an AC power source 15. For example, it will increase to a high voltage of 3 to 20KV plus Between the ground electrode 100 and the high-voltage electrode 13o, in order to prevent a local arc from occurring between the insulating layer 120 between the two electrodes 1110 and 13o to which a high voltage is applied, it must be caused across the entire area of the electrode. The same discharge. Therefore, the high-voltage pulse generator 14 must have a transformer with a high coil ratio necessary to generate a plasma discharge. However, the high-voltage pulse is generated by the high coil ratio of the transformer. The size of the section 14 will become larger. In this way, heat dissipation becomes necessary, so it has the disadvantage of increasing power consumption. In addition, a tube-type ozone generator has been disclosed, and the tube-type ozone generator is regarded as the first. The modified example of the discharge chamber in the figure has a tubular insulating layer made of glass, quartz, etc., and is widely used in large-capacity applications. However, this tube-type ozone generator is due to the principle of ozone generation and Figure i is the same, so it also has the problem that it is difficult to miniaturize the ozone generator. Also, in the ozone generator, part of the electrical energy must be converted into thermal energy during discharge, so the temperature of the discharge chamber will be increased, and Low ozone production efficiency. With such a temperature increase, the rate of reduction to oxygen molecules will also increase. Therefore, in order to increase the ozone production efficiency, the discharge chamber is cold 520342 V. Invention description (3) becomes necessary, that is, It is necessary to separately install an air-cooled or water-cooled cooling device, which has the disadvantage of increasing the size and complexity of the ozone generator. Also, generally, in order to inject dry air into the discharge chamber Inside, a dehumidifier is used. When the humid air flows into the interior of the discharge chamber, the moisture contained in the air will react with the odor generated by the discharge chamber to generate nitric acid (HNO3). Therefore, the wall of the discharge chamber will be corroded. , And shorten the life of the odor generator. In order to prevent the corrosion of the wall of the discharge chamber, in addition to the dehumidifier, stainless steel (such as SUS316) with high corrosion resistance is used as the material of the discharge chamber wall. However, due to the life of the material It is not permanent, and the discharge chamber must be cleaned or replaced periodically, which is quite troublesome and increases the manufacturing cost of the odor generator. The main object of the present invention is to provide a small type with high ozone generation efficiency using a pair or one high voltage electrode In order to achieve the above-mentioned object, the ozone generator of the embodiment of the present invention includes a pulse generating device for generating high-voltage pulses, and a pulse generator for generating high-voltage pulses. A discharge chamber that is pulsed to induce electrical discharge. Wherein, the discharge chamber is provided with at least one electrode plate, at least one insulating plate, an injection port for externally injecting air with oxygen, and an ozone chamber for generating electricity generated by the electrical discharge of the discharge chamber. Exhaust vent from outside. At least one of the electrode plates is composed of a pair of electrode plates which are arranged on a surface parallel to the upper and lower walls of the discharge cell. In addition, according to an embodiment of the present invention, the at least one electrode plate is composed of a pair of upside-down electrode plates parallel to the upper and lower walls of the discharge cell, and the pair of electrodes

V. Description of the invention (4) The electrode plate holds a ground plate. The pulse generating device has a rectangular wave generating member that generates a rectangular wave using a voltage applied from an external power source, and an LC circuit composed of a plurality of pairs of inductors and capacitors connected in parallel with each other. At this time, the inductance value of the inductor is set so that when the voltage of the capacitor becomes the maximum, the inductance just reaches the saturation region. Brief Description of the Drawings Figure 1 is a schematic diagram of the structure of a conventional ozone generator. Fig. 2 is a schematic diagram of a preferred embodiment of the ozone generator of the present invention. Figures 3A to 3C are waveform diagrams showing the voltage waveforms of nodes a, B, and C in Figure 2. Fig. 4 is a waveform diagram showing a high-voltage pulse generated by the high-voltage pulse generating section in Fig. 2. Fig. 5 is a detailed schematic diagram of the high-voltage pulse generating section in Fig. 2. Fig. 6 is a detailed schematic diagram of the discharge cell in Fig. 2. Fig. 7 is a sectional view showing the structure of a discharge cell according to another embodiment of the present invention. Fig. 8 is a sectional view showing the structure of a discharge cell according to still another embodiment of the present invention. Hereinafter, the preferred embodiments of the present invention will be described in detail while referring to the attached drawings. Figure 2 is a schematic diagram of a preferred embodiment of the ozone generator of the present invention. As shown in Fig. 2, the ozone generator of the present invention is composed of a circuit section 5. Invention description (5) 200 and a discharge chamber. This circuit unit uses electric power applied from an external power source 260 to generate a high voltage which is supplied to the discharge chamber. In the discharge chamber, air or oxygen is injected into the interior, and then ozone is generated by electrical discharge. The rectangular wave generating section 2H) and a high-voltage pulse generating section 220 that generates a high-voltage pulse by compressing the rectangular wave. As shown in Fig. 2, the rectangular wave generating section 210 is a rectifying section 23 (), which can rectify the ac voltage supplied from the external power source 26, into a DC voltage, a wave-cutting section, and—and more specifically, The circuit part 200 is composed of a driving part 2 50 which is connected between a transistor (T sw) for generating a rectangular wave and used as a power switch. FIG. 3A to FIG. 3C show the second figure, respectively. Waveform diagram of voltage waveforms at nodes A, B, and C. The operation of the circuit section 200 will be described in detail with reference to FIG. 3. The AC voltage applied by the external power source 260 is converted to a DC voltage Va shown in FIG. 3A at the rectifying section 23. Based on the Dc voltage Va, the wave-cutting section 240 generates a rectangular wave voltage Vb as shown in FIG. 3B and supplies it to the gate driving section 250. As a result, as soon as the gate driving part 25 is driven, the transistor Tsw as a power source switch will be in an on state, and its drain will output a high-voltage rectangular wave Vc as shown in FIG. 3c. The period and duration of the rectangular wave Vc are determined by the waveform removing unit 240. The waveform removing section 240 is, for example, a MOS-IC. Fig. 5 is a detailed mode diagram of the high-voltage pulse generating section 220 in Fig. 2. The high-voltage pulse generator 220 is received by the transistor Tsw 520342.

V. Description of the invention (The rectangular wave vc of 0 generates a high-voltage pulse signal. The high-voltage pulse generating unit 220 uses an LC circuit to implement the function of a power compression circuit. The lc circuit usually uses a high-frequency resonance circuit. As we all know, The impedance of the LC resonance circuit does not change with the electric field, but changes with the frequency of the input signal. However, in the power compression circuit used in the present invention, the inductance and capacitance can change with the electric field. That is, The LC circuit (Ci, Ls0) in Figure 5 will increase the voltage across the capacitor as soon as the charge is stored in the capacitor in the previous section. Therefore, the impedance of the inductor Ls! Will be reduced. In more detail, the impedance Zl of the inductor can be ZL = ja) L. Here, L is the ratio of the magnetic permeability of the ferrite core to the number of coils. It is well known that the magnetic permeability is related to the magnetic flux density (magnetic induction) B and the magnetic field strength BH hysteresis ring. The inclination of the road is proportional, that is, it has magnetic field dependence. When the magnetic field strength of a ferrite magnet is low, the magnetic permeability # has a high value of several thousand or more. However, as the magnetic field strength becomes larger, it enters the β_Η hysteresis ring. The saturation area of the road's magnetic permeability # will decrease sharply and approach 1. Therefore, the inductance value of the inductor reaching the saturation area will decrease sharply with its impedance, causing a large amount of current to flow directly into the subsequent inductor. Rudi 3C When the rectangular wave Vc shown in the figure is supplied to the high-voltage pulse generating unit 220, each pulse signal will first charge the capacitor cG, and then charge the capacitor Ci through the current-limiting inductor L0. At this time, as the amount of charge in the capacitor Q increases, the capacitor The voltage across the core rises. If the inductance value of the inductor Lsi is set as the voltage across the capacitor Q approaches the maximum, its ferrite core just reaches the saturation region ', then the voltage across the capacitor C! Becomes the maximum, The impedance of the inductor LS1 will be drastically reduced to 1/10 to 1/1000 times. Therefore, by passing the current through 9 V. Invention Description (7) The flow of the inductor Ls!

Press the pulse of Vd. Over-inductance will increase the amplitude considerably through the above process, and the pulse width will be reduced to compress the rectangular wave. Even without increasing the transformer coil ratio, high-voltage pulses can be generated, so the system can be miniaturized. The actual peak voltage of the pulse transmitted toward the discharge chamber is related to the inductance value of the inductor, the capacitance value of the capacitor, and other parameters used by the high-voltage pulse generating section 220. FIG. 6 is a detailed schematic diagram of the discharge cell 300 in FIG. 2. In the figure, the 'discharge chamber 300 is a plate-shaped box having a pair of electrodes 31, a pair of insulating plates 320, an injection port 340, and an exhaust port 350. The pair of electrodes 310 are disposed on the same plane with a predetermined gap therebetween. A pair of insulating plates 320 are hermetically attached to the upper and lower surfaces of the pair of electrodes 31o. The air is injected into the discharge chamber through the injection inlet 340 to become an odor, and then exhausted to the outside through the exhaust port 350. A plate-shaped oxide insulator 37 is fixed to the wall 330 of the discharge chamber 300. A pair of high-voltage electrodes 310 are shown in FIG. 5 and are connected to the output terminal 360 of the voltage transformer THV. The plate-shaped discharge chamber has a wide external surface area of the high-voltage electrode, which can increase the odor generation rate, and because it can be radiated by natural cooling, it is easy to dissipate heat, and there is no need to install a large cooling device. The air with oxygen injected into the discharge chamber 330 through the injection port 340 flows through the gap between the insulating plate 320 and the wall 330 of the discharge chamber 300. When a high-voltage pulse is applied to the pair of electrodes 3 to 10, the oxygen in the air becomes an odor by electrical discharge, and is then exhausted to the outside through the exhaust port 350. In the figure, arrows indicate the direction of air flow in the discharge chamber 300. From the perspective of the equivalent circuit constituting the discharge chamber, since the high-voltage electrode and the wall of the discharge chamber function as the positive and negative electrodes of the capacitor, the air and the insulating plate 320 function as the insulating layer of the capacitor, so the discharge chamber can be regarded as a Large physical capacitance. At this time, before discharge, the full capacitance value of the discharge cell can be expressed by the following formula 1. Equation 1 1 / Cc = l / Ca + 1 / Cd Here, Cc is the full capacitance value of the discharge cell, Ca is the capacitance value of the gap, and Cd is the capacitance value of the insulating plate. A high-voltage electric field is applied between the two electrodes and electric discharge starts. Plasma will occur in the gap between the insulating plate 320 and the wall 330 of the discharge chamber 300, and the gap will function as a conductor by the increase of ions. In this way, the full capacitance of the discharge chamber 300 after the discharge is started can be shown in the following formula 2 Table 11 520342 V. Description of the invention (9). Equation 2 1 / Cc = 1 / Cd As can be understood from the above Equation 2, after the discharge is started, the electric field necessary for the discharge to maintain is smaller than that before the discharge. If the high electric field necessary for the start of the discharge is applied for a considerable period of time after the start of the discharge, it will supply more power than necessary to maintain the discharge, which has the disadvantage of increasing part of the loss of power and generating heat. Therefore, compared with a rectangular wave or a sine wave, a pulse system with a minimum cycle can generate ozone with electric power efficiency. The operation of the discharge chamber 300 will be described in detail below. First, when a pulse is applied between a pair of electrodes 310, an electric field is formed in a vertical direction between each electrode and the upper and lower walls of the discharge chamber 300, and induces a plasma. At this time, since the current flows from the positive electrode to the negative electrode through the wall of the grounded discharge cell, the discharge cell having a pair of electrodes can be expressed as an equivalent circuit having a plurality of capacitances as described above. The hermetically insulated insulating plate 320 fixed to the electrode 310 is used as a discharge barrier 'to make the same discharge across the discharge cell. When there is a gap between the insulating plate 320 and the electrodes 3 and 10, an improper discharge will occur on the side of the discharge cell, that is, a leakage current will be generated between the electrodes, so that the electrodes and the insulating plate may be damaged. In addition, even if there is only a partial gap between the insulating plate 32o and the electrode 3o, there is a possibility that the gap may generate a partial discharge that does not contribute to the generation of ozone, so there is a possibility of generating heat. Therefore, there should not be any gap between the insulation plate and a pair of electrodes, and it should be air tightly fixed. As shown in Fig. 6, the inner wall of the discharge cell is covered with an insulator. 12 520342

V. Description of the invention (10) Since this insulator is made of oxide, it is not only not oxidized by ozone, but also resistant to strong acids such as tris (acid) (HN〇3) generated by the reaction of ozone and moisture in the air. Since it is highly resistant, the wall surface of the discharge chamber can be prevented from being corroded. In addition, as the oxide insulation system, for example, mica can be used. Fig. 7 is a top view showing the structure of a discharge cell according to another embodiment of the present invention. In this embodiment, the difference from FIG. 6 is that a pair of electrodes 410 are respectively juxtaposed up and down parallel to the wall 430 of the discharge cell 400. The electrodes 410 are hermetically sealed by an insulating plate 420, respectively. A ground plate 440 is disposed between the upper electrode assembly and the lower electrode assembly in parallel with each of the assemblies. As in the first embodiment, an oxide insulating plate 450 is fixed to the wall 430 of the discharge cell 400. The capacity of the discharge cell 400 is the same as that of the discharge cell 300 in FIG. The structure of the discharge chamber 400 according to FIG. 7 is an electric field formed in a vertical direction between the wall 430, the ground plate 440, and the electrode 410 of the discharge chamber 400 for grounding. Fig. 8 is a sectional view showing the structure of a discharge cell according to still another embodiment of the present invention. In this embodiment, the difference from the previous two embodiments is that only one electrode is used. In the figure, a high-voltage electrode 51 is attached to the lower wall 520 of the discharge chamber 500, and the upper wall 530 of the discharge chamber 500 is grounded. At this time, the lower wall 520 of the discharge cell 500 where the electrode 510 is disposed is made of a non-conductive material (such as Teflon) which can be insulated from other walls of the discharge cell 500. The wall surface of the discharge cell 500 containing the electrode 510 is covered with an oxide insulating plate 540. According to the structure of the discharge cell 500, a high-voltage pulse is applied between the upper wall 530 of the discharge cell 500 and the electrode 510 to discharge. In this embodiment, there is only a single electrode arranged in the discharge chamber, so 13 520342 V. Description of the invention (11) The volume is smaller than that of the discharge chamber in Figure 6 and Figure 7, so the voltage necessary for discharge can be reduced. , And further reduce power consumption. In addition, in this embodiment, in order not to cause damage to the insulator, the high-voltage electrode 510 and the lower wall 520 of the discharge cell 500 are preferably arranged at a slight gap. The experimental results of specific examples of the present invention are shown below. These exemplifications are only used to explain the present invention, so the scope of application of the present invention cannot be limited to the exemplifications. < Experimental Example 1 > In Experimental Example 1, when the ozone generator shown in Fig. 6 was used, the amount of ozone generated and power consumption were measured. First, an AC current of 220V is rectified by a bridge rectifier into a DC current of 300V. This DC current is converted into a rectangular wave by the wave-cutting section 240 and a 15V Zener diode. Then, it is applied to the input terminal of the gate driving circuit section 250 to drive the gate of the transistor Tsw for power switching. pole. At this time, the rectangular wave has a pulse width of 2 m & and a period of 0.2 m seconds. With the rectangular wave, the peak voltage of the pulse output by the electrode of the transistor as the power switch is 500 ~ 600V. The passive components of the high-voltage pulse generating unit 22 in the figure 5 are: C0 = 0.1 ~ 〇4F, L〇 = (L5mH, Ci = 17nF, L "= 2 ~ 4mH, 2 13nF, ~ (^ ~ ( ^ Grasp and 'are set to a value that can integrate the impedance of the high-voltage pulse generator with the discharge chamber. The Λ-circle ratio of the high-voltage transformer THV is 7 to 13. Thus, the peak voltage of the pulse transmitted to the discharge chamber is KV The half value of the pulse is the full-width chaotic boundary. The μ leg f is 0.25 to 0.5 μs. The insulating plate 14 attached to the high-voltage electrode 14 520342

5. Description of the invention (12) The dielectric constant is 8.0 'and the thickness is 0.1 ~ 02mm. The area of each electrode was 80 mm x 40 mm. The gap between the wall of the discharge chamber and the insulation plate is 0.5 to 1.0 mm. The size of the discharge cell made from this is

150mmxl50mmxl5mm, the overall size of the ozone generator is 220mmx250mmxl25mm, and the power consumption is 80W. The amount of ozone generated using the ozone generator is determined by UV sensing. Will be temperature 25. 〇The dry ozone was measured at a rate of 3.5 to 4.5 g per unit time while flowing into the discharge chamber at 20 liters each time. The amount of ozone measured while flowing into pure oxygen was 8 to 12 g per unit time. Compared with existing commercial products that show the same amount of odor, the measurement result of the ozone generator is 1/2 to 1/10, and the power consumption is reduced by ι · 5 to 10 times. < Experimental Example 2 > In Experimental Example 2, the amount of ozone generated was measured using an ozone generator having a discharge cell structure shown in Fig. 7. The experimental conditions in this example are the same as those in Experimental Example 1. It is proved by experiments that almost the same amount of ozone can be obtained.

The above is the description of the best embodiment of the present invention, and those skilled in the art can make various changes without departing from the scope of the patent application of the present invention. Therefore, according to the present invention, not only pulses can be applied to the discharge chamber, but also low power consumption can increase the ozone generation rate, thereby reducing the volume of the ozone generator. Furthermore, by the electric discharge caused by an electric field formed between a pair of high-voltage electrodes and the wall of the discharge chamber, the ozone generation rate can be increased. Also according to the present invention, since the shape of the discharge chamber is plate-like, it is easy to be miniaturized. Also, because the external surface area of the high-voltage electrode is wide, not only the rate of occurrence of two ozone can be increased, but also heat can be dissipated by natural air cooling. Additional 15 520342 is required. V. INTRODUCTION (π) Large cooling device is installed. Therefore, the ozone generator will be miniaturized. In addition, an oxide insulator is adhered to the wall surface of the discharge chamber in this case, which can prevent the wall surface from being corroded. Therefore, even if the air is not injected with dehumidification, the durability of the discharge chamber will not be affected, and the aluminum material with low processing cost can replace the expensive corrosion prevention metal, reducing the manufacturing cost of the ozone generator. DESCRIPTION OF SYMBOLS 100 ... ozone generator 3 5 0 ... exhaust port 110 ... ground electrode 360 ... output terminal 12 0 ... insulating layer 370 ... oxide insulator 130 ... high voltage electrode 410 ... Electrode 140 ... High-voltage pulse generating section 420 ... Insulation plate 150 ... AC power supply 440 ... Grounding plate 200 ... Circuit section 450 ... Oxide insulating plate 210 ... Rectangular wave generation Section 510 ... High-voltage electrode 220 ... High-voltage pulse generating section 520 ... Lower wall 230 ... Rectifying section 530 ... Upper wall 240 ... Waveform removal section 540 ... Oxide insulating plate 250 ... brake drive unit 260 ... external power supply 300, 400, 500 ... discharge chamber 310 ... electrode 320 ... insulation plate 330,430 ... discharge chamber wall 340 ... injection port 16

Claims (1)

6. Scope of patent application 1 · -Type: An oxygen generator includes a pulse generating device for generating a high-voltage pulse and a discharge chamber for inducing electrical discharge in accordance with the aforementioned high-voltage pulse; wherein the discharge chamber is It is provided with at least one electrode plate, at least one insulating plate, an exhaust port for externally injecting air with oxygen, and an exhaust port for ozone generated by the electrical discharge of the discharge chamber to be discharged to the outside. 2. The ozone generator according to item 1 of the scope of the patent application, wherein the at least one electrode plate is composed of an electrode plate that is opposite to and placed on a plane parallel to the discharge chamber. 3. The ozone generator according to item 1 of the scope of patent application, wherein the at least one electrode plate is composed of a pair of electrode plates juxtaposed up and down parallel to the upper and lower walls of the discharge chamber, and the _ pair of electrodes The board held a ground plane. 4. If the patent application is for the ozone generator of item 2 or item 3, the at least one insulating plate is fixed above and below the at least one electrode plate. 5. If the ozone generator is the oldest in the scope of patent application, wherein the at least one electrode plate is an electrode plate fixed on the lower wall of the discharge chamber. >. If the ozone generator of item 2 of the patent application scope, wherein the wall of the discharge chamber is grounded, the high voltage pulse is applied between the pair of electrode plates, and the electrical discharge is generated from the -counter electrode Between the board and the wall. If the ozone generator of the patent application item 3, wherein the wall of the discharge chamber is grounded, the high voltage pulse is applied between the pair of electrode plates, and the electrical discharge is generated by the pair of electrode plates and Between the walls and between the pair of electrode plates and the ground plate within the scope of the patent application. 8.t The ozone generator with the scope of patent application No. 5 wherein the upper wall of the discharge chamber is grounded, the high voltage pulse is applied between the electrode plate and the upper wall Q 'and the electrical discharge is generated in the Between the electrode plate and the upper wall. In the ozone generation m of the scope of the patent application, the pulse generation is further provided with a rectangular wave generating member for generating moments / waves by a voltage applied by an external power source, and the high voltage pulse is compressed by compressing the Rectangular wave. 10 · The ozone generator of item 9 in the scope of patent application, wherein the pulse generating device has an LC circuit composed of a plurality of pairs of inductors and capacitors connected in parallel with each other, and the inductance value of the inductor is set When the maximum value of the capacitor is reached, the inductor just reaches the saturation area. U. If the ozone generator of item 1 of the scope of patent application, the wall of the discharge chamber in 纟 is covered with an oxide layer. • The ozone generator as claimed in item 11 of the patent, where the oxide layer is composed of mica. 18