RU2352521C1 - High frequency barrier ozone plant - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: high frequency ozone plant includes clock-signal generator, metal electrode 1 and 2, separated by discharge gap and dielectric barrier. The dielectric barrier is situated on metal electrode 1 from the side of discharge gap. The plant also includes high frequency pulses generator and amplitude modulator. The inputs of amplitude modulator are connected with the clock signal generator outputs respectively, whereas their outputs are coupled with metal electrodes 1 and 2. Besides, the dielectric barrier acts as ultrasonic resonator.

EFFECT: increased efficiency and stability of output operational characteristics preserving simple and reliable design.

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Description

The invention relates to high-voltage pulse technology and can be used in the chemical industry for treating solid and gaseous media with ozone, in medicine for disinfection and deodorization, in agriculture for processing and storing fruits and vegetables with an ozone-air agent, as well as in air conditioning units, refrigeration equipment and etc.

Known ozonizer containing metal electrodes connected to an AC power source. The electrodes are separated by a discharge gap and a dielectric layer. The metal electrodes are chamfered at the edges from the side of the opposite internal surfaces, and the dielectric layer has a negative temperature coefficient of relative dielectric constant (RU 2261837 C2, 2005.10.10).

The main disadvantage of this design is the uneven distribution of the current density of the electric discharge over the entire area of the discharge gap, as well as low efficiency.

Known ozonizer containing a dielectric barrier, on one side of which is the initiating electrode, and on the other - a set of evenly spaced corona electrodes. On the side of the corona electrodes there is an additional dielectric barrier, which forms a channel for input and output of ozonized gas with the barrier. On the other side of the additional dielectric barrier, an additional initiating electrode is located so that between the surfaces of the dielectric barriers and the walls of the corona electrodes, discharge gaps are formed (RU 2263068 C2, 2005.10.27).

The disadvantages of this device is the low efficiency and complexity of the mechanical design of the ozonizer.

The closest analogue of the present invention is an ultrasonic barrier ozonizer containing a clock generator connected to the input of a high-voltage pulse generator by an output, first and second metal electrodes connected to the outputs of a high-voltage pulse generator, separated by a discharge gap and a dielectric barrier, an ultrasonic pulse shaper connected to an output clock generator, ultrasonic resonator, contact leads connected to ultrasound outputs uk pulse shaper and phase synchronization circuit, the input of which is connected to the control output of the ultrasonic pulse shaper, and the output is connected to the control input of the high-voltage pulse shaper, while the dielectric barrier is located on the first metal electrode from the discharge gap side, and the ultrasonic resonator is located on the second metal electrode from the outside (RU 2302370 C1, 07/10/2007).

The disadvantages of this device include the limited frequency range of the excitation of the discharge gap associated with the limiting oscillation frequency of the ultrasonic resonator, as well as the complexity of the mechanical design of the ozonizer.

An object of the invention is the creation of a high-frequency barrier ozonizer with high performance, simplicity of the mechanical structure, with high efficiency and a wide range of uses.

This technical problem is achieved in that in the high-frequency barrier ozonizer containing a clock, the first and second metal electrodes separated by a discharge gap and a dielectric barrier located on the first metal electrode from the discharge gap, a high-frequency pulse generator and an amplitude modulator are introduced, the inputs of which are connected with the outputs of the clock generator and the generator of high-frequency pulses, respectively, and the outputs are connected to the first and second metal electrodes, and the dielectric barrier acts as an ultrasonic resonator.

A functional diagram, as well as voltage plots explaining the operation of a high-frequency barrier ozonizer, are presented in the drawing.

The high-frequency barrier ozonizer contains the first 1 and second 4 metal electrodes separated by a discharge gap 2 and a dielectric barrier 3 located on the first metal electrode 1 from the side of the discharge gap 2, a clock generator 5, a high-frequency pulse generator 6 and an amplitude modulator 7, the inputs of which are connected to the outputs of the clock generator 5 and the generator of high-frequency pulses 6, respectively, and the outputs are connected to the first 1 and second 4 metal electrodes, and the dielectric barrier 3 performs the functions of an ultrasonic resonator.

Description of the operation of the device.

High-frequency barrier ozonizer consists of the first 1 and second 4 metal electrodes. The electrodes 1 and 4 are located in parallel at a certain distance from each other, forming a discharge gap 2 in the form of an air channel, and on the inner surface of the electrode 1 from the side of the discharge gap 2 there is a dielectric barrier 3, which serves as an ultrasonic resonator. This means that when exposed to an alternating electric field, the dielectric barrier 3 is able to perform mechanical vibrations in the ultrasonic frequency range. The metal electrodes 1, 4 together with the dielectric barrier 3 form a single mechanical structure.

The electronic part of the device consists of a clock generator 5, a generator of high-frequency pulses 6 and an amplitude modulator 7. The outputs of the generators 5 and 6 are connected to the corresponding inputs of the modulator 7, the load of which are metal electrodes 1, 4.

The clock generator 5 generates electrical pulses in the ultrasonic frequency range of 20 kHz ... 70 kHz (plot a), which are fed to the first input of the modulator 7. The high-frequency pulse generator 6 generates an electrical signal (b) with a frequency 3 ... 7 times higher than the frequency of the clock generator 5, which is supplied to the second input of modulator 7. As a result, at the output of modulator 7 an alternating voltage of complex shape (c) is formed, which is the sum of two electrical vibrations generated by generators 5 and 6.

In the drawing, the frequency of the pulse generator 6 is shown five times higher than the frequency of the clock generator 5 (f _b = 5f _a ).

The synthesis of ozone in the discharge gap 2 occurs under the influence of an electric signal of complex shape, arriving at the electrodes 1 and 4 from the outputs of the modulator 7 (s), at the time of passage of the barrier discharge through the air channel.

The presence of the ultrasonic component in the electrical signal at the electrodes 1 and 4 causes mechanical vibrations of the dielectric barrier 3, while the presence of high-frequency vibrations facilitates the formation of ozone in the discharge gap 2.

Mechanical vibrations of the dielectric barrier 3 equalize the state of the air-gas medium along the entire discharge gap 2. Due to the intensive mixing of air between the electrodes 1 and 4, effective heat removal takes place from the surface of the dielectric barrier 3, which makes it possible to increase the current density by 1.2 ... 1.3 times in the discharge gap 2 and, at the same time, increase the life of the dielectric barrier 3.

The unevenness of the current densities through the discharge gap 2 depends on the frequency of the applied voltage. At a frequency of 55 ... 90 kHz and higher, the mode of “soft” excitation of the air occurs, as a result of which the formation of nitrogen-containing compounds decreases and the useful yield of ozone increases.

In the process of ozone synthesis using a high-frequency barrier discharge, the level of aero ions approaches the level of the natural background of the air-gas medium.

The proposed device allows you to work at frequencies of 110 ... 230 kHz, regardless of the reference frequency of the ultrasonic resonator.

The proposed design is easy to manufacture, has high efficiency, a wide range of uses, high reliability and a long service life.

High-frequency barrier ozonizer has high performance and stable performance. Its design capabilities allow the manufacture of small-sized, low-voltage portable devices with small dimensions and weight.

In the proposed device, the formation of aeroions and nitrogen-containing compounds is minimized.

Claims (1)

A high-frequency barrier ozonizer containing a clock, first and second metal electrodes separated by a discharge gap and a dielectric barrier located on the first metal electrode from the side of the discharge gap, characterized in that a high-frequency pulse generator and an amplitude modulator are introduced into it, the inputs of which are connected to the outputs a clock generator and a generator of high-frequency pulses, respectively, and the outputs are connected to the first and second metal electrodes, and the dielectric barrier acts as an ultrasonic resonator.