A micro ozone generator with double-surface dielectric barrier discharge

Abstract

The present invention discloses a micro ozone generator with dual-surface dielectric barrier discharge, which belongs to the technical field of ozone preparation. The device comprises: an ozone generator, a surface electrode, a spiral electrode, a support frame and a cooling fan. By adding a dielectric barrier discharge unit, the gas in the ozone generator is placed in a discharge plasma as much as possible, so that the ozone yield is greatly improved under the same power consumption compared with the single discharge unit, and the ozone concentration generated is higher under the same flow rate. At the same time, under the action of two internal and external heat dissipation channels, the device has the characteristics of low energy consumption, high concentration and large output.

Description

Technical Field

[0001] The invention belongs to the technical field of ozone preparation, and in particular relates to a micro ozone generating device with double-surface dielectric barrier discharge. Background Art

[0002] Ozone and oxygen are allotropes. At room temperature, it is a blue gas with a pungent odor. Ozone is widely used. It can react with many gases in the atmosphere and water. It can be used for environmental pollutant prevention and control, water treatment, food sterilization and disinfection. It can also be used as a reactant in chemical reflection reactions to detect NO, etc. The chemical properties of ozone are mainly reflected in its instability and strong oxidizing properties. Its oxidizing properties are second only to F2. At room temperature, it will decompose naturally after a few hours. When the ambient temperature exceeds 270°C, it will decompose rapidly. Low temperature has a good promoting effect on the stability of ozone. Therefore, the ozone tube is generally cooled when making ozone.

[0003] There are many methods for ozone synthesis, among which the well-known methods are: ozone ultraviolet irradiation method, water electrolysis method and gas discharge. The widely used methods at present are low-temperature plasma discharge body dielectric barrier discharge, surface dielectric barrier discharge and corona discharge method, which have the characteristics of large production output, stability and low power consumption.

[0004] There are a lot of research on ozone generators at home and abroad, and the forms of electrodes are also varied. For example, in order to improve the efficiency of ozone generation, various forms of electrodes such as linear, brush, spiral (CN2804057Y, CN105947989A, CN209161484U), mesh, rotating electrodes (CN204689636U) and electrodes in water and on the surface of water are used; the raw gas is mainly to add a small amount of additives to the oxygen or air source, such as organic matter, oxygen-containing compounds, oxygen-free compounds, etc. The process of low-temperature plasma discharge to produce ozone is affected by various complex factors, but the main reasons affecting the yield are: (1) Ozone generation is a very complex process accompanied by ozone generation and decomposition, and the energy obtained by high-energy electrons in the electric field is not all used to produce ozone. (2) The optimal ozone generation conditions, gas discharge intensity, and kinetic reaction conditions are difficult to achieve. The existing ozone generator has a low yield of ozone, small output, high energy consumption, and a large volume of ozone generator. Summary of the invention

[0005] The main purpose of the present invention is to overcome the shortcomings of the prior art and provide a miniature ozone generator with double-surface dielectric barrier discharge, which fully utilizes the gas in the ozone generator, generates more plasma on the inner and outer surfaces of the dielectric layer to generate more ozone, and has the characteristics of low energy consumption, high concentration and large output.

[0006] The present invention provides a micro ozone generator with double-surface dielectric barrier discharge, which allows the gas in the ozone generator to be in the discharge plasma, can generate ozone to the maximum extent, and can also reduce power consumption. At the same time, cooling is used to control the temperature of the ozone generator at a normal low temperature, reduce the decomposition of ozone, and maximize the ozone yield.

[0007] The technical solution of the present invention is specifically as follows:

[0008] The present invention provides a double-surface dielectric barrier discharge micro ozone generating device, comprising an ozone generating assembly, wherein the ozone generating assembly comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, the outer cylinder (6) and the inner cylinder are both made of insulating materials, and there is a gap between the outer cylinder and the inner cylinder, and the gap forms a spacing channel;

[0009] An inner surface electrode is provided on the inner wall surface of the inner cylinder, and an inner thread electrode is sleeved on the outer wall surface of the inner cylinder;

[0010] An external thread electrode is provided on the inner wall surface of the outer cylinder, and an external surface electrode is provided on the outer wall surface of the outer cylinder, and there is a gap between the internal thread electrode and the external thread electrode;

[0011] The inner cylinder is provided with heat dissipation vents;

[0012] The inner cylinder, the outer cylinder, the inner surface electrode, the outer surface electrode, the inner thread electrode and the outer thread electrode are all coaxially arranged.

[0013] Furthermore, in the above technical solution, a partition is provided at one end of the spacing channel, the partition is arranged between the inner cylinder and the outer cylinder, and a plurality of spacing holes are provided on the partition.

[0014] Furthermore, in the above technical solution, two protrusions are provided on the outer surface of the outer cylinder, the two protrusions are respectively close to two ends of the outer cylinder, and the outer surface electrode is arranged between the two protrusions.

[0015] Furthermore, in the above technical solution, an inner groove is provided on the inner surface of the inner cylinder, the inner surface electrode is provided in the inner groove, and the inner surface electrode is provided correspondingly to the outer surface electrode.

[0016] Furthermore, in the above technical solution, the length of the outer cylinder is smaller than the length of the inner cylinder.

[0017] Furthermore, in the above technical solution, the ozone generating assembly is connected to the first support frame and the second support frame; the two ends of the inner cylinder respectively penetrate the first support frame and the second support frame, and the heat dissipation vent is connected to the air;

[0018] The first support frame is provided with a first vent hole and a first spacing groove connected to the first vent hole, the first spacing groove is annular, the first vent hole is connected to the air, and the first spacing groove is connected to one end of the spacing channel;

[0019] A second vent hole and a second spacing groove connected to the second vent hole are provided in the second support frame, the second spacing groove is annular, the second vent hole is connected to the air, and the second spacing groove is connected to an end of the spacing channel away from the first spacing groove;

[0020] Furthermore, in the above technical solution, a cooling fan is provided outside the outer cylinder.

[0021] Furthermore, in the above technical solution, the width of the spacing channel is 0.1 mm to 2 mm.

[0022] Furthermore, in the above technical solution, the insulating material is selected from one or more of glass, quartz glass, ceramic, enamel, mica, plastic and silicone rubber;

[0023] The inner surface electrode and the outer surface electrode are selected from one or more of a copper electrode, an aluminum electrode, a stainless steel electrode and a gold electrode;

[0024] The internal thread electrode and the external thread electrode are selected from spring electrodes or sawtooth electrodes.

[0025] Furthermore, in the above technical solution, heat sinks are provided on the inner surface electrode and the outer surface electrode.

[0026] After the gas is introduced into the second vent, the gas will flow through the ozone discharge interval channel. The discharge electrode pair composed of the outer surface electrode and the outer thread electrode and the discharge electrode pair composed of the inner surface electrode and the inner thread electrode respectively perform microchannel discharge on the gas in the interval channel at the same time. The discharge intensity and area are twice that of the single dielectric barrier discharge. The gas vortex in the interval channel has a higher ionization efficiency, so the ozone yield will be higher, and the generated ozone will be discharged from the first vent. When the ozone generator is working, there is an airflow through the heat dissipation vent to take away the heat generated by the inner dielectric barrier discharge. The heat dissipation fan also works to continuously take away the heat generated by the outer dielectric barrier discharge.

[0027] The present invention uses surface dielectric barrier discharge to generate ozone. The principle is: under the action of an external AC voltage, micro-discharge first appears on the surface of the dielectric layer. As the voltage increases, the projected area of ​​the micro-discharge on the surface of the dielectric layer continues to increase. Then a breakdown occurs within a few nanoseconds, and an electron avalanche phenomenon occurs. The intrinsic electric field generated by the avalanche electrons weakens the effect of the external electric field, thereby reducing the current intensity, and finally completing a micro-discharge process. The transport process of charged particles and the plasma chemical reaction occur in these micro-discharge channels and decompose oxygen into oxygen atoms, which combine with oxygen to produce a large amount of ozone.

[0028] Beneficial Effects

[0029] The present invention forms a double-surface medium and a double discharge unit by arranging inner surface electrodes and inner thread electrodes inside and outside the inner cylinder, and arranging outer thread electrodes and outer surface electrodes inside and outside the outer cylinder. The medium is an insulating material. When the gas enters the interval channel, the double discharge units discharge the gas in the interval channel simultaneously. The discharge intensity and area are twice that of the single dielectric barrier discharge. The gas vortex in the interval channel has a higher ionization efficiency, so the ozone yield generated will be higher. Moreover, the sleeve arrangement of the inner cylinder and the outer cylinder makes the volume of the ozone generator smaller. Compared with the single discharge unit, the double discharge unit used in the present invention greatly improves the ozone yield under the same power consumption, and the ozone concentration generated is 20-50% higher under the same flow rate. The whole device is compact and small in size. Under the action of the two internal and external heat dissipation channels, the device has the characteristics of low energy consumption, high concentration and large output. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of a micro ozone generator with double-surface dielectric barrier discharge.

[0031] Figure 2 This is a schematic diagram of the partial structural cross-section of a micro ozone generator with double-surface dielectric barrier discharge.

[0032] Figure 3 This is a schematic diagram of the three-dimensional structure of the ozone generating component.

[0033] In the figure, 1-first support frame; 2-ozone generating assembly; 3-heat dissipation vent; 4-first vent; 5-inner cylinder; 6-outer cylinder; 7-outer surface electrode; 8-inner surface electrode; 9-outer thread electrode; 10-inner thread electrode; 11-spacer hole; 12-second vent; 13-second support frame; 14-spacer channel; 15-second spacer groove; 16-first spacer groove; 17-heat dissipation fan; 18-partition plate; 19-protrusion. DETAILED DESCRIPTION

[0034] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention.

[0035] Example 1

[0036] like Figures 1 to 3 As shown, a double-surface dielectric barrier discharge micro ozone generator comprises an ozone generating assembly 2, wherein the ozone generating assembly 2 comprises an inner cylinder 5 and an outer cylinder 6 sleeved on the outer side of the inner cylinder 5, wherein the outer cylinder 6 and the inner cylinder 5 are both made of insulating materials, and there is a gap between the outer cylinder 6 and the inner cylinder 5, wherein the gap forms a spacing channel 14;

[0037] The inner wall surface of the inner cylinder 5 is provided with an inner surface electrode 8, and the outer wall surface of the inner cylinder 5 is sleeved with an inner thread electrode 10;

[0038] The inner wall surface of the outer cylinder 6 is provided with an external thread electrode 9, the outer wall surface of the outer cylinder 6 is provided with an external surface electrode 7, and there is a gap between the internal thread electrode 10 and the external thread electrode 9;

[0039] The inner cylinder 5 contains heat dissipation vents 3;

[0040] The inner cylinder 5 , the outer cylinder 6 , the inner surface electrode 8 , the outer surface electrode 7 , the inner thread electrode 10 and the outer thread electrode 9 are all coaxially arranged.

[0041] A partition plate 18 is disposed at one end of the spacing channel 14 . The partition plate 18 is disposed between the inner cylinder 5 and the outer cylinder 6 . A plurality of spacing holes 11 are disposed on the partition plate 18 .

[0042] The outer surface of the outer cylinder 6 is provided with two protrusions 19 , the two protrusions 19 are respectively close to the two ends of the outer cylinder 6 , and the outer surface electrode 7 is arranged between the two protrusions 19 .

[0043] An inner groove is provided on the inner surface of the inner cylinder 5 , and the inner surface electrode 8 is provided in the inner groove. The inner surface electrode 8 is provided correspondingly to the outer surface electrode 7 .

[0044] The length of the outer cylinder 6 is smaller than the length of the inner cylinder 5 .

[0045] The ozone generating assembly 2 is connected to the first support frame 1 and the second support frame 13; the two ends of the inner cylinder 5 respectively penetrate the first support frame 1 and the second support frame 13, and the heat dissipation vent 3 is connected to the air;

[0046] The first support frame 1 is provided with a first vent hole 4 and a first spacing groove 16 connected to the first vent hole 4, the first spacing groove 16 is annular, the first vent hole 4 is in communication with the air, and the first spacing groove 16 is in communication with one end of the spacing channel 14;

[0047] The second support frame 13 is provided with a second vent hole 12 and a second spacing groove 15 connected to the second vent hole 12, the second spacing groove 15 is annular, the second vent hole 12 is connected to the air, and the second spacing groove 15 is connected to an end of the spacing channel 14 away from the first spacing groove 16;

[0048] The first support frame 1 and the second support frame 13 can be designed to be rectangular, circular or other irregular shapes.

[0049] A cooling fan 17 is disposed outside the outer cylinder 6 .

[0050] The width of the spacing channel 14 is 0.1 mm to 2 mm.

[0051] The insulating material is selected from one or more of glass, quartz glass, ceramic, enamel, mica, plastic and silicone rubber;

[0052] The inner surface electrode 8 and the outer surface electrode 7 are selected from one or more of a copper electrode, an aluminum electrode, a stainless steel electrode and a gold electrode;

[0053] The internal thread electrode 10 and the external thread electrode 9 are selected from spring electrodes or sawtooth electrodes.

[0054] The inner surface electrode 8 and the outer surface electrode 7 are provided with heat sinks.

[0055] The heat dissipation vent holes 3 can be passed through for gas dissipation or water dissipation.

[0056] The schematic diagram of the three-dimensional structure of the micro ozone generator with double-surface dielectric barrier discharge according to the present invention is shown in Figure 3After the gas (air) is introduced from the second vent 12, the gas will flow through the second spacing groove 15 and be diverted through the spacing hole 11 to enter the spacing channel 14 in the ozone generating assembly. The two parts, the discharge electrode pair composed of the outer surface electrode 7 and the outer thread electrode 9 and the discharge electrode pair composed of the inner surface electrode 8 and the inner thread electrode 10, respectively perform microchannel discharge on the gas in the spacing channel 14 at the same time. The discharge intensity and area are twice that of the single dielectric barrier discharge. The gas in the spacing channel 14 is vortexed and has a higher ionization efficiency. Therefore, the ozone yield will be higher. The generated ozone passes through the second spacing groove 15 and is discharged from the first vent 4. When the ozone generating device is working, there is an airflow passing through the heat dissipation vent 3 to take away the heat generated by the inner dielectric barrier discharge. The heat dissipation fan 17 also works to continuously take away the heat generated by the outer dielectric barrier discharge.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can also make several substitutions or modifications to these described embodiments without departing from the concept of the present invention, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention.

Claims

1. A micro ozone generator with double-surface dielectric barrier discharge, characterized in that: The ozone generating assembly (2) comprises an inner cylinder (5) and an outer cylinder (6) sleeved on the outer side of the inner cylinder (5), the outer cylinder (6) and the inner cylinder (5) are both made of insulating materials, there is a gap between the outer cylinder (6) and the inner cylinder (5), and the gap forms a spacing channel (14); An inner surface electrode (8) is provided on the inner wall surface of the inner cylinder (5), and an inner thread electrode (10) is sleeved on the outer wall surface of the inner cylinder (5); An external thread electrode (9) is provided on the inner wall surface of the outer cylinder (6), an external surface electrode (7) is provided on the outer wall surface of the outer cylinder (6), and a gap is provided between the internal thread electrode (10) and the external thread electrode (9); The inner cylinder (5) has heat dissipation vent holes (3); The inner cylinder (5), the outer cylinder (6), the inner surface electrode (8), the outer surface electrode (7), the inner thread electrode (10) and the outer thread electrode (9) are all coaxially arranged; The ozone generating assembly (2) is connected to the first supporting frame (1) and the second supporting frame (13); the two ends of the inner cylinder (5) respectively pass through the first supporting frame (1) and the second supporting frame (13), and the heat dissipation vent (3) is connected to the air; The first support frame (1) is provided with a first vent hole (4) and a first spacing groove (16) connected to the first vent hole (4); the first spacing groove (16) is annular; the first vent hole (4) is in communication with air; and the first spacing groove (16) is in communication with one end of the spacing channel (14); The second support frame (13) is provided with a second vent hole (12) and a second spacing groove (15) connected to the second vent hole (12); the second spacing groove (15) is annular; the second vent hole (12) is in communication with air; and the second spacing groove (15) is in communication with an end of the spacing channel (14) away from the first spacing groove (16); A heat dissipation fan (17) is provided outside the outer cylinder (6).

2. A double-surface dielectric barrier discharge micro ozone generator according to claim 1, characterized in that: A partition plate (18) is provided at one end of the spacing channel (14). The partition plate (18) is arranged between the inner cylinder (5) and the outer cylinder (6). A plurality of spacing holes (11) are provided on the partition plate (18).

3. A micro ozone generator with double-surface dielectric barrier discharge according to claim 1, characterized in that: The outer surface of the outer cylinder (6) is provided with two protrusions (19), the two protrusions (19) are respectively close to two ends of the outer cylinder (6), and the outer surface electrode (7) is arranged between the two protrusions (19).

4. A micro ozone generator with double-surface dielectric barrier discharge according to claim 1, characterized in that: The inner surface of the inner cylinder (5) is provided with an inner groove, the inner surface electrode (8) is arranged in the inner groove, and the inner surface electrode (8) is arranged corresponding to the outer surface electrode (7).

5. The double-surface dielectric barrier discharge micro ozone generator according to claim 1, characterized in that: The length of the outer cylinder (6) is shorter than the length of the inner cylinder (5).

6. A micro ozone generator with double-surface dielectric barrier discharge according to claim 1, characterized in that: The width of the spacing channel (14) is 0.1 mm to 2 mm.

7. The double-surface dielectric barrier discharge micro ozone generator according to claim 1, characterized in that: The insulating material is selected from one or more of glass, quartz glass, ceramic, enamel, mica, plastic and silicone rubber; The inner surface electrode (8) and the outer surface electrode (7) are selected from one or more of a copper electrode, an aluminum electrode, a stainless steel electrode and a gold electrode; The internal thread electrode (10) and the external thread electrode (9) are selected from spring electrodes or sawtooth electrodes.

8. The double-surface dielectric barrier discharge micro ozone generator according to claim 1, characterized in that: The inner surface electrode (8) and the outer surface electrode (7) are provided with heat sinks.

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