CN105472856A - Low-temperature plasma generator with hexagon pipe-type structure - Google Patents

Abstract

The invention discloses a low-temperature plasma generator, which includes a copper rod, a generator cavity and a metal mesh. The generator cavity is in the shape of a regular hexagonal tube, and the material is quartz glass or corundum, which is used as a medium in the middle of the discharge gap; copper The shape of the rod is the same as that of the generator cavity, and it is arranged in the generator cavity. Both ends of the rod are sealed and fixed by positioning plugs. There are through holes for installing ventilation pipes on the positioning plugs, and the metal mesh is wrapped around the outer surface of the generator cavity. The surface is used as the negative electrode of the ground to ensure the normal discharge and fix the generator cavity; when working, the copper rod is connected to the positive electrode of the high-voltage power supply through the positive terminal, and the metal mesh is connected to the negative electrode of the high-voltage power supply through an external high-voltage wire. After power-on, the copper rod and the generator Violet low-temperature plasma is generated in the gap of the cavity, and the generation of low-temperature plasma is increased. When multiple low-temperature plasma generators are connected in parallel, the utilization rate of space can be improved, and the usage of dielectric material and negative electrode material can be saved.

Description

A Low Temperature Plasma Generator with Hexagonal Tube Structure

technical field

The present invention relates to a low-temperature plasma generator, and more particularly, relates to a generator that utilizes a hexagonal tubular structure DBD (dielectric barrier discharge) to generate low-temperature plasma.

Background technique

At present, there are basically two ways for DBD equipment to generate low-temperature plasma, one of which is flat plate electrode discharge, and the other is coaxial cylindrical electrode discharge. Ye Zhenxin and others proposed a parallel plate electrode discharge device ("Analysis of factors related to dielectric barrier discharge power", Electromechanical Technology, 2011, 34(1): 41-43), which uses 4mm ordinary glass as the discharge medium, Adjust the discharge gaps to 2mm, 2.5mm and 3mm respectively, and keep other parameters constant, and draw the conclusion that the DBD discharge power decreases with the increase of the electrode gap; When it is close to the natural resonant frequency, the conclusion that the discharge power is greater. Liu Lu et al. ("Analysis of Factors Affecting Dielectric Barrier Discharge Under Atmospheric Pressure", Insulating Materials, 2008, 41(5): 52-55) also proposed a parallel plate electrode discharge device test proof, which was deduced through experiments The following conclusions: When the dielectric constant is large and thin, when the power supply parameters and other factors remain unchanged, the discharge intensity increases with the increase of the relative dielectric constant, and decreases with the increase of the thickness of the dielectric material. Therefore, in order to obtain high-density low-temperature plasma in practice, it is necessary to reasonably adjust the discharge gap and power frequency. At the same time, the test device should use a material with a large dielectric constant and a thin thickness as the barrier layer to increase the operating voltage as much as possible. In Zhao Weidong et al. ("Simulation calculation and experimental research on the discharge power of a coaxial cylindrical DBD device", High Voltage Electrical Appliances, 2010, 46(6): 25-28) proposed a coaxial cylindrical DBD device, deriving a suitable The calculation formula of the discharge power of the DBD device with various AC voltage waveforms, the electric field and equivalent capacitance of the coaxial cylindrical structure DBD device are analyzed, and the mathematical model of the discharge power is established on this basis.

In the two flat-plate electrode discharges and coaxial cylindrical electrode discharges that use dielectric barrier discharge to generate low-temperature plasma, at present, the amount of low-temperature plasma generation is mainly increased by changing the above factors, but because only a single device is considered in the experimental conditions In practice, in order to obtain a sufficient amount of high-density low-temperature plasma, multiple cylindrical generator tubes or flat-plate generator tubes are often connected in parallel in experiments, and the cylindrical generator tubes Because there is a gap between adjacent cylinders when the tubes are connected in parallel, the space utilization rate has not reached the highest within a limited space; and when the flat-plate generator is arranged in a matrix, each positive plate must need a negative plate. , In this way, in order to generate a sufficient amount of low-temperature plasma, the demand for plate raw materials is relatively large, and at the same time, the amount of dielectric layer materials used will also increase.

Contents of the invention

The problem to be solved by the present invention is to overcome the defects of space utilization when multiple generators are used in parallel in the prior art and the defects of the usage of negative electrode materials and dielectric materials, and provide a low-temperature plasma with a hexagonal tubular structure The generator can be seamlessly joined to obtain higher space utilization and less anode material usage.

A low-temperature plasma generator provided by the present invention is characterized in that it includes a copper rod, a generator cavity and a metal mesh, the generator cavity is a regular hexagonal tube, and the material is quartz glass or corundum. The medium in the middle of the gap; the copper rod has the same shape as the generator cavity, and is arranged in the generator cavity. Wrapped on the outer surface of the generator cavity, it is used as the ground negative electrode to ensure the normal discharge, and at the same time play a role in fixing the generator cavity;

When working, the copper rod is connected to the positive pole of the high-voltage power supply through the positive terminal, and the metal mesh is connected to the negative pole of the high-voltage power supply through an external high-voltage wire. Production is increased.

According to the present invention, when multiple low-temperature plasma generators with hexagonal tubular structures are connected in parallel, since the outer surfaces of the generator tubes are all set as negative poles, the outer surfaces can be tightly bonded, and the airflow passing through the entire generator part can avoid the airflow from Loss between adjacent generator tubes, thus improving space utilization. At the same time, because the regular hexagonal structure can be closely and seamlessly arranged, under the same area, the regular hexagonal perimeter is the smallest, so the regular hexagonal structure uses the least material, thereby saving the use of dielectric materials and negative electrode materials.

Description of drawings

Fig. 1 is the structural representation of the low temperature plasma generator of hexagonal tubular structure of the present invention;

Fig. 2 is a working flow chart of the low temperature plasma generator with hexagonal tubular structure of the present invention.

detailed description

The invention can be used to remove harmful inorganic (NO _x , SO _x ) and organic gases (VOCs) in the air through chemical or physical action with low-temperature plasma. The invention proves through experiments that the single low-temperature plasma generator with hexagonal tubular structure can achieve above 99% removal rate of the above gases.

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. Advantageous features of the present invention will be apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use very precise ratios, and are only used for the purpose of clearly and conveniently assisting in describing the embodiments of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

As shown in FIG. 1 , the low-temperature plasma generator provided by the example of the present invention includes a vent pipe 1 , a positive terminal post 2 , a positioning plug 3 , a copper rod 4 , a generator cavity 5 and a metal mesh 6 . The generator cavity 5 is in the shape of a regular hexagonal tube, and the material can be quartz glass and corundum. As the medium in the middle of the discharge gap, quartz glass is preferred, and its dielectric constant is 3.7, which can ensure that the discharge is carried out smoothly at a lower voltage. , making it a hexagonal shape can save a lot of space when connecting multiple generators together. The copper rod 4 is the same as the generator cavity 5, and the copper rod 4 is located in the generator cavity 5, and is fixed by the positioning plug 3, and ensures the sealing in the cavity, and the copper rod 4 is connected to the positive pole of the power supply through the positive pole terminal 2. The copper rod 4 has the same shape as the generator cavity 5 to ensure uniform discharge, and the gap between the copper rod 4 and the quartz glass tube is 1-2 mm to ensure that no discharge breakdown occurs. The metal mesh 6 is a fine mesh made of stainless steel, copper or silver. The metal mesh 6 is tightly wrapped on the surface of the generator cavity 5 to ensure the normal discharge and to fix the quartz glass tube. As shown in Figure 2, when the low-temperature plasma generator with hexagonal tubular structure of the example of the present invention is in operation, the copper rod 4 is connected to the positive pole of the high-voltage power supply through the positive terminal 2, and the metal mesh 6 is connected to the negative pole of the high-voltage power supply through an external high-voltage electric wire 7. After turning on the power, it can be clearly seen that a purple low-temperature plasma is generated between the copper rod and the dielectric quartz glass tube. According to the experiment, the circular tubular structure can generate more low-temperature plasma under the condition of voltage 12KV and frequency 8KHZ, but this generator can generate a large amount of low-temperature plasma under the condition of voltage 8.1KV and frequency 8KHZ, so The generator adopts a hexagonal tubular structure instead of the traditional circular tubular structure, which can not only save a lot of space, improve the space utilization rate, but also improve the efficiency of low-temperature plasma generation and reduce the power required for low-temperature plasma generation. Voltage size.

The low-temperature plasma generator with hexagonal tubular structure of the present invention has very broad application prospects in some devices that utilize low-temperature plasma work, such as using the generator in low-temperature plasma purifiers and low-temperature plasma sterilizers , can save a lot of space, and can also improve the efficiency of dust removal and sterilization.

Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (5)

1. a low-temperature plasma generator, it is characterized in that, it comprises copper rod (4), generator cavity (5) and wire netting (6), described generator cavity (5) is regular hexagon tubulose, material is quartz glass or corundum, as the medium in the middle of discharging gap; Copper rod (4) is identical with generator cavity (5) shape, be arranged in described generator cavity, its two ends are all fixing by limit plug (3) sealing, limit plug (3) all has the through hole for installing breather pipe (1), wire netting (6) is wrapped in the outer surface of generator cavity (5), as ground connection negative pole, to ensure that electric discharge is normally carried out, play the effect of fixing generator cavity (5) simultaneously;

During work, copper rod (4) connects high-voltage power cathode by positive terminal head (2), wire netting (6) connects high voltage source negative pole by external high-tension bus-bar (7), purpuric low temperature plasma between the gap of the rear copper rod (4) of energising and generator cavity (5), and the generation of low temperature plasma is increased.

2. a kind of low-temperature plasma generator according to claim 1, is characterized in that, the fine-structure mesh that described wire netting (6) is stainless steel, copper or ag material are made.

3. a kind of low-temperature plasma generator according to claim 1, is characterized in that, described rear copper rod (4) is 1mm-2mm with the spacing of generator cavity (5), to ensure the situation not occurring discharge breakdown.

4. a kind of low-temperature plasma generator according to claim 1, is characterized in that, described limit plug (3) is detachable installing structure.

5. according to described a kind of low-temperature plasma generator arbitrary in Claims 1-4, it is characterized in that, be made up of multiple described low-temperature plasma generator parallel connection, be wrapped in the wire netting (6) of the outer surface of generator cavity (5) as ground connection negative pole, air-flow is lost to avoid air-flow by whole generator part between adjacent generator tube, to improve space availability ratio, the generator cavity (5) of regular hexagon structure can arrange, to save dielectric material and negative material use amount by closed seamless.