CN111629506A - Large-area space uniform plasma generator and generation method - Google Patents
Large-area space uniform plasma generator and generation method Download PDFInfo
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- CN111629506A CN111629506A CN202010433075.4A CN202010433075A CN111629506A CN 111629506 A CN111629506 A CN 111629506A CN 202010433075 A CN202010433075 A CN 202010433075A CN 111629506 A CN111629506 A CN 111629506A
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Abstract
A plasma generator with uniform large area and space is disclosed, which comprises a high-voltage power supply, a positive electrode wire and a negative electrode wire. The positive lead and the negative lead are both in a grid structure, the grid structures of the positive lead and the negative lead are mutually crossed, the whole body forms a mesh structure with crossed warps and wefts, and the crossed points are required to be uniformly distributed. When the high-voltage power supply outputs high voltage, a high field intensity area is formed near a grid intersection formed by the positive electrode lead and the negative electrode lead; under the action of electric field force, partial molecules in the air are ionized to generate plasma; because a large number of cross points of the positive and negative leads exist in the whole plasma generator, and each cross point generates plasma, the plasma which is uniformly distributed in the whole electrode plane can be generated. The invention is used for solving the defects of low plasma generation efficiency, small treatment area and uneven treatment effect space in industrial application in the specific fields of sterilization, disinfection, material modification, sewage and wastewater treatment and the like.
Description
Technical Field
The invention relates to the field of plasma generators, in particular to a large-area space uniform plasma generator and a generating method.
Background
The plasma is a substance fourth state different from solid, liquid and gas, is composed of ions, electrons and various active particles, and has wide application in the fields of sewage and wastewater treatment, sterilization, material modification and aerospace. In order to generate plasma at normal temperature and pressure, air molecules must be ionized by a strong electric field. This ionization device is a plasma generator. According to different structures of the discharge electrode, the structural configuration of a typical plasma generator comprises dielectric barrier discharge of a strip electrode to a flat plate, corona discharge of the electrode to the flat plate, arc discharge of two high-temperature resistant cylindrical electrodes and the like. The plasma generated in the above manner is concentrated on the tip or edge of the electrode, and it is difficult to achieve a spatially uniform distribution. This limits to some extent the processing area and processing efficiency of the plasma in industrial applications. In addition, since the discharge is very concentrated in space, the plasma region generates heat seriously, and the aging speed of the electrode and the insulating material is fast.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a large-area space uniform plasma generator, which comprises a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The positive electrode wires are planar wires and comprise a plurality of wires which are arranged in parallel along the vertical direction and one or two wires which are arranged in parallel along the horizontal direction, the distances between the adjacent wires in the vertical direction are equal, the lengths of the wires are also equal, and the upper ends and the lower ends of the wires are respectively flush to form a grid structure; one horizontal direction lead is connected with the upper ends of all vertical direction leads, and/or the other horizontal direction lead is connected with the lower ends of all vertical direction leads, and the positive lead is connected with the positive pole of the high-voltage power supply;
the cathode lead is a planar lead and comprises a plurality of leads which are arranged in parallel along the horizontal direction and one or two leads which are arranged in parallel along the vertical direction, the intervals between the adjacent leads in the horizontal direction are equal, the lengths of the leads in the horizontal direction are also equal, and the left end and the right end of the leads are respectively flush to form a grid structure; one vertical direction lead is connected with the left ends of all horizontal direction leads, and/or the other vertical direction lead is connected with the right ends of all horizontal direction leads, and the negative pole lead is connected with the negative pole of the high-voltage power supply;
the grid structures of the positive lead and the negative lead are staggered and attached together and are intersected with each other, a mesh structure with intersected longitude and latitude is integrally formed, and all intersections of the positive lead and the negative lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
The invention also provides a large-area space uniform plasma generator, which comprises a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The positive electrode lead is a planar lead and comprises a reticular structure consisting of a plurality of leads arranged in parallel along the vertical direction and a plurality of leads arranged in parallel along the horizontal direction, each grid of the reticular structure is a square with equal size, and the positive electrode lead is connected with the positive electrode of the high-voltage power supply;
the negative electrode lead is a plane lead and comprises a plurality of leads which are arranged in parallel along the vertical direction and a reticular structure which is formed by a plurality of leads which are arranged in parallel along the horizontal direction, each grid structure of the reticular structure is a square with the same size as the grid of the positive electrode lead, and the negative electrode lead is connected with the negative electrode of the high-voltage power supply;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
In one embodiment of the invention, the positive wire is a planar wire and comprises a net structure formed by rhombic grids, each rhombic grid is equal in size, and the positive wire is connected with the positive electrode of the high-voltage power supply;
the negative wire is a planar wire and comprises a net structure formed by rhombic grids, each rhombic grid has the same size as the rhombic grid of the positive wire, and the negative wire is connected with the negative electrode of the high-voltage power supply;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed; therefore, each side of the grid of the positive electrode lead and each side of the grid of the negative electrode lead are respectively parallel to each other;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
The invention also provides a large-area space uniform plasma generator, which comprises a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The grid wires are planar wires and comprise a plurality of wires which are arranged in parallel along the vertical direction and one or two wires which are arranged in parallel along the horizontal direction, the distances between the adjacent wires in the vertical direction are equal, the lengths of the wires are also equal, and the upper ends and the lower ends of the wires are respectively flush to form a grid structure; one horizontal direction conducting wire is connected with the upper ends of all the vertical direction conducting wires, and/or the other horizontal direction conducting wire is connected with the lower ends of all the vertical direction conducting wires;
the reticular wires are planar wires and comprise a reticular structure formed by a plurality of wires which are arranged in parallel along the vertical direction and a plurality of wires which are arranged in parallel along the horizontal direction, and each grid of the reticular structure is a square with equal size;
one of the grid lead and the reticular lead is connected with the positive pole of the high-voltage power supply to form a positive lead; the other is connected with the negative electrode of the high-voltage power supply to form a negative electrode lead;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
In addition, also provides a large-area space uniform plasma generator, which comprises a high-voltage power supply, a positive electrode lead and a negative electrode lead; the positive electrode lead and the negative electrode lead are both planar, and the shapes of the positive electrode lead and the negative electrode lead ensure that all cross points of the positive electrode lead and the negative electrode lead are uniformly distributed, so that the space uniformity generated by the plasma is regulated and controlled.
In an embodiment of the invention, the large-area space uniform plasma generator, the positive electrode lead and the negative electrode lead use a flexible lead mesh structure, which can adapt to the appearance of a complex model.
In addition, by utilizing the large-area space uniform plasma generator, the invention provides a large-area space uniform plasma generating method, which comprises the following specific processes: when the high-voltage power supply outputs high voltage, a high field intensity area is formed near a grid intersection formed by the positive electrode lead and the negative electrode lead; under the action of electric field force, partial molecules in the air are ionized to generate plasma; because a large number of cross points of the positive and negative leads exist in the whole plasma generator, and each cross point generates plasma, the plasma which is uniformly distributed in the whole electrode plane can be generated.
The large-area space uniform plasma generator is used for sterilization, disinfection, sewage treatment and material modification.
The invention provides a plasma generator with large area and uniform space and a corresponding plasma generating method, which solve the defects of low plasma generating efficiency, small processing area and non-uniform processing effect space in industrial application in the specific fields of sterilization, material modification, sewage and wastewater treatment and the like. In addition, compared with a generation mode of local high-density plasma in traditional industrial application, the plasma generation device can reduce the ablation and aging rates of insulating materials and electrode materials, prolong the service life of the plasma generation device and reduce the operation and maintenance cost of the plasma device.
Drawings
FIG. 1 shows a plasma generator in the form of a cross-bar electrode;
fig. 2 shows the basic structure of a high voltage resistant cable;
FIG. 3 shows a plasma generator in the form of a dislocated mesh electrode;
FIG. 4 illustrates an implementation of a positive lead plus a mesh negative lead in parallel;
figure 5 shows a typical waveform for a high voltage power supply in a generator.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
As shown in fig. 1, the first embodiment of the plasma generator with a large area and a uniform space of the present invention is mainly composed of a high voltage power supply, a positive electrode lead and a negative electrode lead, wherein the positive electrode lead and the negative electrode lead are both planar leads. The positive lead comprises a plurality of leads arranged in parallel along the vertical direction and two leads arranged in parallel along the horizontal direction, the space between adjacent leads in the vertical direction is equal, the lengths of the leads are also equal, and the upper end and the lower end of each lead are respectively flush to form a grid structure; one horizontal direction lead is connected with the upper ends of all vertical direction leads, the other horizontal direction lead is connected with the lower ends of all vertical direction leads, and the positive lead is connected with the positive pole of the high-voltage power supply. The negative electrode lead comprises a plurality of leads which are arranged in parallel along the horizontal direction and two leads which are arranged in parallel along the vertical direction, the distance between the adjacent leads in the horizontal direction is equal, the lengths of the plurality of leads in the horizontal direction are also equal, and the left end and the right end of the leads are respectively flush to form a grid structure; one vertical direction lead is connected with the left ends of all horizontal direction leads, the other vertical direction lead is connected with the right ends of all horizontal direction leads, and the negative pole lead is connected with the negative pole of the high-voltage power supply. The grid structures of the positive lead and the negative lead are staggered and attached together and are intersected with each other to form a mesh structure with intersected longitude and latitude as a whole, and all the intersections of the positive lead and the negative lead are ensured to be uniformly distributed. At least one of the positive and negative leads is a high voltage resistant cable as shown in fig. 2, i.e. a layer of high voltage resistant insulating material is wrapped outside the metal conductive core to prevent the high voltage breakdown at the crossing position of the positive and negative leads.
In order to further increase the number of the crossing points of the positive electrode and the negative electrode, a second embodiment of the large-area space uniform plasma generator shown in fig. 3 can be adopted, specifically: the positive and negative wires are respectively woven into a net shape (i.e. a grid shape similar to a window screen, the grid shape can be a square or a rectangle with equal size), and then the two nets are staggered and attached together, so that all the cross points of the positive wire and the negative wire are uniformly distributed.
Of course, a third embodiment of a large area spatially uniform plasma generator according to the present invention as shown in fig. 4 can also be used, and in particular fig. 4 belongs to the hybrid configuration of fig. 2 and 3, namely: one of the positive and negative leads adopts a net structure, while the other one still adopts a parallel structure. It is necessary to ensure that all the intersections of the positive and negative leads are uniformly distributed.
In addition to the electrode layout schemes shown in fig. 1, 3, and 4, in other embodiments of the present invention, a diamond grid scheme or a honeycomb grid scheme may be used, or other schemes that achieve "uniform distribution of cross points" may be achieved. The core of the invention is to regulate and control the space uniformity of plasma generation by arranging a large number of evenly distributed anode and cathode cross points in a plane.
According to specific needs, the plasma generator can use a flexible wire mesh structure and can be attached to the outer surface of a complex model to carry out contact type material modification treatment. The plasma layer generated can be blown to the part needing to be treated, such as sewage needing to be treated or the part needing to be disinfected and sterilized, by utilizing an external fan, so that the application is wider.
Based on the large-area space uniform plasma generator, the invention also provides a large-area space uniform plasma generating method, which comprises the following steps: when the high-voltage power supply outputs high voltage, a high field intensity area is formed near the grid intersection formed by the positive electrode lead and the negative electrode lead. Under the action of electric field force, partial molecules in the air are ionized to generate plasma. Compared with the existing plasma generator, the plasma generator can generate plasmas uniformly distributed in the whole electrode plane. The plasma layer with large area and even distribution can be used for sterilization, sewage treatment, material modification and the like.
The main function of the high-voltage power supply is to generate a strong electric field between the positive electrode and the negative electrode, the voltage waveform can be sinusoidal, pulse or other types, and fig. 5 shows the sinusoidal waveform and the sharp pulse waveform output by the high-voltage power supply generator.
The invention has the advantages that:
1. a large number of evenly distributed positive and negative cross points are arranged, so that the area generated by the plasma is larger, the uniformity is very high, and the sewage treatment and disinfection rate in industrial application can be improved;
2. the problems of heating, electrode material aging and the like caused by the fact that plasmas are generated locally in a concentrated mode in the conventional generator can be solved, and the service life of the plasma generating device is greatly prolonged;
3. the positive electrode and the negative electrode adopt high-voltage cables with low manufacturing cost, so that expensive insulating materials (such as ceramic plates, polyimide and the like) are avoided;
4. the plasma generator can use a flexible wire mesh structure and can be attached to the surface of a complex model to carry out contact type material modification treatment. The plasma layer generated can be blown to the part needing to be treated, such as sewage needing to be treated or the part needing to be disinfected and sterilized, by utilizing an external fan, so that the application is wider.
Claims (10)
1. A large-area space uniform plasma generator is characterized by comprising a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The positive electrode wires are planar wires and comprise a plurality of wires which are arranged in parallel along the vertical direction and one or two wires which are arranged in parallel along the horizontal direction, the distances between the adjacent wires in the vertical direction are equal, the lengths of the wires are also equal, and the upper ends and the lower ends of the wires are respectively flush to form a grid structure; one horizontal direction lead is connected with the upper ends of all vertical direction leads, and/or the other horizontal direction lead is connected with the lower ends of all vertical direction leads, and the positive lead is connected with the positive pole of the high-voltage power supply;
the cathode lead is a planar lead and comprises a plurality of leads which are arranged in parallel along the horizontal direction and one or two leads which are arranged in parallel along the vertical direction, the intervals between the adjacent leads in the horizontal direction are equal, the lengths of the leads in the horizontal direction are also equal, and the left end and the right end of the leads are respectively flush to form a grid structure; one vertical direction lead is connected with the left ends of all horizontal direction leads, and/or the other vertical direction lead is connected with the right ends of all horizontal direction leads, and the negative pole lead is connected with the negative pole of the high-voltage power supply;
the grid structures of the positive lead and the negative lead are staggered and attached together and are intersected with each other, a mesh structure with intersected longitude and latitude is integrally formed, and all intersections of the positive lead and the negative lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
2. A large-area space uniform plasma generator is characterized by comprising a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The positive electrode lead is a planar lead and comprises a reticular structure consisting of a plurality of leads arranged in parallel along the vertical direction and a plurality of leads arranged in parallel along the horizontal direction, each grid of the reticular structure is a square with equal size, and the positive electrode lead is connected with the positive electrode of the high-voltage power supply;
the negative electrode lead is a plane lead and comprises a plurality of leads which are arranged in parallel along the vertical direction and a reticular structure which is formed by a plurality of leads which are arranged in parallel along the horizontal direction, each grid structure of the reticular structure is a square with the same size as the grid of the positive electrode lead, and the negative electrode lead is connected with the negative electrode of the high-voltage power supply;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
3. A large area spatially uniform plasma generator as claimed in claim 2 wherein the positive conductor is a planar conductor comprising a mesh structure of diamond shaped grids, each diamond shaped grid being of equal size, the positive conductor being connected to the positive electrode of the high voltage power supply;
the negative wire is a planar wire and comprises a net structure formed by rhombic grids, each rhombic grid has the same size as the rhombic grid of the positive wire, and the negative wire is connected with the negative electrode of the high-voltage power supply;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed; therefore, each side of the grid of the positive electrode lead and each side of the grid of the negative electrode lead are respectively parallel to each other;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
4. A large-area space uniform plasma generator is characterized by comprising a high-voltage power supply, a positive electrode lead and a negative electrode lead; wherein
The grid wires are planar wires and comprise a plurality of wires which are arranged in parallel along the vertical direction and one or two wires which are arranged in parallel along the horizontal direction, the distances between the adjacent wires in the vertical direction are equal, the lengths of the wires are also equal, and the upper ends and the lower ends of the wires are respectively flush to form a grid structure; one horizontal direction conducting wire is connected with the upper ends of all the vertical direction conducting wires, and/or the other horizontal direction conducting wire is connected with the lower ends of all the vertical direction conducting wires;
the reticular wires are planar wires and comprise a reticular structure formed by a plurality of wires which are arranged in parallel along the vertical direction and a plurality of wires which are arranged in parallel along the horizontal direction, and each grid of the reticular structure is a square with equal size;
one of the grid lead and the reticular lead is connected with the positive pole of the high-voltage power supply to form a positive lead; the other is connected with the negative electrode of the high-voltage power supply to form a negative electrode lead;
the positive electrode lead and the negative electrode lead are bonded together in a staggered manner, and all cross points of the positive electrode lead and the negative electrode lead are ensured to be uniformly distributed;
at least one of the positive and negative leads is a high-voltage-resistant cable, and the high-voltage-resistant cable is formed by wrapping a layer of high-voltage-resistant insulating material outside a metal conductive core to prevent the crossing position of the positive and negative leads from being broken down by high voltage.
5. A large-area space uniform plasma generator is characterized by comprising a high-voltage power supply, a positive electrode lead and a negative electrode lead; the positive electrode lead and the negative electrode lead are both planar, and the shapes of the positive electrode lead and the negative electrode lead ensure that all cross points of the positive electrode lead and the negative electrode lead are uniformly distributed, so that the space uniformity generated by the plasma is regulated and controlled.
6. A large area spatially uniform plasma generator as in any of claims 1 to 5 wherein the positive and negative leads are flexible wire mesh structures that can accommodate complex model appearances.
7. A method for generating a large area spatially uniform plasma provided by using the large area spatially uniform plasma generator as claimed in any one of claims 1 to 6, wherein the specific process is as follows: when the high-voltage power supply outputs high voltage, a high field intensity area is formed near a grid intersection formed by the positive electrode lead and the negative electrode lead; under the action of electric field force, partial molecules in the air are ionized to generate plasma; because a large number of cross points of the positive and negative leads exist in the whole plasma generator, and each cross point generates plasma, the plasma which is uniformly distributed in the whole electrode plane can be generated.
8. A method for generating a large area spatially uniform plasma provided by the large area spatially uniform plasma generator of claim 7, wherein the specific process is as follows: when the high-voltage power supply outputs high voltage, a high field intensity area is formed near a grid intersection formed by the positive electrode lead and the negative electrode lead; under the action of electric field force, partial molecules in the air are ionized to generate plasma; because a large number of cross points of the positive and negative leads exist in the whole plasma generator, and each cross point generates plasma, the plasma which is uniformly distributed in the whole electrode plane can be generated.
9. The large area spatially uniform plasma generator of any of claims 1 to 6 for use in sterilization, sewage treatment, material modification.
10. The large area spatially uniform plasma generator of claim 7 for sterilization, sewage treatment, material modification.
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| CN113048046A (en) * | 2021-03-09 | 2021-06-29 | 杭州未名信科科技有限公司 | Microelectrode and electroosmosis pump |
| CN113225888A (en) * | 2021-05-28 | 2021-08-06 | 南京苏曼等离子工程研究院有限公司 | Low-temperature plasma airflow generator |
| CN113630948A (en) * | 2021-08-16 | 2021-11-09 | 西安交通大学 | Grid array type uniform plasma device |
| CN113747647A (en) * | 2021-08-16 | 2021-12-03 | 西安交通大学 | Double-grid-surface type uniform plasma generator and preparation method thereof |
| CN114040557A (en) * | 2021-11-04 | 2022-02-11 | 中船重工安谱（湖北）仪器有限公司 | Array type dielectric barrier glow discharge device |
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Application publication date: 20200904 |