阅读说明：本技术 一种多用等离子体自持激发电极 (Multipurpose plasma self-sustaining exciting electrode ) 是由 郭啸龙 刘云龙 于 2021-08-06 设计创作，主要内容包括：本发明涉及一种多用等离子体自持激发电极,包括绝缘支座、高压电极模块、调节环、低压电极,绝缘支座内设置开口朝上的高压腔,高压电极模块朝上的安装于高压腔内,绝缘支座靠上部设置圆柱形的前端外壁,圆环形的调节环和圆环形的低压电极紧密套装在前端外壁上,用于调节低压电极上下位置的调节环位于低压电极的下端,绝缘支座采用绝缘材料,高压电极模块和低压电极采用导电材料。本电极可以在大气环境中形成均匀稳定弥散的低温等离子体,通过调节环和螺杆的作用,产出不同强度、不同稳定性、不同形状的等离子体,便于多场合使用。(The invention relates to a multipurpose plasma self-sustaining excitation electrode, which comprises an insulating support, a high-voltage electrode module, an adjusting ring and a low-voltage electrode, wherein a high-voltage cavity with an upward opening is arranged in the insulating support, the high-voltage electrode module is upwards arranged in the high-voltage cavity, the cylindrical front end outer wall is arranged at the upper part of the insulating support, the annular adjusting ring and the annular low-voltage electrode are tightly sleeved on the front end outer wall, the adjusting ring for adjusting the upper and lower positions of the low-voltage electrode is positioned at the lower end of the low-voltage electrode, the insulating support is made of insulating materials, and the high-voltage electrode module and the low-voltage electrode are made of conductive materials. The electrode can form uniform and stable dispersed low-temperature plasma in the atmospheric environment, and the plasma with different strengths, different stabilities and different shapes can be produced under the action of the adjusting ring and the screw rod, so that the electrode is convenient to use in multiple occasions.)

1. A multi-purpose plasma self-sustaining exciting electrode is characterized by comprising an insulating support (1), a high-voltage electrode module, an adjusting ring (4) and a low-voltage electrode (5), wherein a high-voltage cavity (14) with an upward opening is arranged in the insulating support (1), the high-voltage electrode module is arranged in the high-voltage cavity (14), and a cylindrical front end outer wall (12) is arranged at the upper part of the insulating support (1); the annular adjusting ring (4) and the annular low-voltage electrode (5) are tightly sleeved on the outer wall (12) at the front end, and the adjusting ring (4) for adjusting the upper and lower positions of the low-voltage electrode (5) is positioned at the lower end of the low-voltage electrode (5); the insulating support (1) is made of insulating materials, and the high-voltage electrode module and the low-voltage electrode (5) are made of conducting materials.

2. The multi-purpose plasma self-sustaining ignition electrode according to claim 1, wherein the lower end of the front outer wall (12) is provided with a step shaft (11), the outer wall of the step shaft (11) is provided with an external thread, and the adjusting ring (4) is installed on the step shaft (11) in a threaded manner.

3. The multi-purpose plasma self-sustaining ignition electrode according to claim 1, wherein the high voltage electrode module comprises a high voltage needle base (2) and a high voltage needle electrode (3), the high voltage needle base (2) is installed in the high voltage cavity (14), and the high voltage needle electrode (3) is fixed on the high voltage needle base (2) in an upward direction.

4. A multi-purpose plasma self-sustaining ignition electrode according to claim 3, wherein said high voltage needle base (2) is provided with a plurality of needle holes (21) uniformly arranged on its upper end surface in a circumferential array, and the high voltage needle electrode (3) is fastened into each of said needle holes (21).

5. The multi-purpose plasma self-sustaining excitation electrode according to claim 3, characterized in that, the multi-purpose plasma self-sustaining excitation electrode further comprises a screw rod for adjusting the up-down position of the high-voltage needle base (2), the bottom of the insulating support (1) is provided with a central hole (15), the central hole (15) penetrates through the bottom of the insulating support (1) and the high-voltage cavity (14), the center of the bottom end of the high-voltage needle base (2) is provided with a threaded hole (22), and the screw rod penetrates through the central hole (15) to be matched with the threaded hole (22).

6. The multi-purpose plasma self-sustaining ignition electrode according to claim 5, wherein the high pressure needle base (2) is provided with a central groove (23) with an upward opening at the top center.

7. The multipurpose plasma self-sustaining exciting electrode according to claim 1, wherein the low voltage electrode (5) is a triangular conical ring structure, and when the low voltage electrode (5) is installed on the front end outer wall (12), the upward end of the low voltage electrode (5) is set to be sharp.

8. The multi-purpose plasma self-sustaining ignition electrode according to claim 1, wherein the ratio of the in-plane electrical distance L1+ L2 to the wall thickness L3 of the high pressure chamber (14) is in the range of 3 or less.

9. A multi-purpose plasma self-sustaining excitation electrode system is characterized by comprising a plasma high-voltage excitation power supply and the multi-purpose plasma self-sustaining excitation electrode as claimed in any one of claims 1 to 8, wherein the low-voltage electrode (5) is electrically connected with the low-voltage end of the plasma high-voltage excitation power supply, the low-voltage electrode (5) is grounded, and a high-voltage electrode module of the electrode is electrically connected with the high-voltage end of the plasma high-voltage excitation power supply.

10. A multi-purpose plasma self-sustaining exciting electrode system is characterized by comprising a plasma high-voltage exciting power supply, an external conductor (9) and the multi-purpose plasma self-sustaining exciting electrode as claimed in any one of claims 1 to 8, wherein the low-voltage electrode (5) is electrically connected with the low-voltage end of the plasma high-voltage exciting power supply, and the low-voltage electrode (5) is grounded; the external conductor (9) is electrically connected with the low-voltage end of the plasma high-voltage excitation power supply and is grounded; the high-voltage electrode module of the electrode is electrically connected with the high-voltage end of the plasma high-voltage excitation power supply.

Technical Field

The invention relates to the technical field of electrician and electricity, in particular to a multipurpose plasma self-sustaining excitation electrode.

Background

The application of plasma technology in industrial and civil fields is increasing, but the generation of plasma often needs a complex structure, a high-voltage and high-power supply, and often also needs special gas or adjustable gas pressure, and the generation conditions limit the further application of the plasma. How to obtain stable, uniformly dispersed and low-temperature plasma in atmospheric environment is always the key point of domestic and foreign research, the plasma generated in atmospheric environment can basically meet the application requirements of all aspects, and the low-temperature uniformity and stability has great application prospects in civil fields, such as ozone manufacture, air purification, medical cosmetology, appreciation, surface treatment and the like. However, since the discharge in the atmospheric air is easily converted from the Thompson discharge into the streamer discharge, the contraction characteristic of the streamer discharge determines that the electrode discharge is easily caused to break down, and a bright spark wire is formed. How to generate stable, uniform and dispersed plasma in the atmospheric environment is a problem which needs to be solved urgently at present.

Disclosure of Invention

Based on the above description, the invention provides a multi-purpose plasma self-sustaining excitation electrode to solve the problem that the common equipment cannot obtain stable and uniformly dispersed low-temperature plasma in the atmospheric environment.

The technical scheme for solving the technical problems is as follows:

the utility model provides a multi-purpose plasma self-sustained excitation electrode, including insulating support, high voltage electrode module, the adjustable ring, the low pressure electrode, set up opening high pressure chamber up in the insulating support, high voltage electrode module installs in high pressure intracavity, the insulating support leans on upper portion to set up columniform front end outer wall, the inseparable suit of annular adjustable ring and the annular low pressure electrode of circle is on the front end outer wall, a lower extreme that the adjustable ring that is used for adjusting low pressure electrode upper and lower position is located the low pressure electrode, insulating support adopts insulating material, high voltage electrode module and low pressure electrode adopt conducting material. The electrode of the scheme can generate uniform and stable plasma in the atmospheric environment. The strength, stability and shape of the generated plasma can be changed by adjusting the position of the low-voltage electrode through the adjusting ring

Preferably, the lower extreme of front end outer wall set up the step axle, step axle outer wall sets up the external screw thread, the adjustable ring is installed on the step axle with threaded connection's mode. The adjusting ring is arranged on the step shaft in a threaded connection mode, so that the upper position and the lower position of the low-voltage electrode can be adjusted conveniently.

Preferably, the high-voltage electrode module comprises a high-voltage needle base and a high-voltage needle electrode, the high-voltage needle base is installed in the high-voltage cavity, and the high-voltage needle electrode faces upwards and is fixed on the high-voltage needle base. Through dividing into high-voltage needle base and high-voltage needle electrode equipment design with high-voltage electrode module, be convenient for preparation and installation, be convenient for the selection of material simultaneously.

Preferably, a plurality of needle holes are uniformly arranged on the upper end surface of the high-voltage needle base in a circumferential array mode, and the high-voltage needle electrode is fastened in each needle hole. The high-voltage needle base is provided with a plurality of needle holes uniformly and densely distributed on the upper end surface for inserting the high-voltage needle electrodes, so that a uniform electric field can be formed, and uniform plasma can be generated.

Preferably, the multi-purpose plasma self-sustaining excitation electrode further comprises a screw rod used for adjusting the upper position and the lower position of the high-voltage needle base, the bottom of the insulating support is provided with a central hole, the central hole penetrates through the bottom of the insulating support and the high-voltage cavity, the central position of the bottom end of the high-voltage needle base is provided with a threaded hole, and the screw rod penetrates through the central hole to be matched with the threaded hole. The screw rod which can be screwed is arranged at the bottom of the high-pressure needle base, so that the upper and lower positions of the high-pressure needle base can be conveniently adjusted.

Preferably, a central groove with an upward opening is arranged at the center of the top of the high-pressure needle base. The central groove is formed in the top of the high-pressure needle base, so that the high-pressure needle base can be conveniently adjusted to be in the vertical position by matching with the screw.

Preferably, the low-voltage electrode is of a triangular conical ring structure, and when the low-voltage electrode is installed on the outer wall of the front end, the upward end of the low-voltage electrode is set to be a sharp angle. The tip of the low-voltage electrode faces upwards, so that a high-voltage electric field between the low-voltage electrode and the high-voltage electrode module is convenient for exciting plasma.

Preferably, the ratio of the in-plane electrical distance L1+ L2 to the wall thickness L3 of the high-pressure chamber 14 ranges from 3 or less. By designing the ratio of L1+ L2 to L3 within 3, the plasma high voltage excitation power is lower while the plasma is excited, and high voltage breakdown of the insulating support is avoided.

A multi-purpose plasma self-sustaining exciting electrode system comprises a plasma high-voltage exciting power supply and a multi-purpose plasma self-sustaining exciting electrode as claimed in any one of claims 1-8, wherein the low-voltage electrode is electrically connected with the low-voltage end of the plasma high-voltage exciting power supply, the low-voltage electrode is grounded, and a high-voltage electrode module of the electrode is electrically connected with the high-voltage end of the plasma high-voltage exciting power supply.

A multi-purpose plasma self-sustaining exciting electrode system comprises a plasma high-voltage exciting power supply, an external conductor and the multi-purpose plasma self-sustaining exciting electrode as claimed in any one of claims 1 to 8, wherein the low-voltage electrode is electrically connected with the low-voltage end of the plasma high-voltage exciting power supply and is grounded; the external conductor is electrically connected with the low-voltage end of the plasma high-voltage excitation power supply and is grounded; the high-voltage electrode module of the electrode is electrically connected with the high-voltage end of the plasma high-voltage excitation power supply.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the invention relates to a multipurpose plasma self-sustaining excitation electrode, which can form uniform and stable dispersed low-temperature plasma in an atmospheric environment, and can produce plasmas with different strengths, different stabilities and different shapes through the action of an adjusting ring and a screw rod, thereby being convenient for use in multiple occasions. A high-voltage electric field along the surface is formed by a cylindrical insulating support, a sharp high-voltage needle electrode array and a triangular conical low-voltage electrode, so that plasma is excited in the atmospheric environment.

Drawings

FIG. 1 is a perspective view of the electrode structure of the present invention;

FIG. 2 is an exploded view of the electrode of the present invention;

FIG. 3 is an over-axis cross-sectional view of an electrode of the present invention;

FIG. 4 is an over-axis cross-sectional view of the insulator support of the present invention;

FIG. 5 is a perspective view of the high pressure needle base of the present invention;

FIG. 6 is an over-axis cross-sectional view of the high pressure needle base of the present invention;

FIG. 7 is an over-axis cross-sectional view of the low voltage electrode of the present invention;

FIG. 8 is a schematic size view of an insulating support of the present invention;

FIG. 9 is a schematic diagram of the low voltage electrode of the present invention in a first mode of use;

FIG. 10 is a schematic diagram of the low voltage electrode of the present invention in a second mode of use;

in the drawings, the components represented by the respective reference numerals are listed below:

1. an insulating support; 2. a high pressure needle base; 3. a high voltage needle electrode; 4. an adjusting ring; 5. a low voltage electrode; 7. a first plasma; 8. a second plasma; 9. an outer conductor; 11. a step shaft; 12. a front end outer wall; 13. a rear port; 14. a high pressure chamber; 15. a central bore; 21. a pinhole; 22. a threaded hole; 23. a central slot; 41. and a wiring slot.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 1, 2, 3, and 4. The utility model provides a multi-purpose plasma self-sustained excitation electrode, including insulating support 1, the high voltage electrode module, adjusting ring 4, low voltage electrode 5, set up opening up high-pressure chamber 14 in the insulating support 1, the high voltage electrode module is installed in high-pressure chamber 14, insulating support 1 leans on upper portion to set up columniform front end outer wall 12, the inseparable suit of annular adjusting ring 4 and annular low voltage electrode 5 on front end outer wall 12, adjusting ring 4 for adjusting low voltage electrode 5 upper and lower position is located the lower extreme of low voltage electrode 5, insulating support 1 adopts insulating material, high voltage electrode module and low voltage electrode 5 adopt conducting material. The insulating support 1 is made of insulating materials, a high-voltage electrode module is installed through a high-voltage cavity 14 with an upward opening, a low-voltage electrode 5 is fastened through a front-end outer wall 12, and the high-voltage cavity 14 and the front-end outer wall 12 form a cylindrical structure and separate the high-voltage electrode module from the low-voltage electrode 5. The circular high-voltage cavity 14 and the circular front end outer wall 12 are concentric, so that the high-voltage electrode module in the high-voltage cavity 14 and the low-voltage electrode 5 outside the front end outer wall 12 are in concentric positions, and uniform plasma is formed on the upper surface of the insulating support 1. The high-voltage electrode module can be tightly or vertically adjusted and arranged in the high-voltage cavity 14, and the side surface of the high-voltage electrode module for installing the high-voltage needle electrode faces upwards.

The adjusting ring 4 is mounted on the front end outer wall 12 in a vertically adjustable manner, and can be tightly connected in a vertically slidable manner, for example, the adjusting ring 4 can be made of elastic material, or a rubber ring is arranged in the adjusting ring 4, so that the adjusting ring 4 can slide vertically and can be fixed conveniently. The low-voltage electrode 5 is tightly sleeved on the front end outer wall 12, and the lower end of the low-voltage electrode 5 is tightly connected with the upper end face of the adjusting ring 4. When adjusting the adjusting ring 4, the up-down position of the low voltage electrode 5 can be adjusted at the same time. The upper end or top end position defined in the scheme is based on fig. 3, the upper part of the figure is the upper end or top end, and the lower part of the figure is the lower end or bottom end. The bottom of the insulating support 1 is provided with a rear port 13 for mounting a high-voltage lead. The high-voltage needle electrode 3 arranged on the high-voltage electrode module faces upwards and is used for being matched with the low-voltage electrode 5 to form high voltage. The high-voltage electrode module is made of conductive materials. The upper end face of the adjusting ring 4 is provided with a wiring groove 41 for fixing a low-voltage lead wire, so that the low-voltage electrode 5 is conveniently connected with the low-voltage lead wire.

In this embodiment, as shown in fig. 3 and 4. The lower extreme of front end outer wall 12 set up step axle 11, the outer wall of step axle 11 sets up the external screw thread, the diameter of step axle 11 is greater than or equal to the diameter of front end outer wall 12, adjustable ring 4 installs on step axle 11 with threaded connection's mode. The outer wall of the step shaft 11 is provided with an external thread, the inner wall of the adjusting ring 4 is provided with an internal thread, the adjusting ring 4 is connected with the step shaft 11 through threads, the upper position and the lower position of the adjusting ring 4 are adjusted by screwing the adjusting ring 4 left and right, and the upper distance and the lower distance of the low-voltage electrode 5 are adjusted.

In this embodiment, as shown in fig. 3, 4, and 5. The high-voltage electrode module comprises a high-voltage needle base 2 and a high-voltage needle electrode 3, wherein the high-voltage needle base 2 is installed in the high-voltage cavity 14, and the high-voltage needle electrode 3 is upwards fixed on the high-voltage needle base 2. High-voltage needle base 2 is used for fixed high-voltage needle electrode 3, and high-voltage needle base 2 adopts easy conducting material, and high-voltage needle electrode 3 adopts resistant ablation conducting material, and high-voltage needle electrode 3 is fixed to the one end parallel and level of high-voltage needle base 2, and the other end is installed up, and is sharp-pointed towards the upper end, is convenient for form the high pressure with low voltage electrode 5. The high-pressure needle base 2 can be tightly fixed in the high-pressure cavity 14, the high-pressure needle base 2 can also be slidably arranged in the high-pressure cavity 14, and a layer of rubber sleeve can be wrapped outside the high-pressure needle base 2, so that the purposes of fastening and adjusting can be achieved. The high-pressure needle base 2 is made of red copper. The high-voltage needle base 2 is made of red copper which is an extremely conductive material, the resistance is small, and the influence of the high-voltage needle base 2 on the voltage of the high-voltage needle electrode 3 is reduced, so that the high-voltage needle electrode 3 has stable high voltage, and the plasma can be conveniently excited. The high-voltage needle electrode 3 is made of stainless steel materials. The high-voltage needle electrode 3 is made of stainless steel, the stainless steel is an ablation-resistant conductive material, and ablation influence on the high-voltage needle electrode 3 when plasma is formed can be reduced. The insulating support 1 is made of organic glass or nylon materials. The organic glass or nylon material has good insulation property and large breakdown voltage per unit length, and can achieve good insulation effect.

In this embodiment, as shown in fig. 3 and 5. The upper end surface of the high-voltage needle base 2 is uniformly provided with a plurality of needle holes 21 in a circumferential array mode, and the high-voltage needle electrode 3 is fastened in each needle hole 21. After high-pressure needle base 2 installed in high-pressure chamber 14, the up terminal surface sets up most pinhole 21, most pinhole 21 with annular array's mode evenly distributed on circular shape high-pressure needle base 2 up end, and set up multirow pinhole 21 by the inside center of cylindrical high-pressure needle base 2's outer lane, thereby form even intensive pinhole 21 array at high-pressure needle base 2 up end, every pinhole 21 internal fixation inserts high-pressure needle electrode 3, and then can form more even electric field, thereby can produce even plasma. The high-voltage needle electrode 3 array is an excitation emission source of plasma, is an ablation-resistant conductive material, requires the same length, the emission end is a tip, the curvature radius of the tip is as small as possible, the installation end is flush, and the high-voltage needle electrode 3 and the needle hole 21 are installed in a tight fit mode.

In this embodiment, as shown in fig. 3 and 6. The multipurpose plasma self-sustaining exciting electrode further comprises a screw rod used for adjusting the upper position and the lower position of the high-voltage needle base 2, a central hole 15 is formed in the bottom of the insulating support 1, the central hole 15 penetrates through the bottom of the insulating support 1 and the high-voltage cavity 14, a threaded hole 22 is formed in the center of the bottom end of the high-voltage needle base 2, and the screw rod penetrates through the central hole 15 to be matched with the threaded hole 22. The central hole 15 is located at the bottom center of the insulating support 1, and the threaded hole 22 is also located at the center of the bottom end of the high-voltage needle base 2, so as to ensure that the high-voltage needle base 2 is concentric with the insulating support 1, and further the high-voltage needle base 2 is concentric with the low-voltage electrode 5. The central hole 15 can also be designed to be threaded, at the moment, the high-pressure needle base 2 is in clearance fit with the high-pressure cavity 14, and the screw rod is screwed to move up and down relative to the central hole 15, so that the high-pressure needle base 2 is driven to move up and down.

In this embodiment, as shown in fig. 5 and 6. The center of the top of the high-pressure needle base 2 is provided with a center groove 23 with an upward opening. The screw may be rotatably mounted in the central bore 15 such that the screw does not move up or down relative to the central bore 15 when the screw is threaded. The high-pressure needle base 2 is prevented from rotating by the insertion of a screwdriver into the central slot 23, the screw being in threaded connection with the threaded hole 22, the threaded hole 22 moving up and down relative to the screw when the screw is screwed. Because the freedom degree of the screw in the up-and-down direction is fixed, only the high-voltage needle base 2 moves up and down, so that the up-and-down position of the high-voltage needle electrode 3 can be changed, and the effect of changing the electric field intensity is achieved.

In this embodiment, as shown in fig. 7. The low-voltage electrode 5 is of a triangular conical ring structure, and when the low-voltage electrode 5 is installed on the front end outer wall 12, the upward end of the low-voltage electrode 5 is a sharp angle. The annular low-voltage electrode 5 is designed into a triangular cone, and the tip of the annular low-voltage electrode is upward, so that a high-voltage electric field between the low-voltage electrode 5 and the high-voltage electrode module excites plasma.

In this embodiment, as shown in fig. 8. The ratio of the in-plane electrical distance L1+ L2 to the wall thickness L3 of the high pressure chamber 14 ranges from less than or equal to 3. In the present application, the electrical discharge along the surface is critical and is directly related to whether plasma can be generated. The given high voltage of the plasma high-voltage excitation power supply is E, the insulation strength of the edge surface is Uy, the breakdown strength of the high-voltage cavity 14 is Ut, and Ut > E > Uy is required for normally generating plasma. Wherein Uy is U0y (L1+ L2), U0y is the breakdown voltage per unit length along the surface, in kv/cm; Ut-U0 t-L3, U0t is the breakdown voltage per unit thickness, in kv/cm. U0y and U0t relate to insulating materials, the same insulating material, generally U0y >325 × U0 t. By calculation, (L1+ L2)/L3<324 all satisfied the requirements. However, in reality, at a constant L3, Ut is constant, and the larger the value of L1+ L2 is, the larger the value of Uy is, and the larger the voltage E required for the plasma high-voltage excitation power supply is. Therefore, the ratio of (L1+ L2)/L3 is relatively small, and is more economical on the requirement of a plasma high-voltage excitation power supply.

In this embodiment, as shown in fig. 9. A multi-purpose plasma self-sustaining exciting electrode system comprises a plasma high-voltage exciting power supply and a multi-purpose plasma self-sustaining exciting electrode as claimed in any one of claims 1-8, wherein a low-voltage electrode 5 is electrically connected with a low-voltage end of the plasma high-voltage exciting power supply, the low-voltage electrode 5 is grounded, and a high-voltage electrode module of the electrode is electrically connected with a high-voltage end of the plasma high-voltage exciting power supply. When the high-voltage electrode module is connected with the high voltage of an external plasma high-voltage excitation power supply, the low-voltage electrode 5 is connected with the low voltage of the external plasma high-voltage excitation power supply and is grounded, at the moment, the adjusting ring 4 is adjusted up and down to drive the low-voltage electrode 5 to move up and down, further, the electrical distance of the upper edge surface of the insulating support 1 between the high-voltage electrode module and the low-voltage electrode is adjusted, a first plasma 7 is formed on the upper edge surface of the insulating support 1, the formed first plasma 7 is a low-temperature plasma which is self-sustaining stable excitation, uniform dispersion and under the atmospheric environment, and the shape of the first plasma 7 is a circular ring. The electrical distance refers to the closest distance from the discharge surface at the upper end of the high-voltage electrode module to the top end of the low-voltage electrode 5 along the surface of the insulating support 1. The plasma generated in the mode belongs to self-sustaining excitation, is circularly and uniformly dispersed, and can be used for air purification, ozone production, appreciation and the like.

In this embodiment, as shown in fig. 10. A multi-purpose plasma self-sustaining exciting electrode system comprises a plasma high-voltage exciting power supply, an external conductor 9 and the multi-purpose plasma self-sustaining exciting electrode as claimed in any one of claims 1 to 8, wherein a low-voltage electrode 5 is electrically connected with a low-voltage end of the plasma high-voltage exciting power supply, and the low-voltage electrode 5 is grounded; the outer conductor 9 is electrically connected with the low-voltage end of the plasma high-voltage excitation power supply and is grounded; the high-voltage electrode module of the electrode is electrically connected with the high-voltage end of the plasma high-voltage excitation power supply. When an external grounded external conductor 9 (such as metal, liquid, human skin and the like) is close to the high-voltage electrode module, and the electrical distance between the external conductor 9 and the high-voltage electrode module is smaller than the electrical distance between the upper edge surface of the insulating support 1, a second plasma 8 is formed on the upper edge surface of the insulating support 1, the formed second plasma 8 is located between the high-voltage electrode module and the external conductor 9, and the second plasma 8 is conical. In the mode, after an external object is required to approach, plasma can be generated, the external object or the multi-purpose plasma self-sustaining excitation electrode is moved, and the multi-purpose plasma self-sustaining excitation electrode can be used for large-area surface plasma treatment, beauty treatment, sterilization and the like. Similarly, other background gases and pressures can be selected and adjusted through electrode distance or external excitation voltage to produce similar effects.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.