A spiral plasma jet device based on the fire cyclone principle

Abstract

The present invention relates to a spiral plasma jet device based on the fire cyclone principle, used to generate multiple spirally moving plasma arc channels. The device comprises a discharge tube with grooved spiral patterns along its inner side, through which an inert gas is introduced. The plasma discharge device is positioned on the inner central axis of the discharge tube, connected to an external high-voltage pulse power supply, and comprises a needle electrode array as the discharge positive electrode. The spirally moving inert gas flow torsional drives the plasma arc, forming a relatively uniform plasma discharge channel. The device is suitable for various atmospheric pressure plasma processing applications.

Description

Technical Field

[0001] The present invention mainly relates to the fields of plasma physics and engineering, and in particular to a spiral plasma jet device based on the fire cyclone principle. Background Art

[0002] Plasma discharge technology is currently widely used in industry and research. Plasma is used in a variety of processes, such as plasma medicine, plasma cleaning, plasma cutting, and plasma spraying. However, existing plasma discharge technology has some limitations and shortcomings.

[0003] In conventional plasma discharge devices, the arc path often exhibits non-uniform and unstable characteristics, leading to uneven discharge effects and shortened active component lifespan. Furthermore, existing devices often lack a rotational distribution of the plasma arc path, limiting comprehensive workpiece handling and processing capabilities.

[0004] Therefore, a new plasma discharge device is needed to address the problems of the existing technology. This patented invention installs a plasma discharge device within a discharge tube and allows inert gas to enter the discharge tube along grooves within the tube, driving the plasma arc inside the discharge tube to perform spatial spiral motion with a constant pitch. This novel design and structure is expected to improve the uniformity, stability, and processing effects of plasma discharge, providing a better solution for plasma processing.

[0005] In summary, existing plasma discharge devices have some shortcomings and need to be improved to achieve better processing results. This patented invention aims to solve the problems of the existing technology by using inert gas to guide and control the plasma discharge process to produce a uniform spiral distribution of plasma arc channels, thereby providing a higher quality and more stable plasma processing method and device. Summary of the Invention

[0006] The present invention relates to a spiral plasma jet device based on the fire cyclone principle. Its characteristics include the uniform injection of inert gas along the grooves on the inner wall of a discharge tube, forming a spiraling forward airflow inside the discharge tube. Simultaneously, a plasma discharge device is positioned on the central axis of the discharge tube. This design produces a uniformly distributed spiral plasma arc channel, providing improved effects and controllability for plasma processing. This invention is primarily applicable to processes such as plasma cutting and plasma spraying, and has broad practical applications and economic benefits.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A spiral plasma jet device based on the fire cyclone principle. The plasma jet device is based on the fire cyclone principle and is combined with a discharge tube with a tube wall thickness of 2-5 mm. The plasma is driven to perform a spiral forward motion by the twisting of an inert gas flow, aiming to improve the uniformity of the plasma discharge channel and achieve effective extension of the plasma discharge length.

[0009] Furthermore, the plasma jet device includes a discharge tube, a needle electrode array and a high-voltage pulse power supply. The discharge tube is a cylindrical hollow structure, and the inner tube wall is provided with sinusoidally evenly arranged spiral patterns and grooves. The corresponding grooves are all provided with air inlets. One side of the air inlet is connected to the inert gas storage tank through a pipeline, and the other side is connected to the air guide pipe leading to the inner cavity of the discharge tube. The discharge base is embedded in the central axis of the discharge tube, and the negative pole of the drainage cover is grounded.

[0010] Furthermore, the discharge needles distributed on the side of the discharge base are arranged in the form of an equilateral triangle, the bottom distance between any two adjacent discharge needles is equal, the tips of the discharge needles are on the same ellipsoidal surface, and the needle electrode array composed of the discharge needles serves as the discharge positive electrode and is connected to the high-voltage pulse power supply through a wire.

[0011] Furthermore, the drainage cover is a cone made of conductive material, the edge of the opening is provided with a bayonet for clamping the discharge tube, and the exhaust port is provided in a groove corresponding to the junction of the drainage cover and the discharge tube.

[0012] Furthermore, the inert gas supply part includes a gas storage tank, a regulating valve and a pressure gauge. The gas storage tank is used to store nitrogen, and the regulating valve controls the flow rate of the inert gas and adjusts it according to the required gas supply volume.

[0013] Furthermore, an air guide pipe is tightly arranged in each spiral groove of the section from the air inlet to the discharge base, and the air guide pipe extends to the edge of the discharge device base.

[0014] Compared with the existing technology, the beneficial effects of the present invention are:

[0015] (1) Uniformly rotating spiral distribution: Inert gas enters along the inner groove of the discharge tube and generates a uniformly rotating plasma arc channel inside the discharge tube, achieving uniform distribution and spiral motion of the plasma arc. This distribution and motion can effectively extend the length of the arc discharge channel, provide a wider contact area, and improve the distribution density of the plasma.

[0016] (2) Uniformity and stability: Since the plasma arc channel is distributed in a spiral shape, its uniform distribution makes the plasma energy distribution more uniform throughout the channel. This uniformity helps improve the stability of the processing process and avoid processing defects caused by local overheating or uneven energy distribution.

[0017] (3) Wide range of applications: The application scope of this invention covers the fields of plasma medicine, plasma cleaning, plasma cutting, plasma spraying, etc. Since the generated plasma arc has a uniform spiral distribution characteristic, this invention can be applied to atmospheric pressure processing and treatment of various materials, and has good adaptability and effect for cutting or spraying different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a spiral plasma jet device based on the fire cyclone principle.

[0019] Figure 2 This is a cross-sectional view of the spiral structure of the discharge tube.

[0020] Figure 3 This is a cross-sectional diagram of the needle electrode array and gas guide tube distribution inside the discharge tube.

[0021] Figure 4 This is a simplified three-dimensional schematic diagram of the discharge base needle electrode array.

[0022] Figure 5 This is a schematic diagram of the built-in drainage cover at the tail of the discharge tube.

[0023] Figure: 1. Discharge tube 2. Spiral pattern 3. Groove 4. Air inlet 5. Discharge base 6. Discharge needle 7. High-voltage pulse power supply 8. Drain cover 9. Air duct 10. Gas tank 11. Regulating valve 12. Pressure gauge 13. Plasma arc 14. Wrap angle α DETAILED DESCRIPTION

[0024] The following combination Figure 1-Figure 5 , further elaborating on specific embodiments of the present invention. The present invention discloses a spiral plasma jet device based on the fire cyclone principle. The device, incorporating a discharge tube with a wall thickness of 2-5 mm, uses an inert gas flow to twist and drive the plasma into a spiral forward motion, generating a uniformly spirally distributed plasma arc channel. This improves the uniformity of the plasma discharge channel and effectively extends the plasma discharge length.

[0025] refer to Figure 1 and Figure 2, comprising a discharge tube 1, a needle electrode array, and a high-voltage pulse power supply 7. The discharge tube 1 is a cylindrical hollow structure with an aperture of 15 to 40 mm and a length of 150 to 400 mm. It is made of a colorless and transparent quartz dielectric material. The inner tube wall is provided with sinusoidally evenly arranged spiral patterns 2 and grooves 3. The spiral patterns 2 are right-handed (or left-handed), and their winding angle α is adjustable from 0 to 90 degrees. The corresponding grooves 3 are each provided with an air inlet 4. One side of the air inlet 4 is connected to an inert gas storage tank 10 through a pipeline, and the other side is connected to an air guide pipe 9 leading to the inner cavity of the discharge tube 1. The discharge base 5 is embedded in the central axis of the discharge tube 1 and is made of an insulating material. The drainage cover 8 is grounded.

[0026] The inert gas supply part includes a gas storage tank 10, a regulating valve 11 and a pressure gauge 12. The gas storage tank 10 is used to store nitrogen, and the regulating valve 11 controls the flow rate of the inert gas and adjusts it according to the required gas supply amount.

[0027] An air guide tube 9 is tightly arranged in each spiral groove 3 from the air inlet 4 to the discharge base 5 , and the air guide tube 9 extends to the edge of the discharge device base 5 .

[0028] refer to Figure 3 and Figure 4 The discharge needles 6 distributed along the sides of the discharge base 5 are arranged in an equilateral triangle. The bases of any two adjacent discharge needles 6 are equidistant from each other, and the tips of the discharge needles 6 are on the same ellipsoidal surface. This arrangement helps reduce the mutual influence of the electromagnetic field distribution within the needle electrode array. The needle electrode array composed of the discharge needles 6 serves as the discharge positive electrode and is connected to the high-voltage pulse power supply 7 via wires. High-frequency DC pulses are applied to the needle electrode array 6, generating a high-frequency electric field, thereby generating a plasma arc 13 within the needle electrode array.

[0029] refer to Figure 5 The shroud 8 is a conical shape made of conductive material. Its opening edge is equipped with a clip for engaging the discharge tube 1. The exhaust port is defined by a corresponding groove 3 at the junction of the shroud 8 and the discharge tube 1. The shroud 8 evenly disperses the airflow to each outlet, ensuring uniform rotation of the plasma arc within the discharge tube 1. It also has an adjustment function to control the speed and direction of the plasma's rotation.

[0030] Although the embodiments of the present invention have been shown and described above, it is apparent to those skilled in the art that corresponding modifications and variations can be made based on the present invention, which are all within the scope of protection of the present invention.

Claims

1. A spiral plasma jet device based on the fire cyclone principle, characterized by: The plasma jet device comprises a discharge tube (1), a needle electrode array and a high-voltage pulse power supply (7). The plasma jet device is based on the fire cyclone principle and is combined with a specially designed discharge tube (1). The plasma is driven to move in a spiral by the twisting of an inert gas flow, thereby improving the uniformity of the plasma discharge channel and achieving effective extension of the plasma discharge length. The discharge tube (1) is a cylindrical hollow structure, and the inner tube wall is provided with sinusoidally evenly arranged spiral patterns (2) and grooves (3), and the corresponding grooves (3) are each provided with an air inlet (4), one side of the air inlet (4) is connected to an inert gas storage tank (10) through a pipeline, and the other side is connected to an air guide pipe (9) leading to the inner cavity of the discharge tube (1), the discharge base (5) is embedded in the central axis of the discharge tube (1), and the drainage cover (8) is grounded; The discharge needles (6) distributed on the side of the discharge base (5) are arranged in the form of an equilateral triangle, the distance between the bottoms of any two adjacent discharge needles (6) is equal, the tips of the discharge needles (6) are on the same ellipsoidal surface, and the needle electrode array composed of the discharge needles (6) serves as a discharge positive electrode and is connected to the high-voltage pulse power supply (7) through a wire.

2. The spiral plasma jet device based on the fire cyclone principle according to claim 1, characterized in that: The drainage cover (8) is a cone made of conductive material, and the edge of the opening is provided with a bayonet for clamping the discharge tube (1). The groove (3) corresponding to the junction of the drainage cover (8) and the discharge tube (1) is provided with an exhaust port.

3. The spiral plasma jet device based on the fire cyclone principle according to claim 1, characterized in that: The inert gas supply part comprises a gas storage tank (10), a regulating valve (11) and a pressure gauge (12). The gas storage tank (10) is used to store the inert gas, and the regulating valve (11) controls the flow rate of the inert gas and adjusts it according to the required gas supply amount.

4. The spiral plasma jet device based on the fire cyclone principle according to claim 1, characterized in that: An air guide tube (9) is tightly arranged in each spiral groove (3) in the section from the air inlet (4) to the discharge base (5), and the air guide tube (9) extends to the edge of the discharge device base (5).

Images