Plasma generating apparatus and arc starting method

Abstract

The application discloses a kind of plasma generating device and its arc starting method, including end face cathode, barrel cathode, multi-section insertion pole and anode connected in turn in sequence;Potential insulation is kept between each electrode, and the potential insulation or communication of end face cathode and barrel cathode, without complex arc starting pole, and discharge gas is injected from the gap between each electrode.The application has simple structure design, easy installation and maintenance, no arc starting unit or trigger unit, lower cost, long service life, high arc starting success rate.

Description

Technical Field

[0001] This invention relates to the field of plasma technology, and more specifically to a plasma generating device and its arc initiation method. Background Technology

[0002] Traditional DC arc plasma torches, such as the multi-segment distributed rotating air intake non-transfer arc long arc high-power plasma torch (application number 201520622783.7), have the following disadvantages and deficiencies: complex structural design, high cost, simple cathode, short lifespan, the need for an arc initiation unit or triggering unit, requiring an additional arc initiation power supply, and low arc initiation success rate. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a plasma generator and its arc initiation method, which eliminates the need for a separate arc initiation unit or triggering unit, resulting in lower cost, longer lifespan, and higher arc initiation success rate.

[0004] This invention provides a plasma generating device, which is composed of an end-face cathode, a barrel cathode, a multi-segment insertion electrode, and an anode connected in sequence.

[0005] The barrel cathode and multi-segment insertion electrode are nested from insulating support modules and internal conductive modules. They all have a hollow rotary structure at their center, which are sequentially connected to form a discharge channel. The end of the discharge channel is the end-face cathode, which is a metal protrusion located at the center of the rotary section at the end of the discharge channel cathode. It faces away from the plasma and is cooled by circulating water. The internal conductive metal module has a hollow rotary structure at its center, and the insulating support module has a hollow rotary structure at its center. The dimension of the insulating support module in the rotation axis of the rotary structure is larger than the corresponding dimension of the internal barrel-shaped conductive module, ensuring potential insulation between the conductive modules when it is sequentially connected with other electrodes. The anode is the electrode with a hollow rotary structure at the center at the other end of the discharge channel. The electrodes maintain potential insulation. The end-face cathode and the barrel cathode are potentially insulated or connected, and there is no complex arc-starting electrode. The discharge gas is introduced from the gaps between the electrodes.

[0006] Preferably, the barrel cathode is formed by nesting an insulating support module and an internal barrel-shaped conductive module.

[0007] Preferably, the multi-segment insertion electrode is formed by nesting an insulating support module and an internal barrel-shaped conductive module.

[0008] Preferably, the insulation support module is equipped with a water-cooling channel.

[0009] Preferably, the potential portion of the barrel cathode and the multi-segment insertion electrode or the multi-segment insertion electrode is connected.

[0010] This invention also provides an arc initiation method for a plasma generator, applicable to any of the plasma generators described in the above embodiments, the method comprising:

[0011] Step 1: Connect the plasma generator to water cooling and connect the air intake;

[0012] Step 2: Connect a voltage of not less than 5kV between the end face cathode and anode, or between the barrel cathode and anode, and maintain the voltage for not less than 5ms.

[0013] Step 3: Under the condition that the high voltage involves multiple inserted electrodes between the cathode and anode, the gaps between the electrodes directly break down and push the plasma into the discharge channel. After that, the main discharge channel breaks down to generate a stable plasma discharge jet.

[0014] Step four: After the high voltage is directly broken down between the cathode and anode by multiple inserted electrodes, the high voltage is shut off, and the arc initiation is completed.

[0015] Preferably, one end of the high-voltage circuit is connected to the anode, and the other end is connected to the end face cathode, the barrel cathode, or both cathodes are connected simultaneously.

[0016] Preferably, during the gas breakdown process, the multiple segments inserted between the electrodes also break down.

[0017] This invention provides a plasma generating device and its arc initiation method, comprising an end-face cathode, a barrel cathode, a multi-segment insertion electrode, and an anode connected in sequence; the electrodes maintain potential insulation between each other, the end-face cathode and the barrel cathode are potential-insulated or connected, and there is no complex arc initiation electrode; discharge gas is introduced through the gaps between the electrodes. This invention features a simple structural design, convenient installation and maintenance, no arc initiation unit or triggering unit, low cost, long lifespan, and high arc initiation success rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a plasma generating device provided in an embodiment of the present invention.

[0019] Among them, 1 is the end face cathode, 2 is the barrel cathode, 3 is the multi-segment insertion electrode, 4 is the anode, 1.1 is the cathode head, 2.1 is the internal barrel-shaped conductive module, 2.2 is the insulation support module, 3.1 is the internal barrel-shaped conductive module, 3.2 is the insulation support module, and 4.1 is the anode barrel. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will now be described with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terms "upper," "lower," "left," and "right" used in the embodiments of this application are merely descriptions of positional relationships and do not constitute a limitation on the specific structural position. The accompanying drawings shown in this application are only examples of one structural relationship and do not constitute a limitation on the specific structure of the solution.

[0022] The present invention solves its technical problem by adopting the following technical solution: a plasma generating device and an arc initiation method, wherein the device is composed of an end face cathode, a barrel cathode, a multi-segment insertion electrode and an anode connected in sequence;

[0023] The barrel cathode and multi-segment insertion electrode are nested from insulating support modules and internal conductive modules. They all have a hollow rotary structure at their center, which are sequentially connected to form a discharge channel. The end of the discharge channel is the end-face cathode, which is a metal protrusion located at the center of the rotary section at the end of the discharge channel cathode. It faces away from the plasma and is cooled by circulating water. The internal conductive metal module has a hollow rotary structure at its center, and the insulating support module has a hollow rotary structure at its center. The dimension of the insulating support module in the rotation axis of the rotary structure is larger than the corresponding dimension of the internal barrel-shaped conductive module, ensuring potential insulation between the conductive modules when it is sequentially connected with other electrodes. The anode is the electrode with a hollow rotary structure at the center at the other end of the discharge channel. The electrodes maintain potential insulation. The end-face cathode and the barrel cathode are potentially insulated or connected, and there is no complex arc-starting electrode. The discharge gas is introduced from the gaps between the electrodes.

[0024] In a preferred embodiment, the barrel cathode is composed of an insulating support module and an internal barrel-shaped conductive module nested together.

[0025] In a preferred embodiment, the multi-segment insertion pole is composed of an insulating support module and an internal barrel-shaped conductive module nested together.

[0026] As a preferred embodiment, the insulation support module is provided with a water-cooling channel.

[0027] In a preferred embodiment, the potential between the barrel cathode and the multi-segment insertion electrode or the multi-segment insertion electrode can be partially connected.

[0028] This invention also provides an arc-initiating method for a plasma generator, applicable to any of the plasma generators described in the above embodiments, the method comprising the following steps:

[0029] Step 1: Connect a plasma generator to water cooling and connect it to the air intake;

[0030] Step 2: Connect a voltage of not less than 5kV between end face cathode 1 and anode 4 or between barrel cathode 2 and anode 4, and maintain the voltage for a duration of not less than 5ms.

[0031] Step 3: Under high voltage, with the participation of multiple intercalation electrodes between the cathode and anode, the gaps between the electrodes directly break down, and the plasma is pushed into the discharge channel. After the main discharge channel breaks down, a stable plasma discharge jet is generated.

[0032] Step 4: After the high voltage is directly broken down between the cathode and anode 4 by multiple inserted electrodes 3, the high voltage is shut off, and the arc initiation is completed.

[0033] In one preferred embodiment, one end of the high voltage is connected to the anode, and the other end is connected to the end face cathode, the barrel cathode, or both cathodes are connected simultaneously.

[0034] In a preferred embodiment, during the gas breakdown process, the multiple segments inserted between the electrodes also break down.

[0035] The advantages of this invention are that it has a simple structural design, is easy to install and maintain, does not require an arc-starting unit or triggering unit, has a low cost, a long lifespan, and a high arc-starting success rate.

[0036] It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered to be within the scope of protection of this invention.

Claims

1. A plasma generating device, characterized in that, The device is composed of an end-face cathode, a barrel cathode, a multi-segment insertion electrode, and an anode connected in sequence. The barrel cathode and multi-segment insertion electrode are nested from insulating support modules and internal conductive modules. They all have a hollow rotary structure at their center, which are sequentially connected to form a discharge channel. The end of the discharge channel is the end-face cathode, which is a metal protrusion located at the center of the rotary section at the end of the discharge channel cathode. It faces away from the plasma and is cooled by circulating water. The internal conductive metal module has a hollow rotary structure at its center, and the insulating support module has a hollow rotary structure at its center. The dimension of the insulating support module in the rotation axis of the rotary structure is larger than the corresponding dimension of the internal barrel-shaped conductive module, ensuring potential insulation between the conductive modules when it is sequentially connected with other electrodes. The anode is the electrode with a hollow rotary structure at the center at the other end of the discharge channel. The electrodes maintain potential insulation. The end-face cathode and the barrel cathode are potentially insulated or connected, and there is no complex arc-starting electrode. The discharge gas is introduced from the gaps between the electrodes.

2. The plasma generating device according to claim 1, characterized in that, The barrel cathode is composed of an insulating support module and an internal barrel-shaped conductive module nested together.

3. The plasma generating device according to claim 1, characterized in that, The multi-segment insertion electrode is composed of an insulating support module and an internal barrel-shaped conductive module nested together.

4. The plasma generating apparatus according to claim 2 or 3, characterized in that, The insulation support module is equipped with a water-cooling channel.

5. The plasma generating device according to claim 1, characterized in that, The potential is either insulated or partially connected between the barrel cathode and the multi-segment insertion electrode or the multi-segment insertion electrode.

6. A method for initiating an arc in a plasma generator, characterized in that, The method is applicable to any of the plasma generating devices according to claims 1 to 5, and the method includes: Step 1: Connect the plasma generator to water cooling and connect the air intake; Step 2: Connect a voltage of not less than 5kV between the end face cathode and anode, or between the barrel cathode and anode, and maintain the voltage for not less than 5ms. Step 3: Under the condition that the high voltage involves multiple inserted electrodes between the cathode and anode, the gaps between the electrodes directly break down and push the plasma into the discharge channel. After that, the main discharge channel breaks down to generate a stable plasma discharge jet. Step four: After the high voltage is directly broken down between the cathode and anode by multiple inserted electrodes, the high voltage is shut off, and the arc initiation is completed.

7. The arc initiation method of a plasma generator according to claim 6, characterized in that, One end of the high voltage is connected to the anode, and the other end is connected to the end face cathode, the barrel cathode, or both cathodes are connected simultaneously.

8. The arc initiation method of a plasma generator according to claim 6, characterized in that, During the gas breakdown process, multiple segments inserted between electrodes also break down.

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