Self-cleaning plasma generator for combustible medium plasma ignition
By incorporating an anode, cathode, and insulating components into the plasma generator, along with a purging assembly and a drain hole, the short-circuit problem caused by impurity contamination in plasma ignition technology was solved, achieving stable and reliable plasma ignition.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU MINGWEI BURNING CONTROL EQUIP CO LTD
- Filing Date
- 2025-03-24
- Publication Date
- 2026-05-01
AI Technical Summary
Existing plasma ignition technology is susceptible to contamination from impurities such as oil, water, and mud, which can cause short circuits inside the plasma generator, affecting ignition stability and safety, especially in severe weather conditions.
A self-cleaning plasma generator was designed, which uses an anode assembly, a cathode assembly, and an insulating assembly in combination. An insulating assembly and a purging assembly are set up. The insulating assembly isolates the cathode and anode, while the purging assembly cleans the plasma generation chamber to prevent impurities from entering and discharges impurities from the chamber through a drain hole. The purging assembly guides the plasma flow in a specific direction.
It effectively prevents impurities such as oil, water, mud, rain, and snow from entering the electrode, ensuring the stability and reliability of plasma generation, improving the conductivity stability and safety of the electrode, and ensuring the continuity and cleanliness of plasma ignition.
Smart Images
Figure CN224192115U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ignition technology for flares in metallurgical steelmaking, flares in chemical and oil and gas surface construction, and exhaust gases (well control exhaust, blowout exhaust, oil and gas testing exhaust) in oil and gas drilling, and particularly to a self-cleaning plasma generator for plasma ignition of combustible media. Background Technology
[0002] In the metallurgical and steel production process, metallurgical processing generates a large amount of waste gas. To reduce the pollution of the environment and atmosphere caused by this waste gas, environmental protection treatment is usually required. Furthermore, during oil and gas drilling operations, well control, blowout prevention, and oil testing processes generate flammable and toxic gases, which also typically require environmental protection treatment. Finally, in oil and gas fields (purification plants) and chemical production areas, environmental protection treatment is also necessary for gases emitted during accidents, equipment maintenance, and production processes. Currently, the environmental protection treatment of these emitted gases involves combustion to convert the gases into combustible gases before releasing them into the atmosphere, thereby reducing direct emissions and achieving environmental protection goals.
[0003] With the development of ignition technology for controlling the combustion of exhaust gases, plasma ignition has become widely used due to its unique advantages, such as high ignition energy, spontaneous generation of high-temperature plasma of a certain length, no need for auxiliary ignition fuel medium, and strong self-cleaning ability. However, current plasma ignition technology still suffers from the drawback of easy contamination of the plasma generator (plasma ignition electrode). The root cause of this defect is that the exhaust gas contains impurities such as oil, water, and mud, and the external environment where the electrode is located may experience severe weather such as rain or snow, which can easily lead to short circuits inside the plasma generator, preventing plasma generation and causing plasma ignition failure, thus posing a significant safety hazard. Therefore, designing a plasma generator (plasma ignition electrode) with strong anti-contamination capabilities and high stability and reliability has become an urgent need for the development of plasma ignition technology. Utility Model Content
[0004] The purpose of this invention is to provide a self-cleaning plasma generator for ignition of combustible media with an anti-pollution clean structure that improves the ionization stability and reliability of the electrodes. This addresses the problem that the exhaust gas to be ignited contains impurities such as oil, water, and mud, and that the external environment where the electrodes are located may experience severe weather such as rain or snow, which can easily cause short circuits inside the plasma generator, preventing plasma generation and leading to plasma ignition failure.
[0005] The technical solution adopted in this utility model is as follows: a self-cleaning plasma generator for plasma ignition of combustible media, comprising an anode assembly and a cathode assembly that cooperate to generate plasma, wherein the cathode assembly is detachably inserted into the anode assembly, and an insulating assembly is provided between the anode assembly and the cathode assembly to isolate the cathode and the anode by wrapping the cathode assembly with a non-fouling coating; a purging assembly is also provided on the outside of the anode assembly to be inserted into the plasma generation chamber defined by the anode assembly to perform airflow purging and cleaning of the chamber space and to guide the directional flow of plasma.
[0006] According to a preferred embodiment, the anode front cone of the anode assembly is fitted onto the top port of the anode rear end seat in a manner that defines a plasma generation chamber; an insulating mounting sleeve for limiting and accommodating the cathode assembly and the insulating assembly is inserted into the lower end face of the anode rear end seat.
[0007] According to a preferred embodiment, drain holes are provided circumferentially at intervals on the bottom surface of the anode rear end seat in a manner that surrounds the insulator mounting sleeve.
[0008] According to a preferred embodiment, the cathode assembly includes a cathode head, a cathode middle section, and a cathode locking nut, wherein the cathode middle section is inserted into the bottom of the cathode head, and the cathode locking nut, which defines the mounting position of the insulating assembly on the cathode middle section, is connected to the lower axial end of the cathode middle section.
[0009] According to a preferred embodiment, a central vertical hole for inserting the middle section of the cathode and an extended vertical hole for accommodating part of the insulating component are provided at the bottom of the cathode head.
[0010] According to a preferred embodiment, the bottom edge of the cathode head is further provided with an outwardly flared ring that can guide the waste liquid entering the plasma generation chamber and shield the assembly gap.
[0011] According to a preferred embodiment, an insulator locking nut is provided on the bottom side of the inner cavity of the insulator mounting sleeve to adjustably define the working position of the insulating component inside it.
[0012] According to a preferred embodiment, the insulating assembly includes an insulating cover and an insulator, wherein a plurality of the insulators are stacked in a plug-in manner to form an insulating isolation sleeve that can separate the insulator mounting sleeve from the middle section of the cathode, and the top of the insulating isolation sleeve assembled from the insulators is fitted with the insulating cover that can be inserted into the extended vertical hole and connected to the cathode head.
[0013] According to a preferred embodiment, a shielding ring plate is further provided on the main body of the insulating cover to block the axial upper opening of the insulating mounting sleeve.
[0014] According to a preferred embodiment, the purging assembly includes a purging line, a purging line connecting flange, and a purging fan, wherein the purging line is installed on the outer side of the insulator mounting sleeve, and the axial lower end of the purging line is connected to the purging fan through the purging line connecting flange.
[0015] The beneficial effects of this utility model are:
[0016] The drainage hole provided in this application can drain oil, water, mud, and rain / snow from the plasma generation chamber, preventing the accumulation of these substances in the plasma generation chamber and thus avoiding short circuits in the electrode circuits.
[0017] The cathode head of this application uses an outward-flaring horn ring at its bottom to shield the bottom opening and effectively guide the flow of oil and water adhering to its surface. This effectively prevents oil, water, mud, and rain and snow from entering the interface from the bottom, thus preventing defects such as electrode short circuits caused by the intrusion of oil, water, mud, and rain and snow, and improving the conductivity stability of the electrode.
[0018] The insulating cover provided in this application can effectively connect with the cathode head, effectively shielding the middle section of the cathode and preventing contamination from oil or water, which could affect the stability and safety of conductivity. The insulating cover also effectively seals the upper opening of the insulator mounting sleeve, preventing oil or water that may be present in the plasma generation chamber from entering the sleeve and ensuring effective internal isolation. The insulator in this application is designed as a tubular structure that facilitates insertion and stacking, allowing for easy assembly according to actual length requirements. This improves the convenience and efficiency of disassembly and maintenance. Furthermore, since insulators made of insulating ceramic are prone to breakage and damage that could affect insulation performance, the tubular insulator allows for easy replacement, reducing replacement costs and maintenance difficulty.
[0019] The purge assembly described in this application delivers an airflow that effectively passes through the inner cavity of the anode front cone. This airflow is then directed upwards from the opening at the top of the anode front cone, effectively preventing oil, water, mud, and rain / snow from falling into the plasma generation chamber through the top opening of the anode front cone during plasma ignition. This ensures the cleanliness of the plasma generation chamber during ionization, guaranteeing the stability and reliability of plasma ignition. Furthermore, the airflow from the purge line effectively guides the plasma to move in a specific direction, forming a continuous flow of dynamic plasma at the top opening of the anode front cone, thus achieving stability and continuity of the ignition flame. Finally, the airflow can also create a local negative pressure in the cone at the front end of the anode, thereby driving the external cold air to be quickly drawn in from the drain hole on the bottom surface of the anode rear end seat. This accelerates the gas replacement in the plasma generation chamber, enabling the plasma generation chamber to dissipate heat quickly and effectively through air exchange. This effectively transfers the heat generated during ionization in the plasma generation chamber, reduces the working temperature in the chamber, and improves the stability of the ionized plasma. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of a preferred self-cleaning plasma generator for ignition of combustible media proposed in this utility model.
[0021] Figure 2 This is a schematic diagram of the anode assembly of a preferred self-cleaning plasma generator for ignition of combustible media proposed in this utility model.
[0022] Figure 3 This is a schematic diagram of the cathode assembly of a preferred self-cleaning plasma generator for ignition of combustible media proposed in this utility model.
[0023] Figure 4 This is a schematic diagram of the structure of the insulating component of a preferred self-cleaning plasma generator for ignition of combustible media proposed in this utility model.
[0024] Figure 5 This is a schematic diagram of the purging assembly of a preferred self-cleaning plasma generator for ignition of combustible media proposed in this utility model.
[0025] List of reference numerals
[0026] 1: Anode assembly; 2: Cathode assembly; 3: Insulation assembly; 4: Purge assembly; 11: Anode front cone; 12: Locking screw; 13: Locking screw; 14: Insulator mounting sleeve; 15: Insulator locking nut; 16: Anode connecting flange; 111: Through mounting hole; 121: Drainage hole; 21: Cathode head; 22: Cathode middle section; 23: Cathode locking nut; 211: Central vertical hole; 212: Extended vertical hole; 213: Outer horn ring; 31: Insulation cover; 32: Insulator; 311: Shielding ring plate; 312: Embedded ring groove; 41: Purge pipeline; 42: Purge pipeline connecting flange; 43: Purge fan; 44: Thermal insulation layer; 411: Insulation sleeve layer. Detailed Implementation
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] The following is a detailed explanation with reference to the accompanying drawings. Example
[0029] This application provides a self-cleaning plasma generator for plasma ignition of combustible media, which includes an anode assembly 1, a cathode assembly 2, an insulation assembly 3, and a purging assembly 4.
[0030] according to Figures 1-5 In one specific embodiment, the anode assembly 1 and cathode assembly 2 cooperate to form an ionization gap, thereby enabling them to generate plasma in the ionization gap when each is connected to a circuit. The cathode assembly 2 is detachably inserted into the anode assembly 1. An insulating assembly 3 is provided between the anode assembly 1 and the cathode assembly 2 to protect the cathode assembly 2 from contamination and isolate the cathode and anode. A purging assembly 4 is also provided outside the anode assembly 1 to be inserted into the plasma generation chamber defined by the anode assembly 1 to purge and clean the chamber space and guide the directional flow of plasma. The insulating assembly 3 provided in this application can separate the anode assembly 1 and the cathode assembly 2 and effectively enclose the cathode assembly 2, effectively preventing oil, water, mud, and rain and snow in the exhaust gas from entering the internal electrode circuit and causing short circuits, ensuring the effective occurrence of the electrode ionization process, thereby stably and effectively generating plasma to achieve effective plasma ignition. Furthermore, the purging assembly 4 can effectively clean the ionization gap and remove contaminants from the electrode surface, improving the anti-contamination capability and operational reliability of the plasma generator.
[0031] Preferably, the anode assembly 1 includes an anode front cone 11, an anode rear seat 12, a locking screw 13, an insulator mounting sleeve 14, an insulator locking nut 15, and an anode connecting flange 16. Preferably, the anode front cone 11 of the anode assembly 1 is sleeved on the top port of the anode rear seat 12, so that the anode front cone 11 and the anode rear seat 12 cooperate to define a plasma generation chamber. More preferably, the relative position between the anode front cone 11 and the anode rear seat 12 is defined by a locking screw 13 that penetrates the shell wall of the overlapping area of their sleeves. Preferably, an insulator mounting sleeve 14 is inserted into the lower end face of the anode rear seat 12 to connect it to the anode power supply and to limit and accommodate the cathode assembly 2 and the insulating assembly 3. Preferably, an insulator locking nut 15 is provided on the bottom side of the inner cavity of the insulator mounting sleeve 14 to adjustably define the working position of the insulating assembly 3 inside. Preferably, the anode connecting flange 16 is also connected to the axial lower end of the insulator mounting sleeve 14. Preferably, the insulator mounting sleeve 14 is connected to the anode rear end seat 12 by means of threaded connection, welding, or other methods. More preferably, the insulator mounting sleeve 14 is a conductive metal tube, which can be connected to a power source through the anode connection flange 16.
[0032] Preferably, a through mounting hole 111 for inserting the purge line 41 of the purge assembly 4 is provided on the side of the anode front cone 11. The through mounting hole 111 provided in this application allows the outlet of the purge line 41 to be inserted into the plasma generation chamber, thereby facilitating the directional flow of air in the chamber. Preferably, a plurality of drainage holes 121 for draining the waste liquid in the plasma generation chamber are provided circumferentially at intervals on the bottom surface of the anode rear seat 12 in a manner surrounding the insulator mounting sleeve 14. The drainage holes 121 provided in this application can drain oil, water, mud, and rain and snow in the plasma generation chamber, avoiding the accumulation of oil, water, mud, rain and snow in the plasma generation chamber and causing short circuits in the electrode circuit, ensuring the empty state of the plasma generation chamber, maintaining the state of the ionization gap, and facilitating the ionization generation of plasma.
[0033] Preferably, the cathode assembly 2 includes a cathode head 21, a cathode middle section 22, and a cathode locking nut 23. Preferably, the cathode middle section 22 is coaxially inserted into the bottom of the cathode head 21. More preferably, the axial lower end of the cathode middle section 22 is connected to a cathode locking nut 23 that can define the mounting position of the insulating assembly 3 on the cathode middle section 22. The cathode middle section 22 can be effectively wrapped by the insulating assembly 3 and the cathode head 21 made of high-temperature stainless steel, ensuring sufficient insulation and effective anti-contamination barrier, and ensuring the stability of ionized power transmission. The cathode middle section 22 can be stably and fully inserted into the cathode head 21 under the limiting position of the insulating assembly 3, ensuring the effectiveness of conductive contact.
[0034] Preferably, a central vertical hole 211 for inserting the cathode middle section 22 and an extended vertical hole 212 for accommodating the insulating component 3 partially fitted onto the cathode middle section 22 are provided at the bottom of the cathode head 21, thereby allowing the upper axial end of the insulating component 3 to be inserted and mated with the cathode head 21, thus isolating the cathode middle section 22 from the anode component 1. Preferably, the bottom edge of the cathode head 21 is also provided with an outwardly extending horn-shaped ring 213 that can form an inclined downwardly extending annular plate structure to guide the flow of contaminants entering the plasma generation chamber and to shield the assembly gap to prevent contaminants from entering. The cathode head 21 of this application shields the bottom opening with the outwardly extending horn-shaped ring 213 at its bottom and effectively guides the flow direction of oil and water adhering to its surface, thereby effectively preventing oil, water, mud, and rain and snow from entering the interface from the bottom, preventing defects such as electrode short circuits caused by the intrusion of oil, water, mud, and rain and snow, and improving the conductivity stability of the electrode.
[0035] Preferably, the insulating assembly 3 includes an insulating cover 31 and an insulator 32. Preferably, a plurality of insulators 32 are stacked in a plug-in manner to form an insulating isolation sleeve that can be used to insert the cathode middle section 22 and separate the insulator mounting sleeve 14 from the cathode middle section 22. More preferably, the top of the insulating isolation sleeve assembled from the insulators 32 is fitted with an insulating cover 31 that can be inserted into the extended vertical hole 212 and connected to the cathode head 21, so that the insulating isolation sleeve formed by the insulating cover 31 and the insulators 32 can effectively separate the cathode middle section 22 from the insulator mounting sleeve 14. Specifically, the insulator locking nut 15 defines the assembly form of the insulating cover 31 and the insulator 32 by abutting against the bottom end of the insulator 32. The insulating cover 31 and insulator 32 provided in this application can cooperate to form an insulating partition sleeve that completely isolates the cathode middle section 22 from the anode assembly 1, thereby effectively defining the plasma generation area and location. This ensures that the ionization process only occurs between the cathode head 21 and the anode front cone 11, preventing inductive ionization between the cathode middle section 22 and the anode rear seat 12, preventing leakage and abnormal electrolysis, ensuring the accuracy and regionality of the ionization location, and allowing the plasma to be effectively drawn by the airflow. The insulating cover 31 provided in this application can effectively dock with the cathode head 21 to effectively shield the cathode middle section 22, preventing the cathode middle section 22 from being contaminated by intruding oil or water, which would affect the stability and safety of conductivity. The insulating cover 31 provided in this application can also effectively seal the upper opening of the insulator mounting sleeve 41 to prevent oil or water that may exist in the plasma generation chamber from entering the insulator mounting sleeve 41, ensuring the effectiveness of internal isolation. The insulator 32 provided in this application is designed as a pipe section structure that facilitates insertion and stacking, thereby making it easy to assemble according to actual length requirements, improving the convenience and efficiency of disassembly and maintenance. Furthermore, since the insulator 32 made of insulating ceramic material is prone to breakage and other damage that affects the insulation effect, the pipe section insulator 32 can be easily replaced, reducing replacement costs and maintenance difficulty.
[0036] Preferably, a shielding ring plate 311 is also provided on the main body of the insulating cover 31 to seal the axial upper opening of the insulator mounting sleeve 14, so that the insulating cover 31 is fastened to the top opening of the insulator mounting sleeve 14, thereby sealing the top opening of the insulator mounting sleeve 14 to prevent dirt, debris, etc. from entering the insulator mounting sleeve 14 and affecting the insulation isolation effect. Preferably, the lower surface of the shielding ring plate 311 is provided with an inserting ring groove 312 that matches the cross-section of the insulator mounting sleeve 14. More preferably, a polytetrafluoroethylene gasket is also provided in the inserting ring groove 312 to effectively fill the assembly gap, thereby effectively preventing the intrusion of moisture and other substances and improving the isolation effect.
[0037] Preferably, the purging assembly 4 includes a purging line 41, a purging line connecting flange 42, and a purging fan 43. Preferably, the purging line 41 is mounted on the outer surface of the insulator mounting sleeve 14, and its axial upper end is inserted into the anode front cone 11 through the through mounting hole 111. Preferably, the axial lower end of the purging line 41 is connected to the purging fan 43, which can supply purging airflow to it, through the purging line connecting flange 42. Preferably, the purging fan 43 can be an axial flow fan of model MW-HF-TPR4C. Preferably, the outer side of the purging fan 43 is also wrapped with a heat insulation layer 44 to prevent frost condensation caused by cold air at high altitudes from corroding its body. Preferably, an insulating sleeve layer 411 is also provided on the tube body of the purging line 41 to isolate it from the anode front cone 11. The insulating sleeve layer 411 can isolate the tube body of the purging line 41 from the anode front cone 11. The purge fan 43 provided in this application can continuously supply clean gases such as argon and nitrogen or conventional air to the purge line 41, allowing the output airflow to effectively pass through the inner cavity of the anode front cone 11. Furthermore, this airflow can be directionally discharged upwards from the opening at the top of the anode front cone 11, effectively preventing oil, water, mud, rain, snow, and other contaminants in the polluting gas from falling into the plasma generation chamber through the top opening of the anode front cone 11 during plasma ignition. This ensures the cleanliness of the plasma generation chamber during the ionization process, guaranteeing the stability and reliability of plasma ignition. In addition, the airflow output from the purge line 41 can effectively guide the plasma to move in a directional direction, thereby forming a continuously output dynamic plasma flow at the top opening of the anode front cone 11, thus achieving the stability and continuity of the ignition flame. Finally, the airflow can also create a local negative pressure in the cone 11 at the front end of the anode, thereby driving the external cold air to be quickly drawn in from the drain hole 121 on the bottom surface of the anode rear end seat 12. This accelerates the gas replacement in the plasma generation chamber, enabling the plasma generation chamber to dissipate heat quickly and effectively through air exchange. This effectively transfers the heat generated during ionization in the plasma generation chamber, reduces the working temperature in the chamber, and improves the stability of the ionized plasma.
[0038] Preferably, the electrical components such as the blower 43 are electrically connected to the controller and the power supply. The control method of this application is controlled by the controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this utility model is only used to protect the mechanical device and its mechanical structural features. Therefore, this utility model will not explain the control method and circuit connection in detail.
[0039] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.
Claims
1. A self-cleaning plasma generator for plasma ignition of combustible media, comprising an anode assembly (1) and a cathode assembly (2) that cooperate to generate plasma, characterized in that, The cathode assembly (2) is detachably inserted into the anode assembly (1), and an insulating assembly (3) is provided between the anode assembly (1) and the cathode assembly (2) to isolate the cathode and anode by wrapping the cathode assembly (2) against contamination. A purging assembly (4) is provided on the outside of the anode assembly (1) to be inserted into the plasma generation chamber defined by the anode assembly (1) to perform airflow purging and cleaning of the chamber space and to guide the directional flow of plasma.
2. A self-cleaning plasma igniter for combustible medium plasma ignition according to claim 1, characterized in that, The anode front cone (11) of the anode assembly (1) is fitted onto the top port of the anode rear seat (12) in a manner that defines the plasma generation chamber; An insulating mounting sleeve (14) for limiting and accommodating the cathode assembly (2) and the insulating assembly (3) is inserted into the lower end face of the anode rear end seat (12).
3. A self-cleaning plasma igniter for combustible medium plasma ignition as claimed in claim 2, wherein, Drainage holes (121) are provided circumferentially at intervals on the bottom surface of the anode rear end seat (12) in a manner that surrounds the insulator mounting sleeve (14).
4. The self-cleaning plasma torch for igniting a combustible medium according to claim 3, characterized in that, The cathode assembly (2) includes a cathode head (21), a cathode middle section (22), and a cathode locking nut (23), wherein, The cathode middle section (22) is inserted into the bottom of the cathode head (21), and the lower axial end of the cathode middle section (22) is connected to a cathode locking nut (23) that defines the mounting position of the insulating component (3) on the cathode middle section (22).
5. A self-cleaning plasma igniter for combustible medium plasma ignition as claimed in claim 4, wherein, The cathode head (21) has a central vertical hole (211) at the bottom for inserting the cathode middle section (22) and an extended vertical hole (212) for accommodating part of the insulating component (3).
6. The self-cleaning plasma generator for ignition of combustible media as described in claim 5, characterized in that, The bottom edge of the cathode head (21) is also provided with an outward-facing horn ring (213) that can guide the sewage entering the plasma generation chamber and shield the assembly gap.
7. A self-cleaning plasma igniter for combustible medium plasma ignition as claimed in claim 6, wherein, An insulator locking nut (15) is provided on the bottom side of the inner cavity of the insulator mounting sleeve (14) to adjustably define the working position of the insulating component (3) inside it.
8. The self-cleaning plasma generator for ignition of combustible media as described in claim 7, characterized in that, The insulating assembly (3) includes an insulating cover (31) and an insulator (32), wherein, A plurality of the insulators (32) are stacked in a plug-in manner to form an insulating isolation sleeve that can separate the insulator mounting sleeve (14) from the cathode middle section (22), and the top of the insulating isolation sleeve assembled by the insulators (32) is fitted with an insulating cover (31) that can be inserted into the extended vertical hole (212) and connected to the cathode head (21).
9. The self-cleaning plasma torch for igniting a combustible medium plasma according to claim 8, characterized in that, A shielding ring plate (311) is also provided on the main body of the insulating cover (31) to block the axial upper opening of the insulating mounting sleeve (14).
10. The self-cleaning plasma torch for igniting a combustible medium according to claim 9, characterized in that, The purging assembly (4) includes a purging pipeline (41), a purging pipeline connecting flange (42), and a purging blower (43), wherein, The purge line (41) is installed on the outer side of the insulator mounting sleeve (14), and the lower axial end of the purge line (41) is connected to the purge fan (43) through the purge line connecting flange (42).