plasma generator

Abstract

This invention discloses a plasma generator, including a rear electrode assembly and an output electrode assembly. The output electrode assembly includes an output electrode connected to the rear electrode assembly. The inner cavity of the output electrode includes a first compression section, a throat straight section, and a first expansion section connected sequentially at their ends along the medium flow direction. Along the medium flow direction: the cross-sectional area of ​​the first compression section gradually decreases, the cross-sectional area of ​​the throat straight section remains constant, and the cross-sectional area of ​​the first expansion section gradually increases. In the plasma generator provided in this application, by first compressing and then expanding the medium within the inner cavity of the output electrode, under the same power conditions, the electrode ablation rate is reduced by increasing the arc voltage and decreasing the operating current. Therefore, the service life of the plasma generator provided in this application is extended.

Description

Technical Field

[0001] This invention relates to the field of plasma technology, and in particular to a plasma generator. Background Technology

[0002] A plasma generator is a device that generates plasma artificially. A DC arc plasma generator can produce a high-temperature thermal plasma jet, which is not only high in temperature but also highly reactive. Therefore, it has been successfully applied in areas such as pulverized coal ignition, material surface treatment, material thermal processing, and waste treatment. However, the application of high-power plasma generators is limited by the short lifespan of the electrodes, hindering their widespread adoption.

[0003] Currently, high-power plasma generators generally adopt a tubular structure. By increasing the arc spot area and reducing the current density, the electrode ablation rate is reduced. Commonly used tubular plasma generators employ a tubular or near-tubular structure, achieving high power output by increasing the operating current. This approach increases the arc current density and electrode ablation rate, resulting in shorter electrode life and a shorter overall lifespan for the plasma generator.

[0004] Therefore, how to improve the operational stability of plasma generators is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a plasma generator with improved operational stability.

[0006] To achieve the above objectives, the present invention provides a plasma generator, including a rear electrode assembly and an output electrode assembly. The output electrode assembly includes an output electrode connected to the rear electrode assembly. The inner cavity of the output electrode includes a first compression section, a throat straight section, and a first expansion section connected sequentially at their ends along the medium flow direction.

[0007] Along the direction of medium flow: the intercepting area of ​​the first compression section gradually decreases, the intercepting area of ​​the straight throat section is the same, and the intercepting area of ​​the first expansion section gradually increases.

[0008] Optionally, in the plasma generator described above, the inner cavity of the output electrode further includes an inlet straight section that connects the second compression section and the outlet of the second compression section and the inlet of the first compression section. Along the direction of medium flow, the cross-sectional area of ​​the second compression section gradually decreases, while the cross-sectional area of ​​the inlet straight section remains the same.

[0009] Optionally, in the plasma generator described above, the inner cavity of the output electrode further includes an inlet connected to the outlet of the first expansion section and a second expansion section. Along the direction of medium flow, the cross-sectional area of ​​the second expansion section gradually increases, and the expansion angle of the first expansion section is smaller than that of the second expansion section.

[0010] Optionally, the plasma generator further includes a generator housing connected to the positive terminal of a DC power supply. The rear electrode assembly includes a rear electrode connected to the negative terminal of the DC power supply. The generator housing is provided with an output electrode cooling medium inlet, an output electrode cooling medium outlet, and a main air inlet for supplying working medium to the output electrode. The output electrode assembly further includes a water-proof sleeve, an outer water sleeve, and a base. One end of the output electrode is connected to the base. The water-proof sleeve is fitted outside the output electrode, with one end connected to the base and the other end connected to the output electrode. The outer water sleeve is fitted outside the water-proof sleeve, with one end connected to the base and the other end connected to the output electrode. A water inlet channel is formed between the water-proof sleeve and the output electrode, and a water return channel is formed between the water-proof sleeve and the outer water sleeve. Along the cooling medium flow direction, the output electrode cooling medium inlet, the water inlet channel, the water return channel, and the output electrode cooling medium outlet are sequentially connected.

[0011] Optionally, the plasma generator described above also includes heat dissipation fins disposed on the outer peripheral surface of the output electrode. The heat dissipation fins include a plurality of fins, and cooling medium flow channels are formed between adjacent heat dissipation fins.

[0012] Optionally, in the plasma generator described above, the heat dissipation fins are disposed near the nozzle of the output electrode, along the flow direction of the cooling medium, and the inlet end of the heat dissipation fins is inclined from the output electrode toward the water-proof sleeve.

[0013] Optionally, the plasma generator described above also includes a swirling element, which connects the water-proof sleeve to the base and connects the cooling medium inlet of the output electrode to the water inlet channel. The swirling element is sleeved on the outside of the output electrode, and the swirling element has swirling cavities arranged at equal intervals along the circumferential direction for fluid to swirl into the inner cavity of the swirling element.

[0014] Optionally, the plasma generator described above further includes a first air ring disposed at the working medium inlet end of the output electrode. The first air ring is integrally formed with the base, and the first air ring is provided with air inlet holes, which are uniformly distributed along the circumference of the first air ring.

[0015] Optionally, the plasma generator further includes a first support ring, a second support ring, and a ring insulating cylinder. The rear electrode assembly is slidably separated from the generator housing on the side away from the output electrode. The first support ring is sleeved on the outside of the first end of the rear electrode and located inside the generator housing. The rear electrode assembly further includes:

[0016] A rear electrode base is connected to the second end of the rear electrode. The first end and the second end of the rear electrode are opposite ends of the flow direction of the working medium in the inner cavity of the rear electrode. An auxiliary air inlet is provided inside the rear electrode base for conveying the working medium into the inner cavity of the rear electrode.

[0017] The rear electrode gun body has a rear electrode base connected to the rear electrode gun body at the end away from the rear electrode. The rear electrode gun body is sleeved on the outside of the rear electrode base, and a cavity for the flow of cooling medium is formed between the rear electrode gun body and the rear electrode base.

[0018] The rear electrode conduit has one end connected to the rear electrode gun body and the other end connected to the first support ring. The rear electrode conduit is sleeved on the outside of the rear electrode. The insulating cylinder is sleeved on the outside of the rear electrode conduit. One end of the insulating cylinder is connected to the first support ring and the other end is connected to the second support ring. The end of the generator housing away from the output electrode assembly is connected to the second support ring.

[0019] Optionally, the plasma generator described above further includes a first air ring disposed at the working medium inlet end of the output electrode. The first air ring is integrally formed with the first support ring, and the first air ring is provided with air inlet holes, which are uniformly distributed along the circumference of the first air ring.

[0020] Optionally, in the plasma generator described above, the rear electrode has a blind-hole tubular structure at the bottom end near the rear electrode base, and a through hole connecting the rear electrode base and the inner cavity of the rear electrode is installed on the side wall of the bottom end of the rear electrode. The bottom of the inner cavity of the rear electrode is a convex conical shape.

[0021] Optionally, the plasma generator described above also includes a second air ring arranged at the bottom of the rear electrode. The second air ring is arranged circumferentially for an air inlet for gas to swirl into the inner cavity of the second air ring. The second air ring is connected to the through hole of the rear electrode.

[0022] The rear electrode base is provided with a vent hole inside. The diameter of the vent hole inlet end is smaller than the diameter of the vent hole outlet end. The vent hole is sleeved on the outer circumference of the second air ring. The diameter of the vent hole outlet end is larger than the outer diameter of the second air ring.

[0023] In the above technical solution, the plasma generator provided by the present invention includes a rear electrode assembly and an output electrode assembly. The output electrode assembly includes an output electrode connected to the rear electrode assembly. The inner cavity of the output electrode includes a first compression section, a throat straight section, and a first expansion section connected sequentially at their ends along the medium flow direction. Along the medium flow direction: the cross-sectional area of ​​the first compression section gradually decreases, the cross-sectional area of ​​the throat straight section remains the same, and the cross-sectional area of ​​the first expansion section gradually increases.

[0024] As can be seen from the above description, in the plasma generator provided in this application, the medium is first compressed and then expanded in the inner cavity of the output electrode. Under the same power conditions, the electrode ablation rate is reduced by increasing the arc voltage and decreasing the operating current. Therefore, the service life of the plasma generator provided in this application is extended. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is an external view of the plasma generator provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the output electrode assembly provided in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A schematic diagram of a wind ring structure along the AA direction;

[0029] Figure 4 for Figure 2 A schematic diagram of the structure of the water tank along the BB direction;

[0030] Figure 5 This is a schematic diagram of the structure of the first air ring provided in another embodiment of the present invention;

[0031] Figure 6 This is a structural view of the plasma generator provided in an embodiment of the present invention.

[0032] in Figure 1-6 middle:

[0033] 100. Generator housing;

[0034] 101. Output electrode assembly; 1011. Output electrode; 1011A. Second compression section; 1011B. Inlet straight section; 1011C. First compression section; 1011D. Throat straight section; 1011E. First expansion section; 1011F. Second expansion section; 1012. Water-proof sleeve; 1013. Outer water sleeve; 1014. Base;

[0035] 102. Rear electrode assembly; 1021. Rear electrode; 1022. Rear electrode base; 1023. Rear electrode gun body; 1024. Rear electrode conduit;

[0036] 103. First support ring;

[0037] 104. Second support ring;

[0038] 105; Insulating cylinder;

[0039] 201. Rear electrode cooling medium inlet; 202. Rear electrode cooling medium outlet; 203. Output electrode cooling medium inlet; 204. Output electrode cooling medium outlet;

[0040] 301. Main air intake; 302. Auxiliary air intake;

[0041] 401. First wind ring;

[0042] 402. Second wind ring;

[0043] 501. Heat dissipation fins;

[0044] 502. Swirl component. Detailed Implementation

[0045] The core of this invention is to provide a plasma generator with an extended service life.

[0046] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Please refer to Figures 1 to 6 .

[0048] In one specific embodiment, the plasma generator provided by this invention includes a rear electrode assembly 102 and an output electrode assembly 101. The output electrode assembly 101 includes an output electrode 1011 connected to the rear electrode assembly 102. The inner cavity of the output electrode 1011 includes a first compression section 1011C, a throat straight section 1011D, and a first expansion section 1011E along the medium flow direction. Along the medium flow direction: the cross-sectional area of ​​the first compression section 1011C gradually decreases, the cross-sectional area of ​​the throat straight section 1011D is the same, and the cross-sectional area of ​​the first expansion section 1011E gradually increases. Preferably, the inner surface of at least one of the first compression section 1011C and the first expansion section 1011E is a conical surface.

[0049] The rear electrode assembly 102 includes a rear electrode 1021. The main cavity connecting the rear electrode 1021 and the output electrode 1011 can be a cavity with the same cross-sectional area, specifically a cylindrical cavity.

[0050] As can be seen from the above description, the plasma generator provided in the specific embodiment of this application can generate a plasma jet with high enthalpy and long and thick flame. The medium is first compressed and then expanded in the inner cavity of the output electrode 1011. Under the same power conditions, by increasing the arc voltage and reducing the operating current, the electrode ablation rate is reduced. Therefore, the service life of the plasma generator provided in this application is extended.

[0051] In one specific embodiment, the inner cavity of the output electrode 1011 further includes an inlet straight section 1011B that connects the second compression section 1011A and the outlet of the second compression section 1011A and the inlet of the first compression section 1011C. Along the medium flow direction, the cross-sectional area of ​​the second compression section 1011A gradually decreases, while the cross-sectional area of ​​the inlet straight section 1011B remains the same.

[0052] The inner cavity of the output electrode 1011 also includes an inlet and a second expansion section 1011F connected to the outlet of the first expansion section 1011E. Along the direction of medium flow, the cross-sectional area of ​​the second expansion section 1011F gradually increases. The expansion angle of the first expansion section 1011E is smaller than the expansion angle of the second expansion section 1011F, where the expansion angle is the direction between the inner walls of the first and second expansion sections 1011E and the axis of the output electrode 1011. The expansion angle α1 of the first expansion section 1011E is smaller than the expansion angle α2 of the second expansion section 1011F.

[0053] like Figure 2 As shown, preferably, the second expansion segment 1011F adopts a rounded chamfer.

[0054] When the inlet straight section 1011B and the throat straight section 1011D are uniform cylindrical structures, the inner diameter d1 of the inlet straight section 1011B is greater than the inner diameter d0 of the throat straight section 1011D.

[0055] In one specific embodiment, the plasma generator further includes a generator housing 100, which is connected to the positive terminal of a DC power supply, and the rear electrode assembly 102 is connected to the negative terminal of the DC power supply. The generator housing 100 is provided with a cooling medium inlet for the output electrode 1011, a cooling medium outlet for the output electrode 1011, and a main air inlet 301 for supplying working medium to the output electrode 1011.

[0056] The output electrode assembly 101 also includes a water-isolating sleeve 1012, an outer water sleeve 1013, and a base 1014. One end of the output electrode 1011 is connected to the base 1014. The water-isolating sleeve 1012 is fitted on the outside of the output electrode 1011. One end of the water-isolating sleeve 1012 is connected to the base 1014, and the other end of the water-isolating sleeve 1012 is connected to the output electrode 1011. The outer water sleeve 1013 is fitted on the outside of the water-isolating sleeve 1012. One end of the outer water sleeve 1013 is connected to the base 1014, and the other end of the outer water sleeve 1013 is connected to the output electrode 1011. The space between the water-isolating sleeve 1012 and the output electrode 1011 forms a water inlet channel, and the space between the water-isolating sleeve 1012 and the outer water sleeve 1013 forms a water return channel. Along the cooling medium flow direction, the output electrode 1011 cooling medium inlet, water inlet channel, water return channel, and output electrode cooling medium outlet 204 are sequentially connected. Specifically, the inlet end face of the output electrode 1011 is flush with the end face of the base 1014.

[0057] In specific assembly, preferably, the base 1014 is connected to the generator housing 100 by bolts. The outlet end face of the generator housing 100 has oblong holes at opposite ends, for example, on the left and right, which correspond to the oblong holes on the inlet end face of the base 1014, allowing the cooling medium to flow into and out of the output electrode assembly 101. Specifically, a circular groove is formed at the bottom of the oblong hole in the base 1014, connecting the oblong hole to the central hole of the base 1014, thus enabling the flow of the cooling medium.

[0058] To provide heat dissipation, the plasma generator preferably includes heat dissipation fins 501 disposed on the outer peripheral surface of the output electrode 1011. Multiple heat dissipation fins 501 are included, and cooling medium flow channels are formed between adjacent heat dissipation fins 501. Preferably, the heat dissipation fins 501 are disposed near the nozzle of the output electrode 1011. Specifically, the heat dissipation fins 501 have a trapezoidal structure, with the long side being a trapezoidal fin structure, and a trapezoidal fin structure is disposed on the outer side of the rear electrode 1021. Figure 6 As shown, along the flow direction of the cooling medium, the inlet end of the heat dissipation fins 501 is inclined from the output electrode 1011 toward the water-proof sleeve 1012. Heat dissipation fins 501 are arranged on the outside of the output electrode 1011 to enhance cooling.

[0059] To ensure stable flow of the cooling medium, it is preferable that adjacent heat dissipation fins 501 are spaced at equal intervals.

[0060] In one specific embodiment, the plasma generator further includes a swirling element 502, which connects the water-proof sleeve 1012 to the base 1014 and connects the cooling medium inlet of the output electrode 1011 to the water inlet channel. The swirling element 502 is sleeved on the outside of the output electrode 1011, and the swirling element 502 has swirling cavities arranged at equal intervals along the circumferential direction to allow fluid to swirl into the inner cavity of the swirling element 502. The swirling structure has 8 to 12 swirling cavities arranged at equal intervals along the circumferential direction. Specifically, the water-proof sleeve 1012 is connected to the base 1014. Specifically, the swirling cavity can be a swirling groove or swirling hole formed on the swirling element 502, connecting the outer wall and the inner wall to form a flow cavity.

[0061] Specifically, the plasma generator also includes a first air ring 401 disposed at the working medium inlet end of the electrode assembly, which can be arranged on the output electrode 1011. The first air ring 401 is provided with air inlets, which are evenly distributed circumferentially along the first air ring 401. The first air ring 401 is integrally formed with the base 1014. Specifically, the first air ring 401 is arranged at one end of the base 1014 near the rear electrode assembly 102. The working medium enters the output electrode 1011 and the rear electrode 1021 through the first air ring 401 in a tangential rotation. The first air ring 401 has 6 to 18 air inlets evenly spaced along the circumferential direction. The air inlets are used for gas swirling into the inner cavity of the first air ring. The shape of the air inlets is consistent, such as... Figure 5 As shown, the air intake can adopt a circular hole structure. Figure 3 As shown, the air inlet can also adopt a slot-shaped structure, for example, it can be directly opened at the end of the output electrode 1011.

[0062] The plasma generator provided in this application also includes a rear electrode assembly 102 and a first support ring 103. A first air ring 401 can be arranged at one end of the first support ring 103 near the output electrode 1011. The rear electrode 1021 is disconnected from the output electrode 1011 via the first support ring 103. Preferably, the first air ring 401 and the first support ring 103 are integrally formed. The rear electrode assembly 102 can slide away from the generator housing 100 on the side away from the output electrode 1011, meaning that when the rear electrode assembly 102 needs to be disassembled, it is not necessary to first remove the output electrode assembly 101, facilitating the disassembly of the rear electrode assembly 102.

[0063] The rear electrode assembly 102 also includes a rear electrode base 1022, a rear electrode gun body 1023 and a rear electrode conduit 1024. The first end of the rear electrode 1021 is connected to the output electrode 1011. The first support ring 103 is sleeved on the outside of the first end of the rear electrode 1021 and is located inside the generator housing 100. Specifically, the inlet end face of the rear electrode 1021 adopts a rounded chamfer.

[0064] The rear electrode 1021 has a blind-hole tubular structure at its bottom end near the rear electrode base 1022. A through hole connecting the rear electrode base 1022 and the inner cavity of the rear electrode 1021 is installed on the side wall of the bottom end of the rear electrode 1021. The bottom of the inner cavity of the rear electrode 1021 is a convex cone shape, and the inner diameter d2 of the rear electrode 1021 is larger than the inner diameter d1 of the straight section 1011B at the inlet of the output electrode 1011.

[0065] To improve the heat dissipation effect of the rear electrode 1021, preferably, a fin structure for enhanced cooling is arranged on the outer side of the rear electrode 1021.

[0066] The rear electrode base 1022 is connected to the second end of the rear electrode 1021. The first end and the second end of the rear electrode 1021 are opposite ends of the flow direction of the working medium in the inner cavity of the rear electrode 1021. The rear electrode base 1022 is provided with an auxiliary air inlet 302 for conveying the working medium into the inner cavity of the rear electrode 1021.

[0067] The rear electrode base 1022 is connected to the rear electrode gun body 1023 at the end away from the rear electrode 1021. The rear electrode gun body 1023 is sleeved on the outside of the rear electrode base 1022, and a cavity for the flow of cooling medium is formed between the rear electrode gun body 1023 and the rear electrode base 1022.

[0068] One end of the rear electrode conduit 1024 is connected to the rear electrode gun body 1023, and the other end of the rear electrode conduit 1024 is connected to the first support ring 103. The rear electrode conduit 1024 is sleeved on the outside of the rear electrode 1021. The rear electrode assembly 102 is provided with a rear electrode cooling medium inlet 201, a rear electrode cooling medium outlet 202, and an auxiliary air inlet 302, wherein the auxiliary air inlet 302 is used for the entry of the working medium.

[0069] A second air ring 402 is arranged at the bottom of the rear electrode 1021. The working medium enters the rear electrode assembly 102 through the second air ring 402 in a tangential rotation. The rear electrode 1021 adopts a tubular blind hole structure, and the bottom of the rear electrode 1021 is conical. One end of the bottom of the rear electrode 1021 is connected to the rear electrode base 1022, and the other end of the rear electrode base 1022 is connected to the rear electrode gun body 1023. One end of the rear electrode conduit 1024 is connected to the rear electrode gun body 1023, and the rear electrode conduit 1024 is arranged on the outside of the rear electrode 1021. A vent is provided inside the rear electrode base 1022. Preferably, the diameter of the vent inlet end is smaller than the diameter of the outlet end, and the diameter of the vent outlet end is larger than the outer diameter of the second air ring 402.

[0070] Ventilation holes are provided inside the rear electrode base 1022. The diameter of the inlet end of the ventilation hole is smaller than the diameter of the outlet end, and the diameter of the outlet end of the ventilation hole is larger than the outer diameter of the second air ring 402.

[0071] The plasma generator also includes a second support ring 104 and an insulating ring 105 sleeved on the outside of the rear electrode conduit 1024. The insulating ring 105 is arranged between the generator housing 100 and the rear electrode assembly 102. The second support ring 104 is sleeved on the outside of the rear electrode conduit 1024. One end of the insulating ring 105 is connected to the first support ring 103, and the other end of the insulating ring 105 is connected to the second support ring 104. The end of the generator housing 100 away from the output electrode assembly 101 is connected to the second support ring 104.

[0072] The plasma generator also includes a second air ring 402 located at the bottom of the rear electrode 1021. The second air ring 402 has air inlets arranged circumferentially for gas to swirl into the inner cavity of the second air ring 402. The second air ring 402 has 4 to 10 air inlets arranged at equal intervals circumferentially, and the air inlets have the same shape and adopt a circular hole structure.

[0073] The rear electrode gun body 1023 is provided with an inlet for the rear electrode cooling medium and an outlet for the rear electrode cooling medium. The rear end of the rear electrode base 1022 is provided with an auxiliary air inlet 302, and the rear part of the generator housing 100 is provided with a main air inlet 301.

[0074] The rear electrode 1021 and the output electrode 1011 are made of materials with good electrical conductivity and strong thermal conductivity, such as copper, oxygen-free copper, copper alloy or silver alloy.

[0075] The plasma generator provided in this application has a simple structure and uses a single output electrode 1011, which can significantly increase the arc voltage. Under the same power conditions, by increasing the arc voltage and reducing the operating current, the electrode ablation rate is reduced. Simultaneously, the addition of swirling flow and fin structures on the outer side of the electrode significantly increases the heat exchange effect, thereby extending the electrode's service life. The rear electrode assembly 102 provided in this application has stable and reliable axial positioning, ensuring that the arc-starting gap between the rear electrode 1021 and the output electrode 1011 is controllable, significantly improving the generator's start-up success rate, and greatly simplifying the electrode replacement operation.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plasma generator, characterized by, The electrode assembly includes a rear electrode assembly (102) and an output electrode assembly (101), the output electrode assembly (101) includes an output electrode (1011) in communication with the rear electrode assembly (102), and the inner cavity of the output electrode (1011) includes a first compression section (1011C), a throat straight section (1011D) and a first expansion section (1011E) in sequence along the medium flow direction. Along the medium flow direction, the cross-sectional area of the first compression section (1011C) gradually decreases, the cross-sectional area of the throat straight section (1011D) is the same, and the cross-sectional area of the first expansion section (1011E) gradually increases. Under the condition of the same power, the arc voltage is improved, the operating current is reduced, and the purpose of reducing the electrode ablation rate is achieved. The inner cavity of the output electrode (1011) includes an inlet and a second expansion section (1011F) connected with the outlet of the first expansion section (1011E), along the medium flow direction, the cross-sectional area of the second expansion section (1011F) gradually increases, and the expansion angle of the first expansion section (1011E) is smaller than that of the second expansion section (1011F). The output electrode assembly (101) further includes a water jacket (1012), an outer water jacket (1013) and a base (1014), and the space between the water jacket (1012) and the output electrode (1011) forms a water inlet channel. It also includes a plurality of heat dissipation fins (501) arranged on the outer circumferential surface of the output electrode (1011), and the cooling medium flow channel is formed between adjacent heat dissipation fins (501). It also includes a cyclone member (502) connected between the water jacket (1012) and the base (1014), and the cooling medium inlet of the output electrode (1011) is in communication with the water inlet channel, the cyclone member (502) is arranged outside the output electrode (1011), and the cyclone member (502) is arranged at equal intervals in the circumferential direction for fluid rotation into the inner cavity of the cyclone member (502).

2. The plasma generator of claim 1, wherein, The inner cavity of the output electrode (1011) further includes a second compression section (1011A) and an inlet straight section (1011B) connected with the outlet of the second compression section (1011A) and the inlet of the first compression section (1011C), along the medium flow direction, the cross-sectional area of the second compression section (1011A) gradually decreases, and the cross-sectional area of the inlet straight section (1011B) is the same.

3. The plasma generator of claim 1 or 2, wherein, The generator shell (100) is connected with the positive pole of the direct current power supply, the rear electrode assembly (102) comprises a rear electrode (1021) connected with the negative pole of the direct current power supply, the generator shell (100) is provided with an output electrode (1011) cooling medium inlet, an output electrode (1011) cooling medium outlet and a main air inlet (301) for delivering working medium to the output electrode (1011), one end of the output electrode (1011) is connected with the base (1014), the water jacket (1012) is sleeved outside the output electrode (1011), one end of the water jacket (1012) is connected with the base (1014), and the other end of the water jacket (1012) is connected with the output electrode (1011); the outer water jacket (1013) is sleeved outside the water jacket (1012), one end of the outer water jacket (1013) is connected with the base (1014), and the other end of the outer water jacket (1013) is connected with the output electrode (1011); a water return flow channel is arranged between the water jacket (1012) and the outer water jacket (1013), and the output electrode (1011) cooling medium inlet, the water inlet flow channel, the water return flow channel and the output electrode (1011) cooling medium outlet are sequentially connected in the cooling medium flow direction.

4. The plasma generator of claim 3, wherein, The heat dissipation fin (501) is arranged at the output electrode (1011) close to the nozzle, and the inlet end of the heat dissipation fin (501) is arranged obliquely from the output electrode (1011) to the position of the water jacket (1012) in the cooling medium flow direction.

5. The plasma generator of claim 3, wherein, The first air ring (401) is arranged at the working medium inlet end of the output electrode (1011), the first air ring (401) is integrally formed with the base (1014), the first air ring (401) is provided with air inlet holes, and the air inlet holes are uniformly distributed in the circumferential direction of the first air ring (401).

6. The plasma generator of claim 3, wherein, The first support ring (103), the second support ring (104) and the ring insulation cylinder (105) are further included, the rear electrode assembly (102) can be separated from the generator shell (100) by sliding away from the side of the output electrode (1011), the first support ring (103) is sleeved outside the first end of the rear electrode (1021) and located inside the generator shell (100), and the rear electrode assembly (102) further comprises: The rear electrode base (1022) is connected with the second end of the rear electrode (1021), the first end and the second end of the rear electrode (1021) are opposite ends of the working medium flow direction in the inner cavity of the rear electrode (1021), the rear electrode base (1022) is provided with an auxiliary air inlet (302) for delivering working medium to the inner cavity of the rear electrode (1021) inside the rear electrode base (1022), a rear electrode gun body (1023) connected with the rear electrode base (1022) at an end away from the rear electrode (1021), the rear electrode gun body (1023) being sleeved outside the rear electrode base (1022), and a cavity for cooling medium flow being formed between the rear electrode gun body (1023) and the rear electrode base (1022); and a rear electrode conduit (1024) connected with the rear electrode gun body (1023) at one end and connected with the first support ring (103) at the other end, the rear electrode conduit (1024) being sleeved outside the rear electrode (1021), the insulating cylinder (105) being sleeved outside the rear electrode conduit (1024), the insulating cylinder (105) being connected with the first support ring (103) at one end and connected with the second support ring (104) at the other end, and the generator housing (100) being connected with the second support ring (104) at an end away from the output electrode assembly (101).

7. The plasma generator of claim 6, wherein, The first air ring (401) is arranged at the working medium inlet end of the output electrode (1011), the first air ring (401) is integrally formed with the first support ring (103), the first air ring (401) is provided with air inlet holes, and the air inlet holes are uniformly distributed in the circumferential direction of the first air ring (401).

8. The plasma generator of claim 6, wherein, The rear electrode (1021) is a blind hole tubular structure at an end close to the rear electrode base (1022), a through hole is mounted on the side wall of the bottom end of the rear electrode (1021) and communicates the rear electrode base (1022) with the inner cavity of the rear electrode (1021), and the bottom of the inner cavity of the rear electrode (1021) is in a convex conical shape.

9. The plasma generator of claim 8, wherein, The second air ring (402) is arranged at the bottom of the rear electrode (1021), the second air ring (402) is arranged in the circumferential direction, and the air inlet holes of the second air ring (402) are used for gas cyclone to enter the inner cavity of the second air ring, and the second air ring (402) is connected with the through hole of the rear electrode (1021); The rear electrode base (1022) is provided with a vent hole, the diameter of the inlet end of the vent hole is smaller than the diameter of the outlet end of the vent hole, the vent hole is sleeved outside the second air ring (402), and the diameter of the outlet end of the vent hole is greater than the outer diameter of the second air ring (402).

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