Plasma generator

Abstract

The plasma generator comprises a shell, a first electrode assembly, a second electrode assembly and a rotational flow ring, and the shell is provided with a cooling liquid inlet flow channel, a cooling liquid outlet flow channel, a cooling liquid communicating flow channel and a working medium gas flow channel; the first electrode assembly and the second electrode assembly are arranged in the shell in a mutually insulated mode, and the first electrode assembly is provided with a first electrode cooling flow channel communicated with the cooling liquid inlet flow channel and the cooling liquid communication flow channel; an electric arc channel is formed in the second electrode assembly, the second electrode assembly is arranged outside the first electrode assembly in a sleeving mode, and the second electrode assembly is provided with a second electrode cooling flow channel communicating with the cooling liquid communicating flow channel and the cooling liquid outlet flow channel; the rotational flow ring is arranged between the working medium gas flow channel and the electric arc channel, the vent holes in the rotational flow ring are communicated with the working medium gas flow channel and the electric arc channel, the plasma generator can cool the electrode assembly, it is ensured that the internal temperature of the plasma generator is kept within a safe range, overheating damage is prevented, and the service life of an electrode is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma generation equipment, and particularly relates to a plasma generator. Background Art

[0002] Compared with traditional oil gun ignition, the plasma ignition method has the advantages of environmental protection, high efficiency, high degree of automation, and being more economical. Therefore, the plasma ignition method has been widely applied in fields such as coupled ignition, waste gas treatment, material treatment, and surface modification.

[0003] The plasma generator is one of the core devices of the plasma ignition device. Currently, the existing small-power plasma generators have a short electrode life, and the stability and uniformity of the generated plasma are not ideal enough. Summary of the Invention

[0004] The purpose of the present invention is to provide a plasma generator, so as to increase the service life of the electrode and improve the stability and uniformity of the generated plasma.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A plasma generator, comprising:

[0007] A housing, the housing is provided with a coolant inlet flow channel, a coolant outlet flow channel, a coolant communication flow channel, and a working gas flow channel;

[0008] A first electrode assembly, arranged in the housing, the first electrode assembly is provided with a first electrode cooling flow channel, the inlet end of the first electrode cooling flow channel is communicated with the coolant inlet flow channel, and the outlet end of the first electrode cooling flow channel is communicated with the inlet end of the coolant communication flow channel;

[0009] A second electrode assembly, arranged in the housing insulated from the first electrode assembly, the second electrode assembly is axially hollow inside to form an arc channel, and is sleeved outside the first electrode assembly, the second electrode assembly is provided with a second electrode cooling flow channel, the inlet end of the second electrode cooling flow channel is communicated with the outlet end of the coolant communication flow channel, and the outlet end of the second electrode cooling flow channel is communicated with the coolant outlet flow channel;

[0010] A swirl ring, arranged between the working gas flow channel and the arc channel, the swirl ring is circumferentially provided with a plurality of ventilation holes, the working gas flow channel and the arc channel are communicated through the ventilation holes, and the center line of the ventilation hole is inclined relative to the axis of the swirl ring and does not pass through the axis of the swirl ring.

[0011] In an embodiment of the present application, the housing includes an inner shell, an isolation layer, and an outer shell that are sequentially sleeved from the inside to the outside. The inner shell and the outer shell are insulated by the isolation layer. The first electrode assembly is disposed on the inner shell, the second electrode assembly is disposed on the outer shell, the coolant inlet flow channel is disposed on the inner shell, the coolant outlet flow channel and the working fluid gas flow channel are disposed on the outer shell, and the inner shell, the isolation layer, and the outer shell together define the coolant communication flow channel.

[0012] In an embodiment of the present application, the first electrode assembly includes a first electrode body and a cooling inner tube. The first electrode body is sleeved outside the first end of the cooling inner tube, and a first through-flow gap is formed between the inner wall surface of the first electrode body and the outer tube wall and the first end face of the cooling inner tube. The first through-flow gap communicates with the lumen of the cooling inner tube to form the first electrode cooling flow channel. The second end of the cooling inner tube serves as the inlet end of the first electrode cooling flow channel and communicates with the coolant inlet flow channel. One end of the first through-flow gap far from the first end of the cooling inner tube serves as the outlet end of the first electrode cooling flow channel and communicates with the inlet end of the coolant communication flow channel.

[0013] In an embodiment of the present application, an axial boss is provided on the inner end face of the first electrode body. The axial boss extends into the lumen of the cooling inner tube from the first end of the cooling inner tube, and an annular gap is formed between the circumferential wall surface of the axial boss and the lumen wall surface of the cooling inner tube.

[0014] In an embodiment of the present application, the outer wall surface of the end of the first electrode body far from the housing is a first arc-starting structure. The first arc-starting structure includes a columnar outer peripheral surface, a first conical surface, and an electrode end face that are sequentially connected in the order of the distance from the housing being from near to far. The first conical surface tapers from the end connected to the columnar outer peripheral surface.

[0015] In an embodiment of the present application, the second electrode assembly includes a second electrode body and a cooling outer sleeve. The interior of the second electrode body is axially hollow to form the arc channel. The cooling outer sleeve is sleeved outside the second electrode body. A second through-flow gap is formed between the cooling outer sleeve and the second electrode body. A third through-flow gap is provided inside the cooling outer sleeve. The end of the second through-flow gap far from the housing communicates with the end of the third through-flow gap far from the housing to form the second electrode cooling flow channel. The end of the second through-flow gap close to the housing serves as the inlet end of the second electrode cooling flow channel and communicates with the outlet end of the coolant communication flow channel. The end of the third through-flow gap close to the housing serves as the outlet end of the second electrode cooling flow channel and communicates with the coolant outlet flow channel.

[0016] In an embodiment of the present application, the cooling jacket includes an inner sleeve body and an outer sleeve body. The inner sleeve body is sleeved on the second electrode body, the outer sleeve body is sleeved outside the inner sleeve body, the gap between the inner sleeve body and the second electrode body is the second flow-through gap, and the gap between the outer sleeve body and the inner sleeve body is the third flow-through gap.

[0017] In an embodiment of the present application, the inner wall surface of one end of the arc channel close to the housing is a second arc starting structure. The second arc starting structure is sleeved outside the first arc starting structure. The second arc starting structure includes a first columnar inner peripheral surface, a second conical surface, and a second columnar inner peripheral surface that are sequentially connected in order of the distance from the housing being from near to far. The second conical surface tapers from the end connected to the first columnar inner peripheral surface.

[0018] In an embodiment of the present application, the inner wall surface of the arc channel further includes a third conical surface, a third columnar inner peripheral surface, a fourth conical surface, and a fourth columnar inner peripheral surface that are sequentially connected to one end of the second columnar inner peripheral surface far from the second conical surface in order of the distance from the housing being from near to far. The third conical surface tapers from the end connected to the second columnar inner peripheral surface, and the fourth conical surface expands from the end connected to the third columnar inner peripheral surface.

[0019] In an embodiment of the present application, the second electrode body includes an arc starting electrode and an output electrode. The arc starting electrode and the output electrode are detachably connected. The inner wall surface of one end of the arc starting electrode far from the output electrode is the second arc starting structure, and the inner wall surface of one end of the output electrode connected to the arc starting electrode is composed of the third conical surface, the third columnar inner peripheral surface, the fourth conical surface, and the fourth columnar inner peripheral surface.

[0020] As can be seen from the above technical solutions, a plasma generator is disclosed in the present invention. The plasma generator includes a housing, a first electrode assembly, a second electrode assembly, and a swirl ring. Among them, the housing is provided with a coolant inlet channel, a coolant outlet channel, a coolant communication channel, and a working gas channel; the first electrode assembly is disposed in the housing, and the first electrode assembly is provided with a first electrode cooling channel. The inlet end of the first electrode cooling channel is communicated with the coolant inlet channel, and the outlet end of the first electrode cooling channel is communicated with the inlet end of the coolant communication channel; the second electrode assembly is disposed in the housing insulated from the first electrode assembly. The second electrode assembly has an axially hollow interior to form an arc channel, and is sleeved outside the first electrode assembly. The second electrode assembly is provided with a second electrode cooling channel. The inlet end of the second electrode cooling channel is communicated with the outlet end of the coolant communication channel, and the outlet end of the second electrode cooling channel is communicated with the coolant outlet channel; the swirl ring is disposed between the working gas channel and the arc channel. The swirl ring is circumferentially provided with a plurality of vent holes. The working gas channel is communicated with the arc channel through the vent holes. The center line of the vent hole is inclined with respect to the axis of the swirl ring and does not pass through the axis of the swirl ring.

[0021] During application, the working gas enters the arc channel through the working gas channel and the swirl ring. Since the vent holes are inclined, the working gas forms a rotating gas flow field, which can make the distribution of the working gas in the arc channel more uniform, and also make the distribution of the subsequent generated plasma more uniform, thereby improving the stability and uniformity of the generated plasma. One of the first electrode assembly and the second electrode assembly is connected to the positive pole of the power supply, and the other is connected to the negative pole of the power supply, and a strong electric field is formed between them.

[0022] Under the action of the above strong electric field, gas molecules are excited to form high-energy plasma. At the same time, the coolant circulates through the coolant channel formed by connecting in series the coolant inlet channel, the coolant outlet channel, the coolant communication channel, the first electrode cooling channel, and the second electrode cooling channel driven by an external cooling device, and sequentially cools the first electrode assembly and the second electrode assembly to ensure that the internal temperature of the plasma generator is maintained within a safe range, prevent overheating damage, and increase the service life of the electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1The first axial sectional view of the plasma generator provided by the embodiment of the present invention;

[0025] Figure 2 The second axial sectional view of the plasma generator provided by the embodiment of the present invention;

[0026] Figure 3 The axial sectional view of the second electrode body of the plasma generator provided by an embodiment of the present invention;

[0027] Figure 4 The axial sectional view of the second electrode of the plasma generator provided by another embodiment of the present invention.

[0028] In the figure:

[0029] 100 is a housing; 110 is an inner housing; 120 is an isolation layer; 130 is an outer housing; 131 is a rear end cover; 132 is an outer sleeve; 133 is an inner sleeve; 134 is a front end cover; 100a is a coolant inlet flow channel; 100b is a coolant communication flow channel; 100c is a coolant outlet flow channel; 100d is a working fluid gas flow channel;

[0030] 200 is a first electrode assembly; 210 is a first electrode body; 211 is a columnar outer peripheral surface; 212 is a first conical surface; 213 is an electrode end face; 214 is an axial boss; 220 is a cooling inner tube; 200a is a first through-flow gap;

[0031] 300 is a second electrode assembly; 310 is a second electrode body; 311 is a first columnar inner peripheral surface; 312 is a second conical surface; 313 is a second columnar inner peripheral surface; 314 is a third conical surface; 315 is a third columnar inner peripheral surface; 316 is a fourth conical surface; 317 is a fourth columnar inner peripheral surface; 310a is a support boss; 310b is a limit boss; 310c is an ignition electrode; 310d is an output electrode; 320 is a cooling outer jacket; 321 is an inner sleeve body; 322 is an outer sleeve body; 300a is an arc channel; 300b is a second through-flow gap; 300c is a third through-flow gap;

[0032] 400 is a swirl ring. Specific embodiments

[0033] The core of the present invention is to provide a plasma generator, and the structural design of the plasma generator enables it to increase the service life of the electrodes and improve the stability and uniformity of the generated plasma.

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 and Figure 2 .

[0036] Disclosed in an embodiment of the present invention is a plasma generator, which includes a housing 100, a first electrode assembly 200, a second electrode assembly 300, and a swirl ring 400.

[0037] Among them, the housing 100 is provided with a coolant inlet flow channel 100a, a coolant outlet flow channel 100c, a coolant communication flow channel 100b, and a working gas flow channel 100d. The coolant inlet flow channel 100a and the coolant outlet flow channel 100c are used to connect with an external cooling device so that the coolant can enter and exit the plasma generator to form a cycle. The working gas flow channel 100d is used to supply working gas to the first electrode assembly 200 and the second electrode assembly 300. The working gas includes, but is not limited to, argon and air.

[0038] The first electrode assembly 200 is disposed in the housing 100. The first electrode assembly 200 is provided with a first electrode cooling flow channel. The inlet end of the first electrode cooling flow channel is communicated with the coolant inlet flow channel 100a, and the outlet end of the first electrode cooling flow channel is communicated with the inlet end of the coolant communication flow channel 100b to allow the coolant to flow through the inside of the first electrode assembly 200 to cool the first electrode assembly 200.

[0039] The second electrode assembly 300 is disposed in the housing 100 insulated from the first electrode assembly 200. The inside of the second electrode assembly 300 is axially hollow to form an arc channel 300a. One end of the arc channel 300a away from the housing 100 forms an opening for releasing the generated plasma. The second electrode assembly 300 is provided with a second electrode cooling flow channel. The inlet end of the second electrode cooling flow channel is communicated with the outlet end of the coolant communication flow channel 100b, and the outlet end of the second electrode cooling flow channel is communicated with the coolant outlet flow channel 100c to allow the coolant to flow through the inside of the second electrode assembly 300 to cool the second electrode assembly 300.

[0040] The swirl ring 400 is located inside the housing 100 and is disposed between the working fluid gas flow path 100d and the arc channel 300a. According to the structural design of the plasma generator, the swirl ring 400 can be fixed to the housing 100, or fixed between the first electrode assembly 200 and the second electrode assembly 300, or fixed between the first electrode assembly 200 and the housing 100, or fixed between the second electrode assembly 300 and the housing 100. No specific limitation is made here, as long as it is ensured that the working fluid gas flow path 100d is communicated with the arc channel 300a through the swirl ring 400.

[0041] The swirl ring 400 is circumferentially provided with a plurality of ventilation holes. The working fluid gas flow path 100d and the arc channel 300a are communicated through the ventilation holes. The center line of the ventilation holes is inclined relative to the axis of the swirl ring 400 and does not pass through the axis of the swirl ring 400, so that after the working fluid gas passes through the swirl ring 400, a gas flow field that rotates axially forward around the second electrode assembly 300 is formed.

[0042] The number and aperture of the ventilation holes on the swirl ring 400 are designed according to the specification size of the plasma generator. In a specific embodiment of the present application, the swirl ring 400 is circumferentially and uniformly provided with 4 to 10 ventilation holes, and the aperture of the ventilation holes is 1.1 mm to 3.5 mm.

[0043] During application, the working fluid gas passes through the working fluid gas flow path 100d and the swirl ring 400 and enters the arc channel 300a. Since the ventilation holes are inclined, the working fluid gas forms a rotating gas flow field, which can make the distribution of the working fluid gas in the arc channel 300a more uniform, and also make the distribution of the subsequent generated plasma more uniform, thereby improving the stability and uniformity of the generated plasma.

[0044] One of the first electrode assembly 200 and the second electrode assembly 300 is connected to the positive electrode of the power supply, and the other is connected to the negative electrode of the power supply. In an embodiment of the present application, the first electrode assembly 200 is connected to the negative electrode of the power supply as the cathode of the plasma generator, and the second electrode assembly 300 is connected to the positive electrode of the power supply as the anode of the plasma generator. After being powered on, a strong electric field is formed between the first electrode assembly 200 and the second electrode assembly 300.

[0045] Under the action of the above strong electric field, gas molecules are excited to form high-energy plasma. At the same time, the coolant circulates through the coolant flow path formed by connecting in series the coolant inlet flow path 100a, the coolant outlet flow path 100c, the coolant communication flow path 100b, the first electrode cooling flow path, and the second electrode cooling flow path under the drive of an external cooling device, and sequentially cools the first electrode assembly 200 and the second electrode assembly 300 to ensure that the internal temperature of the plasma generator is maintained within a safe range, prevent overheating damage, and increase the service life of the electrodes.

[0046] As Figure 1 and Figure 2 shown, in an embodiment of the present application, the housing 100 includes an inner housing 110, an isolation layer 120, and an outer housing 130 that are sequentially sleeved from the inside outwards.

[0047] Among them, the inner housing 110 and the outer housing 130 serve as the main support structures, providing installation positions and support for the first electrode assembly 200 and the second electrode assembly 300. The inner housing 110 and the outer housing 130 are made of materials with high strength, high temperature resistance, corrosion resistance, and good electrical conductivity to ensure the stability and durability of the device under high temperature conditions. Among them, the outer housing 130 is preferably made of stainless steel, and the inner housing 110 is preferably made of red copper. The isolation layer 120 is made of materials with strong electrical insulation, corrosion resistance, and high temperature resistance to ensure electrical isolation between the outer housing 130 and the inner housing 110. The isolation layer 120 is preferably made of alumina.

[0048] Of course, it should be noted that the specific materials of the above-mentioned outer housing 130, inner housing 110, and isolation layer 120 are only a feasible solution provided by the present application, and are not actually limited thereto. The outer housing 130, inner housing 110, and isolation layer 120 can also be made of other materials that meet the conditions, which are not limited here.

[0049] The inner housing 110 is insulated from the outer housing 130 through the isolation layer 120. The first electrode assembly 200 is disposed on the inner housing 110, the second electrode assembly 300 is disposed on the outer housing 130, the coolant inlet flow channel 100a is disposed on the inner housing 110, the coolant outlet flow channel 100c and the working fluid gas flow channel 100d are disposed on the outer housing 130, and the inner housing 110, the isolation layer 120, and the outer housing 130 jointly enclose the coolant communication flow channel 100b.

[0050] Specifically, as Figure 1 and Figure 2 shown, the outer housing 130 includes a rear end cover 131, an outer sleeve 132, an inner sleeve 133, and a front end cover 134. The outer sleeve 132 is sleeved outside the inner sleeve 133. Both ends of the outer sleeve 132 and both ends of the inner sleeve 133 are respectively connected to the rear end cover 131 and the front end cover 134. The rear end cover 131 and the inner sleeve 133 jointly form a first assembly cavity for assembling the isolation layer 120, the inner housing 110, and the first electrode assembly 200, and the front end cover 134 and the inner sleeve 133 jointly form a second assembly cavity for assembling the second electrode assembly 300.

[0051] Three partitions (not shown in the figure) are provided between the inner sleeve 133 and the outer sleeve 132. The three partitions extend axially from one end of the gap between the inner sleeve 133 and the outer sleeve 132 to the other end along the inner sleeve 133 and the outer sleeve 132, dividing the annular gap between the inner sleeve 133 and the outer sleeve 132 into three partition chambers, which are respectively used for the supply of coolant, the return of coolant, and the supply of working medium gas.

[0052] The rear end cover 131 is provided with a first coolant return section, and the front end cover 134 is provided with a second coolant return section. The first coolant return section and the second coolant return section communicate with the coolant return partition chamber between the inner sleeve 133 and the outer sleeve 132 to form a coolant outlet flow channel 100c.

[0053] The front end cover 134 is provided with a water supply section, and the water supply section communicates with the water supply partition chamber between the inner sleeve 133 and the outer sleeve 132 to form a part of the coolant communication flow channel 100b. At the same time, a plurality of first communication holes are arranged at intervals along the circumferential direction of the inner shell 110, and a plurality of second communication holes are arranged at intervals along the circumferential direction of the isolation layer 120. The number of the first communication holes is the same as that of the second communication holes and they are in one-to-one correspondence and communicate with each other. The inner sleeve 133 is provided with a circumferential ring groove at the position corresponding to the second communication hole, and a third communication hole for communicating with the water supply partition chamber is arranged on the outer periphery of the circumferential ring groove. The first communication hole, the second communication hole, the third communication hole and the circumferential ring groove constitute another part of the coolant communication flow channel 100b.

[0054] The aperture of the above-mentioned first communication hole and the second communication hole is 2 mm to 4 mm, the number of holes is 6 to 10, and one or more third communication holes are provided. The aperture of the third communication hole is slightly larger than the aperture of the first communication hole and the second communication hole.

[0055] The outlet end of the coolant outlet flow channel 100c and the inlet end of the working medium gas flow channel 100d are both arranged on the rear end cover 131, and the outlet end of the coolant outlet flow channel 100c and the inlet end of the working medium gas flow channel 100d are connected to the gas source and the external cooling device by means of a quick-connect joint through a conversion joint.

[0056] To improve the cooling effect on the first electrode assembly 200, such as Figure 1 and Figure 2As shown, in one embodiment of the present application, the first electrode assembly 200 includes a first electrode body 210 and a cooling inner tube 220, the first electrode body 210 is sleeved outside the first end of the cooling inner tube 220, and a first flow gap 200a is formed between the inner wall surface of the first electrode body 210 and the outer tube wall and the first end surface of the cooling inner tube 220, the first flow gap 200a is connected with the tube cavity of the cooling inner tube 220 to form a first electrode cooling channel, the second end of the cooling inner tube 220 is connected with the coolant inlet channel 100a as the inlet end of the first electrode cooling channel, and the end of the first flow gap 200a away from the first end of the cooling inner tube 220 is connected with the inlet end of the coolant connecting channel 100b as the outlet end of the first electrode cooling channel.

[0057] During operation, the coolant first enters the tube cavity of the cooling inner tube 220 from the coolant inlet flow channel 100a, and flows along the tube cavity of the cooling inner tube 220 from the second end of the cooling inner tube 220 to the first end of the cooling inner tube 220, and then passes through the first flow gap 200a and flows into the coolant connecting flow channel 100b. It can be seen that by arranging the cooling inner tube 220 on the first electrode body 210, the flow path of the coolant can be planned, so that the coolant can flow through various parts of the inner wall surface of the first electrode body 210, thereby improving the cooling effect on the first electrode body 210 and reducing the working temperature of the first electrode body 210.

[0058] To further optimize the above technical solution, in one embodiment of the present application, an axial boss 214 is provided on the inner end surface of the first electrode body 210. The axial boss 214 extends along the axial direction of the first electrode body 210 and extends from the first end of the cooling inner tube 220 into the tube cavity of the cooling inner tube 220. An annular gap is formed between the circumferential wall surface of the axial boss 214 and the tube cavity wall surface of the cooling inner tube 220 to increase the heat exchange contact area between the end of the first electrode body 210 and the coolant, thereby further enhancing the cooling effect on the first electrode body 210.

[0059] In order to further improve the heat dissipation effect of the first electrode assembly 200, cooling fins can be evenly distributed along the circumferential direction on at least one of the three places: the outer tube wall of the cooling inner tube 220, the inner wall surface of the first electrode body 210, and the circumferential wall surface of the axial boss 214. The cooling fins extend along the axial direction of the first electrode assembly 200, thereby increasing the heat exchange area. At the same time, the cooling fins arranged between the cooling inner tube 220 and the first electrode body 210 can also support the cooling inner tube 220, so that the cooling inner tube 220 remains stable relative to the first electrode body 210 under the action of the coolant.

[0060] like Figure 1 and Figure 2As shown, in an embodiment of the present application, the second electrode assembly 300 includes a second electrode body 310 and a cooling jacket 320. Among them, the interior of the second electrode body 310 is axially hollow to form an arc channel 300a. The cooling jacket 320 is sleeved outside the second electrode body 310. A second flow gap 300b is formed between the cooling jacket 320 and the second electrode body 310. A third flow gap 300c is provided inside the cooling jacket 320. One end of the second flow gap 300b away from the housing 100 communicates with one end of the third flow gap 300c away from the housing 100 to form a second electrode cooling flow channel. One end of the second flow gap 300b close to the housing 100 serves as the inlet end of the second electrode cooling flow channel and communicates with the outlet end of the coolant communication flow channel 100b. One end of the third flow gap 300c close to the housing 100 serves as the outlet end of the second electrode cooling flow channel and communicates with the coolant outlet flow channel 100c.

[0061] During the working process, the coolant flows into the second flow gap 300b from the coolant communication channel and flows along the second flow gap 300b from one end of the second electrode assembly 300 close to the housing 100 to the end away from the housing 100. After turning at the end of the second electrode assembly 300 away from the housing 100, it enters the third flow gap 300c and flows along the third flow gap 300c from the end away from the housing 100 to the end of the second electrode assembly 300 close to the housing 100, and finally enters the coolant outlet flow channel 100c to complete the cooling of the second electrode assembly 300.

[0062] To further optimize the above technical solution, in an embodiment of the present application, the cooling jacket 320 includes an inner sleeve body 321 and an outer sleeve body 322. The inner sleeve body 321 is sleeved on the second electrode body 310, and the outer sleeve body 322 is sleeved outside the inner sleeve body 321. The gap between the inner sleeve body 321 and the second electrode body 310 is the second flow gap 300b, and the gap between the outer sleeve body 322 and the inner sleeve body 321 is the third flow gap 300c.

[0063] To improve the stability of the second electrode body 310, one or more groups of support bosses 310a are provided between the second electrode body 310 and the inner sleeve body 321 and / or between the second electrode body 310 and the outer sleeve body 322. Each group of support bosses 310a includes at least two support bosses 310a evenly distributed in the circumferential direction. The support bosses 310a are provided on the second electrode body 310, and the top surface of the support bosses 310a is in contact and cooperation with the inner wall surface of the inner sleeve body 321 or the outer sleeve body 322, or the support bosses 310a are provided on the inner wall surface of the inner sleeve body 321 or the outer sleeve body 322, and the top surface of the support bosses 310a is in contact and cooperation with the outer wall surface of the second electrode body 310, thereby improving the stability of the second electrode body 310.

[0064] Further, the above-mentioned supporting boss 310a is provided at one end of the second electrode body 310 away from the housing 100.

[0065] Specifically, in a specific embodiment of the present application, as Figures 1 to 4 shown, a plurality of supporting bosses 310a are circumferentially and spacedly arranged on the outer wall surface of the second electrode body 310, and a gap for coolant to pass through is formed between two adjacent supporting bosses 310a. The top surface of the supporting boss 310a away from the second electrode body 310, that is, the end surface of the supporting boss 310a away from the second electrode body 310 along the radial direction of the second electrode body 310 is in contact and cooperation with the inner wall surface of the inner sleeve body 321.

[0066] Further, as Figures 1 to 4 shown, a limiting boss 310b is provided on the outer wall surface of the second electrode body 310 on the side away from the housing 100, and a pressing boss is provided on the inner wall surface of one end of the outer sleeve body 322 away from the housing 100. The pressing boss protrudes along the radial direction towards the axis of the outer sleeve body 322. During assembly, the annular step surface of the pressing boss facing the housing 100 is in contact and cooperation with the annular step surface of the limiting boss 310b facing away from the housing 100, so as to cooperate with the housing 100 to axially and radially limit the second electrode body 310.

[0067] To improve the cooling effect on the second electrode body 310, a plurality of heat dissipation fins can be evenly distributed along the circumferential direction on the outer wall surface of the second electrode body 310, and the heat dissipation fins extend along the axial direction of the second electrode body 310.

[0068] As Figure 1 and Figure 2 shown, in the present application, the swirl ring 400 is in contact and cooperation with the first electrode body 210 and the second electrode body 310 respectively. Therefore, the swirl ring 400 is made of an insulating material. The swirl ring 400 includes a ring body. An inner ring boss protruding radially inwards along the ring body is provided on the inner wall surface of one end of the ring body, and an outer ring boss protruding radially outwards along the ring body is provided on the outer wall surface of the other end. The inner ring boss is sleeved on the first electrode body 210, the outer ring boss is matched with the inner wall of the inner sleeve 133, and the end surface of the outer ring boss away from the inner ring boss is in contact and cooperation with the end surface of the second electrode body 310.

[0069] To further improve the arc stability, as Figure 1 and Figure 2 shown, the outer wall surface of one end of the first electrode body 210 away from the housing 100 is a first arc starting structure. The first arc starting structure includes a columnar outer peripheral surface 211, a first conical surface 211 and an electrode end surface 213 which are sequentially connected in the order from near to far from the housing 100. The first conical surface 211 tapers from the end connected to the columnar outer peripheral surface 211.

[0070] The inner wall surface of one end of the arc channel 300a close to the housing 100 is the second arc starting structure. The second arc starting structure is sleeved outside the first arc starting structure. The second arc starting structure includes a first columnar inner peripheral surface 311, a second conical surface 312, and a second columnar inner peripheral surface 313 that are sequentially connected in the order of the distance from the housing 100 from near to far. The second conical surface 312 tapers from the end connected to the first columnar inner peripheral surface 311.

[0071] An arc starting cavity is formed between the first arc starting structure and the second arc starting structure. The gap between the first arc starting structure and the second arc starting structure is precisely designed to ensure uniform electric field distribution and can efficiently excite the working medium gas to form plasma.

[0072] In the plasma generator of the embodiment of the present application, a high-frequency arc starting method is adopted. Through an external high-frequency arc starter, first, an arc is struck between the columnar outer peripheral surface 211 of the first electrode body 210 and the first columnar inner peripheral surface 311 of the second electrode body 310 to ionize and conduct the working medium gas in the arc starting cavity to form an arc. Then, under the push of the working medium gas, the arc root of the first electrode body 210 transfers from the columnar outer peripheral surface 211 through the first conical surface 211 and finally stabilizes at the center of the electrode end face 213. The arc root of the second electrode body 310 moves from the first columnar inner peripheral surface 311 continuously downstream to the second conical surface 312 and the second columnar inner peripheral surface 313, and finally balances on the second columnar inner peripheral surface 313 near the opening of the arc channel 300a.

[0073] As Figure 3 shown, in another embodiment of the present application, the inner wall surface of the arc channel 300a further includes a third conical surface 314, a third columnar inner peripheral surface 315, a fourth conical surface 316, and a fourth columnar inner peripheral surface 317 that are sequentially connected to one end of the second columnar inner peripheral surface 313 far from the second conical surface 312 in the order of the distance from the housing 100 from near to far. The third conical surface 314 tapers from the end connected to the second columnar inner peripheral surface 313, and the fourth conical surface 316 expands from the end connected to the third columnar inner peripheral surface 315. The second electrode body 310 with this structure is more suitable for application in the fields of pulverized coal ignition and waste gas treatment.

[0074] The second electrode body 310 can be an integral structure or a split structure. In another embodiment, as Figure 4 shown, the second electrode body 310 includes an arc starting electrode 310c and an output electrode 310d. The arc starting electrode 310c and the output electrode 310d can be connected in various ways, such as detachable connection methods like threaded connection and connection with threaded fasteners, or fixed connection methods like welding. This is not limited herein.

[0075] The inner wall surface of one end of the ignition arc electrode 310c away from the output electrode 310d is a second ignition arc structure, and the inner wall surface of the end of the output electrode 310d connected to the ignition arc electrode 310c is composed of a third conical surface 314, a third columnar inner peripheral surface 315, a fourth conical surface 316, and a fourth columnar inner peripheral surface 317.

[0076] It is not difficult for those skilled in the art to understand that during the operation of the plasma generator in the embodiment of the present application, it is necessary to pass coolant and working medium gas. Therefore, sealing structures are respectively provided at the joints between the inner sleeve 133, the isolation layer 120, and the inner shell 110 near the coolant flow channel and the working medium gas flow channel 100d, at the connection between the first electrode assembly 200 and the inner shell 110, and at the connection between the second electrode assembly 300 and the outer shell 130 for sealing. Each sealing structure includes one or more sealing rings.

[0077] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. An element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity, or device including the element.

[0078] In the description of the present application, unless otherwise clearly defined, words such as "set", "installed", and "connected" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0079] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0080] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A plasma generator, characterized in that, Comprising: A housing (100) provided with a coolant inlet flow channel (100a), a coolant outlet flow channel (100c), a coolant communication flow channel (100b), and a working medium gas flow channel (100d); A first electrode assembly (200) disposed in the housing (100), the first electrode assembly (200) being provided with a first electrode cooling flow channel, an inlet end of the first electrode cooling flow channel being in communication with the coolant inlet flow channel (100a), and an outlet end of the first electrode cooling flow channel being in communication with an inlet end of the coolant communication flow channel (100b); A second electrode assembly (300) disposed in the housing (100) insulated from the first electrode assembly (200), an axial hollow is formed inside the second electrode assembly (300) to form an arc channel (300a), and the second electrode assembly (300) is sleeved outside the first electrode assembly (200). The second electrode assembly (300) is provided with a second electrode cooling flow channel, an inlet end of the second electrode cooling flow channel being in communication with an outlet end of the coolant communication flow channel (100b), and an outlet end of the second electrode cooling flow channel being in communication with the coolant outlet flow channel (100c); A swirl ring (400) disposed between the working medium gas flow channel (100d) and the arc channel (300a), the swirl ring (400) being circumferentially provided with a plurality of vent holes, the working medium gas flow channel (100d) being in communication with the arc channel (300a) through the vent holes, and a center line of the vent holes being inclined with respect to an axis of the swirl ring (400) and not passing through the axis of the swirl ring (400).

2. The plasma generator according to claim 1, wherein The housing (100) includes an inner housing (110), an isolation layer (120), and an outer housing (130) sleeved in sequence from the inside to the outside. The inner housing (110) is insulated from the outer housing (130) by the isolation layer (120). The first electrode assembly (200) is disposed in the inner housing (110), the second electrode assembly (300) is disposed in the outer housing (130), the coolant inlet flow channel (100a) is disposed in the inner housing (110), the coolant outlet flow channel (100c) and the working medium gas flow channel (100d) are disposed in the outer housing (130), and the inner housing (110), the isolation layer (120), and the outer housing (130) together enclose the coolant communication flow channel (100b).

3. The plasma generator according to claim 1, wherein The first electrode assembly (200) includes a first electrode body (210) and a cooling inner tube (220). The first electrode body (210) is sleeved outside the first end of the cooling inner tube (220), and a first flow-through gap (200a) is formed between the inner wall surface of the first electrode body (210), the outer tube wall of the cooling inner tube (220), and the first end face. The first flow-through gap (200a) communicates with the lumen of the cooling inner tube (220) to form the first electrode cooling flow channel. The second end of the cooling inner tube (220) serves as the inlet end of the first electrode cooling flow channel and communicates with the coolant inlet flow channel (100a). One end of the first flow-through gap (200a) far from the first end of the cooling inner tube (220) serves as the outlet end of the first electrode cooling flow channel and communicates with the inlet end of the coolant communication flow channel (100b).

4. The plasma generator according to claim 3, characterized in that, An axial boss (214) is provided on the inner end face of the first electrode body (210). The axial boss (214) extends into the lumen of the cooling inner tube (220) from the first end of the cooling inner tube (220), and an annular gap is formed between the circumferential wall surface of the axial boss (214) and the lumen wall surface of the cooling inner tube (220).

5. The plasma generator according to claim 3, wherein The outer wall surface of the end of the first electrode body (210) far from the housing (100) is a first arc-starting structure. The first arc-starting structure includes a columnar outer peripheral surface (211), a first conical surface (212), and an electrode end face (213) connected in sequence from near to far from the housing (100). The first conical surface (212) tapers from the end connected to the columnar outer peripheral surface (211).

6. The plasma generator according to claim 5, characterized in that, The second electrode assembly (300) includes a second electrode body (310) and a cooling jacket (320). The interior of the second electrode body (310) is axially hollow to form the arc channel (300a). The cooling jacket (320) is sleeved outside the second electrode body (310). A second flow-through gap (300b) is formed between the cooling jacket (320) and the second electrode body (310). A third flow-through gap (300c) is provided inside the cooling jacket (320). One end of the second flow-through gap (300b) far from the housing (100) communicates with one end of the third flow-through gap (300c) far from the housing (100) to form the second electrode cooling flow channel. One end of the second flow-through gap (300b) close to the housing (100) serves as the inlet end of the second electrode cooling flow channel and communicates with the outlet end of the coolant communication flow channel (100b). One end of the third flow-through gap (300c) close to the housing (100) serves as the outlet end of the second electrode cooling flow channel and communicates with the coolant outlet flow channel (100c).

7. The plasma generator according to claim 6, characterized in that, The cooling jacket (320) includes an inner jacket body (321) and an outer jacket body (322). The inner jacket body (321) is sleeved on the second electrode body (310), and the outer jacket body (322) is sleeved outside the inner jacket body (321). The gap between the inner jacket body (321) and the second electrode body (310) is the second flow-through gap (300b), and the gap between the outer jacket body (322) and the inner jacket body (321) is the third flow-through gap (300c).

8. The plasma generator according to claim 6, characterized in that, The inner wall surface of one end of the arc channel (300a) close to the housing (100) is a second arc starting structure. The second arc starting structure is sleeved outside the first arc starting structure. The second arc starting structure includes a first columnar inner peripheral surface (311), a second conical surface (312), and a second columnar inner peripheral surface (313) connected in sequence from the end close to the housing (100). The second conical surface (312) tapers from the end connected to the first columnar inner peripheral surface (311).

9. The plasma generator according to claim 8, characterized in that, The inner wall surface of the arc channel (300a) further includes a third conical surface (314), a third columnar inner peripheral surface (315), a fourth conical surface (316), and a fourth columnar inner peripheral surface (317) connected in sequence from the end of the second columnar inner peripheral surface (313) far from the second conical surface (312). The third conical surface (314) tapers from the end connected to the second columnar inner peripheral surface (313), and the fourth conical surface (316) expands from the end connected to the third columnar inner peripheral surface (315).

10. The plasma generator according to claim 9, characterized in that, The second electrode body (310) includes an arc starting electrode (310c) and an output electrode (310d). The arc starting electrode (310c) and the output electrode (310d) are detachably connected. The inner wall surface of the end of the arc starting electrode (310c) far from the output electrode (310d) is the second arc starting structure, and the inner wall surface of the end of the output electrode (310d) connected to the arc starting electrode (310c) is composed of the third conical surface (314), the third columnar inner peripheral surface (315), the fourth conical surface (316), and the fourth columnar inner peripheral surface (317).

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