Cathode and anode water-cooling series plasma generator

Abstract

The utility model relates to the technical field of ignition equipment, in particular to a cathode and anode water-cooling series plasma generator, which comprises a cathode. The cathode comprises a cathode head and a cathode tube, and the cathode head is connected with one end of the cathode tube; the anode is provided with an arc discharge cavity and an arc through hole, the cathode head is located in the arc discharge cavity, and the arc through hole is communicated with the arc discharge cavity; the ventilation mechanism is communicated with the arc discharge cavity; and the cooling mechanism comprises a cooling route which is used for cooling the cathode and the anode in sequence. According to the plasma generator, the function that the cathode and the anode can be cooled through one water inlet and one water outlet is achieved through reasonable arrangement of all internal parts and water paths, the size of the plasma generator can be reduced, and light weight is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of plasma generator of cathode and anode water cooling series connection, belong to ignition equipment technical field. BACKGROUND

[0002] Plasma generator is triggered arc using high frequency, generates direct current air arc plasma under high pressure, rapidly releases volatile under the high temperature effect generated by plasma generator, so that particle is broken and pulverized, to rapidly burn. Plasma generator is a device with extremely high utilization rate in power plant, and coal powder in burner is ignited by plasma generator in thermal power plant.

[0003] A kind of plasma generator based on sliding arc discharge principle is disclosed in Chinese patent CN205648166U, it includes cathode, anode, working gas passage and insulator, cathode and anode are mutually installed and cooperated by insulator, the spout of working gas passage is located between cathode and anode, the anode is surrounded around cathode, and further include anode gas passage, the anode gas passage is arranged in anode interior, the outlet of anode gas passage is arranged at anode terminal to form molten pool protection gas spout; Although the plasma generator of this structure is simple in structure, but the plasma generator of this structure has no cooling structure, and is easily damaged due to high temperature in use process, increases replacement frequency, and improves use cost. The cathode cooling waterway and the anode cooling waterway of the traditional plasma generator are separately provided, and the water inlet and water outlet pipelines are respectively 2-way, so that the cooling waterway space is large, resulting in that the volume of the plasma generator is large, and a large space of the burner is occupied. UTILITARIAN CONTENT

[0004] The utility model provides a kind of multistage plasma generator of cathode and anode water cooling series connection in view of the deficiency of prior art, the plasma generator optimizes waterway structure, traditional plasma generator inlet and outlet waterway each 2, the improved plasma generator inlet and outlet waterway each 1, save space, reduce the volume of generator, structure is more compact, realize the lightweight of generator.

[0005] The technical scheme that the utility model solves above-mentioned technical problem is as follows: a kind of plasma generator, the plasma generator includes: cathode, the cathode includes cathode head and cathode tube, the cathode head is connected with the cathode tube one end;Anode, the anode is equipped with arc drawing cavity and through arc hole, the cathode head is located in the arc drawing cavity, the through arc hole is communicated with the arc drawing cavity;Ventilation mechanism, the ventilation mechanism is communicated with the arc drawing cavity;Cooling mechanism, the cooling mechanism includes a cooling route, in turn cools the cathode and the anode.

[0006] On the basis of the above technical scheme, the utility model can also be improved as follows:

[0007] Further, the plasma generator further comprises a cathode fixing sleeve made of insulating material; the cathode tube comprises an inner tube and an outer tube, the inner tube and the outer tube are coaxially arranged and one end of each of the inner tube and the outer tube is connected with the cathode head, the length of the inner tube is greater than the length of the outer tube, the other end of the outer tube is connected with the outer wall of the cathode inner tube through the cathode fixing sleeve, and the other end of the inner tube is connected with the cooling mechanism.

[0008] Further, the cooling mechanism comprises a cooling water inlet, a cooling water outlet and a water blocking device; the cooling water inlet is through the inner cavity of the inner tube, the inner tube is provided with a water passing hole A close to the cathode head end; the cathode fixing sleeve is provided with a water passing hole B which communicates the cavity between the inner tube and the outer tube; the cooling water outlet is through the water blocking device; the cooling channel formed by the water blocking device passes through the anode and is through the water passing hole B.

[0009] Further, the plasma generator further comprises a metal shell and an anode fixing sleeve, and the anode is connected with the metal shell through the anode fixing sleeve.

[0010] Further, the outer circle of the cathode fixing sleeve is provided with a step; the water blocking device comprises a first water blocking tube and a second water blocking tube, the first water blocking tube is sleeved on one end of the anode and one outer circle step of the cathode fixing sleeve; the second water blocking tube is arranged outside the first water blocking tube, one end of the second water blocking tube is connected with one outer circle step of the cathode fixing sleeve, the other end of the second water blocking tube is connected with the anode fixing sleeve, and a water passing hole C is arranged on the side of the second water blocking tube close to the end of the anode fixing sleeve, the water passing hole C is through the cavity formed by the second water blocking tube and the metal shell, and the cavity formed by the second water blocking tube and the metal shell is communicated with the cooling water outlet.

[0011] Further, the anode comprises a first anode and a second anode, the first anode is provided with the arc drawing cavity and the arc passing hole, the first anode is connected with one end of the first water blocking tube, and the second anode is connected with the anode fixing sleeve; the water blocking device further comprises a third water blocking tube and a water blocking ring, the third water blocking tube is connected with the second water blocking tube through the water blocking ring, the third water blocking tube is connected with the second anode, and the two ends of the third water blocking tube are each provided with a plurality of water passing grooves recessed inwardly, the water blocking ring divides the water passing grooves into two parts, and the water passing hole B is through the water passing grooves close to the side of the anode fixing sleeve.

[0012] Further, the ventilation mechanism comprises an air inlet, a partition pipe and a cyclone ring, one end of the partition pipe is sleeved on the cathode fixing sleeve, the cathode fixing sleeve is provided with a ventilation hole B, the ventilation hole B and the water hole B do not interfere with each other, the inner hole of the partition pipe is communicated with the air inlet, the outer wall of the partition pipe is communicated with the cooling water outlet, and the partition pipe is used for partitioning the air inlet and the cooling water outlet; the cyclone ring is sleeved on the outer pipe and between the first anode and the cathode fixing sleeve, a plurality of inclined cyclone through holes A and ventilation holes C are arranged on the cyclone ring, the cyclone through holes A are communicated with the arc drawing cavity, and the inner hole of the cyclone ring is communicated with the ventilation hole B.

[0013] Further, the ventilation mechanism further comprises a cyclone ring, the cyclone ring is located between the first anode and the second anode, a plurality of ventilation holes D are arranged on the first anode, the ventilation holes D are communicated with a cavity where the outer wall of the cyclone ring is located, and a plurality of inclined cyclone through holes B are arranged on the cyclone ring and communicated with the arc hole.

[0014] Further, the arc hole of the anode is a multi-step structure.

[0015] The beneficial effects of the embodiments of the utility model include:

[0016] (1) the traditional cathode and anode waterway are separately arranged, the cathode and anode waterway are serially arranged in the utility model, the waterway structure is optimized, the traditional plasma generator inlet and outlet waterway are each 2, the improved plasma generator inlet and outlet waterway are each 1, space is saved, the volume of the generator is reduced, the structure is more compact, and the lightweight of the generator is realized.

[0017] (2) the flame column released by the primary anode and the cathode is small, the setting of the secondary anode and the cyclone ring strengthens the rigidity of the flame and increases the flame intensity.

[0018] (1) low power ignition, energy saving. DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the plasma generator described in the embodiments.

[0020] Figure 2 It is a front view of the plasma generator described in the embodiments.

[0021] Figure 3 It is a sectional view of A-A of Figure 2 .

[0022] Figure 4 It is an enlarged view of a in Figure 3 .

[0023] Figure 5This is a schematic diagram of the three-dimensional structure of the cathode fixing sleeve described in the embodiment;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the swirl ring described in the embodiment;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the swirl ring described in the embodiment;

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of the third water-blocking pipe described in the embodiment;

[0027] Figure 9 This is a schematic diagram of the waterway in the embodiment;

[0028] Figure 10 for Figure 9 Enlarged view of point b in the middle;

[0029] Figure 11 This is a schematic diagram of the airflow path in the embodiment;

[0030] Figure 12 for Figure 11 A magnified view of point c in the middle.

[0031] In the diagram, 1 is the anode; 11 is the first anode; 111 is the arc-drawing cavity; 112 is the arc-passing hole; 113 is the vent hole D; 12 is the second anode; 2 is the cathode; 21 is the cathode head; 22 is the outer tube; 23 is the inner tube; 231 is the water-passing hole A; 3 is the cooling water inlet; 4 is the cooling water outlet; 5 is the cathode fixing sleeve; 51 is the water-passing hole B; 52 is the vent hole B; 61 is the first water-blocking pipe; 62 is the second water-blocking pipe; 621 is the water-passing hole C; 63 is the third water-blocking pipe; 631 is the water-passing groove; 64 is the water-blocking ring; 7 is the metal shell; 8 is the air inlet; 9 is the anode fixing sleeve; 10 is the swirl ring; 101 is the swirl passage hole A; 102 is the vent hole C; 20 is the swirl ring; 210 is the swirl passage hole B; 30 is the isolation pipe. Detailed Implementation

[0032] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0034] like Figure 1 , Figure 3 , Figure 4As shown, a plasma generator with water-cooled cathode and anode in series includes:

[0035] A cathode 2, which includes a cathode head 21 and a cathode tube connected at one end of the cathode head 21;

[0036] An anode 1, which is provided with an arc drawing cavity 111 and an arc passing hole 112, and the cathode head 21 is located in the arc drawing cavity 111, and the arc passing hole 112 is communicated with the arc drawing cavity 111;

[0037] A ventilation mechanism communicated with the arc drawing cavity 111;

[0038] A cooling mechanism, which includes a cooling route to sequentially cool the cathode 2 and the anode 1.

[0039] When the plasma generator works, the gas in the ventilation mechanism is continuously sprayed out of the arc drawing cavity 111, and the discharge is started at the shortest distance between the two electrodes. Due to the pushing of the gas, the arc also moves forward, and the arc is also lengthened with the blowing of the gas. When the length of the arc reaches a position where the electric energy cannot continue to maintain, the arc is extinguished, and a new arc is generated at the smallest distance between the two electrodes, thereby realizing a cycle discharge; the wind blown by the ventilation mechanism blows the arc out of the arc passing hole 112, thereby realizing the ignition operation.

[0040] Because a large amount of heat is generated when the plasma generator works, the water routes of the traditional cathode 2 and the anode 1 are separately arranged, and the water route structure is optimized by the series arrangement of the water routes of the cathode 2 and the anode 1. The improved plasma generator has one water inlet and outlet, which saves space, reduces the volume of the generator, has a more compact structure, and realizes the lightweight of the generator.

[0041] Specifically, as shown in Figure 3 、 Figure 4 、 Figure 5 The plasma generator further includes a cathode fixing sleeve 5 of an insulating material, the cathode tube includes an inner tube 23 and an outer tube 22, the inner tube 23 and the outer tube 22 are coaxially arranged and one end of each is connected with the cathode head 21, the length of the inner tube 23 is greater than the length of the outer tube 22, the other end of the outer tube 22 is connected with the inner wall of the inner tube 23 of the cathode 2 through the cathode fixing sleeve 5, and the other end of the inner tube 23 is connected with the cooling mechanism.

[0042] The embodiment discloses a specific structure of a cathode with water-cooled cathode and anode in series, and the arrangement of the cathode fixing sleeve 5 is beneficial to the stability of the internal structure of the plasma generator, and the outer tube 22 and the inner tube 23 are relatively stably connected on the cathode head 21.

[0043] Specifically, the cooling mechanism comprises a cooling water inlet 3, a cooling water outlet 4 and a water blocking device; the cooling water inlet 3 is in communication with the inner cavity of the inner tube 23, the inner tube 23 is provided with a water passing hole A231, and the water passing hole A231 is close to the end of the cathode head 21; as shown in the drawings, the cathode fixing sleeve 5 is provided with a water passing hole B 51, the water passing hole B 51 is in communication with the cavity between the inner tube 23 and the outer tube 22; the cooling water outlet 4 is in communication with the water blocking device; the cooling channel formed by the water blocking device passes through the anode 1 and is in communication with the water passing hole B 51. Figure 5

[0044] The embodiment discloses a specific structure of water-cooled series connection of cathode and anode, and specifically discloses a specific structure of a cooling mechanism of water-cooled series connection of cathode and anode, as shown in the drawings, Figure 3 Figure 4 Figure 9 Figure 10 As shown in the drawings, cooling water enters from the cooling water inlet 3, reaches the inner cavity of the inner tube 23, passes through the water passing hole A231 in the inner cavity of the inner tube 23, reaches the cavity between the inner tube 23 and the outer tube 22, then passes through the water passing hole B 51 of the cathode fixing sleeve 5, reaches the water blocking device, and then passes through the specific water blocking device. Through the reasonable arrangement of the water blocking device, the cooling water cools the anode 1 and then is discharged from the plasma generator.

[0045] Specifically, as shown in the drawings, Figure 1 Figure 3 Figure 4 The plasma generator further comprises a metal shell 7 and an anode fixing sleeve 9, and the anode 1 is connected with the metal shell 7 through the anode fixing sleeve 9.

[0046] Through the arrangement of the anode fixing sleeve 9, the anode 1 is stably connected with the metal shell 7; at the same time, the arrangement of the metal shell 7 effectively prevents the entry of external impurities.

[0047] Specifically, as shown in the drawings, Figure 3 Figure 4 The outer circle of the cathode fixing sleeve 5 is provided with a step; the water blocking device comprises a first water blocking pipe 61 and a second water blocking pipe 62, the first water blocking pipe 61 is sleeved on one end of the anode 1 and the outer circle step of the cathode 2 fixing sleeve; the second water blocking pipe 62 is arranged on the outer side of the first water blocking pipe 61, one end of the second water blocking pipe 62 is connected with the other outer circle step of the cathode fixing sleeve 5, the other end is connected with the anode fixing sleeve 9, and the second water blocking pipe 62 is provided with a water passing hole C621 on the side close to the end face, the water passing hole C621 is in communication with the cavity formed by the second water blocking pipe 62 and the metal shell 7, and the cavity formed by the second water blocking pipe 62 and the metal shell 7 is in communication with the cooling water outlet.

[0048] ​​​​​​​The embodiment specifically discloses a specific structure of a water blocking device of a cooling mechanism of a cathode and anode water-cooled series connection, and as shown in Figure 3 、 Figure 4 、 Figure 9 、 Figure 10 cooling water passes through the water passing hole B 51 of the cathode fixing sleeve 5, reaches the cavity between the first water blocking pipe 61 and the second water blocking pipe 62, then reaches the cavity formed by the anode 1 and the second water blocking pipe 62, cools the anode 1, passes through the water passing hole C 621 of the second water blocking pipe 62, reaches the cavity formed by the second water blocking pipe 62 and the metal shell 7, and finally is discharged from the plasma generator through the cooling water outlet 4.

[0049] By means of reasonable and ingenious structural arrangement, the space between parts is fully utilized, the cathode 2 and the anode 1 are fully cooled, the volume of the plasma generator is small, and the occupied combustion space is greatly reduced.

[0050] Specifically, the insulating material is PDFE.

[0051] PDFE is used to process the cathode fixing sleeve 5, on the one hand, the low density of PDFE itself reduces the weight of the plasma generator, and light weight can be better realized; on the other hand, the good mechanical strength and processing characteristics of PDFE can play a good supporting role and facilitate processing.

[0052] Specifically, the anode 1 comprises a first anode 11 and a second anode 12, the first anode 11 is provided with the arc drawing cavity 111 and the arc passing hole 112, the first anode 11 is connected with one end of the first water blocking pipe 61, and the second anode 12 is connected with the anode fixing sleeve 9; the water blocking device further comprises a third water blocking pipe 63 and a water blocking ring 64, the third water blocking pipe 63 is connected with the second water blocking pipe 62 through the water blocking ring 64, the third water blocking pipe 63 is connected with the second anode 12, and the two ends of the third water blocking pipe 63 are both provided with a plurality of water passing grooves 631 which are concave inward, the water blocking ring 64 divides the water passing grooves 631 into two parts, the water passing hole B 51 is in communication with the water passing grooves 631 close to the anode fixing sleeve 9, and the structure of the third water blocking pipe 63 is as shown in Figure 8 .

[0053] It should be noted that the first anode 11 and the second anode 12 can be integrated or connected with each other, the arc passing end of the first anode 11 is connected with one end of the second anode 12, and the inner cavity of the second anode 12 is in communication with the arc passing hole 112 of the first anode 11.

[0054] The embodiment discloses an anode 1 structure, through the arrangement of the second anode 12, the strength and rigidity of the plasma arc can be further enhanced, and the interference of the outside on the plasma arc is reduced; and through the arrangement of the third water blocking pipe 63 and the water blocking ring 64, the cooling mechanism can sufficiently cool the first anode 11 and the second anode 12.

[0055] As shown in Figure 9 、 Figure 10 , the cooling water passes through the water passing hole B 51 of the cathode fixing sleeve 5, reaches between the first water blocking pipe 61 and the second water blocking pipe 62 due to the action of the water blocking ring 64, passes through the water passing groove 631 of the third water blocking pipe 63 to cool the second anode 12, then passes through the water passing groove 631 of the water blocking ring 64 close to the anode fixing sleeve 9 side, then passes through the water passing hole C 621 of the second water blocking pipe 62, reaches the cavity formed by the second water blocking pipe 62 and the metal shell 7, and finally is discharged from the plasma generator through the cooling water outlet 4.

[0056] Specifically, as shown in Figure 3 、 Figure 4 、 Figure 11 、 Figure 12 , the ventilation mechanism comprises an air inlet 8, a partition pipe 30 and a cyclone ring 10.

[0057] One end of the partition pipe 30 is sleeved on the cathode fixing sleeve 5, the cathode fixing sleeve 5 is provided with a gas passing hole B 52, the gas passing hole B 52 and the water passing hole B 51 do not interfere with each other,

[0058] the inner hole of the partition pipe 30 is through the air inlet 8, the outer wall of the partition pipe 30 is through the cooling water outlet 4, and the partition pipe 30 is used for partitioning the air inlet 8 and the cooling water outlet 4; the cyclone ring 10 is sleeved on the outer pipe 22 and between the first anode 11 and the cathode fixing sleeve 5, the cyclone ring 10 is provided with a plurality of inclined cyclone through holes A 101 and gas passing holes C 102, the cyclone through holes A 101 are through the arc drawing cavity 111, and the inner hole of the cyclone ring 10 is communicated with the gas passing hole B 52.

[0059] The embodiment discloses a specific implementation of the ventilation mechanism of the first anode 11, as shown in Figure 11 、 Figure 12 , after the airflow enters the air inlet 8, passes through the gas passing hole B 52 on the cathode fixing sleeve 5, enters the inner cavity of the cyclone ring 10, passes through the gas passing hole C 102 of the cyclone ring 10, reaches the space between the inner wall of the first water blocking plate and the outer wall of the cyclone ring 10, passes through the cyclone through hole A 101 of the cyclone ring 10, enters the arc drawing cavity 111, part of the inhaled gas is broken and forms a point, part of the inhaled gas moves forward with the arc, and the length of the arc is stretched.

[0060] Specifically, the ventilation mechanism further comprises a cyclone 20, the cyclone 20 is located between the first anode 11 and the second anode 12, the first anode 11 is provided with a plurality of air holes D113, the air holes D113 are in communication with a cavity where the outer wall of the cyclone 20 is located, the cyclone 20 is provided with a plurality of inclined cyclone through holes B210, and the cyclone through holes B210 are in communication with the arc through hole 112.

[0061] It should be noted that the air holes D113 pass through the two end faces of the first anode 11, and the gas between the outer wall of the cyclone ring 10 and the inside of the first water baffle is led out to the cyclone ring 10 between the first anode 11 and the second anode 12.

[0062] The inclined arrangement of the cyclone through hole A101 of the cyclone ring 10 can make the blown wind present a spiral path, so that the electric arc is blown out in a spiral path, which is more conducive to the gathering of the electric arc for igniting the plasma, thereby being more conducive to improving the rigidity and strength of the electric arc, and thus being more conducive to the realization of the ignition function.

[0063] The embodiment specifically discloses a specific implementation of a ventilation mechanism of the second anode 12, as shown in Figure 11 、 Figure 12 The gas passing through the air hole C102 of the cyclone ring 10 reaches the space between the inner wall of the first water baffle and the outer wall of the cyclone ring 10, part of the gas passes through the cyclone through hole A101 of the cyclone ring 10 and enters the arc drawing cavity 111, and the other part of the gas passes through the air hole D113 of the first anode 11 and enters the outside of the cyclone 20, and then passes through the cyclone through hole B210 of the cyclone 20 and enters the opening of the arc through hole 112. Through the arrangement of the cyclone 20, the intensity of the plasma electric arc emitted from the arc through hole 112 is better, and the rigidity is better.

[0064] Specifically, the arc through hole 112 of the anode 1 is a multi-step structure.

[0065] The multi-stage stepped structure of the through-arc hole 112 can greatly improve the through-arc efficiency and increase the area of the falling arc, so that the plasma generator can achieve good falling arc in the case of high power and low power, and can also achieve good falling arc in the case of large or small ventilation volume in the ventilation mechanism, so that the applicability of the plasma generator is stronger, and good ignition operation can be achieved at a relatively low power, thereby facilitating the reduction of the ignition power. The conventional plasma generator often needs a current of 100A or even higher current when igniting; and it is found through experiments that the plasma generator of the utility model can achieve ignition operation at a current of 40A, which can greatly reduce the ignition power and energy consumption; through actual manufacturing of the plasma generator of the embodiment, the actual volume of the plasma generator can be reduced to two-thirds of the conventional plasma generator with water-cooled cathode and anode.

[0066] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not enumerated, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0067] For those skilled in the art, without departing from the concept of the present utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the present utility model, and the protection scope of the present utility model is subject to the appended claims.

Claims

1. A plasma generator of the type in which the anode and cathode are water-cooled in series, characterized in that, It comprises: a cathode, which comprises a cathode head and a cathode tube, and the cathode head is connected with one end of the cathode tube; an anode, which is provided with an arc striking cavity and an arc passing hole, and the cathode head is located in the arc striking cavity, and the arc passing hole is communicated with the arc striking cavity; a ventilation mechanism, which is communicated with the arc striking cavity; a cooling mechanism, which comprises a cooling route and sequentially cools the cathode and the anode.

2. The plasma generator according to claim 1, wherein the plasma generator further comprises a cathode fixing sleeve made of insulating material; the cathode tube comprises an inner tube and an outer tube, and the inner tube and the outer tube are coaxially arranged and one end of each of the inner tube and the outer tube is connected with the cathode head, the length of the inner tube is greater than the length of the outer tube, the other end of the outer tube is connected with the outer wall of the inner tube through the cathode fixing sleeve, and the other end of the inner tube is connected with the cooling mechanism; the cooling mechanism comprises a cooling water inlet, a cooling water outlet and a water blocking device; 3. The plasma generator of claim 2, wherein, the cooling water inlet is communicated with the inner cavity of the inner tube, the inner tube is provided with a water passing hole A, and the water passing hole A is close to the end of the cathode head; the cathode fixing sleeve is provided with a water passing hole B, and the water passing hole B is communicated with the cavity between the inner tube and the outer tube; the cooling water outlet is communicated with the water blocking device; the cooling channel formed by the water blocking device passes through the anode and is communicated with the water passing hole B. The plasma generator further comprises a metal shell and an anode fixing sleeve, and the anode is connected with the metal shell through the anode fixing sleeve.

4. The plasma generator of claim 3, wherein, 5. The plasma generator according to claim 4, wherein the outer circle of the cathode fixing sleeve is provided with a step; the water blocking device comprises a first water blocking pipe and a second water blocking pipe, the first water blocking pipe is sleeved on one end of the anode and one outer circle step of the cathode fixing sleeve; the second water blocking pipe is arranged outside the first water blocking pipe, one end of the second water blocking pipe is connected with one outer circle step of the cathode fixing sleeve, the other end of the second water blocking pipe is connected with the anode fixing sleeve, and the side surface close to the end of the anode fixing sleeve of the second water blocking pipe is provided with a water passing hole C, the water passing hole C is communicated with the cavity formed by the second water blocking pipe and the metal shell, and the cavity formed by the second water blocking pipe and the metal shell is communicated with the cooling water outlet. the anode comprises a first anode and a second anode, the first anode is provided with the arc striking cavity and the arc passing hole, the first anode is connected with one end of the first water blocking pipe, and the second anode is connected with the anode fixing sleeve; 6. The plasma generator of claim 5, wherein, the water blocking device further comprises a third water blocking pipe and a water blocking ring, the third water blocking pipe is connected with the second water blocking pipe through the water blocking ring, the third water blocking pipe is connected with the second anode, and both ends of the third water blocking pipe are provided with a plurality of water passing grooves which are concave inward, the water blocking ring divides the water passing grooves into two parts, and the water passing hole B is communicated with the water passing grooves close to the anode fixing sleeve.

7. The plasma generator according to claim 6, wherein the ventilation mechanism comprises an air inlet, a partition pipe and a cyclone ring. ​ ​ The partition pipe is sleeved on the cathode fixing sleeve, the cathode fixing sleeve is provided with a ventilation hole B, the ventilation hole B and the water hole B do not interfere with each other, the partition pipe inner hole is communicated with the air inlet, the partition pipe outer wall is communicated with the cooling water outlet, and the partition pipe is used for partitioning the air inlet and the cooling water outlet. The cyclone ring is sleeved on the outer pipe and between the first anode and the cathode fixing sleeve, the cyclone ring is provided with a plurality of inclined cyclone through holes A and ventilation holes C, the cyclone through holes A are communicated with the arc drawing cavity, and the cyclone ring inner hole is communicated with the ventilation hole B.

8. The plasma generator of claim 7, wherein, The ventilation mechanism further comprises a cyclone ring, the cyclone ring is located between the first anode and the second anode, the first anode is provided with a plurality of ventilation holes D, the ventilation holes D are communicated with the cavity where the outer wall of the cyclone ring is located, the cyclone ring is provided with a plurality of inclined cyclone through holes B, and the cyclone through holes B are communicated with the arc through hole.

9. The plasma generator of claim 1, wherein, The arc through hole of the anode is a multi-step structure.

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