Handheld low-power direct-current arc plasma torch

Abstract

A handheld low-power direct-current arc plasma torch comprises a packaging body and an arc discharge combination body, the packaging body is an electric insulation combination body formed by combining two parts and provided with an inner cavity and a handle, and the arc discharge combination body is packaged in the packaging body. The water, electricity and gas pipeline penetrates through an inlet in the lower portion of the handle and then is connected with a water, electricity and gas interface of the arc discharge combination body with the horizontal part packaged inside, and the packaging body is provided with a switch control button used for starting and closing the plasma torch. A direct-current arc plasma discharge structure is comprehensively optimized, and a single water inlet, single water return and all-channel serial circulation structure mode of all internal parts is formed; accurate positioning and electric insulation isolation of the cathode assembly and the anode assembly are achieved through the positioning ring, so that internal water flow channels are easily connected in a butt joint and series connection mode. Full-packaging and motorized handheld operation of the plasma discharge assembly is achieved, the overall structure is simple, mounting and dismounting are convenient, operation is flexible, and use is convenient.

Description

Technical Field

[0001] The present application belongs to the field of arc plasma discharge technology and relates to a handheld low-power DC arc plasma torch. Background Art

[0002] Arc plasma is a typical thermal plasma. Due to its high temperature, high energy density, and high activity, it is widely used in solid waste treatment (including domestic waste, medical waste, biomass, and other industrial waste), energy and chemical industry (ignition and combustion support of coal-fired power plant boilers, pyrolysis, gasification, and recycling of other fossil fuels), material processing (including carbon nanomaterial preparation, powder spheroidization, metal smelting, reduction, and other material heat treatment), and national defense and military industry.

[0003] Currently, there are a variety of generator structures for generating DC arc plasma. However, most plasma torches have high parameters, are large in size, and are fixed to a specific application scenario to generate arc plasma. However, many real-world applications require a miniaturized arc plasma torch with good mobility and low parameters. Therefore, it is necessary to design a small, flexible, and maneuverable handheld DC arc plasma torch that is simple to assemble. Summary of the Invention

[0004] The technical problem solved by the present application is: to overcome the deficiencies of the existing technology, to provide a handheld low-power DC arc plasma torch, to design a special cooling water channel, to realize the integration of the plasma torch into a small handheld package, which is flexible and maneuverable and has flexible usage scenarios.

[0005] The technical solutions provided in this application are as follows:

[0006] A handheld low-power DC arc plasma torch, comprising:

[0007] The package comprises a two-part housing, the two parts of the housing forming an electrically insulating structure having an internal cavity;

[0008] The arc discharge assembly is encapsulated inside the package body and includes a cathode assembly, an insulating assembly and an anode assembly arranged in sequence. The insulating assembly connects and fixes the anode assembly and the cathode assembly together and realizes electrical insulation isolation between the anode assembly and the cathode assembly.

[0009] Furthermore, the anode assembly includes an anode mounting seat and an anode, the anode mounting seat is provided with a mounting through-hole, the anode is mounted in the mounting through-hole, a first annular channel and a second annular channel are formed between the anode and the anode mounting seat, a plurality of water tanks are provided on the outside of the anode, the water tanks are connected to the first channel and the second channel, and the second channel is located on the side of the first channel away from the cathode assembly; the anode mounting seat is provided with a water inlet channel and a water outlet channel, one end of the water inlet channel and the water outlet channel are both located at the end of the anode mounting seat facing the cathode assembly, the other end of the water inlet channel is connected to the first channel, and the other end of the water outlet channel is connected to the second channel;

[0010] The cathode assembly includes a cathode base and a cathode. The end of the cathode base away from the anode assembly is connected to the water outlet nozzle and the air intake nozzle. The other end surface of the cathode base is also connected to the cathode mounting joint and the water channel dividing ring. It is also provided with a cooling water semi-through hole. The water channel dividing ring is a tubular structure with one end open and the other end connected to the water outlet nozzle. The cathode mounting joint is sleeved on the outside of the water channel dividing ring. One end of the cooling water semi-through hole is connected to the flow channel between the cathode mounting joint and the water channel dividing ring.

[0011] The insulating component includes an annular positioning member and a gas distribution member. The annular positioning member is provided with a water cooling channel, which is used to connect the water cooling channel 223 of the cathode base and the water outlet channel of the anode base; the gas distribution member is stuck between the annular positioning member and the anode mounting seat.

[0012] Furthermore, the anode mounting seat includes an anode base and an anode casing, and the anode base is provided with an anode assembly mounting hole, a connecting hole and an annular positioning member mounting hole in sequence along its own axial direction. The diameter of the connecting hole is smaller than the diameter of the anode assembly mounting hole and the annular positioning member mounting hole, and a first step surface is formed between the anode assembly mounting hole and the connecting hole; the anode base is provided with a cooling water through hole and a cooling water semi-through hole, and one end of the cooling water through hole and the cooling water semi-through hole are both located on the first step surface; the anode base is connected to a water inlet nozzle at one end facing the cathode assembly, and a water cooling channel is provided in the anode base, and the water cooling channel is used to connect the cooling water semi-through hole and the water inlet nozzle;

[0013] The anode casing is a cylindrical structure, one end of the anode casing is inserted into the anode assembly mounting hole and cooperates with the first step surface. The anode casing is provided with a water inlet hole and a water outlet hole. One end of the water inlet hole is opposite to the cooling water semi-through hole and the other end extends to the inner wall surface of the anode casing. One end of the water outlet hole is opposite to the cooling water through hole and the other end extends to the inner wall surface of the anode casing. When one end surface of the anode casing contacts the first step surface, the water inlet hole is connected to the cooling water semi-through hole and the water outlet hole is connected to the cooling water through hole.

[0014] The water cooling channel, the cooling water semi-through hole and the water inlet hole form a water inlet channel, and the water outlet hole and the cooling water through hole form a water outlet channel.

[0015] Furthermore, the anode is located inside the anode casing, a through hole is provided at the axial position of the anode, a positioning ring is provided at one end of the anode, and the outer diameter of the positioning ring is larger than the inner diameter of the anode casing; a flaring structure is provided at the other end of the anode, and the large diameter end of the flaring structure is sealed with the inner wall surface of the anode casing; a protrusion is provided on the anode between the flaring structure and the positioning ring, a first channel is formed between the protrusion and the flaring structure, and a second channel is formed between the protrusion and the positioning ring.

[0016] Furthermore, the anode mounting seat also includes a locking ring and an external locking ring. When the locking ring is screwed onto the anode casing, the locking ring presses the positioning ring and the end of the anode casing. The outer wall surface of the anode casing is provided with a fixed step surface. When the external locking ring is screwed onto the outer wall surface of the anode base, the external locking ring presses the fixed step surface so that the anode casing is fixed to the anode base through the external locking ring.

[0017] Furthermore, the cathode tail has a threaded connection section, which is threadedly connected to the cathode mounting joint through an external thread. A groove is provided on the tail end face of the cathode, and a water channel dividing ring is inserted into the groove. There is a gap between the water channel dividing ring and the inner wall of the groove for water circulation.

[0018] Furthermore, after the cathode and cathode base are assembled, the water channel dividing ring extends into the columnar copper of the internal opening of the cathode and the distance from the bottom of the groove is 2-3 mm.

[0019] Furthermore, the cathode base is further provided with an annular channel between the outer side of the cathode mounting joint and the cooling water semi-through hole, and the annular channel is communicated with the air intake nozzle, which is used to connect to an external air pipe.

[0020] Furthermore, the annular positioning member is provided with a secondary stepped through hole, and the bolt is fixed to the threaded hole of the anode base after passing through the secondary stepped through hole, and the bolt head is sunk on the first step inside the secondary stepped through hole, and the bolt is isolated from the end face of the anode base by an insulating cap;

[0021] The annular positioning piece is also provided with two symmetrically distributed threaded holes, and the cathode base is symmetrically provided with two stepped circular through holes on the end face away from the annular positioning piece. The bolts are passed through the stepped circular through holes and connected to the threaded holes to realize the connection between the annular positioning piece and the cathode base.

[0022] Furthermore, an installation groove is provided on the opposite side of the two parts of the shell, and the cathode assembly, the insulating assembly and the anode assembly are all clamped in the installation groove. After the two parts of the shell are connected, a package body is formed; a cavity is provided in the package body, and the cavity is connected to the water inlet nozzle, the water outlet nozzle and the air intake nozzle. The package body is provided with a handle, and a through hole is also provided at the bottom of the handle, and the through hole extends all the way to the cavity of the package body.

[0023] In summary, this application has at least the following beneficial technical effects:

[0024] The present invention provides a handheld low-power DC arc plasma torch. Firstly, the DC arc plasma discharge structure is comprehensively optimized to form a full-channel series circulation structure mode with a single water inlet, a single water return, and internal components. Furthermore, a positioning ring is used to achieve precise positioning and electrical insulation isolation of the cathode assembly and the anode assembly, so that the internal water flow channels can be easily connected and connected. Furthermore, the plasma discharge assembly is fully encapsulated, motorized and handheld operation is achieved, the overall structure is simple, installation and disassembly are convenient, operation is flexible, and it is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a handheld low-power DC arc plasma torch according to the present invention;

[0026] Figure 2 This is a schematic diagram of an arc discharge assembly in a handheld low-power DC arc plasma torch according to the present invention;

[0027] Figure 3 This is a schematic diagram of the packaging body of a handheld low-power DC arc plasma torch according to the present invention;

[0028] Figure 4 Schematic cross-sectional views of the anode base in three directions of a handheld low-power DC arc plasma torch according to the present invention;

[0029] Figure 5 Schematic cross-sectional views of the cathode base in two directions of a handheld low-power DC arc plasma torch according to the present invention;

[0030] Figure 6 Schematic cross-sectional views of an annular positioning member in a handheld low-power DC arc plasma torch according to the present invention in different directions;

[0031] Figure 7 A schematic cross-sectional view of an anode in a handheld low-power DC arc plasma torch according to the present invention. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.

[0033] The present application embodiment proposes a handheld low-power DC arc plasma torch, such as Figure 1As shown, it mainly consists of a package body 1 and an arc discharge assembly 2. The package body is an electrically insulating assembly composed of two parts and has an internal cavity and an external ergonomic handle, and the arc discharge assembly 2 is completely encapsulated inside the package body 1.

[0034] like Figure 2 As shown, the arc discharge assembly 2 is composed of an anode assembly, a cathode assembly and an insulating assembly. The anode assembly is composed of an anode base 21, an anode jacket 23, an anode 24, a locking ring 25 and an external locking ring 26. The cathode assembly is composed of a cathode base 22 and a cathode 27. The insulating assembly is composed of an annular positioning member 28 and a gas distributor 29. The annular positioning member 28 connects and fixes the anode base 21 and the cathode base 22 together, and the annular positioning member 28 and the gas distributor 29 are combined to achieve electrical insulation between the cathode and the anode. Figure 4 As shown, the anode base 21 is a cylindrical structure with a main body having multiple internal channels. The side of the cylinder is a two-stepped boss structure, and a section of metal pipe and a water inlet nozzle 215 are welded to the boss. The main body of the anode base 21 is provided with an anode assembly mounting hole 211, a connecting hole, and an annular locating member mounting hole 212 in sequence along its own axis. The anode assembly mounting hole 211 and the annular locating member mounting hole 212 are connected by the connecting hole. The diameter of the connecting hole is smaller than that of the anode assembly mounting hole 211 and the annular locating member mounting hole 212. A first step surface is formed between the anode assembly mounting hole 211 and the connecting hole. The anode base 21 is also symmetrically provided with two cooling water through holes 213 and two cooling water semi-through holes 214. The cooling water through holes 213 and the cooling water semi-through holes 214 are arranged parallel to the axis of the anode base 21, and one end of each of the cooling water through holes 213 and the cooling water semi-through holes 214 is located on the first step surface. The anode base 21 is provided with multiple water cooling channels 217. Each channel 217 is connected to a water inlet nipple 215 at one end and to one of the cooling water semi-through holes 214 at the other end. The anode base 21 is also provided with four threaded holes 216 on one side of the annular locating member mounting hole 212. The water inlet nipple 215 is used to connect to an external water pipe and is connected to the positive power cable via a specially designed water-to-electricity adapter.

[0035] like Figure 2As shown, the anode casing 23 is a cylindrical structure, with one end of the anode casing 23 inserted into the anode assembly mounting hole 211 and mating with the first stepped surface. A water inlet and a water outlet are formed in the anode casing 23. One end of the water inlet faces the cooling water semi-through hole 214, and the other end extends to the inner wall of the anode casing 23. One end of the water outlet faces the cooling water through hole 213, and the other end extends to the inner wall of the anode casing 23. When one end surface of the anode casing 23 contacts the first stepped surface, the water inlet communicates with the cooling water semi-through hole 214, and the water outlet communicates with the cooling water through hole 213.

[0036] like Figure 2 and Figure 7 As shown, the anode 24 is located inside the anode casing 23. A through hole is provided at the axial position of the anode 24. A positioning ring is provided at one end of the anode 24. The outer diameter of the positioning ring is larger than the inner diameter of the anode casing 23. When the locking ring 25 is screwed onto the anode casing 23, the locking ring 25 presses the positioning ring against the end of the anode casing 23. A flared structure is provided at the other end of the anode 24. The large diameter end of the flared structure is sealed against the inner wall of the anode casing 23. A raised portion is provided between the flared structure and the positioning ring. A first channel is formed between the raised portion and the flared structure, and a second channel is formed between the raised portion and the positioning ring. A plurality of water troughs are provided on the outer wall of the raised portion. The water troughs connect the first channel and the second channel. One end of the water inlet is connected to the first channel, and one end of the water outlet is connected to the second channel.

[0037] The anode 24 acts as a nozzle and is made of copper. The anode 24 is fixed to the anode casing 23 via a locking ring 25. The outer wall of the anode casing 23 is provided with a fixed step surface. When the locking ring 26 is screwed onto the outer wall of the anode base 21, the locking ring 26 presses the fixed step surface, thereby fixing the anode casing 23 to the anode base 21 via the external locking ring 26.

[0038] like Figure 5As shown, the cathode base 22 is a cylindrical structure with a main body and multiple internal channels. Two sections of metal pipes and two water outlet nozzles 221 and an air intake nozzle 222 are welded to one end face of the cylinder. A cathode mounting joint 225 and a water channel dividing ring 224 are also provided on the other end face of the cathode base 22. The water channel dividing ring 224 is a tubular structure with one end open and the other end connected to the water outlet nozzle 221. The cathode mounting joint 225 is sleeved on the outside of the water channel dividing ring 224, forming a flow channel between the cathode mounting joint 225 and the water channel dividing ring 224. The cathode mounting joint 225 has an internal thread and an annular groove with a larger diameter on the outside of the threaded hole, which is used for end face sealing when mating with the cathode 27. The cathode base 22 is also provided with two cooling water semi-through holes 223, both of which are connected to the flow channel between the cathode mounting joint 225 and the water channel dividing ring 224. The water outlet nozzle 221 on the cathode base is used to connect to an external water pipe, and is connected to the negative electrode cable of the power supply through a specially provided water-to-electricity adapter.

[0039] The cathode 27 is composed of a cylindrical copper structure with an internal opening and a conical tungsten-cerium alloy head. Specifically, the head of the cathode 27 is inserted into the flared structure of the anode 24, with a gap between the head and the flared structure. The rear end of the cathode 27 has a threaded connection section that is threadedly connected to the cathode mounting connector 225 in the cathode base via external threads. The cathode 27 and the cathode mounting connector 225 are sealed end-to-end by a sealing ring. A groove is defined on the rear end of the cathode 27, and a water channel dividing ring 224 is inserted into the groove. A gap is provided between the water channel dividing ring 224 and the inner wall of the groove to allow water to circulate.

[0040] The cooling water flowing into the cooling water semi-through hole 223 first enters the circulation channel, then flows out from the gap between the inner wall of the groove and the water channel dividing ring 224 through the circulation channel, and finally enters the water channel dividing ring 224 and flows out from the water outlet nozzle 221 on the cathode base.

[0041] like Figure 2 and Figure 5 As shown, the length of the water channel dividing ring 224 in the cathode base 22 must meet the requirement that after the cathode 27 and the cathode base 22 are assembled, the water channel dividing ring 224 extends into the columnar copper of the internal opening of the cathode 27 and the distance from the bottom part of the hole is 2-3 mm.

[0042] The cathode base 22 also has an annular channel 227 between the outer side of the cathode mounting joint 225 and the semi-through hole 223. This channel 227 communicates with the intake nozzle 222. The intake nozzle 222 is used to connect to an external gas pipe. After entering the intake nozzle 222, gas first flows into the annular channel 227, then into the annular channel 227. Then, it passes through the gas distributor 29 into the anode assembly mounting hole 211, passes through the gap between the cathode 27 and anode 24, and finally flows out of the through hole of the anode 24.

[0043] like Figure 3 As shown, the package body 1 consists of two halves, one of which has a plurality of threaded holes 16 arranged around the cross section of one half, and water pipe slots 12 and 14, an air pipe slot 13, and corresponding mounting slots 15 for the arc discharge assembly 2 arranged elsewhere on the cross section. The slots on one half of the package body are half of the overall slots, and the same number of through holes and slots are arranged at the corresponding positions on the cross section of the other half of the package body, and the through holes are slightly larger than the threaded holes. The two halves of the package body 1 are put together and fixed by bolts to form a package body.

[0044] The bottom of the handle of the package body 1 is also provided with a through hole 11, which extends all the way to the cavity 18 of the package body 1. The cavity 18 is connected to the water pipe slots 12 and 14 and the air pipe slot 13. The rear end of the package body 1 is provided with a switch button 17, which is connected to the power supply via a cable passing through the handle outlet 11 and is used to control the power supply on and off. The output end of the power supply is connected to the anode and cathode. When the switch button 17 is in the on state, the power supply will supply power to the anode and cathode.

[0045] like Figure 6 As shown, the cathode and anode assemblies are isolated by an insulating assembly consisting of an annular positioning member 28 and a gas distributor 29. The annular positioning member 28 is provided with two symmetrically distributed water cooling channels 283, which connect the cathode base water cooling channel 223 with the anode base water cooling channel 213. The water cooling channels on both ends are connected by outer ring sealing ring grooves for accommodating sealing rings for end face sealing.

[0046] The annular locating member 28 is also provided with four secondary stepped through-holes 281 evenly spaced along its central axis. These are used to pass bolts through these secondary stepped through-holes 281 and secure them to the threaded holes 216 of the anode base. The bolt heads are recessed into the first step within these secondary stepped through-holes 281, and an insulating cap isolates the bolts from the end face of the anode base. In addition to securing the annular locating member 28, these four threaded holes also allow for precise positioning of the annular locating member 28 and the anode base 21.

[0047] The annular locating member 28 is also provided with two symmetrically distributed threaded holes 282. Two stepped circular through-holes 226 are symmetrically provided on the end surface of the cathode base 22 facing away from the annular locating member 28, with the larger diameter circular hole located on the side of the smaller diameter circular hole away from the annular locating member 28. Two bolts are inserted through the stepped circular through-holes 226 of the cathode base and then connected to the two symmetrically distributed threaded holes 282 of the annular locating member 28, thereby achieving precise positioning of the annular locating member 28 and the cathode base 22.

[0048] The gas distributor 29 is an annular structure, which passes through the cathode head and is fixed to the middle of the cylindrical part, and is clamped between the annular positioning member 28 and the anode base 21. A series of tangentially rotating air inlet holes are provided in the circumferential direction of the gas distributor 29.

[0049] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0050] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A handheld low-power DC arc plasma torch, characterized in that: include: The package (1) comprises a two-part housing, wherein the two parts of the housing form an electrically insulating structure having an internal cavity; The arc discharge assembly (2) is encapsulated inside the encapsulation body (1) and comprises a cathode assembly, an insulating assembly and an anode assembly which are arranged in sequence. The insulating assembly connects and fixes the anode assembly and the cathode assembly together and realizes electrical insulation isolation between the anode assembly and the cathode assembly.

2. A handheld low-power DC arc plasma torch according to claim 1, characterized in that: The anode assembly comprises an anode mounting seat and an anode (24), wherein the anode mounting seat is provided with a mounting through hole, the anode (24) is mounted in the mounting through hole, a first annular channel and a second annular channel are formed between the anode (24) and the anode mounting seat, a plurality of water tanks are provided on the outside of the anode (24), the water tanks are connected to the first channel and the second channel, and the second channel is located on a side of the first channel away from the cathode assembly; the anode mounting seat is provided with a water inlet channel and a water outlet channel, one end of the water inlet channel and the water outlet channel are both located at one end of the anode mounting seat facing the cathode assembly, the other end of the water inlet channel is connected to the first channel, and the other end of the water outlet channel is connected to the second channel; The cathode assembly comprises a cathode base (22) and a cathode (27). The end of the cathode base (22) away from the anode assembly is connected to a water outlet nozzle (221) and an air intake nozzle (222). The other end surface of the cathode base (22) is also connected to a cathode mounting joint (225) and a water channel dividing ring (224). A cooling water semi-through hole (223) is provided. The water channel dividing ring (224) is a tubular structure. One end of the water channel dividing ring (224) is open, and the other end is connected to the water outlet nozzle (221). The cathode mounting joint (225) is sleeved on the outside of the water channel dividing ring (224). One end of the cooling water semi-through hole (223) is connected to the flow channel between the cathode mounting joint (225) and the water channel dividing ring (224). The insulating component comprises an annular positioning member (28) and a gas distribution member (29). The annular positioning member (28) is provided with a water cooling channel (283). The water cooling channel (283) is used to connect the water cooling channel 223 of the cathode base and the water outlet channel of the anode base. The gas distribution member (29) is stuck between the annular positioning member (28) and the anode mounting seat.

3. A handheld low-power DC arc plasma torch according to claim 2, characterized in that: The anode mounting seat comprises an anode base (21) and an anode jacket (23); the anode base (21) is provided with an anode assembly mounting hole (211), a connecting hole and an annular positioning member mounting hole (212) in sequence along its own axial direction; the diameter of the connecting hole is smaller than the diameters of the anode assembly mounting hole (211) and the annular positioning member mounting hole (212); a first step surface is formed between the anode assembly mounting hole (211) and the connecting hole; the anode base (21) is provided with a cooling water through hole (213) and a cooling water semi-through hole (214); one end of the cooling water through hole (213) and the cooling water semi-through hole (214) are both located on the first step surface; the anode base (21) is connected to a water inlet nozzle (215) at one end facing the cathode assembly; a water cooling channel is provided in the anode base (21); the water cooling channel is used to connect the cooling water semi-through hole (214) and the water inlet nozzle (215); The anode casing (23) is a cylindrical structure. One end of the anode casing (23) is inserted into the anode assembly mounting hole (211) and matched with the first step surface. The anode casing (23) is provided with a water inlet and a water outlet. One end of the water inlet is directly opposite to the cooling water semi-through hole (214), and the other end extends to the inner wall surface of the anode casing (23). One end of the water outlet is directly opposite to the cooling water through hole (213), and the other end extends to the inner wall surface of the anode casing (23). When one end surface of the anode casing (23) contacts the first step surface, the water inlet is connected to the cooling water semi-through hole (214), and the water outlet is connected to the cooling water through hole (213). The water cooling channel, the cooling water semi-through hole (214) and the water inlet hole form a water inlet channel, and the water outlet hole and the cooling water through hole (213) form a water outlet channel.

4. The handheld low-power DC arc plasma torch according to claim 3, characterized in that: The anode (24) is located inside the anode casing (23), a through hole is provided at the axial position of the anode (24), a positioning ring is provided at one end of the anode (24), and the outer diameter of the positioning ring is larger than the inner diameter of the anode casing (23); a flared structure is provided at the other end of the anode (24), and the large diameter end of the flared structure is sealed with the inner wall surface of the anode casing (23); a raised portion is provided between the flared structure and the positioning ring, a first channel is formed between the raised portion and the flared structure, and a second channel is formed between the raised portion and the positioning ring.

5. The handheld low-power DC arc plasma torch according to claim 4, characterized in that: The anode mounting seat further comprises a locking ring (25) and an external locking ring (26); when the locking ring (25) is screwed onto the anode casing (23), the locking ring (25) presses the positioning ring and the end of the anode casing (23); the outer wall surface of the anode casing (23) is provided with a fixed step surface; when the external locking ring (26) is screwed onto the outer wall surface of the anode base (21), the external locking ring (26) presses the fixed step surface, so that the anode casing (23) is fixed to the anode base (21) through the external locking ring (26).

6. The handheld low-power DC arc plasma torch according to claim 3, characterized in that: The cathode (27) has a threaded connection section at its tail end, which is threadedly connected to the cathode mounting joint (225) via an external thread. A groove is provided on the tail end face of the cathode (27), and a water channel dividing ring (224) is inserted into the groove. A gap for water circulation is provided between the water channel dividing ring (224) and the inner wall of the groove.

7. The handheld low-power DC arc plasma torch according to claim 6, characterized in that: After the cathode (27) and the cathode base (22) are assembled, the water channel dividing ring (224) extends into the columnar copper of the internal opening of the cathode (27) at a distance of 2-3 mm from the bottom of the tank.

8. The handheld low-power DC arc plasma torch according to claim 3, characterized in that: The cathode base (22) is further provided with an annular channel (227) between the outer side of the cathode mounting joint (225) and the cooling water semi-through hole (223). The annular channel (227) is communicated with the air intake nozzle (222), and the air intake nozzle (222) is used to connect to an external air pipe.

9. The handheld low-power DC arc plasma torch according to claim 3, characterized in that: The annular positioning member (28) is provided with a secondary stepped through hole (281), and the bolt is fixed to the threaded hole of the anode base after passing through the secondary stepped through hole (281), and the bolt head is sunk on the first step inside the secondary stepped through hole (281), and the bolt is isolated from the end face of the anode base by an insulating cap; The annular positioning member (28) is further provided with two symmetrically distributed threaded holes (282), and the cathode base (22) is symmetrically provided with two stepped circular through holes (226) on the end surface facing away from the annular positioning member (28). Bolts are passed through the stepped circular through holes (226) and connected to the threaded holes (282) to achieve the connection between the annular positioning member (28) and the cathode base (22).

10. The handheld low-power DC arc plasma torch according to claim 1, characterized in that: The two parts of the shell are provided with mounting grooves on opposite sides thereof, and the cathode assembly, the insulating assembly and the anode assembly are all clamped in the mounting grooves, and the two parts of the shell are connected to form a package; The package body (1) is provided with a cavity (18), the cavity (18) is communicated with a water inlet nozzle (215), a water outlet nozzle (221) and an air intake nozzle (222), the package body (1) is provided with a handle, and a through hole (11) is further provided at the bottom of the handle, and the through hole (11) extends all the way to the cavity (18) of the package body (1).

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