Non-high frequency plasma cutting gun with triple cooling and balanced water mist anti-dripping structure

Abstract

The application discloses a non-high-frequency plasma cutting gun with triple cooling and balanced water mist anti-dripping structure, and belongs to the technical field of plasma cutting equipment. The first core is a detachable rebound flow divider with a rebound mechanism, which realizes axial rebound of the electrode and collision protection, and forms a spiral vortex cooling gas path on the outer wall of the electrode. The second core is a non-high-frequency water mist environmental protection system, which realizes water vapor isolation through a water vapor shielding cover, matches a front end insulation structure to prevent water mist short circuit sparking, and additionally arranges inclined guide holes at the large diameter butt joint end of the protection cap, which are connected with inclined atomizing holes on the outer nozzle, so that the condensed water mist and water drops discharged from the outer nozzle are subjected to secondary atomization, the water dripping defect of the traditional water mist gun is solved, and cutting smoke pollution is greatly reduced. The third core is an electrode triple three-dimensional cooling structure, which realizes the triple heat dissipation effect of spiral cooling on the outer wall of the electrode, inner cooling of the electrode core and front end process cooling through the radial eccentric gas distribution hole at the front end of the electrode and the blind hole return gas path of the shaft.

Description

Technical Field

[0001] This invention relates to the field of plasma cutting equipment technology, specifically to a non-high-frequency plasma cutting gun with triple cooling and a balanced water mist anti-drip structure. Background Technology

[0002] Existing non-high-frequency plasma cutting guns are simple in structure, highly stable, and have low maintenance costs, making them widely used in metal cutting. However, existing non-high-frequency cutting guns generally suffer from several shortcomings: the lack of an environmentally friendly dust suppression structure results in the generation of large amounts of high-temperature metal fumes during cutting operations, seriously harming the health of operators and creating a poor working environment. The few water mist dust suppression structures available on the market are only applied to high-frequency cutting guns, and generally suffer from defects such as inadequate water-air isolation, susceptibility to short-circuit arcing, uneven atomization, water dripping and accumulation at the gun head, and inability to operate stably for extended periods, making them unsuitable for use in non-high-frequency guns. Furthermore, traditional non-high-frequency plasma cutting gun electrodes rely solely on a single external air path for cooling, leading to significant temperature rise during prolonged high-load cutting, rapid electrode burn-out, high consumable consumption, and short service life. The industry has long lacked a water mist environmentally friendly cutting gun structure that is stably compatible with non-high-frequency models, completely drip-proof, short-circuit-proof, and features efficient triple cooling. Summary of the Invention

[0003] This invention aims to address the technical pain points of existing non-high-frequency plasma cutting guns, such as lack of environmentally friendly dust reduction function, easy short circuit and dripping after water mist modification, single cooling structure, and short electrode life. It provides a non-high-frequency plasma cutting gun with triple cooling and water mist anti-drip structure, achieving rebound anti-collision protection, triple three-dimensional forced cooling, complete water and air isolation insulation, and secondary atomization anti-drip environmentally friendly cutting, filling a technological gap in the industry.

[0004] The present invention adopts the following technical solution: a non-high frequency plasma cutting gun with triple cooling and balanced water mist anti-drip structure, including a gun head body, a detachable rebound splitter, an electrode, a water vapor shield, an inner nozzle, an outer nozzle, and a protective cap.

[0005] The gun head body is provided with an air tube assembly, the head end of the air tube assembly is closed, and multiple air outlets are provided on the side wall of the air tube assembly.

[0006] The detachable rebound splitter includes a splitter housing, a fixing seat, a piston assembly, and an elastic element. The splitter housing has a hollow cylindrical structure, and its tail end is fixedly connected to the closed head end of the air tube assembly. Gas inside the air tube assembly flows out from the side outlet of the air tube assembly and can flow into the plasma gas channel outside the splitter housing. The fixing seat is fixedly disposed in the rear cavity of the splitter housing, the piston assembly is disposed in the splitter housing cavity in front of the fixing seat, and the elastic element is disposed in the... The fixed base and the piston assembly allow the piston assembly to elastically retract and automatically reset along the axial direction. Several radially eccentric vortex holes are provided on the front side wall of the distributor housing, allowing gas in the plasma gas channel to flow through these holes into the distributor housing cavity. The detachable spring-loaded distributor is an independent modular disassembly structure, allowing for overall disassembly and maintenance. The elastic element provides the electrode with soft anti-collision performance and self-resetting function, buffering impact damage, ensuring accurate electrode repositioning, and stabilizing arc-starting cutting conditions.

[0007] The electrode has a blind hole at its axis, open at the tail end and closed at the head end. The electrode is inserted into the splitter housing, with the tail end of the electrode contacting the head end of the piston assembly. A spiral groove is formed on the outer wall of the rear half of the electrode. When the spiral groove engages with the inner wall of the splitter housing cavity, the gas flowing into the splitter housing cavity forms a spiral vortex cooling gas path after passing through the spiral groove. Several eccentric radial gas distribution holes are formed circumferentially near the working end of the electrode's front end. These eccentric radial gas distribution holes connect the inner cavity of the splitter housing outside the electrode and the blind hole inside the electrode, allowing gas to flow into the splitter... The gas inside the outer shell cavity flows through the eccentric radial air distribution hole to the blind hole, forming a cooling return air path for the electrode core. When the spiral vortex cooling air path and the electrode core cooling return air path are connected, they generate axial air pressure thrust, driving the electrode to synchronously move axially backward, compressing the piston assembly and elastic element, causing the electrode head to separate from the inner nozzle. Driven by air pressure and the elastic element's rebound, the electrode axially extends and retracts, thus completing the separation arc ignition and power-off reset actions. This meets the requirements of arc ignition conditions and provides cushioning and shock absorption under impact conditions, protecting the electrode and nozzle from hard impact damage. Spiral grooves are formed on the outer wall of the electrode, creating a stable spiral vortex cooling air path. An eccentric radial air distribution hole is circumferentially located at the front end of the electrode, and a blind hole with a closed front end is located at the electrode shaft. The radial hole connects the spiral air path on the outer wall and the blind hole at the shaft, allowing airflow to enter the electrode core for internal cooling return, forming a triple three-dimensional cooling system of "outer wall spiral cooling + shaft core cooling + front-end process cooling," significantly improving the electrode's heat dissipation capacity. Furthermore, the blind hole at the center of the electrode is an open structure at the rear end and a closed structure at the front end. The depth of the blind hole does not touch the working end of the electrode, and does not damage the arc-conducting structure. The internal cooling airflow enters from the eccentric radial air distribution hole at the front end and flows back to the inner cavity of the distributor at the rear end, achieving full heat dissipation of the electrode core.

[0008] The inner nozzle is fixedly connected to the head end of the splitter housing of the detachable rebound splitter, and the electrode is wrapped in the splitter housing chamber and the inner nozzle chamber;

[0009] The water vapor shield includes a brass body and an insulating component. The brass body is a hollow cylindrical structure, which wraps around the outside of the detachable rebound splitter. The tail end of the brass body is fixedly connected to the nozzle body, and the head end of the brass body is fixedly connected to the tail end of the inner nozzle. The gas flow chamber formed by the inner side of the brass body and the outer side of the detachable rebound splitter is the plasma gas channel. The head end of the brass body has several axial ventilation holes that connect the plasma gas channel and the outer side of the inner nozzle. The gas in the plasma gas channel flows through the axial ventilation holes to the outside of the inner nozzle, forming a cooling gas path for the outer wall of the front inner nozzle. The insulating component is press-fitted onto the outer surface of the head end of the brass body. The high-temperature resistant insulating component blocks the creepage path between the high-voltage metal components and the outer nozzle and protective cap, making it suitable for humid working environments with water mist. A water vapor shield is installed between the distributor and the external nozzle to isolate the water and air paths. The front end of the shield is equipped with a high-temperature resistant insulation structure to prevent creepage, leakage, short circuit, and arcing in the water mist environment. The brass body of the water vapor shield and the insulating parts are fitted with an interference fit and sealed with a fluororubber O-ring gasket to further block the water and air crossflow path, so that the water mist structure can be stably applied to non-high frequency gun bodies.

[0010] The protective cap is fitted onto the outside of the inner nozzle, and the tail end of the protective cap is pressed and fixed to the head end of the insulating component; the gas flow chamber formed by the inner side of the protective cap and the outer side of the inner nozzle is the cooling gas path of the outer wall of the front inner nozzle.

[0011] The outer nozzle is sleeved on the outside of the water vapor shield, and the head end of the outer nozzle is pressed and fixed to the tail end of the protective cap.

[0012] Furthermore, the protective cap has several oblique atomizing holes circumferentially arranged at its tail end. These holes connect to an annular cavity formed by the outer nozzle and the protective cap. After being buffered and stabilized by the annular cavity, the airflow is ejected through the water mist holes on the outer nozzle. The oblique atomizing holes and the water mist holes on the outer nozzle are arranged opposite each other, ensuring that the airflow flows evenly towards the water mist holes for secondary atomization. This prevents dripping and water accumulation. The protective cap's side wall has oblique guide holes connected to the oblique atomizing holes on the outer nozzle. This allows for secondary atomization of water droplets and free water mist condensed during nozzle operation, breaking down large water droplets into fine water mist, completely eliminating dripping and water accumulation problems at the nozzle. Simultaneously, it achieves dust adsorption and sedimentation during cutting, resulting in environmentally friendly dust removal.

[0013] Furthermore, the outlet direction of the eccentric radial air distribution hole is consistent with the direction of the spiral vortex on the outer wall of the electrode. This does not disturb the original cooling vortex field and arc stability.

[0014] Furthermore, the outer wall of the distributor housing has multiple axial air guide grooves extending from the rear end of the outer wall towards the middle. This increases the gas flow channel and guides the airflow.

[0015] Furthermore, both the piston assembly and the fixed seat have through holes along their central axes. The front sidewall of the piston assembly also has several radial return holes, and the blind hole of the electrode is directly opposite the central through hole of the piston assembly and the fixed seat. This further promotes gas flow within the piston assembly, fixed seat, and electrode, improving the cooling effect.

[0016] Furthermore, a fluororubber O-ring is sandwiched between the brass body and the insulating component. This achieves a water-air seal, completely isolating the dustproof water mist channel of the gun body from the gas path of the central plasma arc zone, preventing water vapor from entering the arc zone and causing arc breakage, arc instability, or gun burn-out malfunctions.

[0017] Furthermore, the overall design employs a non-high-frequency arc-initiating structure, eliminating the need for a high-frequency, high-voltage arc-initiating module. This results in a stable structure with a low failure rate, making it suitable for both handheld and machine-operated industrial cutting applications.

[0018] Compared with the prior art, the present invention has the following significant advantages:

[0019] 1. The detachable spring-loaded diverter has a built-in elastic buffer structure, which can automatically retract and avoid cutting into the workpiece, eliminating the problem of impacting the burner and burning the electrode, and greatly improving the durability of the equipment.

[0020] 2. The outer wall spiral vortex full-area cooling + core blind hole core cooling + front-end process cooling provide full-coverage three-dimensional heat dissipation, resulting in low temperature rise, less burn-off, and significantly reduced material costs during long-term continuous cutting; the eccentric radial hole design perfectly matches the vortex rotation direction, providing excellent arc stability.

[0021] 3. Through the split sealing structure of the water vapor shield and the isolation of the water and gas circuits by the fluororubber sealing gasket, combined with the high temperature resistant insulation structure at the front end, the non-high frequency gun can work with water mist for a long time without leakage, sparking, or arcing.

[0022] 4. The condensed water droplets are atomized and broken up again by the oblique atomizing holes of the external nozzle, which completely eliminates the problems of dripping, running water and dirtying workpieces caused by traditional water mist guns. The water mist is uniform and stable, and the dust removal effect is good. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the gun head of the present invention; Figure 2 This is a schematic diagram of the axial cross-sectional structure of the gun head of the present invention; Figure 3This is a schematic diagram of the explosive structure of the gun head of the present invention; Figure 4 This is a cross-sectional view of the detachable spring diverter of the present invention; Figure 5 This is a cross-sectional view of the electrode of the present invention; Figure 6 This is a cross-sectional view of the water vapor shield sealing structure of the present invention; Figure 7 This is a partially enlarged cross-sectional view of the front end of the nozzle of the present invention (triple cooling air path + water mist atomizing air path).

[0024] in:

[0025] 1-Gunhead body, 2-Detachable rebound splitter, 3-Electrode, 4-Moisture shield, 5-Nozzle, 6-Outer nozzle, 7-Protective cap, 8-Air tube assembly;

[0026] 21-Diverter housing, 22-Fixed base, 23-Piston assembly, 24-Elastic element, 25-Radial eccentric vortex orifice;

[0027] 31-Axial blind hole, 32-Eccentric radial air distribution hole;

[0028] 41-Brass body, 42-Insulating component, 43-Fluororubber O-ring;

[0029] 61 - External nozzle water mist hole; 62 - Annular groove cavity;

[0030] 71-Angled guide hole;

[0031] 81 - Air outlet on the side of the tracheal assembly.

[0032] A-Water mist channel, B-Plasma gas channel, C-Spiral vortex cooling gas path, D-Electrode inner core cooling return gas path, E-Front-end inner nozzle outer wall cooling gas path, F-Secondary atomizing gas, G-Fine water mist. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 7 As shown, a non-high-frequency plasma cutting gun with triple cooling and balanced water mist anti-drip structure includes a gun head body 1, a detachable spring diverter 2, an electrode 3, a water vapor shield 4, an inner nozzle 5, an outer nozzle 6, and a protective cap 7.

[0035] The gun head body 1 is provided with an air tube assembly 8. The head end of the air tube assembly 8 is closed, and multiple air tube assembly side outlets 81 are opened on the side wall of the air tube assembly 8.

[0036] The detachable rebound diverter 2 includes a diverter housing 21, a fixing base 22, a piston assembly 23, and an elastic element 24. The diverter housing 21 is a hollow cylindrical structure. The tail end of the diverter housing 21 is fixedly connected to the closed head end of the gas tube assembly 8. Gas in the gas tube assembly 8 flows out from the side outlet 81 of the gas tube assembly and can flow into the plasma gas channel B outside the diverter housing 21. The fixing base 22 is fixedly disposed in the rear end cavity of the diverter housing 21. The piston assembly 23 is disposed in the cavity of the diverter housing 21 in front of the fixing base 22. The elastic element 24 is disposed between the fixing base 22 and the piston assembly 23, so that the piston assembly 23 can elastically retract and automatically reset along the axial direction. The front side wall of the diverter housing 21 has several radially eccentric vortex holes 25, so that gas in the plasma gas channel B can flow into the cavity of the diverter housing 21 through the radially eccentric vortex holes 25. The detachable spring-loaded diverter features an independent modular design, allowing for complete disassembly and maintenance. Its elastic components provide the electrodes with soft impact resistance and a self-resetting function, buffering impact damage and ensuring precise electrode repositioning for stable arc-starting cutting. The diverter housing 21 has multiple axially oriented air guide grooves extending from the rear end towards the center of the outer wall, increasing gas flow channels and guiding airflow.

[0037] The electrode 3 has a blind hole 31 with an open tail and a closed head, axially. The electrode 3 is inserted into the distributor housing 21, and the tail end of the electrode 3 contacts the head end of the piston assembly 23. A spiral groove is provided on the outer wall of the rear half of the electrode 3. After the spiral groove cooperates with the inner wall of the distributor housing 21, the gas flowing into the distributor housing 21 forms a spiral vortex cooling gas path C after passing through the spiral groove. Several eccentric radial gas distribution holes 32 are opened circumferentially near the working end of the front end of the electrode 3. The eccentric radial gas distribution holes 32 connect the inner cavity of the distributor housing outside the electrode 3 and the blind hole inside the electrode, so that the gas flowing into the distributor housing 21 flows through the eccentric radial gas distribution holes 32 into the blind hole 31 to form the electrode core cooling return gas path D. When the spiral vortex cooling air passage C and the electrode inner core cooling return air passage D are connected, they generate axial air pressure thrust, driving the electrode 3 to synchronously move axially backward, compressing the piston assembly 23 and the elastic element 24, causing the head end of the electrode 3 to separate from the inner nozzle 5. The electrode axial blind hole has a structure with an open rear end and a closed front end. The depth of the blind hole does not touch the working end of the electrode, thus not damaging the arc-conducting structure. The internal cooling airflow enters from the eccentric radial air distribution hole at the front end and returns to the inner cavity of the distributor at the rear end, achieving full-process heat dissipation of the electrode core. The outlet direction of the eccentric radial air distribution hole 32 is consistent with the spiral vortex direction on the outer wall of the electrode 3. This does not disturb the original cooling vortex field and arc stability.

[0038] Preferably, both the piston assembly 23 and the fixed seat 22 have through holes along their central axes. The front sidewall of the piston assembly 23 also has several small radial return holes, and the blind hole 31 of the electrode 3 is directly opposite the central through hole of the piston assembly 23 and the fixed seat 22. This further promotes gas flow within the piston assembly, fixed seat, and electrode, improving the cooling effect.

[0039] The inner nozzle 5 is fixedly connected to the head end of the splitter housing 21 of the detachable rebound splitter 2, and the electrode 3 is wrapped in the chamber of the splitter housing 21 and the chamber of the inner nozzle 5.

[0040] The water vapor shield 4 includes a brass body 41 and an insulating component 42. The brass body 41 is a hollow cylindrical structure, which wraps around the outside of the detachable rebound splitter 2. The tail end of the brass body 41 is fixedly connected to the nozzle body 1, and the head end of the brass body 41 is fixedly connected to the tail end of the inner nozzle 5. The gas flow chamber formed by the inner side of the brass body 41 and the outer side of the detachable rebound splitter 2 is the plasma gas channel B. The head end of the brass body 41 has several axial ventilation holes that connect the plasma gas channel B and the outer side of the inner nozzle 5. The gas in the plasma gas channel flows through the axial ventilation holes to the outside of the inner nozzle, forming the cooling gas path E of the outer wall of the front inner nozzle. The insulating component 42 is press-fitted to the outer surface of the head end of the brass body 41. It is a high-temperature resistant insulating component that blocks the creepage path between the high-voltage metal components and the outer nozzle and protective cap, and is suitable for humid working environments with water mist. Preferably, a fluororubber O-ring 43 is sandwiched between the brass body 41 and the insulating component 42. This achieves a water vapor seal, completely isolating the dustproof water mist channel of the gun body from the gas path of the central plasma arc zone, preventing water vapor from entering the arc zone and causing arc breakage, arc instability, or gun burn-out malfunctions.

[0041] The protective cap 7 is fitted onto the outside of the inner nozzle 5, and the tail end of the protective cap 7 is pressed and fixed to the head end of the insulating component 42. The gas flow chamber formed by the inner side of the protective cap 7 and the outer side of the inner nozzle 5 is the cooling gas path E of the outer wall of the front inner nozzle.

[0042] The outer nozzle 6 is sleeved on the outside of the water vapor shield 4, and the head end of the outer nozzle 6 is pressed and fixed to the tail end of the protective cap 7.

[0043] The protective cap 7 has several oblique atomizing holes 71 arranged circumferentially at its tail end. These holes 71 connect to an annular cavity 62 formed by the outer nozzle 6 and the protective cap 7. After being buffered and stabilized by the annular cavity 62, the airflow is ejected through the water mist holes 61 on the outer nozzle 6. The oblique atomizing holes 71 and the water mist holes 61 on the outer nozzle are arranged opposite each other, allowing the airflow to flow evenly towards the water mist holes for secondary atomization. This prevents dripping and water accumulation. The oblique atomizing holes on the protective cap are angled towards the water mist extraction gap, which can disperse the large condensed water droplets extracted from the outer nozzle into uniform and fine water mist, achieving drip-free, low-smoke, and environmentally friendly cutting operations.

[0044] When the equipment is in operation with ventilation, the circulating process gas generates axial pressure thrust, causing electrode 3 to move backward axially in sync. This, in turn, pushes piston assembly 23 to compress elastic element 24, causing electrode 3 to separate from the end face of inner nozzle 5, thus completing the arc ignition operation. When the cutting operation ends and the gas passage is cut off, elastic element 24 is released from its compressed state and pushes piston assembly 23 downward with its own elastic restoring force, causing electrode 3 to fall back to its initial assembly position, ensuring normal start-up and shutdown for the next operation.

[0045] The outer wall of electrode 3 is provided with a spiral groove, which cooperates with the inner hole of the distributor 2 to form a continuous spiral vortex cooling air path, realizing 360° circumferential heat dissipation around the outer wall of electrode 3. A central blind hole 31, closed at the front end and open at the rear end, is provided at the axis of electrode 3. Two eccentric radial air distribution holes 32 are evenly arranged circumferentially at the front end of electrode 3, connecting the spiral air path on the outer wall to the central blind hole 31. During operation, the spiral vortex cooling air path C swirls at high speed along the spiral groove on the outer wall of electrode 3 to dissipate heat. Part of the airflow enters the interior of the central blind hole 31 through the eccentric radial air distribution holes 32, forming a cooling return air path D for the inner core of the electrode, achieving forced internal cooling of the core of electrode 3. The annular gap between the inner nozzle 5 and the protective cap 6 ejects the cooling air path E from the outer wall of the front inner nozzle, forming a front-end process cooling and arc protection air curtain. The three airflows cooperate to form a complete triple three-dimensional cooling system. The water vapor shield 4 is clamped between the detachable rebound diverter 2 and the external nozzle 6. The water vapor shield 4 consists of a brass body 41, a front insulating component 42, and a fluororubber O-ring 43. The brass body 41 and the insulating component 42 are precision interference-fitted, and the fluororubber O-ring 43 is sandwiched in the middle to achieve a seal, completely physically isolating the water mist channel A inside the equipment from the central plasma gas channel B, preventing water mist from entering the arc zone and causing arc breakage, arc disorder, or gun burnout. At the same time, the insulating component 42 at the front end of the water vapor shield 4 is a high-temperature resistant insulating structure, which can completely block the creepage path between high-voltage metal components, so that the present invention does not leak electricity or spark under high humidity and high water mist conditions, solving the industry problem that traditional non-high frequency guns cannot be equipped with water mist systems.

[0046] The protective cap 7 has obliquely arranged atomizing holes 71 at its large-diameter end. These holes 71 connect to the annular cavity 62 formed by the outer nozzle 6 and the protective cap 7. After the airflow is buffered and stabilized by the annular cavity 62, it is ejected through the water mist holes 62 on the outer nozzle 6. The oblique atomizing holes 71 and the water mist holes 61 are arranged opposite each other. During operation, large condensed droplets on the surface of the outer nozzle 6 due to temperature differences and water droplets deposited in the internal cavity of the outer nozzle 6 are broken up by the oblique blowing action of the secondary atomizing gas F, forming a uniform suspended fine water mist. This completely eliminates the problem of dripping, flowing, and accumulating water contaminating the workpiece. At the same time, the stable water mist curtain can quickly absorb and settle cutting dust, achieving environmentally friendly cutting operations. This invention adopts a non-high-frequency, low-pressure contact arc initiation method, eliminating the need for a high-frequency, high-voltage module. It has no high-frequency interference, an extremely low failure rate, and is compatible with industrial handheld cutting and fully automatic cutting equipment. It features a stable structure, long service life, and significant environmental benefits.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A non-high-frequency plasma cutting torch with triple cooling and a balanced water mist anti-drip structure, characterized in that: It includes the gun head body (1), a detachable rebound splitter (2), an electrode (3), a water vapor shield (4), an inner nozzle (5), an outer nozzle (6), and a protective cap (7). The gun head body (1) is provided with an air tube assembly (8), the head end of the air tube assembly (8) is closed, and the side wall of the air tube assembly (8) is provided with multiple air tube assembly side outlets (81). The detachable rebound splitter (2) includes a splitter housing (21), a fixing seat (22), a piston assembly (23), and an elastic element (24); the splitter housing (21) is a hollow cylindrical structure, and the tail end of the splitter housing (21) is fixedly connected to the closed head end of the air pipe assembly (8). The gas in the air pipe assembly (8) flows out from the side outlet (81) of the air pipe assembly and can flow into the plasma gas channel (B) outside the splitter housing (21); the fixing seat (22) is fixedly installed on the splitter housing (21). Inside the rear cavity, the piston assembly (23) is disposed in the cavity of the distributor housing (21) in front of the fixed seat (22), and the elastic element (24) is disposed between the fixed seat (22) and the piston assembly (23), so that the piston assembly (23) can elastically retract and automatically reset along the axial direction; the front side wall of the distributor housing (21) is provided with a plurality of radially eccentric vortex holes (25), so that the gas in the plasma gas channel (B) can flow through the radially eccentric vortex holes (25) into the cavity of the distributor housing (21); The electrode (3) has a blind hole (31) with an open tail end and a closed head end. The electrode (3) is inserted into the splitter housing (21), and the tail end of the electrode (3) contacts the head end of the piston assembly (23). The outer wall of the rear half of the electrode (3) is provided with a spiral groove. After the spiral groove is matched with the inner wall of the splitter housing (21), the gas flowing into the splitter housing (21) forms a spiral vortex cooling gas path (C) after passing through the spiral groove. Several eccentric radial gas distribution holes (32) are opened circumferentially near the working end of the front end of the electrode (3). The eccentric radial air distribution hole (32) connects the inner cavity of the splitter shell outside the electrode (3) and the blind hole inside the electrode, so that the gas flowing into the cavity of the splitter shell (21) flows through the eccentric radial air distribution hole (32) into the blind hole (31) to form the electrode core cooling return air path (D); the spiral vortex cooling air path (C) and the electrode core cooling return air path (D) can generate axial air pressure thrust after being connected, which drives the electrode (3) to move axially backward in sync to compress the piston assembly (23) and the elastic element (24), so that the head end of the electrode (3) separates from the inner nozzle (5); The inner nozzle (5) is fixedly connected to the head end of the splitter housing (21) of the detachable rebound splitter (2), and the electrode (3) is wrapped in the chamber of the splitter housing (21) and the chamber of the inner nozzle (5); The water vapor shield (4) includes a brass body (41) and an insulating component (42). The brass body (41) is a hollow cylindrical structure. The brass body (41) is wrapped around the outside of the detachable rebound splitter (2). The tail end of the brass body (41) is fixedly connected to the gun head body (1), and the head end of the brass body (41) is fixedly connected to the tail end of the inner nozzle (5). The gas flow chamber formed by the inner side of the brass body (41) and the outer side of the detachable rebound splitter (2) is the plasma gas channel (B). The head end of the brass body (41) is provided with several axial ventilation holes that connect the plasma gas channel (B) and the outer side of the inner nozzle (5). The gas in the plasma gas channel flows through the axial ventilation holes to the outside of the inner nozzle and forms a cooling gas path (E) on the outer wall of the front inner nozzle. The insulating component (42) is press-fitted to the outer surface of the head end of the brass body (41). The protective cap (7) is fitted on the outside of the inner nozzle (5), and the tail end of the protective cap (7) is pressed and fixed to the head end of the insulating component (42); the gas flow chamber formed by the inner side of the protective cap (7) and the outer side of the inner nozzle (5) is the cooling gas path (E) of the outer wall of the front inner nozzle. The outer nozzle (6) is sleeved on the outside of the water vapor shield (4), and the head end of the outer nozzle (6) is pressed and fixed to the tail end of the protective cap (7).

2. The non-high-frequency plasma cutting gun with triple cooling and balanced water mist anti-drip structure according to claim 1, characterized in that: The protective cap (7) has several oblique atomizing holes (71) arranged circumferentially at its tail end. The oblique atomizing holes (71) are connected to the annular cavity (62) formed by the outer nozzle (6) and the protective cap (7). After the airflow is buffered and stabilized by the annular cavity (62), it is sprayed out through the water mist hole (61) on the outer nozzle (6). The oblique atomizing holes (71) and the water mist hole (61) of the outer nozzle are arranged one to one, and the airflow flows evenly to the water mist hole of the outer nozzle to complete the secondary atomization.

3. A non-high-frequency plasma cutting gun with triple cooling and a balanced water mist anti-drip structure according to claim 1, characterized in that: The outlet direction of the eccentric radial air distribution hole (32) is consistent with the spiral vortex direction of the outer wall of the electrode (3).

4. A non-high-frequency plasma cutting gun with triple cooling and a balanced water mist anti-drip structure according to claim 1, characterized in that: The outer wall of the splitter housing (21) has multiple axial air guide grooves extending from the rear end of the outer wall toward the middle of the outer wall.

5. A non-high-frequency plasma cutting gun with triple cooling and balanced water mist anti-drip structure according to claim 1, characterized in that: Both the piston assembly (23) and the fixed seat (22) have through holes along the central axis. The front side wall of the piston assembly (23) also has several piston radial return holes, and the blind hole (31) of the electrode (3) is directly opposite the central through hole of the piston assembly (23) and the fixed seat (22).

6. A non-high-frequency plasma cutting gun with triple cooling and a balanced water mist anti-drip structure according to claim 1, characterized in that: A fluororubber O-ring (43) is sandwiched between the brass body (41) and the insulating component (42).

7. A non-high-frequency plasma cutting gun with triple cooling and a balanced water mist anti-drip structure according to claim 1, characterized in that: The entire structure adopts a non-high-frequency arc initiation structure, eliminating the need for a high-frequency, high-voltage arc initiation module.

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