CN216502916U - Water-cooled high-power plasma arc cutting torch - Google Patents

Abstract

The utility model relates to a water-cooled high-power plasma arc cutting torch, which comprises a clamping tube connecting seat, a clamping tube, a torch head fixing cover, a nozzle seat, an outer cover, an inner cover, an outer shunt, an outer protective cover, an electrode seat combining cap, an electrode seat, a water needle, a lining stop ring, an electrode, an inner shunt, a nozzle, an electric water inlet pipe assembly and a water return pipe assembly. The water-cooled high-power plasma arc cutting torch is subjected to double cooling protection through the circulating cooling water path and the circulating cooling gas path, so that the service lives of an electrode and a nozzle are prolonged as much as possible; the circulating cooling water path designed in the utility model has a simple structure, so that the manufacturing of parts is simple, and the cooling effect of the path is better.

Description

Water-cooled high-power plasma arc cutting torch

Technical Field

The utility model relates to the technical field of plasma processing, in particular to a water-cooled high-power plasma arc cutting torch.

Background

The metal hot cutting is a necessary process for most metal processing, and the metal hot cutting generally comprises gas cutting, plasma cutting, laser cutting and the like. Gas cutting is gradually replaced by plasma cutting with wide cutting field, high efficiency and higher precision due to the defects of low precision, small range of cutting materials and the like. Although the laser cutting is better than the plasma cutting in quality and precision, the cost is high, the laser cutting is inconvenient, so the audience range is small, and the plasma cutting becomes the current mainstream cutting mode; generally, to increase the cutting thickness of the plasma arc, the operating current needs to be increased. The increased current causes the electrodes to burn out quickly and cause double arcs, burning out the nozzle. Therefore, the conventional air cooling mode cannot meet the use requirement, and the electrode and the nozzle must be protected by adopting a water cooling mode, so that the service life of the electrode and the nozzle is prolonged; the existing high-current water-cooling plasma arc cutting torch on the market is relatively complex in structural design, the cost of processing and materials is increased, and high use cost is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a water-cooled high-power plasma arc cutting torch, which aims to solve the technical problems of simplifying the internal structure of the water-cooled high-power plasma arc cutting torch, simplifying the fixing mode of an electrode seat and saving the cost.

The water-cooled high-power plasma arc cutting torch is realized by the following steps: a water-cooled high power plasma arc torch comprising: the device comprises a clamping pipe connecting seat, a clamping pipe, a gun head fixing cover, a nozzle seat, an outer cover, an inner cover, an outer shunt, an outer protective cover, an electrode seat combining cap, an electrode seat, a water needle, a lining stop ring, an electrode, an inner shunt and a nozzle; wherein

The upper end and the lower end of the clamping pipe connecting seat are both in threaded connection with a clamping pipe, and the lower end of the clamping pipe positioned below is connected with the gun head fixing cover; the nozzle seat is fixed in the inner cavity of the gun head fixing cover, the electrode seat is arranged in the middle of the nozzle seat, and the upper end of the electrode seat extends out of the nozzle seat and is arranged upwards; the lining stop ring is arranged between the electrode holder and the nozzle holder in a limiting manner, the lining is arranged above the lining stop ring and positioned between the electrode holder and the nozzle holder, and the electrode holder and the cap are in threaded connection with the upper end of the electrode holder and are limited on the upper end surface of the lining; the water needle is arranged in the middle of the electrode seat, the electrode is fixed with the lower end of the electrode seat, and the outer cover is in threaded connection with the lower end of the gun head fixing cover; the outer protection cover is connected with the lower end part of the outer cover, the inner cover is in threaded connection with the outer wall of the lower end of the nozzle seat, one end of the nozzle is limited at the lower end of the nozzle seat, and the other end of the nozzle is limited at the lower end of the inner wall of the inner cover; and the inner shunt is limited between the outer wall of the upper end of the electrode and the upper end part of the inner wall of the nozzle, and the outer shunt is arranged between the middle part of the inner end face of the outer protection cover and the lower end part of the outer end face of the inner cover.

In an optional embodiment of the utility model, a shielding gas channel, a plasma gas channel and a water outlet channel are respectively arranged in the nozzle seat; the upper end surface of the nozzle seat is welded with a shielding gas inlet pipe assembly communicated with the shielding gas channel, the upper end surface of the nozzle seat is welded with a plasma gas inlet pipe assembly communicated with the plasma gas channel, and the upper end surface of the nozzle seat is welded with a water return pipe assembly communicated with the water outlet channel; the protective gas inlet pipe assembly, the plasma gas inlet pipe assembly and the water return pipe assembly are all located in the clamping pipe.

In an optional embodiment of the utility model, an electricity inlet and water inlet pipe assembly is welded at the upper end of the electrode holder, and a hollow channel suitable for water to enter is formed between the electrode holder and the middle part of the water needle; the electricity inlet water inlet pipe assembly is located in the middle of the clamping pipe.

In an alternative embodiment of the utility model, the upper end part of the inner cavity of the nozzle seat is provided with a circle of bulges, and the bulges are abutted against the outer side of the upper end surface of the lining stop ring for limiting the upward movement of the lining stop ring.

In an optional embodiment of the utility model, the upper end of the inner cavity of the lining retaining ring is also provided with a circle of bulges, and the outer side of the lower end part of the electrode holder is provided with a circle of lugs matched with the bulges in the inner cavity of the lining retaining ring to limit the downward movement of the lining retaining ring.

In an optional embodiment of the utility model, the inner cavity of the nozzle holder is also provided with a water inlet channel, and the inside of the liner is also provided with a water passage communicated with the water inlet channel of the nozzle holder; and a water through hole of the electrode holder is formed in the side wall of the middle part of the electrode holder, and the water through hole is communicated with the water through channel of the lining.

In an optional embodiment of the utility model, a cavity between the outer wall of the water needle and the inner walls of the electrode and the electrode holder forms a first water cooling cavity; a cavity between the inner wall of the inner cover and the outer wall of the nozzle forms a second water cooling cavity; the water inlet pipe assembly, the hollow channel, the first water cooling cavity, the limber hole, the water passage, the water inlet channel, the second water cooling cavity, and the circulating cooling water path formed between the water return channel and the water return pipe assembly.

In an optional embodiment of the utility model, a cavity between the inner wall of the gun head fixing cover and the outer wall of the nozzle seat forms a first air cooling cavity; a cavity between the inner wall of the outer cover and the outer wall of the inner cover forms a second gas cooling cavity; a cavity between the outer wall of the inner cover and the inner wall of the outer protection cover forms a third gas cooling cavity; the shielding gas inlet pipe assembly, the shielding gas channel, the first gas cooling cavity, the second gas cooling cavity, the outer splitter and the third gas cooling cavity form a circulating cooling gas circuit.

In an optional embodiment of the utility model, a cavity between the outer wall of the lower end of the electrode holder and the inner wall of the lower end of the nozzle holder forms a fourth air cooling cavity; the fourth gas cooling cavity is communicated with the plasma gas channel on the nozzle seat; a cavity between the outer wall of the lower end of the electrode and the inner wall of the nozzle forms a plasma airflow cavity; the plasma gas inlet pipe assembly is communicated with the plasma gas channel, the fourth gas cooling cavity, the inner shunt and the plasma gas flow cavity form a complete plasma gas path.

In an optional embodiment of the utility model, the hollow parts except the circulating cooling water path and the circulating cooling gas path in the inner cavity of the water-cooled high-power plasma arc cutting torch are filled with sealing and fixing glue.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects: the installation process and the structure of the water-cooled high-power plasma arc cutting torch are simplified, and the installation efficiency and the stability of the water-cooled high-power plasma arc cutting torch can be improved through threaded connection. The structure is simplified, the processing difficulty and the material cost of parts are reduced, the production cost is greatly reduced under the condition of meeting the same functionality, and the use cost of a user is reduced; further, through a circulating cooling water path and a circulating cooling gas path, double cooling protection is carried out on the water-cooled high-power plasma arc cutting torch, and the service lives of an electrode and a nozzle are prolonged as much as possible; the circulating cooling water path designed in the utility model has a simple structure, so that the manufacturing of parts is simple, and the cooling effect of the path is better.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 illustrates a schematic view of a gas path structure of a water-cooled high power plasma arc torch provided by an embodiment of the utility model;

FIG. 2 illustrates a schematic diagram of a water path configuration for a water-cooled high power plasma arc torch provided by an embodiment of the present invention;

FIG. 3 is a partially enlarged schematic view of an air passage structure provided in an embodiment of the present invention;

FIG. 4 is a partial enlarged schematic view of a waterway structure provided by the embodiment of the utility model;

fig. 5 is a diagram illustrating a structure of an inner splitter according to an embodiment of the present invention.

In the figure: the gas cooling device comprises a protective gas inlet pipe assembly 1, a clamping pipe connecting seat 2, a clamping pipe 3, a gun head fixing cover 4, a first gas cooling cavity 401, a nozzle seat 5, a protective gas channel 502, a plasma gas channel 503, a water inlet channel 504, a water outlet channel 505, an outer cover 6, a second gas cooling cavity 601, an inner cover 7, an outer flow divider 8, an outer protective cover 9, a third gas cooling cavity 901, a plasma gas inlet pipe assembly 10, an electrode seat combining cap 11, an electrode seat 12, a water through hole 1201, a hollow channel 1202, a fourth gas cooling cavity 1203, a water needle 13, a first water cooling cavity 1301, a second water cooling cavity 1302, a lining 14, a water through channel 1401, a lining stop ring 15, an electrode 16, a plasma gas flow cavity 1601, an inner flow divider 17, a nozzle 18, a power inlet pipe assembly 19, a water return pipe assembly 20 and sealing fixing glue 21.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Example 1:

referring to FIGS. 1-5, a water-cooled high power plasma arc torch includes: the device comprises a clamping tube connecting seat 2, a clamping tube 3, a gun head fixing cover 4, a nozzle seat 5, an outer cover 6, an inner cover 7, an outer shunt 8, an outer protective cover 9, an electrode seat combining cap 11, an electrode seat 12, a water needle 13, a lining 14, a lining stop ring 15, an electrode 16, an inner shunt 17 and a nozzle 18.

Wherein the upper end and the lower end of the clamping tube connecting seat 2 are both in threaded connection with a clamping tube 3, the lower end of the clamping tube 3 positioned below is connected with a gun head fixing cover 4, a nozzle holder 5 is fixed in the inner cavity of the gun head fixing cover 4, an electrode holder 12 is arranged in the middle of the nozzle holder 5, the upper end of the electrode holder extends out of the nozzle holder 5 and is upwards arranged, an inner lining stop ring 15 is limited and arranged between the electrode holder 12 and the nozzle holder 5, an inner lining 14 is arranged above the inner lining stop ring 15 and is positioned between the electrode holder 12 and the nozzle holder 5, the electrode holder and a cap 11 are in threaded connection with the upper end surface of the inner lining 14, a water needle 13 is arranged in the middle of the electrode holder 12, an electrode 16 is fixed with the lower end of the electrode holder 12, an outer cover 6 is in threaded connection with the lower end of the gun head fixing cover 4, an outer protective cover 9 is connected with the lower end of the outer cover 6, an inner cover 7 is in threaded connection with the outer wall of the lower end of the nozzle holder 5, one end of a nozzle 18 is limited and is limited at the other end of the lower end of the inner wall of the nozzle holder 5, the inner shunt 17 is limited between the outer wall of the upper end of the electrode 16 and the upper end of the inner wall of the nozzle 18, and the outer shunt 8 is arranged between the middle part of the inner end face of the outer protection cover 9 and the lower end part of the outer end face of the inner cover 7.

Wherein, centre gripping union coupling seat 2 mainly plays the transition effect, and equal threaded connection centre gripping pipe 3 around, so will be divided into two parts with centre gripping pipe 3, be for the convenience of filling sealed fixed glue 21 on the one hand, be for the convenience of the installation of each way pipeline on the one hand. The plasma arc cutting torch with large current is a machine plasma arc cutting torch, mechanical clamping is needed, and the clamping part of the clamping tube 3 is made of stainless steel, durable and difficult to deform.

Optionally, a shielding gas channel 502, a plasma gas channel 503, and a water outlet channel 505 are respectively arranged inside the nozzle holder 5; wherein the upper end surface of the nozzle holder 5 is welded with a shielding gas inlet pipe component 1 communicated with the shielding gas channel 502, the upper end surface of the nozzle holder 5 is welded with a plasma gas inlet pipe component 10 communicated with the plasma gas channel 503, and the upper end surface of the nozzle holder 5 is welded with a water return pipe component 20 communicated with the water outlet channel 505; the protective gas inlet pipe component 1, the plasma gas inlet pipe component 10 and the water return pipe component 20 are all located in the clamping pipe 3.

In addition, the upper end of the electrode holder 12 is welded with an electricity inlet and water inlet pipe assembly 19, and a hollow channel 1202 suitable for cooling water to enter is formed between the electrode holder 12 and the middle part of the water needle 13; the electricity inlet water pipe assembly 19 is positioned in the middle of the clamping pipe 3. The cooling water enters the hollow passage 1202 from the water inlet pipe assembly 19 and flows into the bottom of the electrode 16.

Wherein, the shield gas inlet pipe subassembly 1 welds on nozzle holder 5 shield gas passageway 502, and plasma gas inlet pipe subassembly 10 welds on nozzle holder 5 plasma gas passageway 503, advances electric inlet pipe subassembly 19 and welds on electrode holder 12, and wet return subassembly 20 welds on nozzle holder 5 water outlet channel 505, adopts the good and firm of welding mode leakproofness.

Under an optional implementation condition, the rear end connecting ends of the protective gas inlet pipe assembly 1, the plasma gas inlet pipe assembly 10, the power inlet water inlet pipe assembly 19 and the water return pipe assembly 20 are all in threaded connection, so that the assembly and disassembly are facilitated and the conductive stability is ensured. The pipe fitting is made of pure copper and has good conductivity. The pipe fitting circumference all overlaps establishes temperature resistant insulating tube, plays protection and insulating effect.

Furthermore, the upper end of the inner cavity of the nozzle holder 5 is provided with a ring of protrusions which abut against the outside of the upper end face of the liner stopper ring 15 for restricting the upward movement of the liner stopper ring 15. The liner stop ring 15 also limits the downward movement of the nozzle carrier 5.

The upper end of the inner cavity of the lining stop ring 15 is also provided with a circle of bulges, and the outer side of the lower end part of the electrode holder 12 is provided with a circle of lugs matched with the bulges of the inner cavity of the lining stop ring 15 to limit the downward movement of the lining stop ring 15. The liner stop ring 15 also limits the upward movement of the electrode holder 12.

Still be equipped with the round arch on the upper end outer wall of electrode holder 12, the inner wall of the upper end of inside lining 14 is equipped with the annular sand grip that corresponds with the arch of the outer wall of the upper end of electrode holder 12, and the bellied up end of the outer wall of the upper end of electrode holder 12 is spacing with the lower terminal surface cooperation of the annular sand grip of the inner wall of the upper end of inside lining 14 for the upper end of inside lining 14 can block and do not slide downwards in the bellied department of the outer wall of the upper end of electrode holder 12.

The structure of the utility model is simplified mainly in the aspect of simplifying the fixing mode of the electrode holder 12, the lining stop ring 15 is limited between the nozzle holder 5 and the electrode holder 12, the lower end of the lining 14 can be limited on the lining stop ring 15, the electrode holder and the cap 11 which are connected by screw threads on the electrode holder 12 are screwed downwards, namely, the electrode holder and the cap 11 press the upper end surface of the lining 14 downwards, and the lining 14 is pressed between the electrode holder and the cap 11 and the lining stop ring 15 under the action of the lining stop ring 15. Wherein because the protruding lug cooperation that the outer wall of the arch that the outer wall set up of 12 upper ends of electrode holder set up and the lower extreme set up, all spacing on 12 outer walls of electrode holder with inside lining 14 and inside lining retaining ring 15 one side, can not slide down, consequently can carry out the screw through electrode holder and cap 11 and tighten and compress tightly inside lining 14 and inside lining retaining ring 15 to also make electrode holder 12 fix at inside lining 14 middle part. Namely, the electrode holder and the cap 11 play a role in fastening the threaded connection and limiting the upper end surface of the lining 14, and limit the upward sliding of the lining 14.

In addition, the inner cavity of the nozzle holder 5 is also provided with a water inlet channel 504, and the inner lining 14 is also internally provided with a water passage 1401 communicated with the water inlet channel 504 of the nozzle holder 5. Therefore, the inner liner 14 is connected at one side end to the upper end surface of the nozzle holder 5, and the water passage 1401 can be communicated with the water inlet passage 504 of the nozzle holder 5. Since one side of the liner 14 is connected to the upper end of the nozzle holder 5 and one side of the liner stopper ring 15 is connected to the nozzle holder 5, the nozzle holder 5 can be held between the liner 14 and the liner stopper ring 15. Therefore, the electrode holder and cap 11 is screwed, and five parts of the electrode holder 12, the electrode holder and cap 11, the liner 14, the nozzle holder 5 and the liner stop ring 15 can be firmly fixed together to form the basic structure of the water-cooled high-power plasma arc cutting torch. The whole structure is compact, the material consumption is reduced, and the cost is reduced.

The lining 14 is made of a temperature-resistant insulating material, so that the insulating function is achieved, and meanwhile, the water passing function is achieved inside the lining. The lining stop ring 15 is made of a temperature-resistant insulating material, and plays an insulating role on one hand and limits the axial movement of the lining 14 on the other hand. The nozzle seat 5 fixes various components inside the water-cooled high-power plasma arc cutting torch on one hand, and plays a role in ventilation and water communication on the other hand. The electrode holder 12 fixes the water needle 13 and the electrode 16, and plays roles of water passing and electric conduction.

Referring to fig. 4, a first water cooling cavity 1301 is formed by a cavity between the outer wall of the water needle 13 and the inner wall of the electrode 16 and the electrode holder 12; a cavity between the inner wall of the inner cover 7 and the outer wall of the nozzle 18 forms a second water cooling cavity 1302; wherein, a circulating cooling water channel is formed between the electricity inlet water pipe assembly 19, the hollow channel 1202, the first water cooling cavity 1301, the water through hole 1201, the water through channel 1401, the water inlet channel 504, the second water cooling cavity 1302 and the water return channel and the water return pipe assembly 20. The water needle 13 can send water to the bottom of the electrode 16 to take away more heat, so that the electrode 16 is cooled better, and the service life of the electrode 16 is prolonged.

The cooling water reaches the bottom of the electrode 16 through the hollow channel 1202 between the electricity inlet pipe assembly 19, the electrode holder 12 and the water needle 13, then passes through the first water cooling cavity 1301, then flows into the water channel 1401 in the liner 14 from the water through hole 1201 of the electrode holder 12, then flows into the water inlet channel 504 of the nozzle holder 5 from the water through hole 1201, then flows into the second cooling cavity to form a circular flow, finally flows into the water outlet channel 505 of the nozzle holder 5, flows out from the water return pipe assembly 20 to take away heat, and mainly cools the electrode 16 and the nozzle 18, so that the service life is prolonged. Meanwhile, cooling water directly reaches the bottom of the electrode 16 through a straight-through method, when the electrode 16 is damaged and replaced, the water needle 13 and cutting waste residues inside the water-cooled high-power plasma arc cutting torch can be directly flushed out through a water flowing method, and the water-cooled high-power plasma arc cutting torch is cleaned, which is not possessed by other water-cooled cutting guns.

It should be further noted that the electrode 16 and the nozzle 18 in this embodiment are core components of a product, and are also wearing parts, which belong to consumables, and the water cooling is mainly to prolong the service life of the electrode 16 and the nozzle 18, and reduce the use cost of a user, because the ionization of the plasma airflow cavity 1601 generates huge heat energy, and the ordinary gas cooling cannot satisfy the cooling effect, and only relies on the water circulation for cooling, which is also a common cooling method for a high-current plasma arc torch.

Referring to fig. 3, a cavity between the inner wall of the lance head fixing cover 4 and the outer wall of the nozzle holder 5 forms a first air cooling chamber 401; the cavity between the inner wall of the outer cover 6 and the outer wall of the inner cover 7 forms a second air cooling cavity 601; a cavity between the outer wall of the inner cover 7 and the inner wall of the outer protective cover 9 forms a third gas cooling cavity 901; wherein the shielding gas inlet pipe assembly 1, the shielding gas channel 502, the first gas cooling cavity 401, the second gas cooling cavity 601, the outer splitter 8 and the third gas cooling cavity 901 form a circulating cooling gas circuit.

Wherein the protective gas enters the protective gas channel 502 of the nozzle seat 5 from the protective gas inlet pipe assembly 1, cools the nozzle seat 5 after passing through the first gas cooling cavity 401, then cools the outer shield 6 and the inner shield 7 after passing through the second gas cooling cavity 601, and finally cools the outer shield 9 after passing through the third gas cooling cavity 901, when the protective gas passes through the outer splitter 8, the protective gas can form vortex gas flow, then flows out from the outlet of the outer shield 9 after being compressed by the outer shield 9, the outlet aperture of the outer shield 9 is larger than that of the nozzle 18, the flowing vortex compressed gas can prevent arc column diffusion to enable the plasma arc to become thinner, the cutting capability is enhanced, and the quality of the cutting end face is ensured. The cutting surface can be cleaned, and the cutting area is protected. At the same time, the heat in the first gas cooling cavity 401, the second gas cooling cavity 601 and the third gas cooling cavity 901 is brought out for cooling. Because the parts through which the shielding gas passes are relatively low in calorific value, the cooling effect can be fully satisfied by cooling.

Referring to fig. 3, a fourth gas cooling chamber 1203 is formed by a cavity between the outer wall of the lower end of the electrode holder 12 and the inner wall of the lower end of the nozzle holder 5; the fourth gas cooling cavity 1203 is communicated with the plasma gas channel 503 on the nozzle holder 5; a plasma airflow cavity 1601 is formed by a cavity between the outer wall of the lower end of the electrode 16 and the inner wall of the nozzle 18; the plasma gas inlet pipe assembly 10, the plasma gas channel 503 are communicated, the fourth gas cooling cavity 1203, the inner shunt 17 and the plasma gas flow cavity 1601 form a complete plasma gas circuit.

Plasma gas in the plasma gas path enters the plasma gas channel 503 of the nozzle seat 5 from the plasma gas inlet tube assembly 10, passes through the fourth cooling space, then cools the nozzle seat 5 and the electrode seat 12, then flows through the inner shunt 17, the inner shunt 17 enables the plasma gas flow to form vortex gas flow, the plasma gas is compressed, then flows into the nozzle 18, enters the plasma gas flow cavity 1601 to be ionized, plasma arc is generated, meanwhile, after the plasma gas passes through the nozzle 18, the gas is compressed for the second time, the gas is fully compressed, and the plasma arc obtains larger energy and speed to be ejected from the nozzle 18.

Optionally, the hollow parts of the inner cavity of the water-cooled high-power plasma arc cutting torch except the circulating cooling water path and the circulating cooling gas path are filled with sealing fixing glue 21. The sealing and fixing glue 21 is mainly used for fixing various components inside the water-cooled high-power plasma arc cutting torch and preventing various assembly parts from loosening after long-time use.

In the utility model, the electrode 16 is an important part for generating plasma arc after plasma gas is ionized, and is also the place with the highest heating, so the cooling effect of the electrode 16 directly influences the service life of the electrode 16 and the cutting performance of the water-cooled high-power plasma arc cutting torch. The water-cooled high-power plasma arc cutting torch is compact, and simultaneously, the length of the electrode 16 can be shortened, the electrode 16 is used as a wearing part, the consumption is high, and the cost can be greatly reduced by shortening the length.

The surface of the inner splitter 17 in the utility model is provided with a plurality of evenly distributed small holes, the small holes of the conventional same product are cylindrical surfaces which are 90 degrees vertical to the cylindrical surface, and the gas can also generate vortex, but the effect is common. The structure of the inner shunt 17 is optimized, the angle between the small hole and the cylindrical surface is 45 degrees, plasma gas can be compressed better to generate vortex, and plasma arc has better penetrating power and generates better cutting end face. Meanwhile, sealing rings are arranged inside and outside the inner shunt 17 and form sealing with the electrode 16 and the nozzle 18, so that gas is enabled to flow out from small holes of the inner shunt 17, and vortex turbulence caused by gas leakage is prevented from affecting the cutting effect. And the inner shunt 17 is made of temperature-resistant insulating material to insulate the electrode 16 from the nozzle 18. The inner shunt 17 is axially restrained by the inner end face of the nozzle 18 and the outer end face of the electrode 16.

According to the utility model, the surface of the outer splitter 8 is provided with a plurality of uniformly distributed small holes, so that the protective gas can generate vortex, and a cutting area can be better protected. The inner cover 7 is insulated from the outer protective cover 9 by using a temperature-resistant insulating material. The outer shunt 8 is axially limited by the outer end face of the inner cover 7 and the inner end face of the outer protective cover 9.

The outer protective cover 9 of the utility model can play a role of secondary compression plasma arc, so that the energy of the arc column is higher, the penetrating power is enhanced, and the nozzle 18 can be prevented from being damaged by double arcs generated by the contact of the nozzle 18 and a workpiece. The outer protective cover 9 is axially limited by the lower end surface of the outer shunt 8 and the inner end surface of the outer cover 6.

The nozzle 18 of the present invention plays the roles of arc striking and compressed gas, and the electrode 16 and the nozzle 18 are concentric when being installed, otherwise, the quality of a cutting section is influenced, double arcs are easy to form, and the nozzle 18 is burnt to cause gun burning. The nozzle 18 is axially limited by the lower end surface of the nozzle holder 5 and the inner end surface of the inner cover 7.

The gun head fixing cover 4 is used for fixing the nozzle seat 5, and simultaneously adopts insulating materials to separate the clamping tube 3 from the outer cover 6, so that the clamping machine can be prevented from being electrified if the water-cooled high-power plasma arc cutting torch leaks electricity.

The inner cover 7 of the present invention is screwed to the nozzle holder 5, on one hand, to limit the axial movement of the nozzle 18, and on the other hand, its inner wall and the outer wall of the nozzle 18 form a second water cooling chamber 1302. The outer cover 6 is connected to the gun head fixing cover 4 through threads, and plays a role in fixing the outer protection cover 9.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the products of the present invention usually put when in use, are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims (10)

1. A water cooled high power plasma arc torch comprising: the device comprises a clamping pipe connecting seat, a clamping pipe, a gun head fixing cover, a nozzle seat, an outer cover, an inner cover, an outer shunt, an outer protective cover, an electrode seat combining cap, an electrode seat, a water needle, a lining stop ring, an electrode, an inner shunt and a nozzle; the upper end and the lower end of the clamping pipe connecting seat are both in threaded connection with a clamping pipe, and the lower end of the clamping pipe positioned below is connected with the gun head fixing cover; the nozzle seat is fixed in the inner cavity of the gun head fixing cover, the electrode seat is arranged in the middle of the nozzle seat, and the upper end of the electrode seat extends out of the nozzle seat and is arranged upwards; the lining stop ring is arranged between the electrode holder and the nozzle holder in a limiting manner, the lining is arranged above the lining stop ring and positioned between the electrode holder and the nozzle holder, and the electrode holder and the cap are in threaded connection with the upper end of the electrode holder and are limited on the upper end surface of the lining; the water needle is arranged in the middle of the electrode seat, the electrode is fixed with the lower end of the electrode seat, and the outer cover is in threaded connection with the lower end of the gun head fixing cover; the outer protection cover is connected with the lower end part of the outer cover, the inner cover is in threaded connection with the outer wall of the lower end of the nozzle seat, one end of the nozzle is limited at the lower end of the nozzle seat, and the other end of the nozzle is limited at the lower end of the inner wall of the inner cover; and the inner shunt is limited between the outer wall of the upper end of the electrode and the upper end part of the inner wall of the nozzle, and the outer shunt is arranged between the middle part of the inner end face of the outer protection cover and the lower end part of the outer end face of the inner cover.

2. The water-cooled high power plasma arc torch as set forth in claim 1, wherein the nozzle holder is provided therein with a shield gas passage, a plasma gas passage, and a water outlet passage, respectively; the upper end surface of the nozzle seat is welded with a shielding gas inlet pipe assembly communicated with the shielding gas channel, the upper end surface of the nozzle seat is welded with a plasma gas inlet pipe assembly communicated with the plasma gas channel, and the upper end surface of the nozzle seat is welded with a water return pipe assembly communicated with the water outlet channel; the protective gas inlet pipe assembly, the plasma gas inlet pipe assembly and the water return pipe assembly are all located in the clamping pipe.

3. The water-cooled high-power plasma arc cutting torch as claimed in claim 2, wherein the upper end of the electrode holder is welded with an electric inlet pipe assembly, and the electrode holder and the middle part of the water needle form a hollow channel suitable for water to enter; the electricity inlet water inlet pipe assembly is located in the middle of the clamping pipe.

4. The water cooled high power plasma arc torch as set forth in claim 1 wherein the nozzle block cavity has a ring of projections on an upper end thereof, the projections abutting an outer side of an upper end of the backing ring for limiting upward movement of the backing ring.

5. The water cooled high power plasma arc torch as set forth in claim 4, wherein the inner cavity of the inner liner stop ring is also provided with a ring of protrusions at the upper end thereof, and the outer side of the lower end of the electrode holder is provided with a ring of protrusions engaging with the inner cavity of the inner liner stop ring to restrict the inner liner stop ring from moving downward.

6. The water-cooled high-power plasma arc cutting torch as claimed in claim 3, wherein the inner cavity of the nozzle holder is further provided with a water inlet channel, and the inside of the liner is further provided with a water channel communicated with the water inlet channel of the nozzle holder; and a water through hole of the electrode holder is formed in the side wall of the middle part of the electrode holder, and the water through hole is communicated with the water through channel of the lining.

7. The water cooled high power plasma arc torch as in claim 6 wherein the cavity between the outer wall of the water needle and the inner walls of the electrode and electrode holder forms a first water cooling chamber; a cavity between the inner wall of the inner cover and the outer wall of the nozzle forms a second water cooling cavity; the water inlet pipe assembly, the hollow channel, the first water cooling cavity, the limber hole, the water passage, the water inlet channel, the second water cooling cavity, and the circulating cooling water path formed between the water return channel and the water return pipe assembly.

8. The water-cooled high power plasma arc torch as set forth in claim 7, wherein the cavity between the inner wall of the torch head retaining cap and the outer wall of the nozzle holder forms a first gas cooling chamber; a cavity between the inner wall of the outer cover and the outer wall of the inner cover forms a second gas cooling cavity; a cavity between the outer wall of the inner cover and the inner wall of the outer protection cover forms a third gas cooling cavity; the shielding gas inlet pipe assembly, the shielding gas channel, the first gas cooling cavity, the second gas cooling cavity, the outer splitter and the third gas cooling cavity form a circulating cooling gas circuit.

9. The water cooled high power plasma arc torch as set forth in claim 8 wherein the cavity between the outer wall of the lower end of the electrode holder and the inner wall of the lower end of the nozzle holder forms a fourth gas cooling chamber; the fourth gas cooling cavity is communicated with the plasma gas channel on the nozzle seat; a cavity between the outer wall of the lower end of the electrode and the inner wall of the nozzle forms a plasma airflow cavity; the plasma gas inlet pipe assembly is communicated with the plasma gas channel, the fourth gas cooling cavity, the inner shunt and the plasma gas flow cavity form a complete plasma gas path.

10. The water-cooled high power plasma arc torch as claimed in claim 9, wherein the hollow portion of the inner cavity of the water-cooled high power plasma arc torch excluding the circulating cooling water path and the circulating cooling water path is filled with a sealing fixing glue.

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