CN206405582U - A kind of plasma arc cutting torch - Google Patents

Abstract

The utility model provides a kind of plasma arc cutting torch, including torch body, electrode and spout, and inner bore of nozzle is designed as into round speaker shape, and there is a centre bore at center, and profile is segmented horn mouth, and main material matter is processed using red copper.It is electrode inside spout, electrode is arranged on electrodes base, and profile middle-end is inwardly recessed, global design expands the space between spout and electrode, it is to avoid the carbonium on electrode is transmitted into above spout at decentralised hole into Pear-Shaped, so as to avoid double arc effects.

Description

A kind of plasma arc cutting torch

Technical field

The utility model is related to arc cutting torch technical field, more particularly to a kind of plasma arc cutting torch.

Background technology

The existing machine of Chinese market is simple with type plasma arc cutting torch design structure, and production process is poor, along with the country There is no the technical college of this respect, lack technological know-how education, though there is manufacturer production, but most of is all the external skill imitated Art, without independent innovational design cutting torch ability, so technology falls behind the epoch always, the cutting torch cutting power made is weak, cuts Cut of poor quality, expendable part service life is short, a series of problems, such as use cost is high.On domestic market electric current reach 120A and more than When torch body inside the air cooling type of cooling inside the water circulation type of cooling, including developed country of U.S. cutting torch must be used maximum Electric current also only reaches 125A.

As shown in figure 1, defect of the plasma arc cutting torch of the prior art due to structure, it sometimes appear that a kind of destruction electricity The phenomenon of the stable burning of arc, at this moment in addition to already present plasma arc minor arc 05, between electrode 01- nozzle 02- workpiece 03 Another side-arcing 04 (or being secondary arc), i.e. minor arc 05 and side-arcing 04 can be produced simultaneously to exist, double arcs are formed and show As.

The harm that double arcing is brought is mainly manifested in following several aspects：

1) stability of plasma arc is destroyed, makes cutting process unstable and cutting can be deteriorated to be seamed into type；

2) double arcs exist simultaneously, and two conductive paths in parallel are formd between electrode and cutting member, minor arc is reduced Electric current, reduces the power of minor arc, makes the penetration reduced capability to cutting member；

3) double arcing is once occur, and nozzle just turns into the electrode of arc in parallel and by arc current in parallel, and minor arc and spray Cold air film potential barrier between nozzle aperture inwall wrecks, and makes nozzle by heat intensive, easily burns out nozzle.

Utility model content

Technical problem to be solved in the utility model is：In order to overcome deficiency of the prior art, the utility model is carried For a kind of plasma arc cutting torch.

The utility model solves its technical problem technical scheme to be taken：A kind of plasma arc cutting torch, including cut Rear portion in torch body, the torch body, which is provided with upper interior insulation body, the upper interior insulation body, is provided with tracheae and striking line, institute The front portion for stating torch body is provided with spout, and the spout is connected by spout base with the outer rim of the upper interior insulation body, and institute State spout base rear portion to be connected with the striking line, the endoporus of the spout includes spherical portion and the cone being sequentially connected from top to bottom Round speaker shape is integrally formed in shape portion, and the center of the spherical portion is provided with centre bore, the upper interior insulation of the spout chassis interior Electrodes base is connected with body, the anterior connection electrode of the electrodes base, the electrode extends forwardly into the spherical of inner bore of nozzle In portion, it is inwardly recessed in the middle part of the electrode outer wall and gourd shape is integrally formed, between the electrode outer wall and the inner bore of nozzle Form plasma gas passage, be provided with center tracheae in the electrodes base, the center tracheae connect the tracheae with it is described Lower interior insulation body is additionally provided between the endoporus of electrode, electrodes base and the spout base, the lower interior insulation body is used to distribute Air-flow and realizing insulate between spout and electrode, and the spout outside mask is provided with protective cover, the anterior spray of the torch body Mouth chassis outer side is provided with copper overcoat, and the protective cover rear portion is fixedly connected with the copper overcoat, and the copper overcoat and protective cover Cooled gas path, the center tracheae, electrodes base, lower interior insulation body and spout are formed between inwall and the spout outer wall Distribution of air flow structure is additionally provided with base, the plasma gas passage and cooled gas path pass through distribution of air flow structure and institute State center tracheae connection.

Due to the adsorption effect of electron ion, so electron ion is integrated in the surface area motion of conductor, easily produce electrode and Positive negative ion between spout produces combination, forms electric arc, and produces double arc effects.Along with internal strong pressure gas fluidity Cause interior pressure seriously to weaken, chance is created to electron ion mobility.Therefore, inner bore of nozzle is designed as round speaker shape, There is a centre bore at center, and profile is segmented horn mouth, and main material matter is processed using red copper.It is electrode, electrode peace inside spout On electrodes base, profile middle-end is inwardly recessed, and global design expands the space between spout and electrode into Pear-Shaped, from And increasing the cold air film potential barrier between arc column and nozzle hole wall, it is to avoid the carbonium on electrode is transmitted at decentralised hole Above spout, so as to avoid double arc effects, it is ensured that the stability of plasma.Lower end plane center is inlaid with a hafnium Silk, main material is processed using red copper.

In addition, the circular indent energy directing gas flow of electrode outer wall is more in electrode surface walking, make at electrode lower end Spout carbonium is easier to be transmitted to the electrode with negative pole, so the successful of enhancing igniting.

It is preferred that, the recessed part of the electrode outer wall is relative with the tapered portion of the spout.Make the cone of the end of spout Shape portion and the recessed aligned in position of electrode outer wall, increase distance between the two, are conducive to increasing the thickness of cold air film potential barrier.

Further, a hafnium filament is inlayed in the electrode front plan center, and the electrode endoporus is blind hole, described blind The bottom in hole, which is provided with the top of taper salient point, the taper salient point, extend into the center tracheal strips, and the blind hole inwall is platform Rank hole, and it is less than openend internal diameter, the endoporus of the one end of the center tracheae close to taper salient point close to the internal diameter of blind via bottom Side wall is provided with boss, and the aperture of the boss is less than in the aperture of center tracheae rear end, the central gas pipe outer wall and electrode The distance between wall is less than the endoporus aperture of the center tracheae.

Taper salient point can increase internal heat dissipating area；The gas ion passed through can be allowed more to touch on the conical surface, strengthened Thermal diffusivity；The air-flow formation diffusivity passed through can be allowed to be oriented to, the air-flow of center tracheae outlet is preferably adjacent to electrode inner wall Walking, strengthens thermal diffusivity.

Stepped hole is designed in electrode interior, center tracheae front end is also small-bore, and gas enters electrode by center tracheae When between the tracheae of center, compressed gas is passed through second-compressed because bore diminishes, strengthen pressed density, make high density gas Volume can produce heat absorption principle during instantaneous expansion in exit so that preferably reduction electrode the lowest point high temperature.

Further, the distribution of air flow mechanism include be arranged in the central gas pipe outer wall annular first flange, set Put the first stomata and the second stomata on electrodes base, the 3rd stomata being arranged on the lower interior insulation body and be arranged on The 4th stomata on spout pan frontward end face, first flange side is abutted with the electrodes base inwall, and described first is convex Edge upper surface, central gas pipe outer wall and electrodes base inwall surround the first cooling gas room, the first flange lower surface, center Tracheae outer wall and electrodes base inwall are surrounded is communicated with described vertically on the first plasma gas room, first flange One cooling gas room and a plurality of air slot of the first plasma gas room；

First groove and second groove of the electrodes base outer wall provided with annular, first groove and the second groove Between form the second flange, second flange side is abutted with wall in the lower interior insulation body, first groove with it is described The second cooling gas room of wall formation, is formed between the spout base inner wall and the external wall of lower interior insulation in lower interior insulation body 3rd cooling gas room, the first stomata two ends connect the first cooling gas room and the second cooling gas room, the 3rd gas Hole two ends connect the second cooling gas room and the 3rd cooling gas room, and the 4th stomata connects the 3rd cooling gas room and cooling Gas passage；Second groove connects with the second plasma gas room of wall formation in the lower interior insulation body, second stomata Lead to the first plasma gas room and the second plasma gas room, the electrodes base front end face is provided with a plurality of rotary pneumatic Groove, the rotation air drain connects the second plasma gas room and plasma gas passage.

Plasma arc gas and cooling gas are produced using a source of the gas simultaneously by distribution of air flow mechanism, can be simultaneously real Now cut and cool.

Further, the aperture of first stomata is more than the aperture of second stomata, the first cooling gas room Volume is less than the volume of the first plasma gas room, and the volume of the first cooling gas room is less than the second cooling gas room, The volume of the second cooling gas room is less than the 3rd cooling gas room, and the volume of the first plasma gas room is more than second The volume of plasma gas room.By controlling the volume of air vent aperture and gas compartment to realize the control of cooling air-flow and plasma air-flow System, so as to realize the stability of plasma arc.In addition, by controlling the control of the volume of air vent aperture and gas compartment to enter one Step compression cooling gas, making nozzle gas, fast cooling is realized in expansion rapidly.

Further, the copper overcoat includes copper cover insulation part and copper overcoat copper piece, and the copper cover insulation part is with stretching out The outer wall of the spout base of torch body is fixedly connected, and described copper overcoat copper piece one end is fixed with the copper cover insulation part outer wall Connection, the other end is fixedly connected by fixed lid with the protective cover.

Further, the joint face of the lower interior insulation body and the electrodes base is provided with the first sealing ring, described lower interior The joint face of insulator and the spout base is provided with the second sealing ring.

A kind of plasma arc cutting torch that the utility model is provided has the advantages that：

(1) protective cover is the accessory specially added for plasma when machine is with automatically working, cut quality it is good Bad to directly depend on spout, it can effectively protect spout to reduce damage, so that protective cover plays a protective role.It can press again in addition Protection gas on the outside of contracting spout, strengthens cutting power.One week aperture of protective cover front end can strengthen thermal diffusivity, extension protective cover Service life.

(2) effect of spout：The ion arc that electrode is produced focuses on to spray by spout central aperture produces high-energy cutting Ion arc, spout internal round speaker shape mainly avoids the swirl gas between electrode from producing double arc effects.Nozzle shape Segmented horn mouth is designed, and can be made the generation compression of protection air-flow evenly on the outside of spout, be gone out so as to have compressed spout The ion arc come, further increases the anti sag property of ion arc, enhances cutting power during work.

(3) electrode is the expendable part of consumption maximum in a whole set of cutting torch, is processed using red copper, red copper material has good Conductive and heat-conducting effect.Internal stepped hole and taper salient point can mainly strengthen bottommost air velocity and area of dissipation, so that The radiating effect of electrode is improved, the service life of electrode is directly extended, has reached more than 3 times of domestic like product life-span. The main swirl gas avoided between spout of profile middle-end Pear-Shaped design produces double arc effects.

(4) center tracheae is made of brass, and its material has hard and heat-resisting quantity, and cooling gas can be made to lead directly to electrode Inside, makes the violent high temperature that its electrode is operationally produced discharge rapidly, so as to improve the service life of electrode.Middle part Air slot can evenly distribute air-flow and be oriented to and improve heat-sinking capability.

(5) fixed lid is screwed in copper overcoat copper piece, is put mainly for protective cover is fixed on outside copper, surface uses annular knurl Technique, greatly strengthen the thermal diffusivity of surface area, so as to extend service life.

(6) copper overcoat is the connector of protective cover and torch body, and the spilehole of copper piece medial launder circle distribution can be effective The cooling extension life-span, and protection gas-bearing formation can be formed, damage torch body when hindering splashing during cutting to rise.Upper portion insulating body Using macromolecule exotic material, mainly for isolating the copper body insulation of exterior part, it is to avoid spout and cut workpiece are direct Short circuit phenomenon, safety can be strengthened again.

(7) vortex design is used inside torch body, the air-flow that electrodes base tracheae can be allowed to flow into inside cutting torch produces whirlpool Stream rotation, makes the penetrability of final produced vortex plasma arc evenly, more straight and upright, stronger.

Brief description of the drawings

The utility model is described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is the principle schematic of double arc effects；

Fig. 2 is the structural representation of the utility model most preferred embodiment；

Fig. 3 is Fig. 2 close-up schematic view；

Fig. 4 is the enlarged diagram of A in Fig. 3；

Fig. 5 is gas flow schematic diagram.

In figure：01st, electrode, 02, nozzle, 03, workpiece, 04, minor arc, 05, side-arcing, 1, protective cover, 2, spout, 3, electricity Pole, 4, center tracheae, 5, fixed lid, 6, copper overcoat copper piece, 7, copper cover insulation part, 8, electrodes base, 9, lower interior insulation body, 10th, spout base, 11, striking line, 12, tracheae, 13, torch body, 14, upper interior insulation body, the 15, second cooling gas room, 16, 3rd cooling gas room, the 17, the 3rd stomata, the 18, first stomata, the 19, first cooling gas room, the 20, first flange, 21, second Stomata, the 22, second plasma gas room, the 23, second sealing ring, 24, spilehole, the 25, the 4th stomata, 26, plasma gas leads to Road, 27, cooled gas path, 28, spilehole, 29, centre bore, the 30, first plasma gas room, the 31, first sealing ring, 32, Hafnium filament, 33, boss, 34, taper salient point, 35, stepped hole.

Embodiment

The utility model is described in detail presently in connection with accompanying drawing.This figure is simplified schematic diagram, only in a schematic way Illustrate basic structure of the present utility model, therefore it only shows the composition relevant with the utility model.

As shown in Figure 2-5, a kind of plasma arc cutting torch of the present utility model, including torch body 13, the torch body Rear portion in 13, which is provided with upper interior insulation body 14, the upper interior insulation body 14, is provided with tracheae 12 and striking line 11, upper interior insulation body 14 use ceramic material, the spout base 10 of main isolation outer layer and the high frequency voltage of electrodes base 8.The torch body 13 Front portion is provided with spout 2, and the spout 2 is connected by spout base 10 with the outer rim of the upper interior insulation body 14, and the spout The rear portion of base 10 is connected with the striking line 11, and the endoporus of the spout 2 includes spherical portion and the cone being sequentially connected from top to bottom Round speaker shape is integrally formed in shape portion, and the center of the spherical portion is provided with upper interior inside centre bore 29, the spout base 10 Electrodes base 8 is connected with insulator 14, the anterior connection electrode 3 of electrodes base 8, the electrode 3 extends forwardly into spout 2 In the spherical portion of endoporus, it is inwardly recessed in the middle part of the outer wall of electrode 3 and gourd shape is integrally formed, the outer wall of electrode 3 is recessed Part is relative with the tapered portion of the spout 2.Electrode 3 is negative pole, can produce plasma arc, and spout 2 is positive pole, can focus on etc. from Subarc high density is ejected.

Formed between the outer wall of electrode 3 and the spout 2 endoporus in plasma gas passage 26, the electrodes base 8 Provided with center tracheae 4, the center tracheae 4 connects the endoporus of the tracheae 12 and the electrode 3, the electrodes base 8 and spray Lower interior insulation body 9 is additionally provided between mouth base 10, the lower interior insulation body 9 is used to distribute air-flow and realizes spout 2 and electrode 3 Between insulate, the outside mask of spout 2 is provided with protective cover 1, and the anterior outside of spout base 10 of the torch body 13 is provided with copper Overcoat, the rear portion of protective cover 1 is fixedly connected with the copper overcoat, and the copper overcoat and the inwall of protective cover 1 and the spout 2 Formed between outer wall on cooled gas path 27, the center tracheae 4, electrodes base 8, lower interior insulation body 9 and spout base 10 Be additionally provided with distribution of air flow structure, the plasma gas passage 26 and cooled gas path 27 by distribution of air flow structure with it is described Center tracheae 4 is connected.

Copper overcoat is screwed on torch body 13, is made up of two parts, and the copper overcoat includes the copper cover insulation part 7 of upper end With the copper overcoat copper piece 6 of lower end, copper cover insulation part 7 and the multiple spileholes of medial launder circle distribution of copper overcoat copper junction 24, upper copper cover insulation part 7 uses macromolecule exotic material, mainly for isolating the copper body insulation of exterior part, it is to avoid Spout 2 and the direct short circuit phenomenon of cut workpiece, can strengthen safety again.The copper cover insulation part 7 is cut with stretching The outer wall of the spout base 10 of torch body 13 is fixedly connected, described one end of copper overcoat copper piece 6 and the outer wall of copper cover insulation part 7 It is fixedly connected, the other end is fixedly connected by fixed lid 5 with the protective cover 1.Protective cover 1 is assemblied in copper overcoat copper piece 6, is protected The uniform one week spilehole 28 in the front end of shield 1, spilehole 28 has the effect of outlet and radiating, and main material is processed using red copper, Fixed lid 5 is screwed in copper overcoat copper piece 6, compresses protective cover 1, and using brass material, surface is processed using annular knurl.

A hafnium filament 32 is inlayed in the front plan center of electrode 3, and the endoporus of electrode 3 is blind hole, the blind hole Bottom be provided with taper salient point 34, the top of the taper salient point 34 extend into the center tracheae 4, and the blind hole inwall is Stepped hole 35, and it is less than openend internal diameter close to the internal diameter of blind via bottom, the center tracheae 4 is close to one end of taper salient point 34 Endoporus side wall be provided with boss 33, the aperture of the boss 33 is less than the aperture of the rear end of center tracheae 4, the center tracheae 4 The distance between outer wall and the inwall of electrode 3 are less than the endoporus aperture of the center tracheae 4.

The distribution of air flow mechanism include be arranged on the outer wall of center tracheae 4 annular first flange 20, be arranged on The first stomata 18 and the second stomata 21 on electrodes base 8, the 3rd stomata 17 being arranged on the lower interior insulation body 9 and set Put the 4th stomata 25 of circle on the front end face of spout base 10, the first stomata 18, the second stomata 21, the 3rd stomata 17 and the 4th Stomata 25 is aperture, and the side of the first flange 20 is abutted with the inwall of electrodes base 8, the upper end of the first flange 20 Face, the outer wall of center tracheae 4 and the inwall of electrodes base 8 surround the first cooling gas room 19, the lower surface of the first flange 20, center The outer wall of tracheae 4 and the inwall of electrodes base 8 are surrounded to be communicated with vertically on the first plasma gas room 30, first flange 20 The a plurality of air slot of the plasma gas room 30 of first cooling gas room 19 and first；The outer wall of electrodes base 8 is provided with The first groove and the second groove of annular, form the second flange, second flange between first groove and the second groove Side is abutted with the lower inwall of interior insulation body 9, and the second flange side is provided with inwardly recessed, recessed interior provided with the first sealing Circle 31, first groove and the lower second cooling gas room 15 of the inwall of interior insulation body 9 formation, the inwall of spout base 10 The 3rd cooling gas room 16 is formed between the lower outer wall of interior insulation body 9, the two ends of the first stomata 18 connection first is cooled down The cooling gas room 15 of gas compartment 19 and second, the cooling gas of the second cooling gas room of the two ends of the 3rd stomata 17 connection 15 and the 3rd Body room 16, the 4th stomata 25 connects the 3rd cooling gas room 16 and cooled gas path 27；Second groove with it is described Lower the second plasma gas room 22 of the inwall of interior insulation body 9 formation, second stomata 21 connects the first plasma gas room 30 are provided with a plurality of rotation air drain with the second plasma gas room 22, the front end face of electrodes base 8, and the rotation air drain connects Lead to the second plasma gas room 22 and plasma gas passage 26.The lower interior insulation body 9 and the spout base 10 Joint face is described recessed interior provided with the second sealing ring 23 provided with recessed.

The aperture of first stomata 18 is more than the aperture of second stomata 21, the body of the first cooling gas room 19 Product is less than the volume of the first plasma gas room 30, and the volume of the first cooling gas room 19 is less than the second cooling gas room 15, the volume of the second cooling gas room 15 is less than the 3rd cooling gas room 16, the body of the first plasma gas room 30 Volume of the product more than the second plasma gas room 22.

Arrow represents the flow direction of gas in Fig. 4.

Cold air film potential barrier is increased by the matching design of electrode 3 and the structure of spout 2, the stabilization of plasma arc is improved Property, it is to avoid double arc effects, in addition, the design and the cooperation of air vent aperture and gas building volume that pass through the inner hole structure of electrode 3 Second-compressed is realized to compressed gas, so as to improve cooling-down effect, the service life of electrode 3 and spout 2 is extended；By above-mentioned The improvement of compages, current product HC-1303 cutting torches, actual use electric current is cooled down up to 130A, and using internal air cooling Mode, enhances ease of use significantly.And HC-1303 cutting torch cutting products quality has reached U.S.'s imported with original packaging cutting torch Cut quality, the expendable part life-span is even more catch up with and surpass U.S.'s imported with original packaging cutting torch expendable part life-span 1.2 times, so as to improve work effect The uniformity of rate and high-quality cutting products, it is cheap to add domestic expendable part, greatly improves terminal user and uses sexual valence Than.

Using it is above-mentioned according to desirable embodiment of the present utility model as enlightenment, pass through above-mentioned description, related work Personnel can carry out various changes and amendments in the range of without departing from the utility model completely.This utility model Technical scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.

Claims (7)

1. a kind of plasma arc cutting torch, it is characterised in that：Including torch body (13), the rear portion in the torch body (13) is set Have and tracheae (12) and striking line (11), the torch body are provided with upper interior insulation body (14), the upper interior insulation body (14) (13) front portion is provided with spout (2), and the spout (2) is connected by the outer rim of spout base (10) and the upper interior insulation body (14) Connect, and spout base (10) rear portion is connected with the striking line (11), the endoporus of the spout (2) include from top to bottom according to The spherical portion and tapered portion of secondary connection, the center of the spherical portion are provided with centre bore (29), spout base (10) inside Electrodes base (8), the anterior connection electrode (3) of the electrodes base (8), the electrode (3) are connected with upper interior insulation body (14) In the spherical portion for extending forwardly into spout (2) endoporus, be inwardly recessed in the middle part of electrode (3) outer wall, electrode (3) outer wall with Formed between spout (2) endoporus and center tracheae (4), institute are provided with plasma gas passage (26), the electrodes base (8) State center tracheae (4) and connect the tracheae (12) and the endoporus of the electrode (3), the electrodes base (8) and spout base (10) lower interior insulation body (9) is additionally provided between, the lower interior insulation body (9) is used to distribute air-flow and realizes spout (2) and electricity Insulated between pole (3), spout (2) outside mask is provided with protective cover (1), the anterior spout base of the torch body (13) (10) outside is provided with copper overcoat, and protective cover (1) rear portion is fixedly connected with the copper overcoat, and the copper overcoat and protective cover (1) between inwall and the spout (2) outer wall formed cooled gas path (27), the center tracheae (4), electrodes base (8), Distribution of air flow structure, the plasma gas passage (26) and cooling are additionally provided with lower interior insulation body (9) and spout base (10) Gas passage (27) is connected by distribution of air flow structure with the center tracheae (4).

2. plasma arc cutting torch as claimed in claim 1, it is characterised in that：The recessed part of electrode (3) outer wall and institute The tapered portion for stating spout (2) is relative.

3. plasma arc cutting torch as claimed in claim 1, it is characterised in that：Electrode (3) the front plan center edge An embedding hafnium filament (32), electrode (3) endoporus is blind hole, and the bottom of the blind hole is provided with taper salient point (34), the taper It is extend at the top of salient point (34) in the center tracheae (4), the blind hole inwall is stepped hole (35), and close to blind via bottom Internal diameter be less than openend internal diameter, the center tracheae (4) close to one end of taper salient point (34) endoporus side wall provided with convex Platform (33), the aperture of the boss (33) is less than the aperture of center tracheae (4) rear end, center tracheae (4) outer wall and electrode (3) the distance between inwall is less than the endoporus aperture of the center tracheae (4).

4. plasma arc cutting torch as claimed in claim 3, it is characterised in that：The distribution of air flow mechanism is described including being arranged on Annular first flange (20) on center tracheae (4) outer wall, the first stomata (18) and the second gas being arranged on electrodes base (8) Hole (21), the 3rd stomata (17) being arranged on the lower interior insulation body (9) and it is arranged on spout base (10) front end face The 4th stomata (25), first flange (20) abuts with the electrodes base (8) inwall sideways, first flange (20) Upper surface, center tracheae (4) outer wall and electrodes base (8) inwall surround the first cooling gas room (19), first flange (20) lower surface, center tracheae (4) outer wall and electrodes base (8) inwall surround the first plasma gas room (30), described first A plurality of the leading of the first cooling gas room (19) and the first plasma gas room (30) is communicated with flange (20) vertically Air drain；

First groove and second groove of electrodes base (8) outer wall provided with annular, first groove and the second groove Between form the second flange, second flange side is abutted with lower interior insulation body (9) inwall, first groove and institute State lower the second cooling gas room (15) of interior insulation body (9) inwall formation, spout base (10) inwall and the lower interior insulation The 3rd cooling gas room (16) is formed between body (9) outer wall, the first stomata (18) two ends connect the first cooling gas room (19) and the second cooling gas room (15), the 3rd stomata (17) two ends connect the second cooling gas room (15) and the 3rd and cooled down Gas compartment (16), the 4th stomata (25) connects the 3rd cooling gas room (16) and cooled gas path (27)；Described second Groove and the lower second plasma gas room (22) of interior insulation body (9) inwall formation, the second stomata (21) connection are described First plasma gas room (30) and the second plasma gas room (22), electrodes base (8) front end face is provided with a plurality of Air drain is rotated, the rotation air drain connects the second plasma gas room (22) and plasma gas passage (26).

5. plasma arc cutting torch as claimed in claim 4, it is characterised in that：The aperture of first stomata (18) is more than described The aperture of second stomata (21), the volume of the first cooling gas room (19) is less than the body of the first plasma gas room (30) Product, and the volume of the first cooling gas room (19) is less than the second cooling gas room (15), the second cooling gas room (15) volume is less than the 3rd cooling gas room (16), and the volume of the first plasma gas room (30) is more than the second plasma The volume of gas compartment (22).

6. the plasma arc cutting torch as described in claim any one of 1-5, it is characterised in that：It is exhausted that the copper overcoat includes copper overcoat Edge part (7) and copper overcoat copper piece (6), spout base (10) of the copper cover insulation part (7) with stretching out torch body (13) Outer wall is fixedly connected, and described copper overcoat copper piece (6) one end is fixedly connected with copper cover insulation part (7) outer wall, and the other end leads to Fixed lid (5) is crossed to be fixedly connected with the protective cover (1).

7. plasma arc cutting torch as claimed in claim 6, it is characterised in that：The lower interior insulation body (9) and the electrode bottom The joint face of seat (8) is provided with the first sealing ring (31), the joint face of the lower interior insulation body (9) and the spout base (10) It is provided with the second sealing ring (23).