DE7148539U - PLASMA RAY GENERATOR - Google Patents

Description

18.596 / 97

RKAGAKU KENKYUSHO

No. 2-1, Hirosawa, Wako-shi, Saitama-ken, Japan

"Plasma jet generator"

summary

An improved plasma jet generator having at least two is disclosed Plasma jet torches and an additional pührungszusirrichtung, which is firmly with the burners is connected to the anode foot of a non-transferred To fix the plasma jet. This special arrangement allows a suitable selection of the point of the anode foot of the plasma jet with respect to the Cathode spot of the same, whereby a high-voltage plasma beam is realized will. The new arrangement also prevents local erosion on the electrode parts where the anode base and cathode spot are located, by a noble gas, which enables the main arc column to heat a highly concentrated, active gas directly.

The invention relates to a plasma jet generator having a plurality of plasma jet torches that are able to function independently as plasma jet torches of even polarity.

This will keep the burner wall free from the damage that occurs would if one were to use the Brenner wall as a. negative electrode used if the torch is used in the reverse polarity form. The from Plasma jets emitted by these plasma jet burners will meet in the inner space of an additional guide device which is directly connected to the connected to the burners. A main arc can be formed in the electrically conductive space by applying a voltage from a main power source to one electrode of each plasma jet torch, which is used as a positive or negative electrode, and the supplied gas is heated up by the main sheet and then passed through the guide device accordingly. ι

A plasma jet generator (hereinafter abbreviated to PJG) was often ;

used in cutting, welding, coating and other operations. The basic structure of a PJG (see US Pat. No. 2,06,124) was originally developed by Union Carbide Corporation and numerous improvements have been proposed. With these PJGs. The factors for determining the electrical characteristics are, for example, the following: gas flow rate, gas composition, caliber size, electrode spacing and connection values. Έε should be noted that the arc voltage also depends on these invoices. ι

The effectiveness of heating gas generally results from the following equation:

The efficiency of heating gas [\)

Arc χ current (I) - torch voltage (V) consumption (L +) (1)

Arc voltage (V) χ current (I) - 3 -

- ,, IB ·· »Hf»
(· I · ( f (2) J - - 3 -
ι f provided that Burner consumption (L ,.) = K χ current (I) + Heat conduction to the housing wall (L ^.)
•

where K is a constant.

By replacing equation (2) with the corresponding expression of
Equation (1), the following equation can be obtained:

H ■ ι - ir- -

The last expression can be neglected because of its smallness and accordingly it is clear that the efficiency with the arc chipping
voltage will increase. ,

A common method of increasing the tension is to increase the tension
Increase in the turbulence component of the gas flow when passing through the
Burner.

Another means of increasing the arc tension is the creation of: set parts, which are electrically isolated from both the anode and; also from the cathode, and which are in the flow path of the gas. If !

however, when relying on these means, arc tensions for the

even values of gas flow rates and electric current do not have one:

critical specific value can be raised without causing damage

borrowed side effects, such as double arches, damage to:

j Mouthpiece opening and derivation or instability of the arch column. The PJGs proposed so far. still have flaws like complexity
under construction, operational difficulties and narrow bandwidth for electrical
Current changes, gas flow changes and other factors.

- 4-

An object of this invention is to provide an improved P. J. Gs., which is characteristic of the high voltage and, accordingly, the greatly improved efficiency of the heating gas, with little or no Electrode consumption occurs. !

Another object of the invention is to provide a novel one High voltage P. J.Gs., bpi which is a high density active gas directly from the arc column can be heated. This direct heating of concentrated Active gas by means of the arc column was previously considered impossible.

Further features and advantages of the invention emerge from the

standing description of the in the accompanying schematic drawings shown examples. Herein is:

1 shows an embodiment of the P. J. Gs. According to the invention in a cross-sectional view and an associated electrical circuit,

FIG. 2 is a view similar to FIG. 1, but with a different embodiment for a concentrated active gas and an associated electrical circuit,

FIGS. 3 - 8 show various additional guide devices, partly in section for the P. J. G. according to Fig. 1,

Fig. 9 is a view similar to Fig. 2 except for the structure of the guide attachment;

FIG. 10 is a cross-sectional view of one embodiment of this inventions: tion with two positive plasma jets burners and a nega- \ tive plasma jet burner, and an associated switching j

i circle; and

11 is a cross-sectional view of various shapes of the bright white Part of the plasma flame at the outlet.

1 shows a primary PJG according to the invention, which consists of a positive plasma jet burner A _1, a negative plasma jet burner B and an additional guide device C. The positive plasma jet burner A has a cathode rod 1 and at least two sockets 2, 3 on that for. Cathode rod are arranged concentrically. The second socket 2 has a curved mouthpiece opening 4. A gas like argon, helium or other noble gases are in the form of streams 7 and 8

entered from the inlets 5 and 6 in the annulus between

\ Cathode and first socket 2 is formed and in the space between the first socket 2 and the second socket 3. The negative plasma jet torch B has a cathode rod 9 and a socket 11 which is arranged concentrically to the cathode. The socket 11 has a bow mouthpiece. opening 10. A noble gas 13 is via the inlet 12 into the annular

j space entered between the cathode 9 and the socket Ii.

The additional guide device C has two inlets 15 and 16 and one Outlet 17 on. These inlets are arranged so that when the additional guide device is connected to the positive and negative burners is, these inlets work so that the gas flows from the burners to the intersection of the central axis of these burners, whereas the outlet is arranged to function to allow the resulting gas flow to flow outward from the intersection flow.

It should be noted that the guide attachment is connected to at least one socket (the socket 3 of the positive plasma jet torch Ln Fig. 1), through an insulator 18 made of dielectric material, and that a gas 20 from the inlet 19 into the annular

Space is introduced by the insulator 18 at its sealing part ge j

forms is. The cathode holders 50, 51 and the sockets 2, 3, 11 and the j j Additional guide device C are secured by suitable means, not shown,

ι water-cooled and are integrated via insulators 52 from, for example, j

Bakelite in a completely airtight manner. i

An auxiliary power source 21 comprises a high frequency oscillator for arcing. The negative terminal of the power supply 21 is with the;

Cathode 1 of the positive radiation burner A is connected via an electrical switch 22, while the positive terminal is connected to the socket 2 of the burner A. ·

Accordingly, the negative terminal of the main power source 23 is with a High frequency oscillator for arcing is connected to the cathode 9 of the negative plasma jet torch B, and the positive terminal of the main power source is connected to the socket 2 of the torch A. The positive '

Terminals of the power sources 21, 23 are connected to the socket 11 via a switch 24. The j PJG so connected to the associated circuit will function as follows:

1) Gas 7, 8 is supplied to the positive plasma jet torch A and then the high-fi-equence oscillator of the auxiliary power source 21 is set by closing: of switch 22 turned on. {

As a result, an auxiliary arc 25 is formed and finally becomes a Plasma jet flame formed, which extends from the mouthpiece opening for the bow 4 into the additional guide device C.

2) Gas 13 is entered and then the high frequency oscillator becomes the Main power source 23 put into operation by closing switch 24.

This creates an arc 26, and then a plasma jet flame is created.

forms, which extends from the arch mouthpiece opening 10 b ± s in the additional management facility C.

3) After making the plasma jet flames of straight polarity like this and meet at intersection 14, switch 2 4 is opened. Then a "hairpin-shaped" main arch is formed and the Plasma jet flame 28 extends from outlet 17 of the guide attachment C to the outside.

The supply of the gas stream 20 from the inlet 19 of the guide device C can be started before or after the above operation 3. The hairpin-shaped one Arch can open wide and as a result the curved leg of the arch approaches one side of the inlet 15 of the attachment, whereby the wall of the inlet 15 is excessively heated. Partly because of it, and partly because of the ion injection into the inlet wall it is very likely that a xathode stain has formed on the inlet wall will. That is the reason for double arcing. The supply of the gas stream 20 is initially useful to make a wide opening of the "hairpin-shaped" To avoid arching and also to prevent ions from entering the inlet wall, which ultimately creates the possibility of double arching is excluded.

The high-voltage P. J.G. is able to have a stable Form an arc with an arc tension at least twice as high as the arc tension of a well-known P. J.Gs. given electrical Current and given gas flow rate.

example 1
The characteristics of an apparatus according to the invention according to FIG. 1 are:

Diameter of the mouthpiece opening of the socket 3

2 mm

Diameter of the inlet 15 of the F üurungszusati-a direction

Diameter of the inlet 16 of the accessory device

Diameter of the passage 30 of the guide device

Distance from intersection 14 to the end of socket 2

Distance from intersection 14 to cathode tip 9

3 mm 0 2 mm 0 5 mm 0 mm mm

0.2 l / min. 0.4 l / min. 3. 0 l / min. 0.2 l / min. 20 A.

Gas flow rate 7 (argon) Gas flow rate 8 (argon) Gas flow rate 13 (argon) Gas flow rate 20 (argon) arc flow

A plasma jet flame part as long as possible was formed and the Arc voltage was not less than 76 volts. (The arc voltage in a conventional plasma jet torch is 30 volts or less with the same current and the same amount of flow).

Referring to Fig. 2, a P.J.G. according to the invention is described which is able to heat a concentrated (90 percent or more) chemically active gas which acts on the electrode material, such as oxygen or air, this is done directly through a Arch pillar.

Despite the constantly increasing demand for this possibility of direct heating of an active gas in the fields of application of the chemical Reactions, coating, cutting and other operations

since the appearance of the P. J.Gs., one could so far the task of this er- | finding not solve. j

f · \

In the device of FIG. 2, the positive plasma jet burner is A ahn- j borrowed from that of the apparatus of Fig. 1. The negative plasma jet torch B j has an extra socket 34 with a mouthpiece opening 34 'and extra in' leave 35, 36 for gas 37, 38 when using the negative plasma jet;

i burner B of FIG. 1 compares. The additional guide device C is on!

I attached to the socket 34 via an electrical insulator 18. Corresponding ·

this change is the positive end point of the main power source 23 with the

Sockets 11 and 34 and the additional guide device C connected. !

This device can be operated as follows:

1) Argon is entered in the form of a gas stream 7 and then the

j switch 22 closed to operate the high frequency oscillator

to initiate the auxiliary power source 21, which leads to the auxiliary arc 25. then
the plasma jet flame is ejected from the mouthpiece opening 4 and extends into the main passage 30. In addition, is
Argon in the form of gas streams 8 and 20 was introduced.

2) Argon is entered in the form of gas streams 13, 37 and 38 and
then switches 24, 24 'and 24 "are closed so that the;

Main power source 23 has a direct current voltage and a high frequency voltage to the burner B, as well as to the additional guide device C, whereby a first, untransferred sheet 26

ι arises. Then the switch 24 is opened, whereby the arch column;

is converted into the second, untransferred sheet 26 '. then
the switch 24 'is opened, which in turn turns the arch column into
a third, untransferred sheet 26 "is transformed. Then
interrupt the gas supply 13 to the cathode and the switch 24 "

- 10 -

is opened, creating the main arch column 27.

3) The switch 22 is opened to erase the sheet 25 and at the same time the gas supply 7 to the cathode is interrupted. Finally, the gas streams 20 and 38 are converted from argon to air or oxygen;

switched. So a highly concentrated, active gas plasma jet can be obtained will. !

This operation can be designed fully automatically, i.e. with an and an exhibition using a "pipe system that has pre-adjusted needle valves and solenoid valves.

Example 2

The data of the device according to Fig. 2 are:

Inlet diameter 15 or 16 for

the additional guide device C 3 mm 0; Diameter of the gas duct of the guide
additional equipment 5 mm 0; Mouthpiece opening diameter 34 '
the socket 34 2 mm 0 j Distance from intersection 14 to the end
area of the socket 2 18 mm Distance from intersection 14 to the cathode
tip 9 I.
1
34 mm Gas flow rate 8 (argon)
Gas flow rate 20 (oxygen)
Gas flow rate 37 (argon) 0.3 l / min.
0.2 l / min.
0.3 l / min. - 11 -

714853927.ft.72

Gas flow rate 38 (oxygen) arc voltage

5 l / min. 2OA.

A plasma flame of 90% oxygen concentration was obtained and

the arc voltage was no less than 115 volts. The replacement of the Oxygen through air caused it to rise to 35 volts.

A mixture of a higher active gas can be done if one has the cooling capacity of the jacks and by increasing the arc current.

With regard to the directional stability improvement of the plasma jet flame and at the same time, with a view to increasing the efficiency of the heating gas, the inventors conducted experiments on a number of guide attachments as follows:

The additional guide device according to FIG. 3 is the same as the corresponding one Part of the apparatus of Figure 1, except for the fluted portion "a" on the downstream side, which makes the end of the outlet 17 quite comes close to the "hairpin" arch column. In this modification the plasma jet flame 28 is removed from the central axis 29 of the outlet 17 and the orientation is changed with the amount of gas flow, or with the current value.

Fig. 4 shows further changes to the additional guide device of Fig. 3, ι consisting in that the gas channel around the intersection 14 at the upstream. side is expanded while keeping the intersection at the outlet the same j to the outlet of the guide device according to FIG. 1 or 3. In this j

Fall was the plasma jet flame 28 on the central axis 29 of the outlet 17 arranged.

FIG. 5 shows an additional guide device corresponding to FIG. 1, as well as j changed as in Fig. 4. This change was made in a corresponding manner

- 12 -

the plasma jet flame 28 is arranged on the central axis 29 of the outlet IT and what was better, the length of the bright white portion of the flat flow portion of the plasma jet flame - was increased by about 50%. This indicates that the discharge of the plasma jet flame is considerable was reinforced. A similar result was obtained with respect to on the additional guide device whose gas duct has been modified ^, as indicated in dashed line at 31.

6 shows a further modification of the additional guide device according to FIG Fig. 5, in that the part "b" indicated in dashed lines has been removed. In this case, the rolling flow of the plasma jet flame 28 is with respect to the central axis 29 of the outlet 17

diverted.

The additional guide devices according to Figures 3, 4, 5 and 6 were checked for the same values of gas flow rate and current.

The results of these experiments indicate that:

1) the acceptance of part "a" from Ei.de of the additional device according to Fig. useful to direct the plasma jet flame along the central axis 29 of the guide channel;

2) the cross-sectional expansion of the guide channel according to FIG. 4, the guide device the alignment of the plasma jet flames can be carried out;

3) the expansion of the guide channel in the guide device beyond of the grooved zone "a" of Fig. 5 is useful to reduce the plasma jet flame loss to reduce that would otherwise occur at the TeU corresponding to the grooved TeU "a" in Figure 3;

- 13 -

L _

j 4) if the cross-sectional expansion extends far into the inlet of the guide ' facilities according to Fig. 6 extends, the alignment:

effect disappear with the plasma flame on the center line.

From the results of the above-mentioned experiments, the inventors came out to the following conclusions:

j The superstructures of the guide devices. according to Fig. 4 and 5 are useful to direct dv.ii disturbing flow, resulting from the gas streams, consisting of the inlets in the j Führungseinrich ⁺ ung arrive, so that the resuitieren-

de flow coincides with the centerline of the guide facility.

As can be seen in Fig. 6, the position of the outlet with respect to the arch column is critical and it is necessary that part of the "hairpin-shaped" ι arc or at least the sharply curved part of the hairpin in the J Muzzle opening appears for the following reasons:

! first, the entry of a portion of the arc column into the mouthpiece opening will cause the temperature of the gas therein to rise and

j accordingly, the gas volume will expand, which will eventually lead to leads to an increase in the flow resistance of the mouthpiece, which is useful for increasing the conductivity of the mouthpiece. Then the steering effect of the wall of the opening, which is unfavorable because of the heat loss, as can be seen in the device according to FIG. 1, can be reduced, and the output of the plasma jet flame will be improved because the "hairpin" shape of the arc is approximately half the total energy of the arc or lies on the central axis of the mouthpiece opening Heating up the gas.

7 and 8 show further changes to the guide attachment. The additional guide device of FIG. 7 is intended in particular for cutting. In this example, space 32 is where the "hairpin" enters.

- 14 -

is designed larger than the outlet 17 of the guide device, '

which has, for example, 1 mm (J, because otherwise the "hairpin" \ j I

j does not fit into the mouthpiece opening, i

• -

FIG. 8 shows a change in the additional guide device according to FIG. 4. In this change, a blind bore 33 is made in the wall of the guide channel j opposite the inlet 15 of the additional guide device. So \

was the directness of the laminar flow of the plasma jet emitted by the Opening 17 is ejected with a relatively small diameter, significantly improved. !

How clear from the results of the experiments on the modifications ^! 3-6 results, the 'directness of the plasma jet flame can be improved and at the same time the efficiency of the heating gas can be increased by extending the cross-section of the guide channel over the length of the channel beyond the intersection of the two central axes of the positive' and negative plasma jet burner enlarged towards the outlet. I.

Fig. 9 shows a P.J.G. which is equivalent to the embodiment according to Fig. 2, but modified by replacing the additional guide device of Fig. 4 or 5 by the corresponding part of the apparatus of Fig. 2. This ■

i modification 2 was treated with the apparatus according to Fig. with the following results. ■

compared: j

Example 3

Operating conditions: gas flow 8 gas flow 37 gas flow 7 gas flow 13 Gas stream 38

Argon 0.3 l / min.

Argon 0.3 l / min, none none

Oxygen 4 l / min.

- 15 -

Gas flow 20 bow voltage Bow strpm

Oxygen 1 l / min. 95 V
50 A.

P. J.G. according to Fig. 2

Diameter d, d of the inlets 15, Diameter d "of the outlet

Distance £ from intersection 14 to outlet 17

d _{1 #} d ₂ = 3.0 ram d = 5. 0 mm 0

Jt = 8.5

mm

The plasma jet flame extended over 25 to 30 cm and it deviated approximately 2 degrees from the central axis 29.

P. J.G. according to FIG. 9

Diameter d d of the inlets 15,

Diameter d of the outlet

Diameter d of the guide channel

Distance Λ \ from intersection 14 to outlet 17

* ^d 2 ^{= 3} * °

dg = 5.0 mm 0

d. = 7.0 mm 0 4

* · , = 4.5 mm

0
2 = 4.0 mm

The plasma jet flame extended over 35 to 50 cm on the central axis 29.

The mouth part was converted into the two-step shape according to FIG. 7.

The following arc voltages were at different diameters d and d of inlet 16 and outlet 17 obtained and the plasma jet flame output, which was suitable for cutting has been significantly improved.

- 16 -

3.0 mm 0 3.0 min. 0 2. 0 mm 0 i. 5 mm 0 2. 0 miu 0 1.0 mm 0

Bow tension Pressure in the feeling "
addition (single print) 95 V 110 V 2
0: 1 kg / cm 120 V 1.0 kg / cm '.

Example 4

Betriebssbt JUNGEN Gas flow 38 gas flow 20

Oxygen 12 l / min. Oxygen 3 l / min.

(The flow rates of the other gas flows corresponded to those of example 3.),

Arc voltage 130 V

BogenstiOm 50 A

P. J. G. of Fig. 2

The dimensions of the apparatus were identical to those of the example 3. The glowing part of the flame consisted of a disturbed flow approximately 2 cm in length and the plasma jet flame deviated about 3 degrees or more from the central axis.

PJG of Figure 9 ;

The particular dimensions of the device were identical to those of Example 3. The glowing part of the flame consisted of one disturbed stream of about 3, 5 cm in length and the plasma jet flame was straightened out. j

The deviation and length of the plasma jet flame is a direct one Measure of the degree of heating efficiency at a certain operating

- 17 -

■ condition. In view of this, it is evident that the effect of the special Structure of the additional guide device according to Fig. 4 or 5 is remarkable is to improve the efficiency of the heating gas. In addition, the possibility of d- ~ ÄnHpnmtr Ηρτ ··! Ηΐ! Ί? Ρτηρησ ° η ri ° =

j gas stream 20 within a wide range of operation of the device.

As can be seen from the above, the inventive P. J.G. a single mouthpiece opening and at least one anode electrode, which differs significantly from a conventional P.J.G., which uses the inner wall of the mouth opening as the anode electrode used.

The benefits of using multiple positive plasma torches are:

first of all, of course, the anode input power can be uniformly applied to as many Parts are distributed, such as positive plasma jet burners are present, thus damaging the mouth opening due to local heat concentration avoids, as was previously the case. In addition, the adverse effect of the gas injection via the inlet 15 on the main arc can be avoided can be significantly reduced.

Fig. 10 shows a P. J.G. with a negative plasma jet torch and two positive plasma jet torches, which are arranged symmetrically to the negative torch. This device corresponds to that of FIG. 1, except from the guide option. A single switch 24 is provided in each negative torch to create the plasma jet flame. Although two HiKs power sources 21 are shown in the drawing, a single power supply can be used by appropriately changing the relevant electrical connection as the device is not to be used for the positive radiation burner at the same time.

- 18 -

'-2.I

The main arc is in operation by the positive plasma jet torch generated, to which the switch 24 is connected (right burner in the drawing), in the same way as in the apparatus of Fig. 1, When the main arch is made this way, an auxiliary arch is inserted through the Another positive plasma jet torch is made (left torch in the drawing), and then a main arc is made in it. After it came about of the main arch on the left, the switch 22 is opened and then the supply of the gas flow 7 is interrupted. the Flow rates of gas 7 and 8, such as argon, are suitably selected, for example 0.2 l / min. So the main arch 27 finally becomes final manufactured.

In a particular embodiment of the device, the total was electric current 40 A and the arc voltage was 73 V.

Fig. 11 shows the shapes of the cross sections of the glowing nuclei of the plasma = jet flames emitted from main channel 30 when gas is emitted from either the right or left of positive plasma jet burners in an equal pressure, which is equalized at the center of the main channel. In the drawing, the outer circle 39 is the Wall of the main channel of the auxiliary guide device and the direction of the gas supply via the positive plasma jet burner is indicated by the arrow. The hatched part 40 is the cross section of the glowing part or center of the plasma jet flame in the outlet 17.

Figures 11-1 refer to a single positive plasma jet torch and shows the eccentric position of the glowing core, the cross-section of which is elliptical. This phenomenon becomes one with the plasma jet flame conventional burner observed.

Fig. 11 - Π relates to the use of two positive plasma jets. burners and shows the centered position of the glowing core 40, whose

- 19 -

Cross-section is an ellipse.

Fig. 11-III relates to the angular arrangement of three positive plasma jet torches each 120 apart and shows the centered days of the glowing core 40, the cross-section of which is almost circular.

Fig. 11 / IV relates to the angular arrangement of four positive plasma jet burners at a distance of 90 degrees and shows the centered position of the glowing core, the cross-section of which approaches a circle.

The arrangement of the glowing core in the exact center of the mouth opening according to FIGS. 11-11, III and IV means the alignment of the plasma jet in the central axis of the main duct, thereby reducing the thermal loss that would be caused if the plasma jet flame would touch the canal wall. Centering the plasma jet flame About a plurality of positive plasma jet burners is to Verbes = the efficiency of the device is favorable.

For the sake of simplicity, the invention has so far been referenced on non-referenced P. J. Gs. described with straight polarity, it should however, it should be noted that the P.J.G.s. reversed polarity are also useful in this invention. It is generally assumed that the

Use of oxygen or air in the transferred P. J.Gs. the ;

j will increase cutting speed on steel or aluminum blades. j

However, in order to prevent damage to the electrode part of a conventional P. J.Gs. to avoid (more specifically, to have a service life equal to that To achieve a device that uses argon) it is necessary to J to use a noble gas in the form of a non-transferred operation and | then add oxygen or air as a substitute for the noble gas after j Transition of the arch to the work piece. This process is too cumbersome and j makes the device practically useless. According to the invention, this error is overcome by creating a first, non-transferred plasma jet

- 20 -

with the aid of an auxiliary power source and then through a transferred plasma jet between the cathode rod and the workpiece with the aid of the main power source.

So far, the invention has been described as using plasma jets of even polarity, but it is evident to the person skilled in the art that a P. J. G. according to the invention also use reversed polarity ia nn. With others Words of the invention P. J. G. is independent of the type of Plaema beam not damaged. The embodiments disclosed herein have the axis of the positive plasma jet torch and the axis of the negative Plasma jet burner in a diagonal arrangement. When cutting a workpiece from dielectric material, such as concrete, when it is not transferred Operation or when cutting a conductive material such as aluminum, iron and other metals in transferred operation two plasma-jet burners arranged at an angular distance of 60 °, which initially made it possible for the hairpin arch towards the outlet approached, which would increase the thermal energy on the workpiece -and Secondly, the outlet for the workpiece became accessible, because the plasma jet units cause little or no obstruction to the work- !piece. Of course, the angle at which the two plasma jet units can be arranged, arbitrarily adapted to the requirements.

The P. J.G. has been applied in numerous industrial fields since it became known in the professional world and the invention extends the field of application with regard to the bandwidths that result from economic and technical perspectives.

Claims (5)

18.596 / 97 P-a-t ~ e - «- t s ρ r ü c h e: 1. A plasma jet generator, characterized in that it has at least two plasma jet burners, capable of functioning as a positive burner and a negative burner, a guide accessory that is compatible with the aforesaid Burn? is firmly connected and by at least one of the said burners is dielectrically separated and means for supplying gas into the interior at the connection between said guide attachment and the mentioned a 3renner. 2. A plasma jet generator according to claim 1, characterized in that that the positive burner has a cathode;:;. tab un i at least has two sockets, and in that the negative burner has one Having cathode rod and a socket, wherein the guide attachment has a channel, at least two inlets and an outlet, wherein the called channel opens at the outlet and the mouthpiece opening of the negative burner via one of the inlets and the mouthpiece openings of the positive burner connects through the other inlets. 3. A plasma jet generator according to claim 1, characterized in that that said additional guide device is dielectrically isolated from each individual burner. 4. Plasma jet generator according to claim 1 or 3, characterized in that each burner has a cathode rod and at least two Has sockets. 5. A plasma jet generator according to claim 2, characterized in that -2- indicates that the connected canal is beyond the intersection of the central axes the burner has a reduced cross-section on the downstream side.