CN112118663A - Novel direct current plasma torch - Google Patents
Novel direct current plasma torch Download PDFInfo
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- CN112118663A CN112118663A CN202011122971.5A CN202011122971A CN112118663A CN 112118663 A CN112118663 A CN 112118663A CN 202011122971 A CN202011122971 A CN 202011122971A CN 112118663 A CN112118663 A CN 112118663A
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- cooling shell
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- 238000002679 ablation Methods 0.000 claims abstract description 32
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 91
- 239000007789 gas Substances 0.000 claims description 67
- 239000000110 cooling liquid Substances 0.000 claims description 25
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000002175 menstrual effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 239000007772 electrode material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/28—Cooling arrangements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
- H05H1/3436—Hollow cathodes with internal coolant flow
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
Abstract
The invention discloses a novel direct current plasma torch, which comprises a front electrode, a rear electrode and a working gas distributor, wherein one end of the front electrode is connected with one end of the working gas distributor, the other end of the working gas distributor is connected with one end of the rear electrode, the front electrode and the rear electrode are respectively connected with two poles of a direct current plasma power supply, an auxiliary gas inlet channel is arranged on the front electrode, and the auxiliary gas inlet channel is positioned at the upstream of a main ablation area of the front electrode. The invention can obtain the electrode life which is more excellent than that of the prior cold cathode plasma torches with lower additional cost.
Description
Technical Field
The invention relates to a plasma torch, in particular to a novel direct current plasma torch, and belongs to the technical field of plasma.
Background
The cold cathode direct current plasma torch is a key device for plasma fusion gasification and hazardous waste treatment. A typical cold cathode plasma torch configuration includes front and rear electrodes that are connected to respective poles of a plasma torch power supply, with an arc formed between the front and rear electrodes. Working gas (such as dry air, nitrogen, argon and the like) is introduced through a gas distributor between the two electrodes and enters the space between the front electrode and the rear electrode in a spiral form to maintain stable combustion of the electric arc. Meanwhile, the working gas flowing through the front electrode is heated by the arc to form a high-temperature jet for heating the processing object.
Under the drive of electromagnetic force and pneumatic force, the front electrode arc root and the back electrode arc root respectively reciprocate on the inner surfaces of the front electrode and the back electrode to form a main ablation area. Due to the high-energy heat flow at the arc root, local high temperature is formed on the main ablation area and near the arc root attachment area, and the electrode material is rapidly ablated. In the plasma torch using air as working gas, the surface of the electrode is subjected to double actions of oxidation and high temperature, and the ablation is more severe. Therefore, the electrode of the industrial plasma torch is continuously worn, and the electrode of the life prolonging technology is not considered, and the general life is only in the order of tens of hours.
To extend electrode life and electrode replacement cycle, it is desirable to retard the ablation rate of the electrode surface. However, the current common methods for prolonging the service life of the electrode do not consider directly improving the cooling effect of the main ablation area so as to reduce the surface temperature of the electrode.
The first existing mainstream method is to improve the high temperature resistance of the electrode material to prolong the service life of the electrode. This method leads to an increase in the cost of the electrodes, with a limited increase in amplitude;
in the second existing method, the arc root is driven by a specific driving force, so that the moving speed of the arc root is increased, and the time for attaching the arc root to the fixed position of the electrode is reduced. A complex magnetic field driving or pneumatic driving mechanism is required to be arranged, the structural complexity of the plasma torch is increased, and the later maintenance is not facilitated.
Disclosure of Invention
The invention aims to provide a novel direct current plasma torch, which can reduce the problem of electrode materials in a main ablation area by a method with lower cost so as to prolong the service life of an electrode.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a novel direct current plasma torch, its characterized in that: the plasma torch comprises a front electrode, a rear electrode and a working gas distributor, wherein one end of the front electrode is connected with one end of the working gas distributor, the other end of the working gas distributor is connected with one end of the rear electrode, the front electrode and the rear electrode are respectively connected with two poles of a direct current plasma power supply, an auxiliary gas inlet channel is arranged on the front electrode, and the auxiliary gas inlet channel is positioned at the upstream of a main ablation area of the front electrode.
Further, supplementary inlet channel contains a plurality of supplementary trompils, and every supplementary trompil all sets up along the tangent line direction of front electrode inner wall circular cross-section, and the front electrode inner wall is run through to the one end of supplementary trompil, and the outer wall of front electrode is run through to the other end of supplementary trompil, and a plurality of supplementary trompils are along the equidistant distribution of circumference of front electrode and the tangent line distribution direction of a plurality of supplementary trompils is unanimous with working gas distributor's the distribution direction that admits air.
Further, the auxiliary opening is in the axial direction of the front electrode, and the tangential angle of the auxiliary opening and the tangent of the circular section of the front electrode is 4 degrees.
Further, the auxiliary gas of the auxiliary gas inlet channel adopts air, inert gas or mixed gas of air and inert gas.
Further, the flow rate of the auxiliary gas of the auxiliary menstrual channel is 10-20% of the flow rate of the working gas distributor.
Further, the front electrode contains detachable front electrode and fixed front electrode, the auxiliary air inlet channel is arranged on the fixed front electrode, an external thread is arranged at one end of the detachable front electrode, one end of the fixed front electrode is connected with the working gas distributor, an internal thread is arranged on the inner wall of the other end of the fixed front electrode, and the other end of the detachable front electrode inserted into the fixed front electrode is in threaded connection with the fixed front electrode.
Furthermore, a sealing ring is arranged at the connecting part of the detachable front electrode and the fixed front electrode.
Furthermore, a front electrode cooling device is arranged on the outer side of the front electrode, the front electrode cooling device comprises a front electrode cooling shell, the front electrode cooling shell is sleeved on the outer side of the front electrode, two ends of the front electrode cooling shell are hermetically connected with two end portions of the front electrode, a cooling channel is arranged on the inner side of the front electrode cooling shell, a cooling liquid inlet is formed in one side of the front electrode cooling shell, the cooling liquid inlet is located at one end of the front electrode cooling shell, a cooling liquid outlet is formed in the other side of the front electrode cooling shell, and the cooling liquid outlet is located at the other end of the front electrode cooling shell.
Furthermore, be provided with supplementary air inlet on the front electrode cooling shell, supplementary air inlet is along the radial setting of front electrode cooling shell, and supplementary air inlet one end runs through the outer wall of front electrode cooling shell, and the supplementary air inlet other end runs through the inner wall of front electrode cooling shell and corresponds the trompil intercommunication with supplementary inlet channel's supplementary, and supplementary air inlet is separated with cooling channel through tubular structure in the cooling channel position.
Furthermore, a rear electrode cooling device is arranged on the outer side of the rear electrode, the rear electrode cooling device comprises a rear electrode cooling shell, the rear electrode cooling shell is sleeved on the outer side of the rear electrode, the two ends of the rear electrode cooling shell are hermetically connected with the end portions of the two ends of the rear electrode, a cooling channel is arranged on the inner side of the rear electrode cooling shell, a cooling liquid inlet is formed in one side of the rear electrode cooling shell, the cooling liquid inlet is located at one end of the rear electrode cooling shell, a cooling liquid outlet is formed in the other side of the rear electrode cooling shell, and the cooling liquid outlet is located at the other end of the rear electrode cooling shell.
Compared with the prior art, the invention has the following advantages and effects:
1. the auxiliary air inlet continuously washes the main ablation area of the electrode, quickly takes away heat transmitted to the surface of the electrode by the arc root, and cools the electrode together with the electrode cooling liquid, so that the surface temperature of the electrode is reduced, the high-temperature ablation of the electrode is inhibited, and the service life of the electrode is prolonged. The electrode ablation rate was reduced by about 30% compared to the conventional structure based on heat transfer calculations;
2. the auxiliary air inlet forms a cold air film on the surface of the main electrode ablation area, and the cold air film hinders the convection heat transfer of high-temperature working gas to the main electrode ablation area, so that the heat efficiency of the electric arc is obviously improved while the cooling load of the electrode is reduced. According to calculation, the thermal efficiency of the plasma torch can be improved from 70% to more than 80% only by adopting an auxiliary air inlet structure for the front electrode;
3. the invention can be easily matched with various existing technical means for prolonging the service life of the electrode, and can obtain the service life of the electrode which is more excellent than that of various existing cold cathode plasma torches with lower additional cost.
Drawings
Fig. 1 is a schematic view of a novel dc plasma torch of the present invention.
Fig. 2 is a cross-sectional view taken along a-a of a novel dc plasma torch of the present invention.
Fig. 3 is an enlarged view of a portion of a novel dc plasma torch of the present invention.
Detailed Description
To elaborate on technical solutions adopted by the present invention to achieve predetermined technical objects, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, it is obvious that the described embodiments are only partial embodiments of the present invention, not all embodiments, and technical means or technical features in the embodiments of the present invention may be replaced without creative efforts, and the present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.
As shown in fig. 1, the novel dc plasma torch of the present invention comprises a front electrode 1, a rear electrode 2, and a working gas distributor 3, wherein one end of the front electrode 1 is connected to one end of the working gas distributor 3, the other end of the working gas distributor 3 is connected to one end of the rear electrode 2, the front electrode 1 and the rear electrode 2 are respectively connected to two poles of a dc plasma power supply 4, an auxiliary gas inlet channel 5 is disposed on the front electrode 1, the auxiliary gas inlet channel 5 is located upstream of a main ablation region 6 of the front electrode 1, the auxiliary gas inlet channel 5 needs to be disposed near the upstream of the main ablation region, and it is difficult to achieve the technical effects of the present invention if the auxiliary gas inlet channel 5 is disposed far away. In the prior art, auxiliary gas inlet passages are sometimes provided in some plasma torches, but the auxiliary gas inlets are generally located at the trailing end of the trailing electrode or at an intermediate insertion section of the plurality of leading electrodes, rather than in the upstream vicinity of the main ablation region. And thus a cold air film cannot be formed. In addition, the main purpose of adding auxiliary air intake in the prior art is to adjust the aerodynamic force applied to the arc column through multi-path air intake so as to control the range of the main ablation area of the arc root; or the restraint effect on the arc column is improved through the cooling effect of the auxiliary gas, so that the arc column is stabilized on the electrode axis.
The plasma torch is a reversed polarity torch, the front electrode is connected with the negative electrode of the power supply, and the rear electrode is connected with the positive electrode of the power supply. By properly setting the auxiliary air inlet, a cold air film attached to and continuously scouring the surface of the electrode is formed on the main ablation area of the electrode, so that the following two effects are achieved:
firstly, the surface of a main ablation area in contact with an arc root is directly cooled through auxiliary air inlet flowing through the surface of an electrode, so that the cooling effect of the electrode is obviously improved;
secondly, the high-temperature gas heated in the plasma torch is isolated from the main ablation area. This will fundamentally improve the electrode cooling effect, reducing the electrode surface temperature and ablation rate.
The front electrode 1 and the rear electrode 2 are made of a material having high electrical and thermal conductivity, such as high purity copper or a copper-based alloy. Working gas is supplied to the torch by a working gas distributor 3 and auxiliary gas is supplied to the primary electrode ablation zone 6 by an auxiliary gas feed channel 5. The front electrode 1, the rear electrode 2 and the arc 14 form a complete conducting loop.
As shown in fig. 2, the auxiliary air inlet channel 5 includes a plurality of auxiliary openings 7, each auxiliary opening 7 is arranged along the tangential direction of the circular cross section of the inner wall of the front electrode 1, one end of the auxiliary opening 7 penetrates through the inner wall of the front electrode 1, the other end of the auxiliary opening 7 penetrates through the outer wall of the front electrode 1, the auxiliary openings 7 are distributed along the circumferential direction of the front electrode 1 at equal intervals, and the tangential distribution directions of the auxiliary openings 7 are consistent with the air inlet distribution direction of the working gas distributor 3. The auxiliary opening 7 is in the axial direction of the front electrode 1, and the tangential angle of the auxiliary opening 7 to the tangent of the circular cross section of the front electrode 1 is 4 deg.. The auxiliary gas of the auxiliary gas inlet channel 5 adopts air, inert gas or mixed gas of air and inert gas. In order to prevent interference of the auxiliary intake air with the working intake air, the flow of the auxiliary gas in the auxiliary menstrual channel 5 is 10-20% of the flow of the working gas in the working gas distributor 3. According to the structure of the embodiment, the auxiliary air inflow is properly adjusted, so that the auxiliary air inflow can uniformly cover the main ablation area of the front electrode, the main ablation area is effectively isolated from the working gas heated to high temperature, and multiple effects of reducing the surface temperature of the front electrode, improving the thermal efficiency of the plasma torch, prolonging the service life of the electrode and the like are achieved. The auxiliary gas flowing into the front electrode 1 from the auxiliary gas inlet channel 5 is compressed by the gas entering the front electrode 1 from the working gas distributor 3, forming a cold gas film above the main ablation area 6 of the electrode. The cold gas film can isolate the main ablation area 6 from the high-temperature working gas entering the interior of the torch and continuously cool the surface of the electrode, so that the surface temperature and the ablation rate of the main ablation area are reduced, and the service life of the electrode is effectively prolonged finally. The arc root can not reach the auxiliary opening, so that the local cooling effect can not be influenced even if the cooling liquid does not flow through the auxiliary opening; meanwhile, as the auxiliary air inlet is tangential and the flow is obviously smaller than that of working gas, the axial flow field and the flow velocity near the surface of the front electrode cannot be obviously changed, and the influence on the main ablation area 6 of the arc root on the front electrode 1 is small.
An auxiliary air intake structure may also be added to the rear electrode. The gas inlet location is located upstream of the primary ablation zone (closer to the primary gas inlet of the working gas distributor 3). The tangential direction of the auxiliary inlet air coincides with the main cyclone ring of the working gas distributor 3. The specific arrangement mode is similar to the front electrode air inlet structure, and the detailed description is omitted here.
The front electrode cooling device is arranged on the outer side of the front electrode 1 and comprises a front electrode cooling shell 11, the front electrode cooling shell 11 is sleeved on the outer side of the front electrode 1, two ends of the front electrode cooling shell 11 are hermetically connected with end portions of two ends of the front electrode 1, a cooling channel is arranged on the inner side of the front electrode cooling shell 11, a cooling liquid inlet is formed in one side of the front electrode cooling shell 11 and is located at one end of the front electrode cooling shell 11, a cooling liquid outlet is formed in the other side of the front electrode cooling shell 11 and is located at the other end of the front electrode cooling shell 11. Be provided with auxiliary air inlet 12 on the front electrode cooling shell 11, auxiliary air inlet 12 is along the radial setting of front electrode cooling shell 11, and auxiliary air inlet 12 one end runs through the outer wall of front electrode cooling shell 11, and the auxiliary air inlet 12 other end runs through the inner wall of front electrode cooling shell 11 and corresponds the trompil intercommunication with auxiliary inlet channel 5's supplementary, and auxiliary air inlet 12 passes through tubular structure and cooling channel at the cooling channel position and separates.
The rear electrode cooling device is arranged on the outer side of the rear electrode 2 and comprises a rear electrode cooling shell 13, the rear electrode cooling shell 13 is sleeved on the outer side of the rear electrode 2, two ends of the rear electrode cooling shell 13 are hermetically connected with end portions of two ends of the rear electrode 2, a cooling channel is arranged on the inner side of the rear electrode cooling shell 13, one side of the rear electrode cooling shell 13 is provided with a cooling liquid inlet, the cooling liquid inlet is located at one end of the rear electrode cooling shell 13, the other side of the rear electrode cooling shell 13 is provided with a cooling liquid outlet, and the cooling liquid outlet is located at the other end of the rear electrode cooling shell 13. Thus, the cooling liquid flows through the cooling channels of the front electrode cooling device and the rear electrode cooling device respectively, and sufficient cooling capacity is provided for the front electrode and the rear electrode.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A novel direct current plasma torch, its characterized in that: the plasma torch comprises a front electrode, a rear electrode and a working gas distributor, wherein one end of the front electrode is connected with one end of the working gas distributor, the other end of the working gas distributor is connected with one end of the rear electrode, the front electrode and the rear electrode are respectively connected with two poles of a direct current plasma power supply, an auxiliary gas inlet channel is arranged on the front electrode, and the auxiliary gas inlet channel is positioned at the upstream of a main ablation area of the front electrode.
2. A novel dc plasma torch as claimed in claim 1, wherein: the auxiliary gas inlet channel comprises a plurality of auxiliary openings, each auxiliary opening is arranged along the tangential direction of the circular cross section of the inner wall of the front electrode, one end of each auxiliary opening penetrates through the inner wall of the front electrode, the other end of each auxiliary opening penetrates through the outer wall of the front electrode, the auxiliary openings are distributed at equal intervals along the circumferential direction of the front electrode, and the tangential distribution directions of the auxiliary openings are consistent with the gas inlet distribution direction of the working gas distributor.
3. A novel dc plasma torch as claimed in claim 2, wherein: the auxiliary opening is in the axial direction of the front electrode, and the tangential angle between the auxiliary opening and the tangent line of the circular section of the front electrode is 4 degrees.
4. A novel dc plasma torch as claimed in claim 1, wherein: the auxiliary gas of the auxiliary gas inlet channel adopts air, inert gas or mixed gas of air and inert gas.
5. A novel dc plasma torch as claimed in claim 1, wherein: the flow rate of the auxiliary gas of the auxiliary menstrual channel is 10-20% of the flow rate of the working gas distributor.
6. A novel dc plasma torch as claimed in claim 1, wherein: the front electrode contains can dismantle front electrode and fixed front electrode, and supplementary inlet channel sets up on fixed front electrode, and the one end of dismantling front electrode is provided with the external screw thread, and the one end and the working gas distributor of fixed front electrode are connected, are provided with the internal thread on the inner wall of the other end of fixed front electrode, and the other end and the fixed front electrode threaded connection of fixed front electrode are inserted to the one end of dismantling front electrode.
7. A novel dc plasma torch as claimed in claim 6, wherein: and a sealing ring is arranged at the connecting part of the detachable front electrode and the fixed front electrode.
8. A novel dc plasma torch as claimed in claim 1, wherein: the front electrode cooling device is characterized in that a front electrode cooling device is arranged on the outer side of the front electrode, the front electrode cooling device comprises a front electrode cooling shell, the front electrode cooling shell is sleeved on the outer side of the front electrode, the two ends of the front electrode cooling shell are hermetically connected with the end parts of the two ends of the front electrode, a cooling channel is arranged on the inner side of the front electrode cooling shell, a cooling liquid inlet is formed in one side of the front electrode cooling shell, the cooling liquid inlet is located at one end of the front electrode cooling shell, a cooling liquid outlet is formed in the other side of the front electrode cooling shell, and the cooling liquid outlet is located at.
9. A novel dc plasma torch as claimed in claim 8, wherein: be provided with supplementary air inlet on the front electrode cooling shell, supplementary air inlet is along the radial setting of front electrode cooling shell, and supplementary air inlet one end runs through the outer wall of front electrode cooling shell, and the supplementary air inlet other end runs through the inner wall of front electrode cooling shell and corresponds the trompil intercommunication with supplementary inlet channel's supplementary, and supplementary air inlet is separated with cooling channel through tubular structure in the cooling channel position.
10. A novel dc plasma torch as claimed in claim 1, wherein: the rear electrode cooling device is arranged on the outer side of the rear electrode and comprises a rear electrode cooling shell, the rear electrode cooling shell is sleeved on the outer side of the rear electrode, the two ends of the rear electrode cooling shell are hermetically connected with the end parts of the two ends of the rear electrode, a cooling channel is arranged on the inner side of the rear electrode cooling shell, a cooling liquid inlet is formed in one side of the rear electrode cooling shell, the cooling liquid inlet is located at one end of the rear electrode cooling shell, a cooling liquid outlet is formed in the other side of the rear electrode cooling shell, and the cooling liquid outlet is located at the other end of the rear electrode cooling shell.
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| CN202011122971.5A CN112118663A (en) | 2020-10-20 | 2020-10-20 | Novel direct current plasma torch |
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| CN202011122971.5A CN112118663A (en) | 2020-10-20 | 2020-10-20 | Novel direct current plasma torch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112738938A (en) * | 2020-12-30 | 2021-04-30 | 中国航天空气动力技术研究院 | High thermal efficiency tubular electric arc heater |
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