CN109982499B - Arc striking device and method for plasma arc - Google Patents
Arc striking device and method for plasma arc Download PDFInfo
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- CN109982499B CN109982499B CN201910014810.5A CN201910014810A CN109982499B CN 109982499 B CN109982499 B CN 109982499B CN 201910014810 A CN201910014810 A CN 201910014810A CN 109982499 B CN109982499 B CN 109982499B
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- module
- arc
- optical transceiver
- arc striking
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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
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
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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
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
- H05H1/3405—Arrangements for stabilising or constricting the arc, e.g. by an additional gas flow
Abstract
The invention discloses an arc striking device of plasma electric arc, comprising: the plasma power supply cabinet comprises an internal power supply module, an alternating current-direct current conversion module, a boosting module, a pulse generation module and an internal optical transceiver module, wherein the internal power supply module, the alternating current-direct current conversion module, the boosting module and the pulse generation module are sequentially connected; the direct current signal generated by the internal power supply module is processed by the alternating current-direct current conversion module, the boosting module and the pulse generation module in sequence under the instruction of the built-in optical transceiver module, converted into a high-frequency pulse high-voltage signal required by arc striking, and output to an arc striking electrode of the plasma torch to finish the arc striking. The invention has high success rate of arc striking, strong adaptability to the ion torch and low requirement on wiring, and can be simultaneously suitable for the arc striking of the plasma torch with transferred arc and non-transferred arc. The invention also discloses an arc striking method of the plasma arc.
Description
Technical Field
The invention relates to the technical field of plasma arc generation, in particular to an arc striking device and method of a plasma arc with high requirements on system insulation.
Background
With the continuous widening of the application field of the plasma technology, the requirement on the stability of the operation of the plasma is higher and higher, wherein the improvement of the success rate of the plasma arc striking is particularly important. The existing arc striking technology of plasma arc adopts single-phase alternating current power supply of a power grid, jing Pingbo reactors, isolation transformers, arc striking cabinets, plasma generator cathodes, plasma generator anodes and the like to achieve arc striking (for example, refer to Chinese invention patents CN201721369713 and CN 201820548927).
In the prior art, the electric arc and the arc striking energy are supplied by a power grid, and the electric isolation of the electric arc and the arc striking device from the power grid is realized by adopting a transformer. Moreover, reduced insulation of the striking electrode (cathode or anode) from earth in arc applications affects the stability of the striking high voltage and thus the success rate of striking. Such as: in the production of the conductive powder, metal powder can be attached to the vicinity of the electrode, so that the insulation resistance between the arc striking electrode or between the arc striking electrode and the ground is reduced, and the arc striking success rate is greatly reduced.
Therefore, it is necessary to provide a technology for completely isolating the arc striking energy from the power grid, so as to generate a stable high voltage and improve the success rate of arc striking under the condition that the insulation between the arc striking electrode or the arc striking electrode and the ground is reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the arc striking device and the method for the plasma arc, so that the arc striking success rate is high, the adaptability is strong, and the device and the method are convenient and easy to use when the plasma arc is ignited.
In order to realize the purpose, the technical scheme of the invention is as follows:
the invention provides an arc striking device of plasma electric arc, which is arranged outside a plasma power supply cabinet, and comprises: the plasma power cabinet comprises an internal power module, an alternating current-direct current conversion module, a boosting module, a pulse generation module and a built-in optical transceiver module, wherein the internal power module, the alternating current-direct current conversion module, the boosting module and the pulse generation module are sequentially connected, and the built-in optical transceiver module is respectively connected with the alternating current-direct current conversion module, the boosting module and the pulse generation module and is also connected with the plasma power cabinet; the plasma power supply cabinet sends an arc striking signal to the built-in optical transceiver module when arc striking is needed, the direct current signal generated by the internal power supply module is converted into an alternating current signal through the alternating current-direct current conversion module in sequence under the instruction of the built-in optical transceiver module, converted into a high voltage signal through the boosting module, converted into a high frequency pulse high voltage signal needed by arc striking through the pulse generation module, and then output to an arc striking electrode of the plasma torch to finish arc striking.
Furthermore, the built-in optical transceiver module is connected with the alternating current-direct current conversion module, the boosting module and the pulse generation module through communication signal lines.
Further, the built-in optical transceiver module is connected with the plasma power cabinet through an external optical transceiver module arranged outside the arc striking device.
Furthermore, the external optical transceiver module is arranged inside or outside the plasma power cabinet.
Furthermore, the external optical transceiver module is connected with the plasma power cabinet by a communication signal line, and the external optical transceiver module is connected with the internal optical transceiver module by a wireless communication mode.
Further, the internal power module is a storage battery.
Further, the storage battery is connected with an external power supply through a charging interface for charging.
Further, the battery is disconnected from an external power source at the time of arc striking.
Further, the pulse generation module is connected with an arc ignition electrode of the plasma torch through a high-voltage output port.
The invention also provides an arc striking method of the plasma arc, which uses the arc striking device of the plasma arc and comprises the following steps:
charging the internal power supply module through an external power supply;
after charging is finished, the connection between the internal power supply module and an external power supply is disconnected, and the complete isolation from a power grid is ensured;
when arc striking is needed, firstly, an arc striking high-voltage preparation signal is sent to the built-in optical transceiver module through the external optical transceiver module in a wireless communication mode, and after the built-in optical transceiver module receives the signal, an instruction is sent to the alternating current-direct current conversion module and the boosting module to convert a direct-current voltage signal generated by the internal power supply module into an alternating-current high-voltage signal so as to complete arc striking high-voltage preparation;
then, the built-in optical transceiver module feeds back an arc striking high-voltage ready signal to the external optical transceiver module, and the external optical transceiver module transmits the arc striking high-voltage ready signal to the plasma power cabinet, and at the moment, the plasma power cabinet is in an arc striking standby state;
and then, according to the requirement, the plasma power supply cabinet sends an arc striking signal to the external optical transceiver module, the external optical transceiver module transmits the signal to the internal optical transceiver module, and the internal optical transceiver module immediately sends an instruction to the pulse generation module to convert the high-voltage signal into a high-frequency pulse high-voltage signal which is directly added between the cathode and the arc striking anode of the plasma torch so as to complete arc striking.
The invention has the following innovation points:
(1) The plasma arc ignition device is separated from the plasma power cabinet and is arranged near the plasma torch, so that the adverse effect caused by wiring between the plasma power cabinet and the plasma torch can be reduced. Such as: the influence of the distributed capacitance between lines or between the lines and the ground on the high-voltage shunt.
(2) The power supply system-storage battery in the plasma arc ignition device is completely isolated from the external power grid during arc ignition, so that stable high voltage can be generated under the condition that the insulativity between an arc ignition electrode or between the arc ignition electrode and the ground is poor, and the arc ignition success rate is improved.
(3) The plasma power supply cabinet and the arc striking device realize control signal transmission in a contactless mode of optical communication, so that an information channel is established between the plasma arc striking device and the plasma power supply cabinet which are independent of each other.
Compared with the prior art, the invention also has the following advantages:
(1) In equipment for producing conductive powder, for example, the success rate of arc striking can be increased from 50% to over 90%.
(2) The arc striking device has strong adaptability to the ion torch.
(3) The requirements for wiring between the plasma power cabinet and the plasma torch are significantly reduced.
(4) Can be simultaneously suitable for the arc striking of the plasma torch with transferred arc and non-transferred arc.
Drawings
Fig. 1 is a schematic structural diagram of an arc striking device for a plasma arc according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of the structure of the transfer arc in accordance with a preferred embodiment of the present invention.
FIG. 3 is a schematic diagram of the structure of a non-transferred arc in accordance with a preferred embodiment of the present invention.
Detailed Description
The following provides a more detailed description of embodiments of the present invention, with reference to the accompanying drawings.
In the following detailed description of the embodiments of the present invention, in order to clearly illustrate the structure of the present invention and to facilitate explanation, the structure shown in the drawings is not drawn to a general scale and is partially enlarged, deformed and simplified, so that the present invention should not be construed as limited thereto.
In the following description of the present invention, please refer to fig. 1, in which fig. 1 is a schematic structural diagram of an arc striking device for a plasma arc according to a preferred embodiment of the present invention. As shown in fig. 1, an arc striking device 7 for a plasma arc of the present invention is provided outside a general plasma power cabinet 6, is independent from the plasma power cabinet 6, and is installed near a plasma torch. In particular, the arc ignition device 7 may comprise: an internal power module 71, an ac/dc conversion module 72, a boosting module 73, and a pulse generation module 74, which are connected in sequence, and a plurality of functional modules such as a built-in optical transceiver module 76, which is connected to the ac/dc conversion module 72, the boosting module 73, and the pulse generation module 74, respectively.
Please refer to fig. 1. The built-in optical transceiver module 76 is connected to the plasma power cabinet 6. The arc starting device 7 of the plasma arc of the present invention may further include an external optical transceiver module 5 disposed outside the arc starting device 7. The internal optical transceiver module 76 can be connected to the plasma power cabinet 6 through the external optical transceiver module 5. The external optical transceiver module 5 may be disposed inside the plasma power cabinet 6, or may be disposed outside the plasma power cabinet 6. The internal optical transceiver module 76 and the external optical transceiver module 5 may be implemented by using the internal optical transceiver 76 and the external optical transceiver 5.
One end of the external optical transceiver 5 is connected with the plasma power cabinet 6 through a signal wire, so that communication interconnection is realized. The internal optical transceiver 76 and the external optical transceiver 5 can transmit wireless signals in an optical communication mode, so that an information channel is established between the plasma arc ignition device 7 and the plasma power cabinet 6 which are independent of each other.
The plasma arc ignition device 7 is separated from the plasma power supply cabinet 6 and is arranged near the plasma torch, so that the influence caused by wiring between the ion power supply cabinet 6 and the ion torch can be reduced. Such as: the influence of distributed capacitance between lines or between the lines and the ground on high-voltage shunt.
The internal power supply module 71 may provide power to the arc ignition device 7. As a preferred embodiment, the internal power module 71 may employ a storage battery 71. The battery 71 can be connected to an external power source (grid) for charging via the charging interface 70, and can be disconnected from the external grid after charging is completed. The charging interface 70 may have a power display function.
The AC-DC conversion module 72 may employ a DC/AC converter 72; the booster module 73 may employ a booster 73; the pulse generation module 74 may employ a pulse generator 74. The built-in optical transceiver 76 and the DC/AC converter 72, the booster 73 and the pulse generator 74 in the plasma arc ignition device 7 can be connected through signal lines, respectively, to achieve communication interconnection.
When arc ignition is needed, the plasma power supply cabinet 6 sends an arc ignition signal, and the arc ignition signal is transmitted to the built-in optical transceiver 76 through the external optical transceiver 5. The direct current signal generated by the storage battery 71 is processed by the DC/AC converter 72, the booster 73 and the pulse generator 74 in sequence under the instruction of the built-in optical transceiver 76, and finally becomes a high-frequency pulse high-voltage signal required for arc striking, and can be connected with an arc striking electrode of the plasma torch through a high-voltage output port 75 connected with the pulse generator 74, so that the high-frequency pulse high-voltage signal is output to the arc striking electrode of the plasma torch to complete arc striking.
The storage battery 71 is completely isolated from an external power supply when arc striking, namely, the storage battery is disconnected from the external power supply, so that stable high voltage can be generated under the condition that the insulativity between an arc striking electrode or between the arc striking electrode and the ground is poor, and the arc striking success rate is improved.
An arc striking method of a plasma arc according to the present invention will be described in detail with reference to the following embodiments and the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic diagram of a structure applied to arc transfer according to a preferred embodiment of the present invention. As shown in fig. 2, an arc striking method of a plasma arc according to the present invention may use the arc striking apparatus 7 for a plasma arc, and the arc striking method may include:
first, the external power supply charges the battery 71 through the charging interface 70. After charging is completed, the battery 71 can be manually disconnected from the external circuit to ensure complete isolation from the power grid.
The 12V20AH storage battery 71 can be used for arc striking more than hundred times, the device 7 only works during arc striking, and the device 7 can be charged when not working, so that the normal use is not influenced. The arc ignition device 7 is normally operated in a standby state in which the arc ignition device 7 has only a light receiving operation function (the storage battery 71 can be standby for 160 days in theory when fully charged).
When the arc striking is required, first, the external optical transceiver 5 connected to the power supply cabinet 6 sends an "arc striking high voltage ready" signal to the internal optical transceiver 76 in the arc striking device 7. Upon receiving the signal, the built-in optical transceiver 76 sends a command to the DC/AC converter 72 and the booster 73 to convert the DC voltage from the battery 71 into an AC high voltage. At this point, arc initiation high pressure preparation is complete.
The voltage value can be determined according to the requirement, and in this embodiment, 10000-30000V is preferred.
Then, the internal optical transceiver 76 feeds back the "arc striking high voltage ready" signal to the external optical transceiver 5; the external optical transceiver 5 then transmits the "striking high voltage ready" signal to the power cabinet 6. At this time, the arc ignition device 7 is in the "arc ignition" standby state.
Next, the power cabinet 6 sends an "arc striking" signal to the external optical transceiver 5, and the external optical transceiver 5 transmits the signal to the internal optical transceiver 76. The built-in optical transceiver 76 then sends a command to the pulse generator 74 to convert the high voltage signal to a high frequency pulsed high voltage signal.
The pulse frequency can be determined according to the requirement, and in this embodiment, 1-10MHz is preferred.
The high-frequency pulse high-voltage signal is directly applied between the cathode 2 and the arc-striking anode 1 of the plasma torch through the high-frequency pulse high-voltage output end 75 to complete arc striking.
Please continue to refer to fig. 2. After the arc striking is successful, the power supply cabinet 6 automatically switches the arc striking anode 1 to the arc striking anode 3 for arc stabilization, and the arc column transfer is completed, namely the arc transfer.
If the built-in optical transceiver 76 cannot receive the arc-striking signal sent by the external optical transceiver 5 connected to the power cabinet, the high-frequency and high-voltage generation and preparation state is automatically turned off, and the standby state is recovered.
Referring to fig. 3, fig. 3 is a schematic diagram of a structure applied to a non-transferred arc according to a preferred embodiment of the present invention. As shown in fig. 3, the principle of the non-transferred arc is basically similar to that of the transferred arc shown in fig. 2, except that the anode 4 of the plasma torch apparatus in the non-transferred arc is used as both the arc ignition anode (corresponding to the arc ignition anode 1 shown in fig. 2) and the anode for stabilizing the arc after the arc ignition (corresponding to the anode 3 shown in fig. 2).
For the whole arc striking process, the non-transferred arc is basically consistent with the transferred arc, that is, the mutual communication and control among the power cabinet 6, the arc striking device 7 and the external optical transceiver 5 are basically consistent, which can be understood by referring to the above description of fig. 2 and will not be described again.
When the invention is applied to equipment for producing conductive powder, the success rate of arc striking can be improved from 50% to over 90%. Meanwhile, the arc striking device has strong adaptability to the ion torch, can obviously reduce the requirement on wiring between the plasma power supply cabinet and the plasma torch, and can be simultaneously suitable for striking the arc of the transferred arc plasma torch and the non-transferred arc plasma torch.
The above description is only for the preferred embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, so that all the equivalent structural changes made by using the contents of the description and the drawings of the present invention should be included in the scope of the present invention.
Claims (9)
1. An arc striking method of a plasma arc, using an arc striking device of the plasma arc provided outside a plasma power supply cabinet, the arc striking device comprising: inside power module, alternating current-direct current conversion module, the module and the pulse generation module that link to each other in proper order to and with alternating current-direct current conversion module, the built-in light transceiver module who steps up module and pulse generation module and connect respectively, built-in light transceiver module still with plasma power cabinet links to each other, its characterized in that includes:
the internal power supply module provides power for the arc striking device and charges the internal power supply module through an external power supply;
after the charging is finished, the connection between the internal power supply module and an external power supply is disconnected, and the complete isolation from a power grid is ensured;
the built-in optical transceiver module is connected with the plasma power cabinet through an external optical transceiver module arranged outside the arc striking device, when arc striking is needed, firstly, an arc striking high-voltage preparation signal is sent to the built-in optical transceiver module through the external optical transceiver module in a wireless communication mode, after the built-in optical transceiver module receives the signal, an instruction is sent to the alternating current-direct current conversion module and the boosting module, a direct current voltage signal generated by the internal power module is converted into an alternating current high-voltage signal, and arc striking high-voltage preparation is completed;
then, the built-in optical transceiver module feeds back an arc striking high-voltage ready signal to the external optical transceiver module, and the external optical transceiver module transmits the arc striking high-voltage ready signal to the plasma power cabinet, and at the moment, the plasma power cabinet is in an arc striking standby state;
and then, according to the requirement, the plasma power supply cabinet sends an arc striking signal to the external optical transceiver module, the external optical transceiver module transmits the signal to the internal optical transceiver module, the internal optical transceiver module immediately sends an instruction to the pulse generation module, the high-voltage signal is converted into a high-frequency pulse high-voltage signal, and the high-frequency pulse high-voltage signal is directly added between the cathode and the arc striking anode of the plasma torch to complete arc striking.
2. The arc striking method according to claim 1, wherein the built-in optical transceiver module is connected with the AC/DC conversion module, the boost module and the pulse generation module by communication signal lines.
3. The arc ignition method according to claim 1, wherein the built-in optical transceiver module is connected to the plasma power cabinet through an external optical transceiver module provided outside the arc ignition device.
4. The arc striking method of claim 3, wherein said external optical transceiver module is disposed inside or outside said plasma power cabinet.
5. The arc striking method according to claim 3, wherein the external optical transceiver module is connected with the plasma power cabinet by a communication signal line, and the external optical transceiver module is connected with the internal optical transceiver module by a wireless communication mode.
6. The arc ignition method according to claim 1, wherein the internal power supply module is a battery.
7. The arc striking method of claim 6, wherein said battery is connected to an external power source for charging via a charging interface.
8. The method of claim 7, wherein the battery is disconnected from an external power source during arc initiation.
9. The method of claim 1, wherein the pulse generation module is connected to an arc ignition electrode of the plasma torch via a high voltage output port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014810.5A CN109982499B (en) | 2019-01-08 | 2019-01-08 | Arc striking device and method for plasma arc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014810.5A CN109982499B (en) | 2019-01-08 | 2019-01-08 | Arc striking device and method for plasma arc |
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| CN109982499A CN109982499A (en) | 2019-07-05 |
| CN109982499B true CN109982499B (en) | 2022-10-21 |
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| EP1530409A2 (en) * | 2003-11-05 | 2005-05-11 | Trafimet S.P.A. | Striking circuit of the pilot arc for plasma arc torches |
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| CN205546156U (en) * | 2016-03-22 | 2016-08-31 | 河北英照照明科技有限公司 | Arc -striking circuit for full -bridge low -frequency square -wave ballast with no secondary winding |
| CN207801548U (en) * | 2018-02-28 | 2018-08-31 | 陕西昕宇电力电子技术有限公司 | A kind of independently-powered anti-interference contactless striking power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN86201021U (en) * | 1986-02-21 | 1986-11-05 | 中国科学院电工研究所 | Generating the arc device with high-pressure monopulse for ion coat |
| CN2191057Y (en) * | 1994-02-07 | 1995-03-08 | 朱丹平 | Miniature arc generator for arc welder |
| EP1530409A2 (en) * | 2003-11-05 | 2005-05-11 | Trafimet S.P.A. | Striking circuit of the pilot arc for plasma arc torches |
| CN201815773U (en) * | 2010-05-20 | 2011-05-04 | 江苏伟业安装集团有限公司 | Argon-arc welding high frequency arc striking device |
| CN101985187A (en) * | 2010-09-19 | 2011-03-16 | 深圳市华意隆实业发展有限公司 | Energy storage inverter type air plasma cutter for rescue emergencies |
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| CN205546156U (en) * | 2016-03-22 | 2016-08-31 | 河北英照照明科技有限公司 | Arc -striking circuit for full -bridge low -frequency square -wave ballast with no secondary winding |
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