CN107995716B - Compact alternating current arc heating device and driving method thereof - Google Patents

Compact alternating current arc heating device and driving method thereof Download PDF

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Publication number
CN107995716B
CN107995716B CN201711308978.4A CN201711308978A CN107995716B CN 107995716 B CN107995716 B CN 107995716B CN 201711308978 A CN201711308978 A CN 201711308978A CN 107995716 B CN107995716 B CN 107995716B
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needle
positive
negative
electrode
electrodes
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CN107995716A (en
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李亮
张立
周菲嫣
郝培林
张厚楷
孙培泽
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Yongchun County Product Quality Inspection Institute Fujian fragrance product quality inspection center, national incense burning product quality supervision and Inspection Center (Fujian)
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Xian Jiaotong University
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/18—Heating by arc discharge
    • H05B7/20—Direct heating by arc discharge, i.e. where at least one end of the arc directly acts on the material to be heated, including additional resistance heating by arc current flowing through the material to be heated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Plasma Technology (AREA)

Abstract

The invention discloses a compact alternating current arc heating device and a driving method thereof, wherein the device comprises at least two pairs of pin electrode pairs arranged on the same plane or two planes and a driving module connected with the pin electrode pairs; the needle electrode pair comprises a positive needle and a negative needle, the positive needle and the negative needle are oppositely arranged and are symmetrically and radially arranged along the center, and the outer end of the needle electrode is connected with the driving module; the driving module comprises a low-power transformer and a high-voltage diode, wherein the primary side of the low-power transformer is provided with two windings with opposite same-name ends, the secondary side of the low-power transformer is provided with a single winding, and the secondary side of the low-power transformer is connected with the high-voltage diode; the output end of the secondary side is connected to the positive electrode needle and the negative electrode needle of the corresponding needle electrode pair; the control signal of the driving module follows the time sequence to sequentially drive each pin electrode pair to generate electric arcs, so that electric arc heating is realized. The invention has compact arrangement of a plurality of pairs of electrodes, and the electric arc can not be crossed when in work, so that the electrodes have long service life and stable work, and are suitable for being applied to electric arc heating occasions.

Description

Compact alternating current arc heating device and driving method thereof
Technical Field
The invention belongs to the field of electric arc heating, and particularly relates to a compact alternating current electric arc heating device and a driving method thereof.
Background
In low power gas heating applications, the arc is usually generated by positive and negative pin electrode discharges to obtain a hot core with extremely high temperature and temperature gradient, which can be rapidly heated when the gas flow passes through the arc.
At present, most of the research at home and abroad is that a single pair of needle electrodes discharge to generate high-temperature electric arc. The device has simple structure and high energy efficiency, however, because the arc temperature is high and the momentum of arc plasma is large, under the thermal action of the arc, the electrode of the device needle is easy to be ablated, and the use effect and the service life of the heating device are influenced. The method of dispersing arc current by using multiple pairs of electrodes can reduce ablation, but when the multiple pairs of electrodes are close, the electrodes are easy to generate arc cross-line, for example, in the case of direct current, an arc is generated between the positive electrode of the first pair of electrodes and the negative electrode of the second pair of electrodes, and an arc is generated between the positive electrode of the second pair of electrodes and the negative electrode of the first pair of electrodes, so that the spatial distribution of the arc is influenced, the heating effect and the electrical characteristics of the device are changed, therefore, the multiple pairs of electrodes are required to be far enough, the volume of the heating device is increased finally, and the arc dispersion also reduces the plasma temperature.
Disclosure of Invention
Aiming at the problems of short service life and small action area of the existing electric arc heating device, the invention provides a compact alternating current electric arc heating device and a driving method thereof, so that a plurality of pairs of electrodes discharge in a compact space to form a heating core, and each pair of electrodes work without influencing each other, thereby avoiding the occurrence of electric arc series.
The invention is realized by the following technical scheme.
A compact alternating current arc heating device comprises at least two pairs of pin electrodes arranged on the same plane or two planes and a driving module connected with the pin electrodes;
the needle electrode pair comprises a positive needle and a negative needle, the positive needle and the negative needle are oppositely arranged and are symmetrically arranged along the center, the needle electrodes are embedded in the quartz pipeline along the radial direction, and the outer ends of the needle electrodes are connected with the driving module;
the driving module comprises a low-power transformer and a high-voltage diode, wherein the primary side of the low-power transformer is provided with two windings with opposite homonymy ends, the secondary side of the low-power transformer is provided with a single winding, and the secondary side of the low-power transformer is connected with the high-voltage diode; the output end of the secondary side is connected to the positive electrode needle and the negative electrode needle of the corresponding needle electrode pair; the control signal of the driving module follows the time sequence to sequentially drive each pin electrode pair to generate electric arcs, so that electric arc heating is realized.
Preferably, the electrode distance between each pair of needle electrodes is 5-15 mm.
Preferably, the number of pairs of needle electrodes is 2-5.
Preferably, the plurality of needle electrode pairs arranged on the same plane are uniformly distributed, the positive needles and the negative needles are adjacently arranged, connecting lines of the positive needles and the negative needles of all the needle electrode pairs pass through the same point, and the connecting lines form a pair of electrode pairs through the positive needles and the negative needles at the symmetric centers.
Preferably, the plurality of needle electrode pairs arranged on the two planes are uniformly distributed, the positive needles are annularly arranged on the same plane along the center, the negative needles are annularly arranged on the other plane along the center, the two planes are parallel to each other, connecting lines of the positive needles and the negative needles of all the needle electrode pairs pass through the same point, and the connecting lines pass through the positive needles and the negative needles at the symmetric centers to form a pair of electrodes.
Preferably, the distance between the planes of the positive electrode needle and the negative electrode needle is 3-7 mm.
Preferably, the two windings with the same name and opposite ends of the primary side of the low-power transformer comprise two groups of coils with the same name and the same primary side and coils with the same name and opposite primary sides, and one end of the secondary side coil is output through the high-voltage diode.
Preferably, an output positive electrode of the output end of the driving module is connected with a positive electrode pin of a pair of pin electrodes, and an output negative electrode is connected with a negative electrode pin of the pin electrode pair.
Preferably, the positive electrode needle and the negative electrode needle of the needle electrode pair are both tungsten needles with the tip diameters of 20 micrometers; the outer end of the electrode needle is connected with a high-voltage lead.
The invention further provides a driving method of the compact alternating current arc heating device, which comprises the following steps:
1) for the driving module of the needle electrode pair generating the electric arc at the moment, a transient voltage is applied to the same coil of the primary side of the low-power transformer and the same coil of the secondary side of the low-power transformer, and no transient voltage is applied to the coil of the same side of the low-power transformer opposite to the secondary side of the low-power transformer;
2) for the drive module of other needle electrode pairs which do not output at the moment, applying transient voltage to the coil with the same name end opposite to the secondary side, and not applying the transient voltage to the coil with the same name end as the secondary side;
3) after the output arc of one needle electrode pair is finished, all the driving modules stop any output in a very short time, then the working electrodes are replaced, the arc is output by the other needle electrode pair, and arcs are generated periodically for each pair of electrodes.
Compared with the existing single-pair electrode electric arc heating device, the device has the advantages that the arrangement of a plurality of pairs of electrodes is compact, and the heating core temperature is increased. The driving circuit utilizes the diode and the opposite coil on the primary side to be matched, so that for the electrode pair which does not work, the current is blocked by the diode when being input along the direction of the diode, and the current is blocked by the induced potential difference when being input along the direction of the diode, namely, the diode which does not work presents a high resistance state, thereby avoiding the occurrence of wire stringing when the electric arc works, ensuring that the service life of the electrode is long, the work is stable, and the application prospect in the electric arc heating occasion is huge.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a single plane electrode configuration of a plurality of pairs of pin ring electrodes according to the present invention;
FIG. 2 is a schematic diagram of a two-plane electrode configuration of a plurality of pairs of needle ring electrodes according to the present invention;
FIG. 3 shows a driving circuit for a plurality of pairs of needle ring electrodes according to the present invention (taking three pairs of electrodes as an example);
FIG. 4 is the driving logic for multiple pairs of pin ring electrodes of the present invention.
In fig. 1 to 4: 1. a needle electrode; 2. a pair of needle electrodes; 3. a reference plane I; 4. a reference plane II; 5. the same end and the same coil of the secondary side are the same; 6. the coil with the same name end opposite to the secondary side; 7. a magnetic core; 8. a drive module; 9. a secondary coil; 10. a high voltage diode; 11. outputting a positive electrode; 12. and outputting the negative electrode.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited thereto.
In an embodiment 1, the configuration of the multiple pairs of pin electrodes is shown in fig. 1, the driving module 8 is shown in fig. 3, and the logic signals are shown in fig. 4.
Example 1 was used to heat gas flowing through a pipe.
Three pairs of needle electrode pairs 2 are annularly arranged on the same plane in a heating area, the three pairs of needle electrodes are symmetrically arranged in the center, the needle electrode pairs 2 are uniformly distributed, positive needles and negative needles are adjacently arranged, connecting lines of the positive needles and the negative needles of all the needle electrode pairs 2 pass through the same point, the connecting lines form a pair of electrode pairs through the positive needles and the negative needles in the center of symmetry, and the electrode distance between each pair of needle electrode pairs 2 is 5-15 mm. And is embedded in a quartz tube with the inner diameter of 8mm, the wall thickness of 5mm and the length of 50mm along the radial direction. The length of the needle electrode 1 extending out of the pipeline is 1mm, and the outer end of the needle electrode is connected with a high-voltage lead. The adopted needle electrodes are all tungsten needles with the tip diameter of about 20 mu m. The outer end of the needle electrode and a high-voltage lead connected with the needle electrode.
The drive module 8 of embodiment 1 is shown in fig. 3. The driver module 8 consists of 3 low power transformers and 3 high voltage diodes. The parameters of each transformer are the same, the primary side is a winding with two same-name ends opposite, the secondary side is a single winding, and the two windings of the primary side are provided with a common end. As shown in figure A1、B1、C1And the minor side A+、B+、C+Ends with the same name each other, A2、B2、C2And the minor side A+、B+、C+Are mutually non-homonymous terminals. The two windings of the primary side having a common terminal A0、B0、C0And the other end of the transformer inputs a logic signal to control the working state of the transformer. The anode of the secondary side is connected with the anode of the single-pair needle electrode through a diode, and the cathode is connected with the cathode of the single-pair needle electrode. The electrodes are sequentially conducted by inputting a logic driving signal at the primary side. The control signal of the driving module 8 follows the time sequence to sequentially drive each needle electrode pair 2 to generate electric arcs, so that electric arc heating is realized.
The primary side of a low-voltage power transformer of the driving module 8 comprises a coil 5 with the same name end and the same secondary side and a coil 6 with the same name end and the opposite secondary side, the secondary side of the low-voltage power transformer comprises a secondary coil 9, and the transformer adopts a magnetic core 7. And the output is output from one end of the secondary coil 9 through a high-voltage diode 10. The output anode 11 of the output end of the driving module 8 is connected with the anode pin of the pair of pin electrodes 2, and the output cathode 12 is connected with the cathode pin of the pin electrode pair 2.
The logic signals of example 1 are shown in fig. 4. First pulse, A1Input high level, A2Input zero level, then secondary side A+、A-Output positive polarity high voltage channel diodeInsertion needle electrode, needle electrode A+、A-And (4) arc discharge. At the same time, B1And C1All input zero level, B2、C2Input high level due to diode polarity limitation B+And B-C, C+And C-Between the two electrodes, the connected needle electrodes can not form arc discharge, the second pulse and the subsequent pulse replace the needle electrode B+、B-Or C+、C—The discharge and drive logic driving mode is the same as the above. Dead time exists between every two pulses to reset the magnetic core, so that reliable extinguishing and generation of electric arcs are guaranteed.
In another specific embodiment 2, the configuration of the multiple pairs of needle electrodes is as shown in fig. 2, wherein 4 positive needles and 4 negative needles are uniformly distributed, the positive needles are annularly arranged on the same plane along the center, the negative needles are annularly arranged on another plane along the center, and the two parallel planes are fixed by quartz glass, as shown in reference plane i 3 and reference plane ii 4 of fig. 2; the connecting lines of the positive needles and the negative needles of all the needle electrode pairs 2 pass through the same point, and the connecting lines pass through the positive needles and the negative needles at the symmetrical centers to form a pair of electrodes. The centers of the two pieces of quartz glass are provided with round holes with the diameter of 30mm, and the arrangement of the needle electrodes on each plane is symmetrical along the center of the circle of the round hole. Fixing the distance between the two quartz plates to make the distance between the plane of the positive electrode needle and the plane of the negative electrode needle be 5mm, and arranging the needle electrodes A on the two planes+And A-、B+And B-、C+And C-，D+And D-A pair of needle electrodes is formed to be connected with the corresponding driving module.
The driving method comprises the following steps:
1) for the driving module 8 of the needle electrode pair 2 generating the electric arc at the moment, the coil 5 with the same name end and the same secondary side of the primary side of the low-power transformer applies transient voltage, and the coil 6 with the same name end and the opposite secondary side does not apply the transient voltage;
2) for the driving module 8 of the other needle electrode pair 2 which does not output at the moment, the coil 6 with the same name end opposite to the secondary side applies transient voltage, and the coil 5 with the same name end as the secondary side does not apply transient voltage;
3) after the output arc of one needle electrode pair 2 is finished, all the driving modules 8 stop any output in a very short time, then the working electrodes are replaced, the arc is output by the other needle electrode pair 2, and arcs are generated on each electrode pair periodically.
The control signal drives each pair of electrodes in turn following a specific timing sequence to form an arc discharge. Each pulse is turned on to discharge one pair of electrodes, and the remaining electrodes are turned off. The discharge electrode is replaced at the next pulse. Dead time is reserved between every two pulses to enable the magnetic core to reset, so that the secondary side of the transformer can sense voltage under the next pulse, and the electric arcs are prevented from being connected in series.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (10)

1. A compact AC arc heating device is characterized by comprising at least two pairs of pin electrodes (2) arranged on the same plane or two planes and a driving module (8) connected with the pin electrodes (2);
the needle electrode pair (2) comprises a positive needle and a negative needle, the positive needle and the negative needle are oppositely arranged and are symmetrically and radially arranged along the center, and the outer ends of the needle electrodes are connected with the driving module (8);
the driving module (8) comprises a low-power transformer and a high-voltage diode (10), wherein the primary side of the low-power transformer is provided with two windings with opposite homonymy ends, the secondary side of the low-power transformer is provided with a single winding, and the high-voltage diode (10) is connected to the secondary side; the output end of the secondary side is connected to the positive electrode needle and the negative electrode needle of the corresponding needle electrode pair (2); the control signal of the driving module (8) sequentially drives each needle electrode pair (2) to generate electric arcs according to the time sequence, so that electric arc heating is realized.
2. The compact ac arc heating device according to claim 1, wherein the electrode pitch of each pair of needle electrode pairs (2) is 5-15 mm.
3. The compact ac arc heating device according to claim 1, wherein the number of said pairs of pin electrodes (2) is 2-5.
4. The compact ac arc heating apparatus according to claim 1, wherein the plurality of pin electrode pairs (2) disposed on the same plane are uniformly distributed, the positive pins and the negative pins are arranged adjacently, the connection lines of the positive pins and the negative pins of all the pin electrode pairs (2) pass through the same point, and the connection lines pass through the positive pins and the negative pins at the symmetric center to form a pair of electrodes.
5. The compact ac arc heating device according to claim 1, wherein the plurality of needle electrode pairs (2) disposed on two planes are uniformly distributed, the positive needles are annularly arranged on the same plane along the center, the negative needles are annularly arranged on the other plane along the center, the two planes (4) are parallel to each other, the connection lines of the positive needles and the negative needles of all the needle electrode pairs (2) pass through the same point, and the connection lines form a pair of electrode pairs through the positive and negative needles at the symmetrical centers.
6. The compact ac arc heating device of claim 5, wherein the distance between the planes of the positive and negative pins is 3-7 mm.
7. The compact ac arc heating device according to claim 1, wherein the windings with opposite ends of the same name of the primary side of the low power transformer comprise two sets of windings with the same name of the same coil (5) and the same name of the primary side of the same coil (6), and one end of the secondary winding (9) is output through the high voltage diode (10).
8. The compact alternating current arc heating apparatus according to claim 7, wherein the output positive pole (11) of the output of the driving module (8) is connected to the positive pole pin of a pair of pin electrodes (2), and the output negative pole (12) is connected to the negative pole pin of the pin electrode pair (2).
9. The compact ac arc heating apparatus of claim 1, wherein the outer end of the electrode pin is connected to a high voltage wire.
10. A method of driving a compact ac arc heating apparatus as claimed in any one of claims 1 to 9, comprising the steps of:
1) for the driving module (8) of the needle electrode pair (2) generating the electric arc at the moment, a primary-side same-name end and a secondary-side same coil (5) of the low-power transformer are applied with transient voltage, and a coil (6) with the same-name end and the secondary-side opposite is not applied with the transient voltage;
2) for the driving module (8) of other needle electrode pairs (2) which do not output at the moment, applying transient voltage to the coil (6) with the same name end opposite to the secondary side, and not applying the transient voltage to the coil (5) with the same name end as the secondary side;
3) after the output arc of one needle electrode pair (2) is finished, all the driving modules (8) stop any output in a very short time, then the working electrodes are replaced, the arc is output by the other needle electrode pair (2), and arcs are generated on each electrode pair periodically.
CN201711308978.4A 2017-12-11 2017-12-11 Compact alternating current arc heating device and driving method thereof Active CN107995716B (en)

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CN109884746B (en) * 2019-04-15 2020-04-07 南京邮电大学 Method for realizing three-electrode discharge circuit for optical fiber welding and optical fiber combiner
CN113727483B (en) * 2021-09-02 2022-12-20 合肥爱普利等离子体有限责任公司 Multi-electrode alternating current arc discharge device, equipment and alternating current power supply

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CN106558998A (en) * 2016-12-07 2017-04-05 广州金升阳科技有限公司 Asymmetrical half-bridge circuit of reversed excitation

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