CN202535627U

CN202535627U - Arc ignition system of plasma torch

Info

Publication number: CN202535627U
Application number: CN2012200962258U
Authority: CN
Inventors: 徐勇; 李自兵
Original assignee: Xinjiang Tianye Group Co Ltd
Current assignee: Xinjiang Tianye Group Co Ltd
Priority date: 2012-03-10
Filing date: 2012-03-10
Publication date: 2012-11-14
Anticipated expiration: 2022-03-10

Abstract

The utility model aims to provide an arc ignition method of a plasma torch, and the method is suitable for arc ignition of a high-power and long plasma torch. The method is to connect at least two arc ignition circuits and a plasma power supply in parallel and then connect them to a plasma torch, start the arc ignition circuits after the plasma power supply supplies power to the plasma torch, and break down adjacent electrodes of the plasma torch sequentially from the first level, wherein the generated electric arcs are blown to the center area of the torch by airflow and are connected to form a longer arc. A principle employed in the method is to use charging and discharging characteristics of a pulse capacitor and to ignite an arc of a torch successfully by adopting the method of stepwise arc ignition.

Description

The plasmatorch arc ignition system

Technical field

The utility model relates to a kind of arc ignition system, especially a kind of plasma torch arc ignition system.

Background technology

Development along with plasma technology; Isoionic application is also all the more extensive; In plasma chemical industry field, the power of plasmatorch also is increased to the MW level, and length also constantly increases; The phenomenon of striking difficulty when the design of long plasmatorch causes plasmatorch start to take place, studying the plasma arc ignition system that a kind of and high-power, long plasmatorch matches thus is the technical barrier of plasma industry solution.Chinese patent 200820238347.X and Chinese patent 201020509565.X have all introduced arc-initiating device, and they are a kind of high-frequency arc strike systems, the plasmatorch that suitable power is low.

Summary of the invention

The purpose of the utility model is to provide a kind of arc ignition system of plasma torch, is applicable to powerful, long plasmatorch striking.

The solution that realizes above-mentioned purpose is:

A kind of plasmatorch arc ignition system comprises plasma power supply, plasma torch, striking loop, control loop; Control loop control striking loop; Article at least two, striking loop and plasma power supply are connected with plasmatorch respectively and form the plasmatorch arc ignition system; After plasma power supply is to the plasmatorch power supply, start the striking loop; Puncture the adjacent electrode of plasmatorch successively from the first order, the central area that the electric arc of generation is blown into torch by air-flow couples together and forms longer electric arc.

Described a kind of plasmatorch arc ignition system is in series with capacitor, associate coil, current-limiting resistance, diode, switching device between the positive pole in striking loop, the negative pole; Switching device quantity is at least 1, and these devices can any order series connection.

Described a kind of plasmatorch arc ignition system, the quantity in striking loop is at least 2, and the power or the number of electrodes of pressing plasmatorch increase or reduce.

Described a kind of plasmatorch arc ignition system, but striking loop, striking loop or hf arc starter are arbitrary.

The described plasmatorch arc ignition system of the utility model, the start-up time in striking loop can be plasma power supply to before the plasmatorch power supply, simultaneously, any time in afterwards; Diode in the striking loop, electric capacity also can be to be connected by a plurality of device series, parallel, the arbitrary mode of connection in series-parallel, and promptly diode group, capacitance group can be made high-tension apparatus with low-voltage device like this

The described plasmatorch arc ignition system of the utility model is specially adapted to the striking of V-type plasmatorch.

The basic principle of the utility model is: utilize the charging and discharging characteristic of pulsed capacitance, the mode that adopts striking step by step is successfully with the torch striking.When plasma power supply to plasmatorch power supply back startup striking loop, puncture the adjacent electrode of plasmatorch successively from the first order, the central area that the electric arc of generation is blown into torch by air-flow couples together and forms longer electric arc.

Beneficial effect:

1. the utility model adopts the method for striking step by step, and loop quantity can be selected for use according to actual conditions, and is therefore applied widely, the utilization simple and flexible.

2. the utility model adopts current-limiting resistance, makes whole starting the arc loop and plasma torch electrode current be unlikely to excessive, has prolonged service life of equipment.

3. the utility model starting the arc loop and control loop separate, and have increased fail safe and reliability.

Description of drawings

Fig. 1 is the system diagram of the utility model;

Fig. 2 is the composition diagram in striking loop;

Fig. 3 is arc process figure;

Drawing reference numeral: 1 is plasma power supply, and 2 is plasmatorch, and 3 are the striking loop, and 4 are the striking control loop, and 5 is switching device; 6 is diode, and 7 is current-limiting resistance, and 8 is associate coil, and 9 is capacitor, and 10 are protection gas; 11 is the central area, and 12 is electrode, and 13 are the striking stake, and 14 is electrode gap.

Embodiment

Below in conjunction with accompanying drawing the utility model is specified;

Embodiment 1

Like Fig. 1, shown in 2 and 3; Plasma power supply 1 supply power voltage DC6KV; Series capacitor 9, associate coil 8, current-limiting resistance 7, diode 6, switching device 5 successively between the positive pole in striking loop 3, the negative pole; Switching device 5 is by 4 controls of striking control loop; Striking stake 13 usefulness are set on the electrode 12 of plasmatorch 2 connect striking loop 3; The positive pole in striking loop 3 connects near nearly plasmatorch 2 anodal

striking stakes

13, and 13, two striking loops of striking stake 3 that negative pole connects nearly plasmatorch 2 negative poles are connected in plasmatorch 2 with plasma power supply 1; After plasma power supply 1 supplies power for plasmatorch 2, plasmatorch 2 anodal and first segment electrode voltage 6KV, control loop 4 starts two striking loops 3, punctures the gap 14a between plasmatorch 2 positive poles and the electrode 12a, and first order striking is accomplished; Plasma power supply gives capacitor 9 chargings through striking stake 13, is full of the back capacitor discharge and gives first segment electrode 12a voltage 6KV, punctures the first segment and the second economize on electricity clearance between poles 14b, and second level striking is accomplished; This process down punctures the adjacent electrode gap successively; The electric arc that produces is coupled together by the central area 11 of protecting gas 10 to be blown into plasmatorch 2 and forms longer electric arc; The resistance moment decline of plasmatorch 2; Plasma power supply 1 voltage is also got back to the pilot arc work of the normal voltage 1000V left and right sides fast, and control loop 4 cut-off switch devices 5 are promptly closed 3, the starting the arc in starting the arc loop and accomplished.

Embodiment 2

Embodiment 2 is with the difference of embodiment 1; Adopted 15 tunnel striking loop to give V-type plasmatorch striking, the positive pole of torch and negative pole puncture to the target of plasmatorch 2 simultaneously successively.

Embodiment 3 is with the difference of

embodiment

1,2; Between the positive pole in striking loop 3, the negative pole, only series capacitor 9 and switching device 5.

Claims

1. plasmatorch arc ignition system; Comprise plasma power supply, plasma torch, striking loop, control loop; It is characterized in that control loop control striking loop, at least two striking loops are connected with plasmatorch respectively with plasma power supply and form the plasmatorch arc ignition system.

2. a kind of plasmatorch arc ignition system according to claim 1 is characterized in that being in series with capacitor, associate coil, current-limiting resistance, diode, switching device between the positive pole, negative pole in striking loop.

3. according to claim 1 or 2 each described a kind of plasmatorch arc ignition system, it is characterized in that the quantity in striking loop is at least 2, the power or the number of electrodes of pressing plasmatorch increase or reduce.

4. a kind of plasmatorch arc ignition system according to claim 3, but it is characterized in that striking loop, striking loop or hf arc starter are arbitrary.