• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A plasma burner has contact protection means for protecting the operator against impermissibly high voltage and the burner head itself against destruction. The burner comprises a nozzle 1 attached to a nozzle holder 2 and surrounded by a nozzle cap 3, with cooling water flowing between the nozzle 1 and cap 3. Disposed over the nozzle cap 3 and insulated therefrom by an air gap 9 is an electrically conductive protective cap 8 which is mounted on the burner shaft by means of two contact pieces 7 constructed as half rings. Each of the two contact pieces 7 is connected via a cable to a fault current protective circuit. The operating conditions are monitored by means of voltage indicators which effect switching functions, and resistors, capacitors and diodes connected in correspondence thereto, and if malfunctions occur, switching operations are triggered which protect the plasma burner and the installation. <IMAGE>
    公开号:SU1046982A1
    申请号:SU807771049
    申请日:1980-02-05
    公开日:1983-10-07
    发明作者:Йохан Беме；Диетер Одрих；Рудольф Похерт；Петер Визе；Петер Йагениак；Ханс Коердт
    申请人:Феб Мансфельд-Комбинат；
    IPC主号:
    专利说明:

    2. Burner pop.1, characterized in that holes are made in the security cap ..
    3., The burner according to claims 1 and 2, that is, so that the nozzle section protrudes from under the guard cap. .
    4 .. Burner according to .pp. 1-3, -o t it is due to the fact that
    the cap is attached to the contact elements using a threaded or w. elastic connection.
    5. Burner according to claims 1-4, characterized in that the voltage indicator is designed as a relay on a semiconductor basis or an electromechanical type.
    . .1, .... The invention relates to mechanical engineering, in particular, to plasma cutting and welding, and can be used in the development of plasma torches with operator shielding from stress and protection of elements of the burner design. From destruction during various emergency situations. . Plasma torches are known, in particular hand-held, equipped with various operating devices for the protection of the operator, for example a nozzle, covered with a ceramic cap or a ceramic or enamel coating. The spatter and metal vapors arising during the cutting process cover the protective caps with a relatively metallic layer, resulting in electrical contact with the nozzle. In this way, areas under voltage that present a hazard during operation can be formed. Closest to the present invention, there is a plasma torch containing a nozzle with a cap., Forming a nozzle cooling jacket, a cathode mounted coaxially in the nozzle, a leakage current protection system including a voltage indicator between the nozzle and the workpiece. In a known burner, the nozzle cap is separated from the nozzle by a ceramic insulator and an elastic seal. the shield cap is under the potential of the workpiece to be processed or under the ground potential, which provides a protection circuit against emergency supply of potential. If the voltage is suddenly exceeded, the protection circuit shuts off the source that supplies the plasma arc. The disadvantage of this burner is that at the time when the nozzle cap in case of inconvenient cutting positions, for example, accidentally comes into contact with the workpiece, the protection system is blocked. If in such a tea there is an arc closure or the formation of a metal bridge on the ceramic insulator, then in most cases the insulator is destroyed as a result of a thermal overload. In addition, the nozzle cap undergoes electrolytic decomposition, due to the high voltage between the nozzle and the nozzle cap. At the same time cooling, and water acts as an electrolyte. All this reduces reliably. There is a plasma torch. The purpose of the invention is to improve the reliability of the burner and the safety of its operation. . . The goal is achieved by the fact that in a plasma torch containing a nozzle with a cap, forming a nozzle cooling jacket, a cathode installed in the nozzle coaxially with it, a leakage current protection system, including a voltage indicator between the nozzle and the workpiece, has a protective cap , covering the nozzle cap, made of electrically conductive material, installed with a gap in relation to the nozzle cap and connected to at least two contact elements with a leakage current protection system with single-wire with In series, and in series with the voltage indicator, a resistor is connected, in parallel with which a series-connected capacitor and a diode are connected. In addition, holes are made in the security cap. In this case, the nozzle section protrudes from under the protective cap. Moreover, the protective cap can be attached to the contact elements using a threaded or up. other compound. In addition, the voltage indicator can be made as a semiconductor-based or electromechanical type relay. Figure 1 shows a plasma torch, a cut; 2 is an electrical protection circuit. The plasma torch contains nozzles 1, mounted on the nozzle holder 2 with the help of cap 3. Shirt 4 cooling nozzle 1 for propelling the cooling water forms;: o1; scrap 1 and cap 3. The seal 1: la 1 on the holder 2 is carried out Razinoy round section. Through the insulator 6 on the holder 2, the nozzles are installed, a protective cap 8. The insulator b has two contact elements 7 in the form of half rings, to which one wire is connected. The contact element 7 can be cut into a retainer for fastening the protective cap. Both contact elements 7 are at the same potential. Since the protective cap 8 is made of electrically conductive material, an air gap 9 is maintained between the protective cap and the cap 3 of the nozzle 1. A cathode 10 is mounted on the burner axis. According to the electric circuit of the supply and protection of the burner (Fig. 2), the workpiece .11 is connected to the power supply system by the drive 12. The protective cap 8 through two wires connected to each. -from the contact elements 7, connected via a start-stop switch 13 to the outside transformer 14, rectifier 15 and relay 16, Relay 16 controls the start-stop circuit and is a voltage indicator. In addition, the security cap 8 is connected through a diode 17 with a leakage current protection system in the form of a relay 18. In addition, a nozzle 1 is connected to part 11 via a relay 19 and a resistor 20. Parallel to the resistor, a chain of series-connected capacitors 21 and a diode 24 is connected. Diode 24 can be blocked by contact 25 connecting a chain of series-connected capacitor 22 and resistor 23. The circuit also includes relays 26 and diode 28 between which there are contacts 19 and 19 of rest, as well as normally closed contact D-ia MeHHaH burner with protection system works as follows. In the normal arc burning mode between the cathode 10 to the nozzle 1, the nozzle 1 is at some potential relative to the workpiece 11. Under the action of this voltage of the relay 19, the capacitors 21 and 22 are triggered and the capacitors 21 and 22 are charged at the same time. is caused by the discharge of the capacitor 22. Thus, the relay 1 cannot act on the burner stop circuit. If, however, when working: -o ;: to her burner nozzle 1 i; the security cap 8 is short-circuited due to metal spraying, the monitoring of the leakage current on the cap O cannot be turned on, since the cap is electrically directly connected to part 11, the relay 19 is open and the burner is turned off. This state is maintained by the operation of relay 26. -Contacts .19 and 19 are open when relay 19 is activated. Contacts 27 and 27 are closed during the cutting process. At the normal start of the cutting process, pins 26 and 26 open - before contacts 27 and. 27. If, after an emergency shutdown, the operator turns on the plasma torch again, and the disturbance is still in effect, then contact 25 of the capacitor of the capacitor 21 will be charged through contact 25 through the closing jumper between nozzle 1 and the protective cap 8. Relay 19 will be activated for a short time and when it is opened through contacts 26, 26, 27 and 19 and diode 28, a leakage current relay 18 is activated, which ensures emergency shutdown of the burner. Thus, if the leakage current protection circuit operates during the cutting mode, the plasma torch is turned off. In the case of a reliable voltage in the nozzle 1, only the cutting operation is interrupted. The operator presses the switch 13 again starts the burners ,. If, after this, the voltage of the nozzle remains zero, then a pre-comparison is made. direct voltage. - on the capacitor 21, the Operator can thus determine the cause of the shutdown, the closure between the nozzle and the protective cap, the contact of the heating body with the workpiece, etc., which should be eliminated. For plasma torches with a capacity of more than 20 kW, it is advisable to make holes in the security cap if the gaps to reduce heat dissipation are narrow. It is advisable to make the nozzle protruding beyond the cut of the security cap; this facilitates visual control of the process. With additional installation diode 3 relay circuit. 19, according to the type of diodes 17 and 28 installed, additional functions, such as a thermal overload protection function, should be assigned to the protection system. The invention makes it possible to eliminate defects of the nozzle cap of the protection circuit in various emergency situations I. To secure the contact of the operator with
    torch elements but all failure situations. This increases the reliance and operational safety of the plasma torch.
    It is recognized as an invention according to the results of the examination carried out by the Office for the Invention of the German Democratic Republic.
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    权利要求:
    Claims (5)
    [1]
    1. A PLASMA BURNER containing a nozzle with a cap a cap 8, covering the cap 3 of the nozzle, made of an electrically conductive material, installed with a gap 9 in relation to the cap 3 of the nozzle and connected with at least two contact elements 7 to the system of protection against leakage current by single-wire connections, and a resistor 20 is connected in series with the voltage indicator, in parallel with which a capacitor 21 and a diode 24 are connected in series. ®
    1046982 A
    Ag "7
    [2]
    2. The burner according to claim 1, characterized in that the holes in the guard cover are made.
    [3]
    3., The burner in accordance with claims 1 and .2, with no exception, the nozzle section protrudes from under the guard cap.
    [4]
    4 .. The burner in accordance with
    [5]
    5. The burner according to claims 1 to 4, characterized. the fact that the voltage indicator is made in the form of a relay on a semiconductor base or electromechanical type.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR2450659A1|1980-10-03|
    SE8001733L|1980-09-07|
    JPS6258894U|1987-04-11|
    JPS55146894A|1980-11-15|
    DD142267B1|1980-12-24|
    GB2048457B|1983-02-02|
    GB2048457A|1980-12-10|
    BG39109A1|1986-04-15|
    FR2450659B1|1984-04-06|
    DD142267A1|1980-06-11|
    SE444629B|1986-04-21|
    AT374717B|1984-05-25|
    ATA83380A|1983-10-15|
    DE3005894C2|1989-10-12|
    DE3005894A1|1980-09-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DD63823A|
    DE1615352B2|1967-11-02|1971-09-02|VEB Mansfeld Kombinat Wilhelm Pieck, χ 4250 Lutherstadt Eisleben|CIRCUIT ARRANGEMENT AND DEVICE FOR PLASMA HAND TURNERS|
    DD87361A1|1970-10-23|1972-01-20|Electric discharge system for oxidizing gases|
    DD132706A3|1974-10-08|1978-10-25|Jochen Boehme|METHOD AND DEVICE FOR PROTECTING THE DUTIES OF WORK-PLASTERED PLASMA ROLLERS|FR2534107B1|1982-10-01|1985-04-19|Soudure Autogene Francaise|
    DE3328777C2|1983-08-10|1990-01-25|Fried. Krupp Gmbh, 4300 Essen, De|
    IT1204121B|1986-02-27|1989-03-01|Cebora Spa|WELDING TORCH OR PLASMA CUTTING WITH NON-TRANSFERRED ARC|
    US4855563A|1986-08-11|1989-08-08|Beresnev Alexei S|Device for plasma-arc cutting of biological tissues|
    DE3810620C1|1988-03-29|1989-09-21|Messer Griesheim Gmbh, 6000 Frankfurt, De|Plasma burner|
    CA1310706C|1988-04-26|1992-11-24|Toshihiko Okada|Water cooled plasma arc apparatus|
    US5216221A|1992-01-17|1993-06-01|Esab Welding Products, Inc.|Plasma arc torch power disabling mechanism|
    DE10124013A1|2001-05-17|2002-11-21|Isphording Germany Gmbh|Burner head of a gas burner|
    FR2983674B1|2011-12-01|2014-09-26|Air Liquide|ARC PLASMA TORCH WITH ENHANCED ELECTRICAL INSULATION|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD21141479A|DD142267B1|1979-03-06|1979-03-06|Plasma torch with contact protection|
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