EP0687859A2 - Cutting torch - Google Patents

Cutting torch Download PDF

Info

Publication number
EP0687859A2
EP0687859A2 EP95108886A EP95108886A EP0687859A2 EP 0687859 A2 EP0687859 A2 EP 0687859A2 EP 95108886 A EP95108886 A EP 95108886A EP 95108886 A EP95108886 A EP 95108886A EP 0687859 A2 EP0687859 A2 EP 0687859A2
Authority
EP
European Patent Office
Prior art keywords
cutting
ignition
gas
oxygen
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95108886A
Other languages
German (de)
French (fr)
Other versions
EP0687859A3 (en
EP0687859B1 (en
Inventor
Manfred Agel
Karl Gollwitz
Klaus Sonnenborn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim Schweisstechnik GmbH and Co
Original Assignee
Messer Griesheim Schweisstechnik GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer Griesheim Schweisstechnik GmbH and Co filed Critical Messer Griesheim Schweisstechnik GmbH and Co
Publication of EP0687859A2 publication Critical patent/EP0687859A2/en
Publication of EP0687859A3 publication Critical patent/EP0687859A3/en
Application granted granted Critical
Publication of EP0687859B1 publication Critical patent/EP0687859B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • F23D14/42—Torches, e.g. for brazing or heating for cutting

Definitions

  • the invention relates to a cutting torch according to the preamble of claim 1.
  • the fuel gas / heating oxygen mixture and the cutting oxygen jet are set on valves of the cutting torch.
  • fuel gas e.g. acetylene
  • oxygen are mixed in a ratio of 1: 1.
  • the fuel gas is drawn in by the flowing heating oxygen and mixes in the mixing nozzle and the fuel gas / heating oxygen supply line. After ignition, this gas mixture burns as a flame at the flame cutting nozzle.
  • Ignition devices arranged inside the cutting torch have proven to be advantageous for igniting the fuel gas / heating oxygen mixture, since they pollute less and there are also no collision risks with workpieces or workpiece devices with these internal ignition burners compared to so-called external ignition burners.
  • ignition gases are taken separately from the supply lines for the fuel gas and the heating oxygen and mixed in a separate mixer (DE-OS 39 41 370, DE-OS 41 43 144, DE-OS 39 41 371) or the ignition gas separately Supply sources removed and led to an ignition gas quantity control device (DE-OS 3 52 79 55).
  • a cutting torch has become known from US Pat. No. 3,255,803, in which the ignition gas flows from the heating channel into the cutting oxygen via a transverse bore and here via a Ignition device is ignited.
  • the disadvantages associated with such a transverse bore namely flashover of the pilot flame in the heating channel and unilateral influence on the heating flame when cutting oxygen is flowing, are to be prevented according to DE-OS 35 16 511 by a threaded screw arranged in the transverse bore.
  • the advantage of these ignition devices is that the ignition gas is already removed from the cutting torch as a premixed fuel gas / heating oxygen mixture and no complex control devices for the ignition gas are required.
  • the invention is therefore based on the object of guiding the ignition gas removed from the fuel gas / heating oxygen mixture into the cutting oxygen feed line in such a way that the cutting oxygen or the pilot flame can be reliably prevented from influencing the fuel gas / heating oxygen mixture.
  • an ignition gas line is on the distribution channel for the heating channels of the cutting nozzle connected via which the premixed fuel gas / heating oxygen mixture is removed as ignition gas and fed to the cutting oxygen feed line.
  • the pilot gas mixture can advantageously be regulated separately by an adjusting valve on each cutting torch and on each cutting nozzle, so that tolerances such. B. in the pilot gas line or the adjustment fittings for fuel gas and heating oxygen, or the setting of the heating gases can be compensated.
  • the ignition gas volume can be adapted to the respective cutting nozzle.
  • the cutting torch By removing the pilot gas from the distributor channel, the cutting torch can be operated at fuel gas pressures of 0.2 bar or more, because the back pressure built up in the distributor channel has an almost constant value independent of the inlet pressures of the heating gases, which is sufficient for the pilot gas to be at the required pressure which is connected to a flame arrester downstream of the control valve and is therefore adjustable.
  • the cutting torch according to the invention is highly safe, since flashbacks of the pilot flame do not lead to flashbacks in the distributor channel and fuel gas / fuel mixture feed line due to the flame arresters arranged in the pilot gas line.
  • the ignition device of the cutting torch is easy to use and requires little maintenance and does not require any complex control.
  • the cutting torch can be operated with all fuel gases without structural changes, because the cutting torch is designed according to the type of fuel gas and the pilot gas mixture can be removed from the heating flame previously adjusted in the correct ratio and adjusted in quantity via an adjusting valve of the flame cutting nozzle.
  • a cutting torch 10 is shown in partial section, which essentially consists of a valve body 11, a burner head 12, an injector with a gas mixture-carrying line and a Burner head 12 with the valve body 11 connecting guide tube 13.
  • a nozzle not shown, is attached to the burner head 12.
  • the nozzle is preferably in two parts and is designed as a slot nozzle.
  • the heating nozzle is screwed into the internal thread 14 (FIG. 2) by means of an external thread formed at its upper end and the cutting nozzle into the internal thread 15 of the burner head 12.
  • heating nozzle and the cutting nozzle in one piece, or to fasten it to the torch head 12 by means of a pressure screw (not shown).
  • the cutting channel arranged in the middle of the cutting nozzle is connected to the cutting oxygen supply line 16 of the torch head 12.
  • the cutting oxygen supply line 16 extends over the cutting oxygen tube 17 into the valve body 11.
  • the cutting nozzle is connected to the cutting oxygen supply source 19 by means of a connection 18 via a connecting bore (not shown in detail) in the valve body 11.
  • a backflow preventer with a flame barrier 20 and an adjusting valve 21, with which the cutting oxygen is adjusted are arranged in the flow direction upstream of the connecting piece 18.
  • the cutting channel of the cutting nozzle, not shown, the cutting oxygen channel 16 and the cutting oxygen tube 17 as well as the connecting bore, not shown, to the threaded connector 18 are preferably formed in a straight line within the cutting torch 10 and thus enable advantageously the arrangement of a sensor for flame monitoring in the cutting oxygen pipe / duct.
  • the heating nozzle is connected via the fuel gas / heating oxygen mixture feed line 23 (FIG. 2) to the injector arranged in the valve body 11.
  • the injector is connected via connecting pieces 22, 26 for the fuel gas and the heating oxygen, adjusting valves 43, 44 and non-return valves 27 with flame arresters, 8 flame arresters with the fuel gas and heating oxygen supply sources 24, 9.
  • the fuel gas / fuel mixture tube 23 arranged within the guide tube 13 of the cutting torch 10 and connected via the injector to the connecting pieces 22, 26 is not shown in FIG. 1.
  • An electrical ignition device which is designated 28 in its entirety, is arranged within the cutting torch 10.
  • the electrical ignition device 28 consists of a separate ignition gas line 29 and an ignition electrode 30, which is connected via an ignition cable 31 to an ignition transformer, not shown.
  • the ignition electrode 30 is screwed into the burner head 12 in a gas-tight manner at an acute angle 35 of preferably 9 °.
  • the ignition electrode 30 is attached in a gas-tight manner by means of a stuffing box 33 and a pressure screw 34 which can be screwed into the burner head 12.
  • the ignition gas line 29 opens on the inflow side (arrow A) in front of the ignition chamber 37 at an acute angle 39 from preferably 21 ° into the cutting oxygen supply line 16.
  • the distance between the ignition space 37 and the ignition gas line 29 is designed such that the fuel gas oxygen mixture (ignition gas mixture) flowing out of the ignition gas line 29 is directed directly into the spark region between the counter electrode 38 and the ignition electrode 30.
  • the other end of the ignition gas line 29 is connected gas-tight to the valve body 11 via a capillary tube.
  • the ignition gas line 29 is led to the connecting piece 32 and the non-return valve 41 with a flame arrester via a connecting bore 29a arranged in the valve body 11.
  • the ignition gas line 29 runs back into the burner 10 via connecting piece 50 (connecting bore 29 b).
  • the ignition gas line 29 is connected there to the distribution channel 45 (see FIG. 2).
  • the distribution channel 45 supplies the heating slots of the nozzle (not shown in more detail) with the fuel gas / heating oxygen mixture which is introduced into the distribution channel 45 via the fuel gas / heating oxygen mixture feed line 23.
  • a dynamic pressure which is almost independent of the amount of fuel gas / heating oxygen mixture forms, so that the fuel gas / heating oxygen mixture automatically flows as a premixed pilot gas into the channel of the ignition gas line 29 arranged in the burner head 12 and opening into the distribution channel 45.
  • the pilot gas is led out of the cutting torch 10 in the direction of arrow 46 through the pilot gas line 29 designed as a capillary tube. It flows through a flame arrester 42, an addressing valve 47 (solenoid valve) and an adjusting valve 48 or an orifice to the non-return valve 41 with flame arrester and via the capillary tube arranged between the valve body 11 and the torch head 12 into the cutting torch 10 back. It is fed into the cutting oxygen feed line 16 opposite the ignition electrode 30 and ignited. The pilot flame emerges from the cutting oxygen channel of the nozzle and ignites the fuel gas / heating oxygen mixture emerging from the heating slots. The ignition process is controlled depending on the time and ends, for example, after 4 seconds.
  • the addressing valve 47 is closed, so that when the cutting oxygen is switched on there is no connection between the cutting oxygen supply line 16 and the fuel gas / heating oxygen mixture supply line.
  • the ignition gas mixture can also be taken directly from the injector or the subsequent fuel gas / heating oxygen mixture feed line 23.
  • the pilot gas mixture can be taken directly from the mixing room or from the subsequent mixture line.
  • the shut-off valve 47 can of course also be arranged inside the burner, for example at the outlet of the burner head at point 46.

Abstract

The burner has a valve body, a burner head, and a nozzle whose heating passage are connected via a distribution passage to a feed passage for the mixture of combustion gas and heating oxygen. The cutting-oxygen passage is connected to a feed passage for this oxygen, and the ignition-gas passage is connected to the distribution passage or the mixture feed passage. One or more valves (47) are incorporated in the ignition-gas passage (29). The valve can be preceded by a flame-trap (42) and followed by an adjusting valve (48) or baffle. The ignition-gas passage can be taken from the distribution passage (45) out of the valve body (11) and back into the burner and as far as the head (12), where it discharges into the feed passage (16) for the cutting oxygen.

Description

Die Erfindung betrifft einen Schneidbrenner nach dem Oberbegriff des Anspruches 1.The invention relates to a cutting torch according to the preamble of claim 1.

Mit thermischen Bearbeitungswerkzeugen, insbesondere mit Schneidbrennern, werden aus großflächigen Blechen einzelne Werkstücke ausgeschnitten, wobei der Schneidvorgang mit einer Brenngas-Heizsauerstoffflamme und einem Schneidsauerstoffstrahl ausgeführt wird. Mit der Brenngas-Heizsauerstoffflamme des Schneidbrenners wird das Werkstück auf seine Zündtemperatur, die unter dem Schmelzpunkt liegt, vorgewärmt. Durch Öffnen eines Ventiles wird Sauerstoff unter Druck zugeführt, worauf der Werkstoff verbrennt.With thermal processing tools, in particular with cutting torches, individual workpieces are cut out from large-area sheets, the cutting process being carried out with a fuel gas heating oxygen flame and a cutting oxygen jet. The workpiece is preheated to its ignition temperature, which is below the melting point, using the fuel gas heating oxygen flame from the cutting torch. By opening a valve, oxygen is supplied under pressure, whereupon the material burns.

Das Brenngas-Heizsauerstoffgemisch und der Schneidsauerstoffstrahl werden an Ventilen desSchneidbrenners eingestellt. Bei der normalen Einstellung des Brenngas-Heizsauerstoffgemisches werden Brenngas (z.B. Acetylen) und Sauerstoff im Verhältnis 1:1 gemischt. Im Injektor wird das Brenngas durch den strömenden Heizsauerstoff angesaugt und vermischt sich in der Mischdüse und der Brenngas-Heizsauerstoffzuleitung. Dieses Gasgemisch verbrennt nach dem Zünden an der Brennschneiddüse als Flamme.The fuel gas / heating oxygen mixture and the cutting oxygen jet are set on valves of the cutting torch. With the normal setting of the fuel gas / heating oxygen mixture, fuel gas (e.g. acetylene) and oxygen are mixed in a ratio of 1: 1. In the injector, the fuel gas is drawn in by the flowing heating oxygen and mixes in the mixing nozzle and the fuel gas / heating oxygen supply line. After ignition, this gas mixture burns as a flame at the flame cutting nozzle.

Zum Zünden des Brenngas-Heizsauerstoffgemisches haben sich innerhalb des Schneidbrenners angeordnete Zündeinrichtungen als vorteilhaft herausgestellt, da diese weniger verschmutzen und sich auch mit diesen Innenzündbrennern gegenüber sogenannten Außenzündbrennern keinerlei Kollisionsgefahren mit Werkstücken bzw. Werkstückvorrichtungen ergeben.Ignition devices arranged inside the cutting torch have proven to be advantageous for igniting the fuel gas / heating oxygen mixture, since they pollute less and there are also no collision risks with workpieces or workpiece devices with these internal ignition burners compared to so-called external ignition burners.

Es sind eine Vielzahl von Innenzündeinrichtungen bekannt geworden, die jeweils spezifische Vor- und Nachteile aufweisen.A large number of internal ignition devices have become known, each having specific advantages and disadvantages.

So werden bei einigen Zündeinrichtungen aus den Versorgungsleitungen für das Brenngas und den Heizsauerstoff jeweils separat Zündgase entnommen und in einem separaten Mischer gemischt (DE-OS 39 41 370, DE-OS 41 43 144, DE-OS 39 41 371) oder das Zündgas separaten Versorgungsquellen entnommen und zu einer Zündgasmengenregelvorrichtung geführt (DE-OS 3 52 79 55).In some ignition devices, ignition gases are taken separately from the supply lines for the fuel gas and the heating oxygen and mixed in a separate mixer (DE-OS 39 41 370, DE-OS 41 43 144, DE-OS 39 41 371) or the ignition gas separately Supply sources removed and led to an ignition gas quantity control device (DE-OS 3 52 79 55).

Weiterhin ist aus der US-PS 3,255,803 ein Schneidbrenner bekannt geworden, bei dem das Zündgas über eine Querbohrung von dem Heizkanal in den Schneidsauerstoff strömt und hier über eine Zündeinrichtung gezündet wird. Die Nachteile, die mit einer derartigen Querbohrung verbunden sind, nämlich Überschlag der Zündflamme in den Heizkanal und einseitige Beeinflußung der Heizflamme bei strömenden Schneidsauerstoff, sollen nach der DE-OS 35 16 511 durch eine in der Querbohrung angeordnete Gewindeschraube verhindert werden.Furthermore, a cutting torch has become known from US Pat. No. 3,255,803, in which the ignition gas flows from the heating channel into the cutting oxygen via a transverse bore and here via a Ignition device is ignited. The disadvantages associated with such a transverse bore, namely flashover of the pilot flame in the heating channel and unilateral influence on the heating flame when cutting oxygen is flowing, are to be prevented according to DE-OS 35 16 511 by a threaded screw arranged in the transverse bore.

Der Vorteil dieser Zündeinrichtungen besteht darin, daß dem Schneidbrenner das Zündgas bereits als ein vorgemischtes Brenngas-Heizsauerstoffgemisch entnommen wird und keine aufwendigen Regeleinrichtungen für das Zündgas erforderlich sind. Es wäre jedoch wünschenswert, wenn keine unmittelbare Verbindung zwischen den Heizkanälen und dem Schneidsauerstoffkanal der Düse vorhanden wäre, da insbesondere bei geringen Mischgasdrücken die Beeinflußung durch den Schneidsauerstoff zum Erlöschen der Heizflamme führen kann und Flammenrückschläge in den Heizkanal nicht ausgeschlossen werden können.The advantage of these ignition devices is that the ignition gas is already removed from the cutting torch as a premixed fuel gas / heating oxygen mixture and no complex control devices for the ignition gas are required. However, it would be desirable if there was no direct connection between the heating ducts and the cutting oxygen duct of the nozzle, since the influence of the cutting oxygen can lead to the extinguishing of the heating flame, in particular at low mixed gas pressures, and flashbacks in the heating duct cannot be ruled out.

Der Erfindung liegt daher die Aufgabe zugrunde, das dem Brenngas-Heizsauerstoffgemisch entnommene Zündgas so in die Schneidsauerstoffzuleitung zu leiten, daß eine Beeinflußung des Brenngas-Heizsauerstoffgemisches durch den Schneidsauerstoff oder die Zündflamme sicher ausgeschlossen werden kann.The invention is therefore based on the object of guiding the ignition gas removed from the fuel gas / heating oxygen mixture into the cutting oxygen feed line in such a way that the cutting oxygen or the pilot flame can be reliably prevented from influencing the fuel gas / heating oxygen mixture.

Diese Aufgabe wird bei einem gattungsgemäßen Verfahren durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved in a generic method by the characterizing features of claim 1. Advantageous developments of the invention are specified in the subclaims.

Gemäß der Erfindung ist an dem Verteilerkanal für die Heizkanäle der Schneiddüse eine Zündgasleitung angeschlossen, über die das vorgemischte Brenngas-Heizsauerstoffgemisch als Zündgas entnommen und zu der Schneidsauerstoffzuleitung geleitet wird. Dabei steht an der Entnahmestelle des zündfähigen Zündgases bei einem Flammenrückschlag in die Schneiddüse kein Zündgas mehr an, weil die Verbrennung des Brenngas-Heizsauerstoff-Gemisches in der durchmessergrößeren Brenngas-Heizsauerstoff-Gemischzuleitung stattfindet und somit kein Zündgas mehr zur Verfügung steht, das bei unkontrollierter Verbrennung im Zündsystem zu Beschädigungen führen könnte. Durch die in der Zündgasleitung angeordnete Armatur kann die Zündgasleitung geöffnet oder geschlossen werden. Somit ist die Verbindung zwischen dem Verteilerkanal und der Schneidsauerstoffzuleitung nur während des Zündvorganges geöffnet. Hierdurch kann der Schneidsauerstoff nicht in die Heizkanäle strömen und die Heizflamme beeinflussen. Vorteilhaft läßt sich das Zündgasgemisch durch ein Einstellventil auf jeden Schneidbrenner und auf jede Schneiddüse separat einregulieren, so daß Toleranzen z. B. in der Zündgasleitung oder den Einstellarmaturen für Brenngas und Heizsauerstoff, bzw. der Einstellung der Heizgase ausgeglichen werden können. Zur Geräuschminimierung kann das Zündgasvolumen an die jeweilige Schneiddüse angepaßt werden.According to the invention, an ignition gas line is on the distribution channel for the heating channels of the cutting nozzle connected via which the premixed fuel gas / heating oxygen mixture is removed as ignition gas and fed to the cutting oxygen feed line. There is no longer any ignition gas at the point of withdrawal of the ignitable ignition gas in the event of a flashback in the cutting nozzle, because the combustion of the fuel gas / heating oxygen mixture takes place in the larger diameter fuel gas / heating oxygen mixture supply line and therefore there is no longer any ignition gas which is available in the event of uncontrolled combustion could lead to damage in the ignition system. The valve can be opened or closed by the valve arranged in the pilot gas line. Thus, the connection between the distribution channel and the cutting oxygen supply line is only opened during the ignition process. As a result, the cutting oxygen cannot flow into the heating channels and influence the heating flame. The pilot gas mixture can advantageously be regulated separately by an adjusting valve on each cutting torch and on each cutting nozzle, so that tolerances such. B. in the pilot gas line or the adjustment fittings for fuel gas and heating oxygen, or the setting of the heating gases can be compensated. To minimize noise, the ignition gas volume can be adapted to the respective cutting nozzle.

Durch die Entnahme des Zündgases aus dem Verteilerkanal kann der Schneidbrenner bei Brenngasdrücken ab 0,2 bar betrieben werden, weil der im Verteilerkanal sich aufbauende Staudruck unabhängig von den Eingangsdrücken der Heizgase einen nahezu konstanten Wert aufweist, der ausreicht, daß das Zündgas mit erforderlichem Druck an dem einer Flammensperre nachgeschalteten Einstellventil ansteht und damit regelbar ist.By removing the pilot gas from the distributor channel, the cutting torch can be operated at fuel gas pressures of 0.2 bar or more, because the back pressure built up in the distributor channel has an almost constant value independent of the inlet pressures of the heating gases, which is sufficient for the pilot gas to be at the required pressure which is connected to a flame arrester downstream of the control valve and is therefore adjustable.

Der Schneidbrenner nach der Erfindung ist in hohem Maße sicher, da Flammenrückschläge der Zündflamme aufgrund der in der Zündgasleitung angeordneten Flammensperren nicht zu Flammenrückschlägen in den Verteilerkanal und Brenngas-Heizsauerstoff-Gemischzuleitung führen.The cutting torch according to the invention is highly safe, since flashbacks of the pilot flame do not lead to flashbacks in the distributor channel and fuel gas / fuel mixture feed line due to the flame arresters arranged in the pilot gas line.

Die Zündeinrichtung des Schneidbrenners ist einfach zu handhaben und wartungsarm und erfordert keine aufwendige Steuerung. Hinzu kommt, daß der Schneidbrenner ohne bauliche Änderung mit allen Brenngasen betrieben werden kann, weil der Schneidbrenner der Brenngasart entsprechend ausgelegt ist und das Zündgasgemisch der vorher im richtigen Verhältnis einregulierten Heizflamme entnommen und mengenmäßig über ein Einstellventil der Brennschneiddüse angepasst werden kann.The ignition device of the cutting torch is easy to use and requires little maintenance and does not require any complex control. In addition, the cutting torch can be operated with all fuel gases without structural changes, because the cutting torch is designed according to the type of fuel gas and the pilot gas mixture can be removed from the heating flame previously adjusted in the correct ratio and adjusted in quantity via an adjusting valve of the flame cutting nozzle.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgendem näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below.

Es zeigen

  • Fig. 1 eine schematische Teilschnittdarstellung des erfindungsgemäßen Schneidbrenners, bei dem aus Übersichtlichkeitsgründen die Brenngas-Heizsauerstoff-Gemischzuleitung im Brennerkörper nicht eingezeichnet ist.
  • Fig. 2 eine vergrößerte Darstellung des Brennerkopfes im Schnitt.
Show it
  • Fig. 1 is a schematic partial sectional view of the cutting torch according to the invention, in which, for reasons of clarity, the fuel gas / heating oxygen mixture feed line is not shown in the torch body.
  • Fig. 2 is an enlarged view of the burner head in section.

In Figur 1 ist im Teilschnitt ein Schneidbrenner 10 dargestellt, der im wesentlichen aus einem Ventilkörper 11, einem Brennerkopf 12, einem Injektor mit gasgemischführender Leitung und einem den Brennerkopf 12 mit dem Ventilkörper 11 verbindenden Führungsrohr 13 besteht. An dem Brennerkopf 12 wird eine nicht dargestellte Düse befestigt. Die Düse ist vorzugsweise zweiteilig und als Schlitzdüse ausgebildet. Die Heizdüse wird hierbei mittels einem an ihrem oberen Ende ausgebildeten Außengewinde in das Innengewinde 14 (Fig. 2) und die Schneiddüse in das Innengewinde 15 des Brennerkopfes 12 eingeschraubt.In Figure 1, a cutting torch 10 is shown in partial section, which essentially consists of a valve body 11, a burner head 12, an injector with a gas mixture-carrying line and a Burner head 12 with the valve body 11 connecting guide tube 13. A nozzle, not shown, is attached to the burner head 12. The nozzle is preferably in two parts and is designed as a slot nozzle. The heating nozzle is screwed into the internal thread 14 (FIG. 2) by means of an external thread formed at its upper end and the cutting nozzle into the internal thread 15 of the burner head 12.

Selbstverständlich ist es auch möglich, die Heizdüse und die Schneiddüse einteilig auszubilden, oder mittels einer nicht näher dargestellten Druckschraube am Brennerkopf 12 zu befestigen.Of course, it is also possible to form the heating nozzle and the cutting nozzle in one piece, or to fasten it to the torch head 12 by means of a pressure screw (not shown).

Der in der Mitte der Schneiddüse angeordnete Schneidkanal steht mit der Schneidsauerstoffzuleitung 16 des Brennerkopfes 12 in Verbindung. Die Schneidsauerstoffzuleitung 16 erstreckt sich über das Schneidsauerstoffrohr 17 bis in den Ventilkörper 11. Über eine in dem Ventilkörper 11 verlaufende nicht näher dargestellte Verbindungsbohrung ist die Schneiddüse mittels Anschluß 18 an die Schneidsauerstoffversorgungsquelle 19 angeschlossen. In der Schneidsauerstoffzuleitung 16 ist in Strömungsrichtung vor dem Anschlußstutzen 18 eine Rückströmsicherung mit Flamensperre 20 und ein Einstellventil 21 angeordnet, mit dem der Schneidsauerstoff eingestellt wird.The cutting channel arranged in the middle of the cutting nozzle is connected to the cutting oxygen supply line 16 of the torch head 12. The cutting oxygen supply line 16 extends over the cutting oxygen tube 17 into the valve body 11. The cutting nozzle is connected to the cutting oxygen supply source 19 by means of a connection 18 via a connecting bore (not shown in detail) in the valve body 11. In the cutting oxygen feed line 16, a backflow preventer with a flame barrier 20 and an adjusting valve 21, with which the cutting oxygen is adjusted, are arranged in the flow direction upstream of the connecting piece 18.

Der nicht näher dargestellte Schneidkanal der Schneiddüse, der Schneidsauerstoffkanal 16 und das Schneidsauerstoffrohr 17 sowie die nicht näher dargestellte Verbindungsbohrung zu dem Gewindestutzen 18 sind vorzugsweise innerhalb des Schneidbrenners 10 geradlinig ausgebildet und ermöglichen so vorteilhaft die Anordnung eines Sensors zur Flammenüberwachung im Schneidsauerstoffrohr / -kanal.The cutting channel of the cutting nozzle, not shown, the cutting oxygen channel 16 and the cutting oxygen tube 17 as well as the connecting bore, not shown, to the threaded connector 18 are preferably formed in a straight line within the cutting torch 10 and thus enable advantageously the arrangement of a sensor for flame monitoring in the cutting oxygen pipe / duct.

Die nicht dargestellte Heizdüse ist über die Brenngas-Heizsauerstoff-Gemischzuleitung 23 (Fig. 2) mit dem im Ventilkörper 11 angeordneten Injektor verbunden. Der nicht dargestellte Injektor ist über Anschlußstutzen 22, 26 für das Brenngas und den Heizsauerstoff, Einstellventile 43, 44 und Rückströmsicherungen 27 mit Flammensperren, 8 Flammensperren mit den Brenngas- und Heizsauerstoffversorgungsquellen 24, 9 verbunden. Das innerhalb des Führungsrohres 13 des Schneidbrenners 10 angeordnete und über den Injektor mit den Anschlußstutzen 22, 26 verbundene Brenngas-Heizsauerstoffgemischrohr 23 ist aus Übersichtsgründen in Figur 1 nicht dargestellt.The heating nozzle, not shown, is connected via the fuel gas / heating oxygen mixture feed line 23 (FIG. 2) to the injector arranged in the valve body 11. The injector, not shown, is connected via connecting pieces 22, 26 for the fuel gas and the heating oxygen, adjusting valves 43, 44 and non-return valves 27 with flame arresters, 8 flame arresters with the fuel gas and heating oxygen supply sources 24, 9. For the sake of clarity, the fuel gas / fuel mixture tube 23 arranged within the guide tube 13 of the cutting torch 10 and connected via the injector to the connecting pieces 22, 26 is not shown in FIG. 1.

Innerhalb des Schneidbrenners 10 ist eine elektrische Zündeinrichtung angeordnet, die in ihrer Gesamtheit mit 28 bezeichnet ist. Die elektrische Zündeinrichtung 28 besteht aus einer separaten Zündgasleitung 29 und einer Zündelektrode 30, die über ein Zündkabel 31 mit einem nicht näher dargestellten Zündtrafo verbunden ist. Die Zündelektrode 30 ist unter einem spitzen Winkel 35 von vorzugsweise 9° gasdicht in dem Brennerkopf 12 eingeschraubt.An electrical ignition device, which is designated 28 in its entirety, is arranged within the cutting torch 10. The electrical ignition device 28 consists of a separate ignition gas line 29 and an ignition electrode 30, which is connected via an ignition cable 31 to an ignition transformer, not shown. The ignition electrode 30 is screwed into the burner head 12 in a gas-tight manner at an acute angle 35 of preferably 9 °.

Nach einer weiteren bevorzugten Ausbildung wird die Zündelektrode 30 mittels einer Stopfbuchse 33 und einer in den Brennerkopf 12 einschraubbaren Druckschraube 34 gasdicht befestigt.According to a further preferred embodiment, the ignition electrode 30 is attached in a gas-tight manner by means of a stuffing box 33 and a pressure screw 34 which can be screwed into the burner head 12.

Auf der gegenüberliegenden Seite der Zündelektrode 30 mündet die Zündgasleitung 29 einströmseitig (Pfeil A) vor dem Zündraum 37 unter einem spitzen Winkel 39 von vorzugsweise 21° in die Schneidsauerstoffzuleitung 16. Der Abstand zwischen Zündraum 37 und Zündgasleitung 29 ist so ausgelegt, daß das aus der Zündgasleitung 29 strömende Brenngassauerstoffgemisch (Zündgasgemisch) direkt in den Funkenbereich zwischen Gegenelektrode 38 und Zündelektrode 30 gerichtet ist. Die Zündgasleitung 29 ist über ein Kapillarrohr mit ihrem anderen Ende gasdicht mit dem Ventilkörper 11 verbunden. Über eine in dem Ventilkörper 11 angeordnete Verbindungsbohrung 29a ist die Zündgasleitung 29 zu dem Anschlußstutzen 32 und der Rückströmsicherung 41 mit Flammensperre geführt. Nach der Rückströmsicherung 41 mit Flammensperre verläuft die Zündgasleitung 29 über Anschlußstutzen 50 zurück in den Brenner 10 (Verbindungsbohrung 29 b). Die Zündgasleitung 29 ist dort mit dem Verteilerkanal 45 (s. Fig 2) verbunden. Der Verteilerkanal 45 versorgt die Heizschlitze der nicht näher dargestellten Düse mit dem Brenngas-Heizsauerstoffgemisch, das über die Brenngas-Heizsauerstoff-Gemischzuleitung 23 in den Verteilerkanal 45 eingeleitet wird. In dem Verteilerkanal 45 bildet sich bei eingeschraubter Düse ein von der Brenngas-Heizsauerstoffgemisch-Menge nahezu unabhängiger Staudruck, so daß das Brenngas-Heizsauerstoffgemisch selbsttätig als vorgemischtes Zündgas in den im Brennerkopf 12 angeordneten und in den Verteilerkanal 45 mündenden Kanal der Zündgasleitung 29 strömt.On the opposite side of the ignition electrode 30, the ignition gas line 29 opens on the inflow side (arrow A) in front of the ignition chamber 37 at an acute angle 39 from preferably 21 ° into the cutting oxygen supply line 16. The distance between the ignition space 37 and the ignition gas line 29 is designed such that the fuel gas oxygen mixture (ignition gas mixture) flowing out of the ignition gas line 29 is directed directly into the spark region between the counter electrode 38 and the ignition electrode 30. The other end of the ignition gas line 29 is connected gas-tight to the valve body 11 via a capillary tube. The ignition gas line 29 is led to the connecting piece 32 and the non-return valve 41 with a flame arrester via a connecting bore 29a arranged in the valve body 11. After the non-return valve 41 with flame arrester, the ignition gas line 29 runs back into the burner 10 via connecting piece 50 (connecting bore 29 b). The ignition gas line 29 is connected there to the distribution channel 45 (see FIG. 2). The distribution channel 45 supplies the heating slots of the nozzle (not shown in more detail) with the fuel gas / heating oxygen mixture which is introduced into the distribution channel 45 via the fuel gas / heating oxygen mixture feed line 23. In the distribution channel 45, when the nozzle is screwed in, a dynamic pressure which is almost independent of the amount of fuel gas / heating oxygen mixture forms, so that the fuel gas / heating oxygen mixture automatically flows as a premixed pilot gas into the channel of the ignition gas line 29 arranged in the burner head 12 and opening into the distribution channel 45.

Das Zündgas wird durch die als Kapillarrohr ausgebildete Zündgasleitung 29 in Pfeilrichtung 46 aus dem Schneidbrenner 10 herausgeführt. Es strömt über eine Flammensperre 42, ein Adressierventil 47 (Magnetventil) und ein Einstellventil 48 oder eine Blende zu der Rückströmsicherung 41 mit Flammensperre und über das zwischen Ventilkörper 11 und Brennerkopf 12 angeordnete Kapillarrohr in den Schneidbrenner 10 zurück. Es wird in die Schneidsauerstoffzuleitung 16 gegenüber der Zündelektrode 30 eingespeist und gezündet. Die Zündflamme tritt aus dem Schneidsauerstoffkanal der Düse aus und zündet das aus den Heizschlitzen austretende Brenngas-Heizsauerstoffgemisch. Der Zündvorgang wird zeitabhängig gesteuert und ist beispielsweise nach 4 Sekunden beendet. Danach wird das Adressierventil 47 geschlossen, so daß beim Zuschalten des Schneidsauerstoffs keine Verbindung zwischen der Schneidsauerstoffzuleitung 16 und der Brenngas-Heizsauerstoff-Gemischzuleitung besteht. Das Zündgasgemisch kann auch direkt am Injektor oder der sich anschließenden Brenngas-Heizsauerstoff-Gemischzuleitung 23 entnommen werden. Bei Gleichdruckbrennern kann das Zündgasgemisch dem Mischraum direkt oder der sich anschließenden Gemischleitung entnommen werden. Das Absperrventil 47 kann selbstverständlich auch innerhalb des Brenners angeordnet sein, z.B. am Ausgang des Brennerkopfes an der Stelle 46.The pilot gas is led out of the cutting torch 10 in the direction of arrow 46 through the pilot gas line 29 designed as a capillary tube. It flows through a flame arrester 42, an addressing valve 47 (solenoid valve) and an adjusting valve 48 or an orifice to the non-return valve 41 with flame arrester and via the capillary tube arranged between the valve body 11 and the torch head 12 into the cutting torch 10 back. It is fed into the cutting oxygen feed line 16 opposite the ignition electrode 30 and ignited. The pilot flame emerges from the cutting oxygen channel of the nozzle and ignites the fuel gas / heating oxygen mixture emerging from the heating slots. The ignition process is controlled depending on the time and ends, for example, after 4 seconds. Then the addressing valve 47 is closed, so that when the cutting oxygen is switched on there is no connection between the cutting oxygen supply line 16 and the fuel gas / heating oxygen mixture supply line. The ignition gas mixture can also be taken directly from the injector or the subsequent fuel gas / heating oxygen mixture feed line 23. In the case of constant pressure burners, the pilot gas mixture can be taken directly from the mixing room or from the subsequent mixture line. The shut-off valve 47 can of course also be arranged inside the burner, for example at the outlet of the burner head at point 46.

Claims (3)

Schneidbrenner, bestehend aus einem Ventilkörper, einem Brennerkopf, und einer Düse, deren Heizkanäle über einen Verteilerkanal mit einer Brenngas-Heizsauerstoff-Gemischzuleitung verbunden ist und deren Schneidsauerstoffkanal mit einer Schneidsauerstoffzuleitung verbunden ist, in die eine Zündgasleitung mündet und die Zuleitungen mit Gasversorgungen verbunden sind,
dadurch gekennzeichnet,
daß die Zündgasleitung (29) mit dem Veteilerkanal (45) oder der Brenngas-Heizsauerstoff-Gemischzuleitung (23) verbunden ist und mindestens ein Ventil (47) in der Zündgasleitung (29) angeordnet ist.Cutting torch, consisting of a valve body, a torch head, and a nozzle, the heating channels of which are connected via a distribution channel to a fuel gas / heating oxygen mixture feed line and whose cutting oxygen channel is connected to a cutting oxygen feed line, into which a pilot gas line opens and the feed lines are connected to gas supplies,
characterized,
that the ignition gas line (29) is connected to the distributor channel (45) or the fuel gas / heating oxygen mixture feed line (23) and at least one valve (47) is arranged in the ignition gas line (29). Schneidbrenner nach Anspruch 1
dadurch gekennzeichnet,
daß in der Zündgasleitung (29) vor dem Ventil (47) eine Flammensperre (42) und nach dem Ventil (47) ein Einstellventil (48) oder eine Blende angeordnet ist.Cutting torch according to claim 1
characterized,
that a flame arrester (42) and after the valve (47) an adjusting valve (48) or an orifice is arranged in the ignition gas line (29) before the valve (47). Schneidbrenner nach einem der Ansprüche 1 und 2
dadurch gekennzeichnet,
daß die Zündgasleitung (29) von dem Verteilerkanal (45) bis aus dem Ventilkörper (11) heraus und in den Schneidbrenner (19) wieder zurück bis in den Brennerkopf (12) geführt ist, wo sie in die Schneidsauerstoffzuleitung (16) mündet.Cutting torch according to one of claims 1 and 2
characterized,
that the pilot gas line (29) from the distribution channel (45) out of the valve body (11) and in the cutting torch (19) back into the torch head (12), where it opens into the cutting oxygen supply line (16).
EP95108886A 1994-06-16 1995-06-09 Cutting torch Expired - Lifetime EP0687859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4420935A DE4420935C1 (en) 1994-06-16 1994-06-16 Cutting burner esp. for Oxyacetylene torch
DE4420935 1994-06-16

Publications (3)

Publication Number Publication Date
EP0687859A2 true EP0687859A2 (en) 1995-12-20
EP0687859A3 EP0687859A3 (en) 1997-05-14
EP0687859B1 EP0687859B1 (en) 2001-03-14

Family

ID=6520663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95108886A Expired - Lifetime EP0687859B1 (en) 1994-06-16 1995-06-09 Cutting torch

Country Status (2)

Country Link
EP (1) EP0687859B1 (en)
DE (2) DE4420935C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2837914A1 (en) 2002-03-29 2003-10-03 Air Liquide Ignition block for blow torch comprises, nozzle to deliver ignited gas mixture, electrode to ignite mixture, earthed return electrode, gas supply jet and means of attachment/detachment to blowtorch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326934A (en) * 1997-07-01 1999-01-06 Drax Torches Ltd Burners
FR2792395B1 (en) 1999-04-13 2001-07-13 Soudure Autogene Francaise IGNITION DEVICE FOR BURNER AND BURNER PROVIDED WITH SUCH A DEVICE
CN106002078B (en) * 2016-07-13 2017-11-03 江阴德玛斯特钻具有限公司 The deburring device of friction-welding machine
CN109631080B (en) * 2019-01-30 2023-11-07 徐慕庆 Automatic ignition device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255803A (en) 1962-08-23 1966-06-14 Harris Calorific Co Torch with igniter
DE3516511A1 (en) 1985-05-08 1986-11-13 Messer Griesheim Gmbh, 6000 Frankfurt Cutting torch
DE3527955A1 (en) 1985-08-03 1987-02-12 Messer Griesheim Gmbh CUTTING TORCH
DE3941371A1 (en) 1989-12-15 1991-06-20 Messer Griesheim Gmbh Torch ignition system for cutting or flame treating materials - has ignition circuit with ignition coil or gap in ignition space coupled to gas lines via electromagnetic valves
DE3941370A1 (en) 1989-12-15 1991-06-20 Messer Griesheim Gmbh METHOD FOR ENDING MAIN FLAME GASES FROM INDIVIDUAL CUTTING TORCHES
DE4143144A1 (en) 1991-12-28 1993-07-01 Gce Rhoena Autogengeraete Gmbh MACHINE CUTTING TORCH WITH INTERNAL IGNITION

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4235856A1 (en) * 1992-10-23 1994-05-05 Messer Griesheim Gmbh Method and thermal processing tool for igniting a fuel gas-heating oxygen mixture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255803A (en) 1962-08-23 1966-06-14 Harris Calorific Co Torch with igniter
DE3516511A1 (en) 1985-05-08 1986-11-13 Messer Griesheim Gmbh, 6000 Frankfurt Cutting torch
DE3527955A1 (en) 1985-08-03 1987-02-12 Messer Griesheim Gmbh CUTTING TORCH
DE3941371A1 (en) 1989-12-15 1991-06-20 Messer Griesheim Gmbh Torch ignition system for cutting or flame treating materials - has ignition circuit with ignition coil or gap in ignition space coupled to gas lines via electromagnetic valves
DE3941370A1 (en) 1989-12-15 1991-06-20 Messer Griesheim Gmbh METHOD FOR ENDING MAIN FLAME GASES FROM INDIVIDUAL CUTTING TORCHES
DE4143144A1 (en) 1991-12-28 1993-07-01 Gce Rhoena Autogengeraete Gmbh MACHINE CUTTING TORCH WITH INTERNAL IGNITION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2837914A1 (en) 2002-03-29 2003-10-03 Air Liquide Ignition block for blow torch comprises, nozzle to deliver ignited gas mixture, electrode to ignite mixture, earthed return electrode, gas supply jet and means of attachment/detachment to blowtorch

Also Published As

Publication number Publication date
EP0687859A3 (en) 1997-05-14
EP0687859B1 (en) 2001-03-14
DE59509086D1 (en) 2001-04-19
DE4420935C1 (en) 1995-07-20

Similar Documents

Publication Publication Date Title
DE825197C (en) Spray gun for pressurized gas spraying of meltable materials
DE3321697C2 (en)
DE19724861C1 (en) Gas burner especially used in domestic boiler
EP0907868A1 (en) Burner
DE4420935C1 (en) Cutting burner esp. for Oxyacetylene torch
EP0212190B1 (en) Device for cutting work pieces
DE2819108C2 (en) Device for igniting the heating gas of a machine cutting torch
DE3524773A1 (en) METHOD FOR AUTOMATICALLY WATCHING A FLAME
DE1008534B (en) Fuel evaporation device for gas turbines
DE3827750C2 (en)
DE4143144C2 (en) Machine cutting torch with internal ignition device
DE3516511A1 (en) Cutting torch
EP0432522A2 (en) Method for igniting the main gas supply to individual cutting torches
DE3624504C1 (en) Cutting torch with a nozzle, in particular block cutting nozzle
DE3941371A1 (en) Torch ignition system for cutting or flame treating materials - has ignition circuit with ignition coil or gap in ignition space coupled to gas lines via electromagnetic valves
DE19542373A1 (en) Burner head for gas burner
DE2819132C2 (en) Gas-mixing cutting torch
DE4235856A1 (en) Method and thermal processing tool for igniting a fuel gas-heating oxygen mixture
DE1112025B (en) Device for maintaining the composition of a mixture of air and combustible gas constant
DE3301355C2 (en) Jump start device for a high pressure combustion chamber
DE2547475A1 (en) Flame welding, cutting and metallizing torch - has afterburning gas port after central cutting and peripheral heating gas ports
DE820884C (en) Cutting torch
AT283082B (en) PROCESS AND TORCH FOR FLAME CUTTING LARGE MATERIAL THICKNESSES
DE19512762A1 (en) Igniting a torch, in particular, a machine-operated cutting torch
DE594172C (en) Gas burners for industrial furnaces

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19971114

17Q First examination report despatched

Effective date: 19990420

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 59509086

Country of ref document: DE

Date of ref document: 20010419

ITF It: translation for a ep patent filed

Owner name: DE DOMINICIS & MAYER S.R.L.

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20010612

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20100706

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20100621

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20100618

Year of fee payment: 16

Ref country code: DE

Payment date: 20100625

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110609

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110609

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20120229

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59509086

Country of ref document: DE

Effective date: 20120103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110630

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110609