EP0093053A2 - Fackel mit Funkenzündung - Google Patents

Fackel mit Funkenzündung Download PDF

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Publication number
EP0093053A2
EP0093053A2 EP83400798A EP83400798A EP0093053A2 EP 0093053 A2 EP0093053 A2 EP 0093053A2 EP 83400798 A EP83400798 A EP 83400798A EP 83400798 A EP83400798 A EP 83400798A EP 0093053 A2 EP0093053 A2 EP 0093053A2
Authority
EP
European Patent Office
Prior art keywords
torch
inner tube
torch head
insulator
nozzle
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.)
Withdrawn
Application number
EP83400798A
Other languages
English (en)
French (fr)
Other versions
EP0093053A3 (de
Inventor
Tamotsu Kotani
Yosinori Kubota
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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
Priority claimed from JP5915582U external-priority patent/JPS58165458U/ja
Priority claimed from JP9276282U external-priority patent/JPS58194358U/ja
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0093053A2 publication Critical patent/EP0093053A2/de
Publication of EP0093053A3 publication Critical patent/EP0093053A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/002—Igniters using electrically-produced sparks using piezoelectric elements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/008—Structurally associated with fluid-fuel burners

Definitions

  • the present invention relates to a spark ignition type torch.
  • the spark ignition torch consists of a nozzle and an electrically conductive torch head which fixes the nozzle mounted inside.
  • the nozzle has an inner conductive tube and an outer conductive tube, mounted together so as to be electrically isolated from each other, the front end of which is provided with spark electrodes.
  • the torch of the present invention is primarily designed for flame cutting, it can also be useful for welding and gas shaping work. This torch operates manually or automatically. There are no limitations on the usable feed gas.
  • air gaps are provided between the inner and outer tubes, except in this area in order to avoid discharges.
  • air gap is used in context with a very general meaning and includes a separation in space, electrical insulators and combinations of these two possibilities.
  • the inner and outer tubes are mainly used as conductors for the spark electrodes and the torch head itself serves as a conductor for the outer tube. Consequently, to avoid a break in the insulation between the inner tube and the outer tube, except in the spark formation zone at the end of the nozzle, the inner tube must be electrically isolated from the torch head electrically connected to the outer tube.
  • the insulation of the inner tube from the torch head does not fall into the air gap category and needs to be limited to a simple insulator in order to prevent leaks and that the supply gas does not mix with the in the torch head. In other words, it is necessary for said insulator to provide a sealing function.
  • the inner tube (or the male end of a tube when the inner tube is provided with such a male end) has an insulator on the outer periphery opposite the female connector of the head nozzle blowtorch.
  • the insulator consists of a ceramic coating or bonded to the outer periphery. In each case, it is intended to permanently fix the insulator on the rear part of the nozzle.
  • the nozzles to be mounted on the torch must each include an insulator.
  • the nozzle is sensitive to detrimental thermal influences due to the flames and to the rupture of the insulation caused by the adhesion of the projections and, consequently, its lifetime is relatively short.
  • the nozzle must therefore be replaced frequently and is removable. It is uneconomical to provide such nozzles with an insulator (since the insulator will be discarded at the same time as the nozzle).
  • the insulator It is generally possible to remedy this problem by designing the insulator so that it can be adapted removably to the torch head, which implies high dimensional precision. It seems that ceramics and plastics can be useful for making such insulators.
  • the ceramic produced by firing has fine irregularities or undulations on the external and internal surfaces and must be subjected to polishing or rectification to remedy this.
  • This method nevertheless requires advanced skill and it is extremely difficult to achieve a precision finish.
  • Ceramics are therefore generally expensive, although they are not always suitable for preventing gas leaks.
  • the nozzle In order to keep the ceramic in compression contact with the surface of the socket and to compress the rear exterior surface of the inner tube against the ceramic, the nozzle is tightened with a nut, but if the tightening torque is too large, a crack will develop in the ceramic, resulting in gas leakage.
  • Synthetic resin could be useful as insulation instead of ceramic, but when the resin is softened, the tightening torque of the nut reduces the thickness of the insulator and can even cause insulation failure. When the resin is hard, the tightening torque may cause cracking or cracking. In the event of a flashback, the resin may be dangerously burnt out.
  • the nozzle of a conventional torch further comprises two tubular parts in addition to the inner and outer tubes and therefore requires to be composed of a certain number of parts. Its construction is complex because these tubular parts must also be isolated from each other.
  • the object of the present invention is to remedy the various drawbacks of conventional torches.
  • one of the objects of the invention is to produce a torch, of the spark ignition type, comprising a nozzle and an electrically conductive torch head holding the nozzle mounted inside, said nozzle fixedly.
  • a torch of the spark ignition type, comprising a nozzle and an electrically conductive torch head holding the nozzle mounted inside, said nozzle fixedly.
  • the insulator is of high dimensional accuracy and can be fixedly or removably mounted on the torch head.
  • the inner tube of the nozzle comprises an electrically conductive front part and a rear part connected together to form an oxygen circulation channel which passes through the two parts and makes the electrical connection between the two parts.
  • the inner tube and the outer tube have electrical insulating sleeves held between their opposite inner and outer surfaces, at least in the vicinity of their front ends and between the opposite surfaces of the outer tube and the rear part, over the entire surface in question.
  • the inner and outer tubes define between them a fuel gas circulation channel opposite the front insulating sleeve.
  • the rear area of the inner tube is provided with fuel gas supply channels and preheating oxygen communicating with the gas mixing channel.
  • Another object of the present invention is to produce a torch of the spark ignition type in which an inner tube forming part of the nozzle and a torch head comprise an electrical insulator interposed between the two members in order to ensure the electrical isolation of the tube. inside the torch head and seals between the insulator and the inner tube as well as between the insulator and the torch head, said insulator being produced for example in three parts or in one piece.
  • the torch comprises a nozzle (a) and an electrically conductive torch head (b) fixedly holding the nozzle (a) inserted inside, the latter comprising an inner conductive tube (1) and a tube conductive exterior (2) joined together so as to be electrically isolated from each other and provided with spark electrodes (3,4) at the front ends.
  • the torch head (b) is mounted in a nozzle holder socket (5) so that the electrically conductive part (6) keeps the outer tube (2) in contact with the torch head (b) and that 'An insulator (7) electrically separates said head (b) from the inner tube (1).
  • the insulator (7) is not fixed to the nozzle (a) but to the torch head (b).
  • the insulator (7) can be removably mounted to the nozzle (a) or to the torch head (b).
  • the insulator (7) can be designed so as to remain on the torch head (b) for continuous use when the nozzle (a) must be replaced as a result. of wear. (The insulator (7) generally has a longer useful life than that of the nozzle (a)). Consequently, an isolator (7) can be used with several nozzles (a), which differs from the usual practice where this isolator is thrown with the nozzle when the latter is replaced.
  • Figures 2 and 4 show a torch using LPG (propane gas) as the supply gas.
  • the inner tube (1) comprises a front part (10) and a rear part (11) joined together by screwing.
  • the flow channel (17) is annular.
  • the nozzle (a) is introduced into the socket (5) of the torch head (b) and is then blocked by a lock nut (21). This is conductive and constitutes the conductive part (6) with the front part (22) of the torch head (b).
  • the insulator (7) is frustoconical and made in one piece of ceramic.
  • the ceramic (7) is provided with holes (25) communicating with a window (24) for supplying preheating oxygen and with holes (27) communicating with a window for supplying gas (26).
  • Several holes (25,27) are usually arranged on the periphery of the ceramic while the latter may have only one hole (25.27).
  • the cutting oxygen inlet light is indicated in (28)
  • the ceramic (7) is fixed to the conical inner surfaces (29, 30, 31) of the socket (5) of the torch head (b) by gluing or any other process. However, it can be made removable without being fixed to the internal surfaces of the sleeve (5).
  • the electrode (3) is connected to an electrode (not shown) of a power supply (not shown) by the rear part of the inner tube (1).
  • the electrode (4) is connected to the other electrode (not shown) of the supply by means of the outer tube (2), the lock nut (21) and the torch head (b).
  • the power supply consists of a piezoelectric module housed in the torch head (b). It has been proposed to use the pressure of the cutting oxygen as the control energy of the piezoelectric module. Alternatively, a mechanical or manual percussive force applied from the outside or a compressive force can be used. In addition to the piezoelectric elements, it is also possible to use a battery or a commercial power supply.
  • Figures 3 and 4 show a torch operating on acetylene. Compared to the first embodiment, the latter has the following characteristic:
  • Insulators (12,41,13) are interposed between the inner tube (1) and the outer tube (2) on all of their opposite surfaces since acetylene gas is sensitive to flashback during walking and risks forming carbon deposits in the gas mixture passage channel (17). This deposit of carbon must be avoided because this product is a good conductor of electricity and may cause short circuits.
  • the second embodiment is similar to the first.
  • Figures 5 and 6 illustrate a nozzle (a), a torch head (b), a nozzle clamping nut (21), a piezoelectric module (34) serving as a block supply, a cutting oxygen window (28), a preheating oxygen window (24) and a supply gas lumen (26).
  • the nozzle (a) which is provided for acetylene comprises an inner tube (1), an outer tube (2) and the insulators (12,41,13) interposed between these organs.
  • the inner tube (1) is subdivided into a front part (10) and a rear part (11) joined by screwing.
  • the rear part (11) is provided with a preheating oxygen inlet (19) and a supply gas inlet (18).
  • the cutting oxygen circulation channel is indicated in (15) and we see in (16) a gas mixture circulation channel and in (3,4) a couple of spark electrodes.
  • the inner tube (1), the outer tube (2), the nut (21) which constitutes an example of a fixing member, as well as the torch head (b) are electrically conductive.
  • the electrical insulator (7) of the present embodiment includes a combination of the first, second and third insulators (52,53,54).
  • the seals (55, 56) include the parts (57 to 62) which are part of the first, second and third sets of seals (57.58; 59.60; 61.62).
  • the locking screw (71) tightens the third insulator (54) in the end-of-travel position.
  • the nozzle (a) is clamped in position by the clamping nut (21), so that the second insulator (53) is compressed at the end of its travel by means of the seal (59) and the first insulator (52 ) comes into an end position via the seal (57).
  • the piezoelectric module (34) comprises the assembly (72) provided with incorporated piezoelectric elements and a striker (73).
  • the negative electrodes (170) of the assembly (72) are electrically connected to the torch head (b) via the cap (74) and an intermediate support member (82).
  • the positive electrode (130) is connected to the inner tube (1) by a conductive coil spring (75) screwed into the inner tube (1).
  • the striker (73) is provided with a permanent magnet (76) which also serves as a cut-off member attracted towards a valve seat (77) made of magnetic material.
  • the return spring is indicated in (78).
  • Several gas passages (79) are arranged axially around the striker (73).
  • Figure 7 shows a modification which differs from the embodiment of Figures 5 and 6 in that the third insulator (54) has an L-shaped section, as do the first and second insulators (52,53).
  • Figure 8 shows another modification characterized by that the insulator (7) made in one piece, is provided with preheating oxygen holes (25) and feed gas passage holes (27) produced by molding and disposed peripherally therebetween.
  • Figure 9 shows another modification characterized in that the insulator (7), like those of the first and second embodiment is frustoconical. However, the modification differs from these embodiments since it includes seals (57 to 62).
  • Figure 10 shows another modification, characterized in that the insulator 7 is in the form of a straight cylinder. In this case, it is good to draw attention to the properties and dimensions of the seals (57 to 62) to avoid gas leaks.
  • the seals (55,56) can be made of rubber, synthetic resin or relatively soft metal, aluminum or zinc for example. It is possible to manufacture each of these seals (55, 56) in a single piece pierced with holes for passage of preheating oxygen and gas supply gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma Technology (AREA)
  • Insulators (AREA)
  • Spark Plugs (AREA)
EP83400798A 1982-04-22 1983-04-22 Fackel mit Funkenzündung Withdrawn EP0093053A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP59155/82 1982-04-22
JP5915582U JPS58165458U (ja) 1982-04-22 1982-04-22 スパ−ク着火式ト−チ
JP92762/82 1982-06-21
JP9276282U JPS58194358U (ja) 1982-06-21 1982-06-21 スパ−ク着火式ト−チ

Publications (2)

Publication Number Publication Date
EP0093053A2 true EP0093053A2 (de) 1983-11-02
EP0093053A3 EP0093053A3 (de) 1984-04-04

Family

ID=26400201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400798A Withdrawn EP0093053A3 (de) 1982-04-22 1983-04-22 Fackel mit Funkenzündung

Country Status (2)

Country Link
EP (1) EP0093053A3 (de)
FR (1) FR2527311B3 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142772A3 (en) * 1983-11-07 1986-05-21 Union Carbide Corporation Post-mixed spark-ignited burner
FR2588358A1 (fr) * 1985-10-08 1987-04-10 Air Liquide Module d'allumage piezo-electrique et bruleur utilisant un tel module
DE3938804A1 (de) * 1989-11-23 1991-05-29 Messer Griesheim Gmbh Schneidbrenner
EP0902234A3 (de) * 1997-09-15 1999-11-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Sitzeinsatz für Schneidsauerstoffbrennerkopf und Verfahren zur Verwendung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2378346A (en) * 1940-06-17 1945-06-12 Bastian Blessing Co Apparatus for mixing and burning fuel
FR1343579A (fr) * 1962-09-04 1963-11-22 Harris Calorific Co Chalumeau à allumoir
US4433358A (en) * 1981-08-18 1984-02-21 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Torch for cutting, welding or heating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142772A3 (en) * 1983-11-07 1986-05-21 Union Carbide Corporation Post-mixed spark-ignited burner
FR2588358A1 (fr) * 1985-10-08 1987-04-10 Air Liquide Module d'allumage piezo-electrique et bruleur utilisant un tel module
DE3938804A1 (de) * 1989-11-23 1991-05-29 Messer Griesheim Gmbh Schneidbrenner
EP0902234A3 (de) * 1997-09-15 1999-11-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Sitzeinsatz für Schneidsauerstoffbrennerkopf und Verfahren zur Verwendung

Also Published As

Publication number Publication date
FR2527311B3 (fr) 1985-02-22
FR2527311A1 (fr) 1983-11-25
EP0093053A3 (de) 1984-04-04

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Inventor name: KOTANI, TAMOTSU