EP0093048A2 - Brenner mit Funkenzündung - Google Patents

Brenner mit Funkenzündung Download PDF

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Publication number
EP0093048A2
EP0093048A2 EP83400790A EP83400790A EP0093048A2 EP 0093048 A2 EP0093048 A2 EP 0093048A2 EP 83400790 A EP83400790 A EP 83400790A EP 83400790 A EP83400790 A EP 83400790A EP 0093048 A2 EP0093048 A2 EP 0093048A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
torch
head
torch head
spark
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Withdrawn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
EP83400790A
Other languages
English (en)
French (fr)
Other versions
EP0093048A3 (de
Inventor
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 JP5915782U external-priority patent/JPS58165460U/ja
Priority claimed from JP6922882A external-priority patent/JPS58187727A/ja
Priority claimed from JP9276182U external-priority patent/JPS58194357U/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 EP0093048A2 publication Critical patent/EP0093048A2/de
Publication of EP0093048A3 publication Critical patent/EP0093048A3/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a torch or torch of the spark ignition type and, more particularly, to a torch comprising a head on which can be mounted a spark ignition nozzle and which is provided with a fixed piezoelectric block. in position and a corresponding striker.
  • torches of this type kinetic energy is applied to the striker in order to bring it suddenly into percussive contact with a first contact member of the piezoelectric block, the other contact member of which is held at the rear. Due to this percussion contact, the piezoelectric block generates an electromotive force, which is applied to the front end of the nozzle in order to produce a spark at this end and ignite a flowing mixture of combustion gases. by the end of the nozzle.
  • the Applicant has already proposed spark ignition torches where the rear end of the nozzle served as a percussion support for the piezoelectric block (see Fig. 1 and 2).
  • the piezoelectric block is shown in (18), a striker in (19), the torch head in (6) and the nozzle in (1).
  • the nozzle (1) is subdivided into an inner tube (31) and an outer tube (32), both electrically conductive.
  • the inner tube (31) is electrically isolated from the outer tube (32) by an insulator or an air gap, except at the end of the nozzle where spark electrodes (2, 3) are provided.
  • the piezoelectric block (18) is provided with an electrode (70) electrically connected to the spark electrode (3) via the torch head (6), with a locking nut (12) and the outer tube (32).
  • Another electrode (71) is connected to the spark electrode (2) via the inner tube (31).
  • the rear part of the inner tube (31) of the nozzle serves as a percussion support (72) of the piezoelectric block (18).
  • This support (72) also serves as an input electrode (43).
  • the nozzle (1) Since the nozzle (1) is replaced by a new nozzle when it is worn, it can be separated from the torch head (6).
  • the power supply part comprises the piezoelectric block (18) and the input electrode (43), the nozzle (1) is associated with the torch head (6) because the block (18 ) is part of the torch head (6) and the electrode (43) is part of the nozzle (1).
  • Torches of this type are also subject to another problem that arises when the torch is operated for lighting, when the nozzle is removed from the head. In this case, a spark emerges between the power supply electrodes and, in the presence of combustible gas, ignites the latter, which can cause ignition or accidental explosion in the torch head.
  • FIG. 3 is a schematic view of the circuit in question when the nozzle is in position
  • FIG. 4 is a diagram of the same circuit when the nozzle is removed.
  • ZO is the resistance of the nozzle, i.e. the total resistance between the spark electrodes and the input electrodes (between 2 and 4, and between 3 and 5).
  • Z1 is the resistance between the spark electrodes (2,3).
  • 22 is the resistance between the supply terminals (7, 8) of the torch head (6).
  • Z1 and Z2 can be considered as corresponding to an energy discharge gap.
  • An energy supply is indicated in (109).
  • the voltage V of the power supply (109) is determined so as to produce a spark between the electrodes (2, 3), taking into account ZO + Z1.
  • the terminals (4, 7) are connected together, as are the terminals (5, 8). Of course, there is no spark between the terminals (4,7) or (5,8).
  • a nozzle (1) comprises an inner tube (31) and an outer tube (32), both electrically conductive.
  • the spark electrodes are indicated in (2, 3) and the input terminals in (4, 5).
  • the nozzle is fixed to a torch head (6) by a clamping nut (12).
  • the torch head (6) and the nut (12), both electrically conductive, are connected to a first electrode of the piezoelectric block (18).
  • the other electrode of the piezoelectric block (18) is electrically connected to the rear end of the inner tube (31) by direct contact therewith.
  • An electrical insulating member, shown in (10), is disposed between the inner tube (31) and the torch head (6), while the striker of the block (18) is shown in (19).
  • the striker (19) is brought into percussive contact on the piezoelectric block (18) by a gas pressure in order to generate an electromotive force.
  • the striker (19) is returned by a spring (22) and a magnet (24). The latter is attracted to a magnetic valve seat (23) to close the valve.
  • the block (18) must be provided with a gas passage channel (50).
  • the rear end of the inner tube (31) must also have a similar channel (51).
  • the locking nut (12) is tightened to keep the input terminal (5) of the rear end of the inner tube (31) in contact with the electrode of the piezo block. electric (18). If the nut is not properly tightened, for example as a result of dimensional errors between the members concerned, there is a faulty contact, which means that the current no longer flows to the spark electrode '( 3), at the end of the nozzle, or that very small sparks occur in the contact area. These small sparks cause a drop in spark energy at the electrodes (2, 3) or even misfire, which further increases the wear of the contact surfaces.
  • the piezoelectric block (18) or the insulator (10) may be damaged.
  • the conventional torch also has an additional disadvantage, namely that the channel (50) makes its structure complex.
  • the main object of the present invention is to produce a torch of the spark ignition type provided with a torch head with adaptable spark ignition nozzle, this head comprising a piezoelectric block fixed in position and a corresponding striker, and where a percussion support or anvil for the piezoelectric block is part of the torch head.
  • Another object of the present invention is to provide a torch where the member supporting the percussion applied to the piezoelectric block is part of the torch head, where the nozzle is provided with spark electrodes at its front end and rear input terminals, where the torch head is fitted with energy supply terminals which can be connected to the input terminals by introducing the nozzle into the torch head, and where the disruptive distance between the energy supply terminals is greater than the air gap allowing discharge when the nozzle is removed from the torch head.
  • Another object of the present invention is to make a torch where a support member for the percussion imprinted on the piezoelectric block forms part of the torch head, where an electrical insulating element defines a gas flow channel between an inner peripheral surface of the head and said insulator and is arranged around a helical spring intended to connect one of the supply terminals of the head, made of electrically conductive material, to the input terminal of the corresponding nozzle at this terminal, and where a passage is formed between the insulating element and the nozzle or in the insulating element itself in order to maintain the gas flow channel in communication with a gas flow channel provided in the nozzle.
  • the present invention overcomes all the drawbacks of the conventional torches described above.
  • the torch head (6) is internally provided with an insulating member (10) in the form of a frustoconical tube, pressed against the head (6) by a fixing nut (11).
  • a nozzle (1) is inserted into the torch head, in contact with the insulating member (10), and fixed in position by a locking nut (12).
  • the insulating member (10) is provided with holes (16) and (17) communicating respectively with the orifices (13) and (14).
  • a piezoelectric block (18) and a corresponding striker (19) are housed in a cavity (9), that is to say in an enlarged channel (20) for cutting oxygen.
  • an intermediate support member serving to support a compression spring (22) as well as the piezoelectric block (18).
  • the striker (19) is pressed against a valve seat (23) by the spring (22).
  • a magnet (24) fixed to the striker (19) is held in the attraction position against the valve seat (23), which is made of a magnetic material.
  • a cap (25), provided with an O-ring seal (26) all around, is screwed into the torch head (6) and comes into contact with a contact member (27) which constitutes one of the block electrodes (18).
  • the cap (25) therefore serves as a percussion support member, that is to say an anvil.
  • the case (envelope) of the piezoelectric block (18) is made of an electrically insulating material.
  • a tube (29) surrounding a flat electrode (28) which constitutes the other electrode of the block (18) forms an integral part of the housing so as to project thereon perpendicularly to the block (18).
  • a clearance is provided between the tube (29) and the inner periphery (34) of the head to define the orifice or light of cutting oxygen (15), as well as between the insulating member (10) and the tube (29).
  • Cutting oxygen is supplied through a channel (35) surrounding the striker (19), by a channel (36) arranged in the intermediate support member (21), then by the aforementioned games.
  • the inner tube (31) is electrically insulated from an outer tube (32) by a set or an insulator.
  • the oxygen pressure acts on the striker (19).
  • the striker (19) strikes a contact member (37) of the piezoelectric block (18), so that the piezoelectric elements of the block (18 ) generate an electromotive force which is applied to the front end of the nozzle (1) in order to produce a spark between the electrodes (2, 3) of the end of the nozzle.
  • the spark ignites the combustible gas mixture which is already flowing out of the end of the nozzle (1).
  • the percussion support that is to say the cap (25),) supports the percussion force applied by the striker (19) on the block (18). This force does not act directly on the inner tube (31) of the nozzle.
  • the purpose of the spring (30) is to provide the electrical connection between the inner tube (31) and the flat electrode (28) when the nozzle (1) is fixed to the torch head (6).
  • the helical spring (30) of electrically conductive metal is screwed into the inner tube (31) and is therefore fixed to the nozzle (1).
  • the spring (30) corresponds to the input terminal (5). It is in contact with the flat electrode (28), that is to say with the electrical supply terminal (8).
  • the outer tube (32) comprises a part (33) in contact with the clamping nut (12) and which corresponds to the other input terminal (4).
  • the torch head (6) comprises a part (33 ') in contact with the nut (12) and electrically connected to the contact member or electrode (27) of the block (18) through the cap (25). This part (33 ') corresponds to the other electrical supply terminal (7).
  • the inner tube (31) is of course electrically insulated from the outer tube (32) by an insulating material or an air gap.
  • This tube (31) is made of copper or a similar conductive material i and electrically connects the terminal (5) to the electrode (3). This is also true for the outer tube (32).
  • the conventional arrangement in which the tube (29) is absent implies a risk of combustion or explosion, as has already been said, since sparks are formed between the flat electrode (28) (i.e. terminal (8)) and a part a, b, c, d or similar, identified by a cross (x).
  • the spring (30) provides the electrical connection between the inner tube (31) and the flat electrode (28) when the nozzle (1) is fixed to the torch head (6).
  • an insulating tube (29) creates the necessary disruptive distance.
  • the "male" blade (38) can be produced in the form of a thin rod so as to be widely spaced from the surrounding areas, such as for example the parts marked (x) a, b, c and d (FIG. 7), which can form a spark electrode, and constitute the necessary disruptive distance in the form of a separation in space in place of the tube (29).
  • the power supply (109) is not limited only to a piezoelectric block; battery or power supply is also possible.
  • the helical spring (30) of conductive metal is screwed into the inner tube (31) and is therefore fixed to the nozzle (1).
  • This helical spring (30) connects the input terminal (5) of the rear end of the inner tube (31) to the flat electrode (28) which serves as a supply terminal (8).
  • the inner tube (31) is electrically isolated from the outer tube (32) by electrically insulating members (44, 45) and by a gas mixture passage channel (46) which forms a space.
  • Fig. 10 shows another embodiment of the invention where the direction of percussion of a striker (19) on a piezoelectric block (18) coincides with the direction of the axis of the nozzle (1), the block ( 18) resting on an interior shoulder of the torch head.
  • the embodiment in question has the same construction as the first form.
  • Fig. 11 shows a modification similar to the embodiment of FIG. 10, except that the helical spring (30) is fixed to the piezoelectric block (18).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Lighters Containing Fuel (AREA)
  • Arc Welding In General (AREA)
EP83400790A 1982-04-22 1983-04-21 Brenner mit Funkenzündung Withdrawn EP0093048A3 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP59157/82 1982-04-22
JP5915782U JPS58165460U (ja) 1982-04-22 1982-04-22 スパ−ク着火式ト−チ
JP6922882A JPS58187727A (ja) 1982-04-23 1982-04-23 スパ−ク着火式ト−チ
JP69228/82 1982-04-23
JP92761/82 1982-06-21
JP9276182U JPS58194357U (ja) 1982-06-21 1982-06-21 スパ−ク着火式ト−チ

Publications (2)

Publication Number Publication Date
EP0093048A2 true EP0093048A2 (de) 1983-11-02
EP0093048A3 EP0093048A3 (de) 1984-03-28

Family

ID=27296789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400790A Withdrawn EP0093048A3 (de) 1982-04-22 1983-04-21 Brenner mit Funkenzündung

Country Status (3)

Country Link
EP (1) EP0093048A3 (de)
AU (1) AU1383383A (de)
FR (1) FR2525739A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019174451A1 (zh) * 2018-03-16 2019-09-19 徐慕庆 一种割嘴
CN115978579A (zh) * 2023-02-21 2023-04-18 温州市日康机械科技厂 一种点火枪的喷火装置以及一种点火枪

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646584C3 (de) * 1976-10-15 1979-04-05 Braun Ag, 6000 Frankfurt Hochspann ungserzeugungsvorrichtung
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019174451A1 (zh) * 2018-03-16 2019-09-19 徐慕庆 一种割嘴
CN115978579A (zh) * 2023-02-21 2023-04-18 温州市日康机械科技厂 一种点火枪的喷火装置以及一种点火枪

Also Published As

Publication number Publication date
AU1383383A (en) 1983-11-17
EP0093048A3 (de) 1984-03-28
FR2525739A1 (fr) 1983-10-28

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