WO2010059630A2 - Système d'allumage pour brûleur portatif - Google Patents

Système d'allumage pour brûleur portatif Download PDF

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Publication number
WO2010059630A2
WO2010059630A2 PCT/US2009/064807 US2009064807W WO2010059630A2 WO 2010059630 A2 WO2010059630 A2 WO 2010059630A2 US 2009064807 W US2009064807 W US 2009064807W WO 2010059630 A2 WO2010059630 A2 WO 2010059630A2
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
heat gun
diffuser
bore
tip
Prior art date
Application number
PCT/US2009/064807
Other languages
English (en)
Other versions
WO2010059630A3 (fr
WO2010059630A8 (fr
Inventor
Dimiter S. Zagoroff
Original Assignee
Zagoroff Dimiter S
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 Zagoroff Dimiter S filed Critical Zagoroff Dimiter S
Publication of WO2010059630A2 publication Critical patent/WO2010059630A2/fr
Publication of WO2010059630A8 publication Critical patent/WO2010059630A8/fr
Priority to US13/108,591 priority Critical patent/US9115890B2/en
Publication of WO2010059630A3 publication Critical patent/WO2010059630A3/fr

Links

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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/465—Details, e.g. noise reduction means for torches
    • 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
    • F23Q3/002—Igniters using electrically-produced sparks using piezoelectric elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2207/00—Ignition devices associated with burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2213/00—Burner manufacture specifications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • This invention relates to portable liquid propane gas (LPG) burners, which are used in a great variety of applications.
  • One application is as a heat gun, wherein pressurized gaseous fuel aspirates air for combustion in a jet pump and the combustion products entrain additional air to create a blast of hot air.
  • Such heat guns are commonly used to heat plastic to moderate temperatures to soften it for bending or to shrink it for packaging.
  • To shrink wrap large objects, such as boats it may be advantageous to lengthen the reach of the heat gun by mounting an extension between the jet pump and the burner.
  • the ignition system for such heat guns has to be able to adapt to ignite the burner with and without an extension.
  • Present gas-fired heat guns use a spark plug mounted at a side of a burner chamber, which may be difficult to light and also requires electrical wiring outside of the heat gun to power the spark plug.
  • the wiring must be long enough or include couplings and extension wires to accommodate an extension.
  • the spark plug and associated wiring add weight to the heat gun, making it harder to handle and manipulate.
  • the couplings and extension wires increase the likelihood of a short-circuit or of a failure of an electrical connection.
  • the present invention is an improvement for a heat gun, such as the heat gun described in U.S. Patent No. 3,917,442 or U.S. Patent No. 6,227,846, the contents of which are incorporated herein by reference.
  • a spark plug as used by prior art heat guns
  • embodiments of the present invention place an ignition electrode in a flame holder, which is in the flow path of the gas mixture burned by the heat gun.
  • a voltage applied to the electrode cause a spark to jump from an electrode tip at the flame holder to a portion of the body of the heat gun.
  • the spark may jump to the surface of the burner chamber of the flame holder.
  • the electrode may run through interior portions of the heat gun, such as a diffuser chamber to be electrically coupled to a voltage source.
  • the electrode is electrically isolated from other portions of the heat gun by insulators.
  • a ceramic insulator having a bore therethrough is fixed to the flame holder. As the flame holder is mounted to a main housing, the igniter electrode passes through the bore with the tip of the electrode exposed beyond the insulator.
  • the voltage source may be a piezo-electric element, a battery, or an external power source. Typically, the voltage source is actuated by a trigger mechanism.
  • an intermediate member with an electrode is placed on the electrode of the heat gun, and the electrode of the intermediate member passes through the bore of the ceramic insulator of the flam holder.
  • Fig. 1 is a cross-sectional side view of a first embodiment of a heat gun
  • Fig. 2 is a cross-sectional exploded perspective view of a second embodiment of a heat gun
  • Fig. 3 is a cross-sectional exploded side view of a third embodiment of a heat gun
  • Fig. 4 is a cross-sectional exploded side view of a fourth embodiment of a heat gun with an extension tube
  • Fig. 5 is a cross-sectional side view of a fifth embodiment of a heat gun with an extension tube
  • Fig. 6 is a cross-sectional side view of a sixth embodiment of a heat gun with an intermediate member between a short lead and a short insulator.
  • Fig. 1 shows a cross-sectional view of a heat gun 100 employing an ignition system according to an embodiment of the invention.
  • the heat gun 100 includes a handle 21, which houses a valve 22, an igniter 23 and a trigger 24.
  • a fuel line 25 leads from the valve 22 to the jet pump nozzle 26.
  • the jet pump nozzle 26 is located by a nozzle holder 27, which is supported by a pair of struts 28 inside the pump inlet 29.
  • the pump contains a bell-shaped inlet 30, a cylindrical mixing section 31 and a diffuser 32.
  • diffuser refers to either an expanding diffuser, such as expanding diffuser 32, or a constant cross-sectional area passageway, such as passageway 34 in Fig.
  • a burner chamber 38 with a flame holder 37 is attached to the pump outlet hub 33.
  • the burner chamber 38 is held in place by fastener 35 and the joint is sealed by O- ring seal 36 and can be disassembled from the pump easily by removing the fastener 35.
  • An electrode 40 mounts inside the pump along its center axis by an insulating lead-through 41 and connects to an igniter 23 by means of the igniter lead 42.
  • the igniter 23 may be a piezo-electric igniter that does not require an external power source. Alternatively, battery-powered igniters or igniters powered by external electrical sources may also be used.
  • the electrode 40 fits through a bore 44 of an insulator 39 that is mounted centrally on the flame holder 37.
  • the insulator may be an insert made of electrically insulating material, such as ceramic, as shown in FIG. 1.
  • the flame holder 37 may be made of an electrically insulating material, such as ceramic, and the bore is integral to the flame holder 37.
  • the tip 80 of electrode 40 passes through the insulator 39 and extends into the burner chamber 38 downstream of the flame holder 37.
  • Fig. 2 shows a burner chamber 38 of an embodiment of a heat gun 200 partially disassembled from the pump 202. By unscrewing the fastener 35, the burner chamber 38 can be readily removed from o-ring seal 36. As the burner chamber 38 is removed from the pump 202 and o-ring seal 36, the electrode 40 slides out of the insulator 39. Note that Fig.
  • the burner chamber 38 separating from the pump 202 before the electrode 40 fully separates from the insulator 39. This feature may ease assembly because it permits inserting the electrode 40 into the bore 44 before the burner chamber 38 slips over the pump outlet 33. The insertion of the electrode 40 into the insulator bore 44 is further facilitated by the tapered insulator counter bore 45.
  • the insulator 39 may be configured in the burner chamber 38 such that the burner chamber 38 interfaces with the pump 202 and o-ring seal 36 before the electrode 40 interfaces with the insulator 39.
  • Fig. 3 shows an embodiment of a heat gun 300 with a burner chamber 38 fully disassembled from the pump 302.
  • Fig. 3 shows electrode 40 with free tip end 304 extending from the end of the pump 302.
  • the free tip end 304 of the electrode 40 is inserted through the insulator bore 44 (and counter bore 45) before the burner chamber 38 interfaces with the pump 302 at o-ring seal 36.
  • the rear portion 34 of the burner chamber 38 may be lengthened such that the rear portion 34 interfaces with the o-ring seal 36 before the free tip end 304 of the electrode 40 interfaces with the insulator bore 44.
  • Fig. 4 shows an extension tube 50 for an embodiment of a heat gun according to an embodiment of the invention before its assembly.
  • an insulator 52 is mounted coaxially by means of struts 51.
  • Insulator 52 is fashioned similar to insulator 39 with a central bore 57 and a tapered counter bore 58.
  • An electrode 53 is mounted inside the bore 57 and leads to the outlet hub 54 end of the extension tube 50, where it is held in place centrally by the insulated strut 55. Electrode 53 extends beyond the outlet hub 54 end of the extension tube 50 by the same amount as the electrode 40 extends beyond the pump outlet 33.
  • the outlet hub 54 is similar to the pump outlet 33 with an O-Ring seal 56 and a quick-connect fastener 67 so that it can mate with the burner inlet 34 of the burner chamber 38.
  • the electrode 53 in the extension tube 50 fits through the bore 44 of the insulator 39 that is mounted centrally on the flame holder 37.
  • the tip 70 of electrode 53 passes through the insulator 39 and extends into the burner chamber 38 downstream of the flame holder 37.
  • Fig. 5 shows a heat gun according to an embodiment of the present invention with a pump 33, an extension tube 50, and a burner chamber 38 fully assembled.
  • the extension tube 50 extends the length of the pump outlet hub 33 to the burner chamber 38.
  • the free tip end (not shown in FIG. 5, but see 304 in FIG. 4) of electrode 40 presses against a tip end (not shown) of electrode 53 in the bore 57 of insulator 52.
  • electrode 40 and electrode 53 interfere when the extension tube 50 is in the fully-assembled state.
  • Electrode 40 is configured to flex slightly in the direction of the bell shaped inlet 30 in response to this interference.
  • This flexing has a spring force effect, which maintains the tip ends (not shown) of electrodes 40 and 53 in contact when the extension tube 50 is in the fully-assembled state.
  • the added pump length resulting from the extension tube 50 compared to a heat gun without an extension tube may cause the air/fuel mixture to take a longer amount of time to reach the burner chamber 38.
  • the igniter may have to create a spark for a longer period of time or be timed differently with respect to opening of the fuel valve as a result of a trigger pull.
  • Fig. 6 shows a heat gun according to an embodiment of the present invention, before its assembly, wherein the lead 140 in the pump outlet hub 33 is shorter than in other embodiments. Also, the insulator 142 in the burner chamber 38 of the embodiment in Fig. 6 is shorter than in other embodiments.
  • the embodiment of Fig. 6 includes an intermediate number 141 that includes an intermediate electrode 143 and a tubular portion 144.
  • the tubular portion 144 includes a bore 146 and counter bore 145.
  • the bore 146 and counter bore 145 are installed over the end of lead 140 such that an end of electrode 143 makes electrical contact with the lead 140.
  • the opposite end of electrode 143 passes through a bore 150 and counter bore 151 in insulator 142 when the burner chamber is installed on the pump outlet hub 33.
  • depressing the trigger 24 opens the valve 22 which sends pressurized gas to the nozzle 26.
  • the gas jet emanating from the nozzle 26 draws ambient air through the air inlet 29.
  • the gas and air mix in the mixing section 31 and the mixture is then pressurized in the diffuser 32.
  • the trigger 24 is depressed further, it activates the piezo-electric igniter 23, which sends a high voltage spike of electricity up through the lead 42 to the electrode 40 and creates a spark S at the tip of the electrode 40 that protrudes into the burner chamber 38, igniting the combustible mixture.
  • the burner chamber 38 has first to be removed as illustrated in Figs. 2 and 3.
  • the extension tube 53 is then mounted to the pump by first inserting the electrode 40 into the counter bore 59 of the insulator 52, then sliding the extension tube 53 over the pump outlet hub 33 and securing the joint with fastener 35. Then the burner chamber 38 is mounted to the outlet hub 54 of the extension tube 50. Again, the connection between the tip of the electrode 53 and the counter bore 44 of the insulator 39 is established first before the burner inlet 34 is inserted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Gas Burners (AREA)

Abstract

L'invention concerne un pistolet thermique chauffant au gaz dont l’allumage se fait à l’aide d’un bout d’électrode situé en aval d’un stabilisateur de flamme de telle sorte que le bout de l’électrode se trouve sur le passage du gaz qui s’écoule. L’électrode est reliée à une source de tension qui fait sauter une étincelle du bout de l’électrode à une autre partie du pistolet thermique, comme le stabilisateur de flamme ou un carter du pistolet thermique, lorsqu’on presse la détente, enflammant ainsi le gaz qui s’écoule. L’électrode est typiquement un fil métallique mince s’étendant à travers une partie d’un diffuseur définissant une partie du passage d’écoulement du gaz en amont du stabilisateur de flamme. L’électrode peut être continue du diffuseur à une extrémité terminale en aval du stabilisateur de flamme.
PCT/US2009/064807 2008-11-18 2009-11-17 Système d'allumage pour brûleur portatif WO2010059630A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/108,591 US9115890B2 (en) 2008-11-18 2011-05-16 Ignition system for portable LPG burner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19954108P 2008-11-18 2008-11-18
US61/199,541 2008-11-18

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/108,591 Continuation US9115890B2 (en) 2008-11-18 2011-05-16 Ignition system for portable LPG burner

Publications (3)

Publication Number Publication Date
WO2010059630A2 true WO2010059630A2 (fr) 2010-05-27
WO2010059630A8 WO2010059630A8 (fr) 2010-07-29
WO2010059630A3 WO2010059630A3 (fr) 2012-07-05

Family

ID=41668327

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/064807 WO2010059630A2 (fr) 2008-11-18 2009-11-17 Système d'allumage pour brûleur portatif

Country Status (2)

Country Link
US (1) US9115890B2 (fr)
WO (1) WO2010059630A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010111774A1 (fr) * 2009-04-03 2010-10-07 Shawcor Ltd. Procédé et dispositif pour le chauffage concentré de manchons rétractables
EP2568217A1 (fr) * 2011-09-09 2013-03-13 Guilbert Express Lance pour outil à main chauffant sans remontées de température le long de la tuyère

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU339776S (en) * 2011-09-23 2011-12-07 Sefmat Soc Par Actions Simplifiee A shrink wrap gun
US9562751B2 (en) 2014-01-31 2017-02-07 Harger, Inc. Portable ignition controller
US10590887B2 (en) 2016-05-20 2020-03-17 Alphaport, Inc. Spark exciter operational unit
FR3113717B1 (fr) * 2020-08-27 2022-08-26 Sefmat Dispositif d’injection de gaz pour un générateur d’air chaud
USD972385S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun
USD972384S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun
EP4033151B1 (fr) * 2021-01-20 2023-10-11 Pro-Iroda Industries, Inc. Outil à gaz avec efficacité d'allumage améliorée
US11933493B2 (en) 2021-01-22 2024-03-19 Pro-Iroda Industries, Inc. Tool with improved ignition efficiency
US11852342B2 (en) 2021-01-22 2023-12-26 Pro-Iroda Industries, Inc. Tool with improved ignition efficiency
WO2022169624A1 (fr) * 2021-02-02 2022-08-11 Hubbell Incorporated Système d'amorçage par arc pour un appareil de soudage exothermique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751053A1 (fr) * 1996-07-11 1998-01-16 Guilbert Express Sa Dispositif a combustion de gaz pour le chauffage de tubes
EP0841518A2 (fr) * 1996-11-08 1998-05-13 Shrinkfast Corporation Pistolet de projection à chaud avec une pompe à jet de haute performance et des parts à changement rapide
FR2764969A1 (fr) * 1997-06-23 1998-12-24 Applic Gaz Sa Appareil de gaz du type desherbeur thermique
WO2007048886A1 (fr) * 2005-10-28 2007-05-03 Sefmat Bruleur/generateur d'air chaud a allumage interne
FR2907882A1 (fr) * 2006-10-31 2008-05-02 Sefmat Sa Appareil bruleur/generateur d'air chaud a prolongateur

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US3187154A (en) * 1962-07-05 1965-06-01 Areair Company Electric arc-gas jet cutting and gouging torch
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US3878354A (en) * 1973-06-01 1975-04-15 Caterpillar Tractor Co Welding gun chuck assembly
US4181492A (en) * 1977-10-11 1980-01-01 Striker, Inc. Torch igniter
US4553927A (en) * 1984-02-13 1985-11-19 Collins Jr Raymond L Ignitor probe assembly and ceramic insulator therefor
FR2615271B1 (fr) * 1987-05-12 1990-03-16 Stepack Bruleur a gaz, de type a buse froide
US5278392A (en) * 1992-02-18 1994-01-11 Tomkins Industries, Inc. Self-cleaning nozzle for a gas welding torch
US5344314A (en) 1993-04-09 1994-09-06 Shrinkfast Marketing Turbine device for hot air generation
US6227846B1 (en) * 1996-11-08 2001-05-08 Shrinkfast Corporation Heat gun with high performance jet pump and quick change attachments
US6983550B1 (en) * 2004-07-26 2006-01-10 Arlo Lin Gas hot air gun

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751053A1 (fr) * 1996-07-11 1998-01-16 Guilbert Express Sa Dispositif a combustion de gaz pour le chauffage de tubes
EP0841518A2 (fr) * 1996-11-08 1998-05-13 Shrinkfast Corporation Pistolet de projection à chaud avec une pompe à jet de haute performance et des parts à changement rapide
FR2764969A1 (fr) * 1997-06-23 1998-12-24 Applic Gaz Sa Appareil de gaz du type desherbeur thermique
WO2007048886A1 (fr) * 2005-10-28 2007-05-03 Sefmat Bruleur/generateur d'air chaud a allumage interne
FR2907882A1 (fr) * 2006-10-31 2008-05-02 Sefmat Sa Appareil bruleur/generateur d'air chaud a prolongateur

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010111774A1 (fr) * 2009-04-03 2010-10-07 Shawcor Ltd. Procédé et dispositif pour le chauffage concentré de manchons rétractables
EP2568217A1 (fr) * 2011-09-09 2013-03-13 Guilbert Express Lance pour outil à main chauffant sans remontées de température le long de la tuyère
FR2979973A1 (fr) * 2011-09-09 2013-03-15 Guilbert Express Sa Lance pour outil a main chauffant sans remontees de temperature le long de la tuyere
CN102997237A (zh) * 2011-09-09 2013-03-27 吉尔贝快车股份有限公司 温度不沿着喷管上升的手工加热工具用的喷枪
US9310074B2 (en) 2011-09-09 2016-04-12 Guilbert Express Lance for heating hand tool without temperature rises along the nozzle
CN102997237B (zh) * 2011-09-09 2016-04-27 吉尔贝快车股份有限公司 温度不沿着喷管上升的手工加热工具用的喷枪

Also Published As

Publication number Publication date
US20110217662A1 (en) 2011-09-08
WO2010059630A3 (fr) 2012-07-05
US9115890B2 (en) 2015-08-25
WO2010059630A8 (fr) 2010-07-29

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