US20120288809A1 - Hot air generator device with improved lighting - Google Patents

Hot air generator device with improved lighting Download PDF

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Publication number
US20120288809A1
US20120288809A1 US13/425,997 US201213425997A US2012288809A1 US 20120288809 A1 US20120288809 A1 US 20120288809A1 US 201213425997 A US201213425997 A US 201213425997A US 2012288809 A1 US2012288809 A1 US 2012288809A1
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US
United States
Prior art keywords
lighter
transformer
spark plug
burner
hot air
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.)
Abandoned
Application number
US13/425,997
Inventor
Francois Clement
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.)
Sefmat
Original Assignee
Sefmat
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 Sefmat filed Critical Sefmat
Assigned to SEFMAT reassignment SEFMAT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLEMENT, FRANCOIS
Publication of US20120288809A1 publication Critical patent/US20120288809A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • 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

Definitions

  • the present invention relates to a burner/hot air generator device with a riser usable, in particular but not exclusively, for low-temperature heating of a plastic film, for example a polyethylene film for the retraction thereof using a gas flow coming from the combustion of a combustible gas such as propane or air or to place thermoplastic material on the ground.
  • a combustible gas such as propane or air or to place thermoplastic material on the ground.
  • the invention more particularly relates to a burner of the type previously described equipped with a riser consisting of a generally tubular element, potentially telescoping, able to insert itself between the injection device and the burner head, of the device.
  • the riser is made from an electrically conductive material and is connected to the ground of the electric generator (piezoelectric).
  • the conductor which passes into the riser to connect the outlet of the electric generator to a lighting electrode (spark plug) arranged in the lighting chamber of the burner, constitutes, with the riser, a capacitor whereof the capacity depends on the length of the riser and the arrangement of the conductor inside said riser.
  • This capacitor has the drawback of absorbing a significant fraction of the electric charge delivered by the electric generator at the time of the lighting. The charge applied to the spark plug is therefore weakened.
  • the manufacturer is led to increase the shock on the lighter and/or the operator is led to strike the lighter several times, which considerably reduces its lifetime.
  • the invention more particularly aims to eliminate these drawbacks. Furthermore, the invention must in particular have a reduced weight and bulk, so as to preserve the portability of the device, and to allow it to be used during long working periods.
  • the invention proposes a hot air generating device of the type comprising an injection device capable of producing a flow of a combustible gas mixture at a high speed and a burner head in which the flow is ignited via a spark plug positioned in said burner and electrically connected to a lighter, preferably a piezoelectric lighter, said device also comprising means to reduce the capacitive losses between the lighter and the spark plug.
  • This device also may or may not comprise a riser tube between the injection device and the burner.
  • the transformer is mounted near the lighter.
  • the transformer is preferably mounted at one end of the tube opposite the burner.
  • FIG. 1 is a view of a hot air generating device, supported by an operator
  • FIG. 2 illustrates an electric diagram for a device according to the invention.
  • the brackets are arranged to indicate in what zone of the device (gun 2 , tube 4 or burner 3 ) the corresponding part of the diagram is situated.
  • the device 1 comprises a spark plug 6 , arranged in the burner, to make it possible to ignite the gaseous mixture.
  • the spark plug 6 is supplied with a voltage generated by a piezoelectric lighter 7 arranged in the body of the gun 2 .
  • An electric connection between the lighter 7 and the spark plug 6 is ensured on the one hand by the riser tube 4 , connected to the ground of the lighter 7 , and on the other hand by a linear conductor 8 , kept at a distance inside the tube 4 .
  • a transformer 9 of the autotransformer type, is mounted in parallel with the lighter 7 .
  • the transformer 9 is used in a step-down transformer version, so that the voltage T 6 at the terminals of the spark plug 6 is lower than the voltage T 7 produced by the lighter 7 .
  • the voltage step-down can be such that the ratio T 6 /T 7 of the voltages is 2/3, or even 3/4; advantageously, this ratio can be provided to be reversible, for example 3/2 or 4/3.
  • the transformer has not been provided to operate at a constant rating, but rather only according to a regular pulse rating, upon each ignition.
  • the transformer is advantageously calculated so as to include an equivalent “parallel” capacity sufficient to make the voltage “creep,” i.e. to make the increase of the voltage T 6 more gradual at the terminals of the spark plug 6 , so as to reduce the capacitive losses, in particular between the conductor 8 and the tube 4 .
  • the transformer is mounted in the gun 2 , as close as possible to the lighter 7 .
  • the transformer can be mounted in a step-up voltage version.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Lighters Containing Fuel (AREA)

Abstract

A hot air generating device of the type including an injection device (2) capable of producing a flow of a combustible gas mixture at a high speed and a burner head (3) in which the flow is ignited via a spark plug (6) positioned near the burner (3) and electrically connected to a lighter (12), preferably a piezoelectric lighter, including an autotransformer mounted in parallel between the lighter and the spark plug. Such a device is particularly advantageous to facilitate the lighting of the mixture, in particular when the device is provided with a riser between the lighter and the spark plug.

Description

  • The present invention relates to a burner/hot air generator device with a riser usable, in particular but not exclusively, for low-temperature heating of a plastic film, for example a polyethylene film for the retraction thereof using a gas flow coming from the combustion of a combustible gas such as propane or air or to place thermoplastic material on the ground.
  • The invention more particularly relates to a burner of the type previously described equipped with a riser consisting of a generally tubular element, potentially telescoping, able to insert itself between the injection device and the burner head, of the device.
  • Such a device is in particular described in patent FR 2 907 882.
  • One problem results from the fact that the riser is made from an electrically conductive material and is connected to the ground of the electric generator (piezoelectric). As a result, the conductor, which passes into the riser to connect the outlet of the electric generator to a lighting electrode (spark plug) arranged in the lighting chamber of the burner, constitutes, with the riser, a capacitor whereof the capacity depends on the length of the riser and the arrangement of the conductor inside said riser. This capacitor has the drawback of absorbing a significant fraction of the electric charge delivered by the electric generator at the time of the lighting. The charge applied to the spark plug is therefore weakened. To increase the voltage at the terminals of the spark plug, the manufacturer is led to increase the shock on the lighter and/or the operator is led to strike the lighter several times, which considerably reduces its lifetime.
  • The invention more particularly aims to eliminate these drawbacks. Furthermore, the invention must in particular have a reduced weight and bulk, so as to preserve the portability of the device, and to allow it to be used during long working periods.
  • To that end, the invention proposes a hot air generating device of the type comprising an injection device capable of producing a flow of a combustible gas mixture at a high speed and a burner head in which the flow is ignited via a spark plug positioned in said burner and electrically connected to a lighter, preferably a piezoelectric lighter, said device also comprising means to reduce the capacitive losses between the lighter and the spark plug.
  • This device also may or may not comprise a riser tube between the injection device and the burner.
  • The means for reducing losses comprise means to make the increase in the voltage at the terminals of the spark plug more gradual; in particular, they can be a transformer, of the autotransformer type, mounted in parallel with the lighter.
  • Preferably, the transformer is mounted as a step-down transformer. A piezoelectric lighter can easily produce a voltage peak of 14 kV, or even 20 kV, whereas a voltage of 8 kV is generally sufficient at the terminals of the spark plug to ignite the gaseous mixture.
  • Advantageously, the transformer is mounted near the lighter. In particular, if the device comprises a riser tube, the transformer is preferably mounted at one end of the tube opposite the burner.
  • Several embodiments of the invention are described hereafter, as non-limiting examples, in reference to the appended figures, in which:
  • FIG. 1 is a view of a hot air generating device, supported by an operator; and
  • FIG. 2 is an electric diagram of a lighting circuit according to the invention, adapted in particular to equip the device of FIG. 1.
  • In the example shown in FIG. 1, the device 1 comprises an injection device, in the form of a gun 2, able to transmit a flow of combustible gaseous mixture to the head of the burner 3. The gun 2 and the burner 3 are connected to each other by a riser tube 4. The tube 4 is generally made from aluminum, in particular to limit the weight thereof. In certain device models, such a tube 4 can make it possible to offset the burner 3 at a distance of about two meters from the gun 2.
  • FIG. 2 illustrates an electric diagram for a device according to the invention. The brackets are arranged to indicate in what zone of the device (gun 2, tube 4 or burner 3) the corresponding part of the diagram is situated.
  • In the illustrated example, the device 1 comprises a spark plug 6, arranged in the burner, to make it possible to ignite the gaseous mixture. The spark plug 6 is supplied with a voltage generated by a piezoelectric lighter 7 arranged in the body of the gun 2. An electric connection between the lighter 7 and the spark plug 6 is ensured on the one hand by the riser tube 4, connected to the ground of the lighter 7, and on the other hand by a linear conductor 8, kept at a distance inside the tube 4.
  • According to the invention, a transformer 9, of the autotransformer type, is mounted in parallel with the lighter 7. In the example illustrated in FIG. 2, the transformer 9 is used in a step-down transformer version, so that the voltage T6 at the terminals of the spark plug 6 is lower than the voltage T7 produced by the lighter 7. Thus, the voltage step-down can be such that the ratio T6/T7 of the voltages is 2/3, or even 3/4; advantageously, this ratio can be provided to be reversible, for example 3/2 or 4/3.
  • It will be noted that in the usage made thereof, the transformer has not been provided to operate at a constant rating, but rather only according to a regular pulse rating, upon each ignition. The transformer is advantageously calculated so as to include an equivalent “parallel” capacity sufficient to make the voltage “creep,” i.e. to make the increase of the voltage T6 more gradual at the terminals of the spark plug 6, so as to reduce the capacitive losses, in particular between the conductor 8 and the tube 4. For better effectiveness, the transformer is mounted in the gun 2, as close as possible to the lighter 7.
  • Of course, the invention is not limited to the preferred embodiments just described, but on the contrary is defined by the claims that follow.
  • One skilled in the art will in fact see that various modifications can be made to the embodiments described above, in light of the teaching just disclosed.
  • Thus, the transformer can be mounted in a step-up voltage version.

Claims (11)

1. A hot air generating device of the type comprising an injection device (2) capable of producing a flow of a combustible gas mixture at a high speed and a burner head (3) in which the flow is ignited via a spark plug (6) positioned near said burner (3) and electrically connected to a lighter (7), preferably a piezoelectric lighter,
characterized in that it also comprises means (9) to reduce the capacitive losses between the lighter and the spark plug.
2. The device according to claim 1, characterized in that it comprises a riser tube between the injection device (2) and the burner (3).
3. The device according to claim 1, characterized in that the means (9) for reducing losses comprise means to make the increase in the voltage (T6) at the terminals of the spark plug (6) more gradual.
4. The device according to claim 3, characterized in that the means (9) for reducing losses comprise a transformer (9), of the autotransformer type, mounted in parallel with the lighter (7).
5. The device according to claim 4, characterized in that the transformer (9) is mounted as a step-down transformer.
6. The device according to claim 4, characterized in that the transformer (9) is mounted near the lighter (7).
7. The device according to claim 2, characterized in that the means (9) for reducing losses comprise means to make the increase in the voltage (T6) at the terminals of the spark plug (6) more gradual.
8. The device according to claim 7, characterized in that the means (9) for reducing losses comprise a transformer (9), of the autotransformer type, mounted in parallel with the lighter (7).
9. The device according to claim 8, characterized in that the transformer (9) is mounted as a step-down transformer.
10. The device according to claim 5, characterized in that the transformer (9) is mounted near the lighter (7).
11. The device according to claim 10, characterized in that the transformer (9) is mounted near the lighter (7).
US13/425,997 2011-05-13 2012-03-21 Hot air generator device with improved lighting Abandoned US20120288809A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1154143A FR2975168B1 (en) 2011-05-13 2011-05-13 HOT AIR GENERATING APPARATUS WITH IMPROVED IGNITION.
FR1154143 2011-05-13

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EP (1) EP2522904A1 (en)
FR (1) FR2975168B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120288808A1 (en) * 2011-05-11 2012-11-15 Sefmat Hot air generator burner with interchangeable lighter
USD972384S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun
USD972385S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL3770498T3 (en) * 2019-07-22 2023-12-04 Gnali Bocia S.R.L. Portable gas tool

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US3762856A (en) * 1972-04-05 1973-10-02 Tele Conn Enterprises Inc Burner ignition control system
US3813581A (en) * 1973-09-21 1974-05-28 Cam Stat Inc Spark igniter for a plurality of gas burners
US5156542A (en) * 1990-06-05 1992-10-20 Develop, Reiner Hannen & Cie Heat gun
US5907239A (en) * 1994-11-14 1999-05-25 Citeq Methods of enhancing capacity of transformer equipment and of power flow control using phase-shifting transformers and series impedances in parallel arrangements
US6010329A (en) * 1996-11-08 2000-01-04 Shrinkfast Corporation Heat gun with high performance jet pump and quick change attachments
US6320297B1 (en) * 1997-10-07 2001-11-20 Fev Motorentechnik Gmbh & Co. Kommanitgesellschaft Method for low loss control of a capacitive load, in particular of a piezoelectric actuator
US6603383B2 (en) * 2000-12-22 2003-08-05 Telefonaktiebolaget Lm Ericsson (Publ) Multilayer balun transformer structure
US20040041678A1 (en) * 2002-09-03 2004-03-04 Young Patrick H. Metalized polyester film with heat-seal layer on opposite side for flyback transformer application
US20040090388A1 (en) * 2000-12-27 2004-05-13 Mahr Ulrich E Cassegrain-type feed for an antenna
US20050001513A1 (en) * 2003-06-18 2005-01-06 Marlex Engineering Inc. Low voltage low loss piezoelectric driver and switching apparatus
US20050190517A1 (en) * 2002-09-20 2005-09-01 Siemens Ag Osterreich Switching power supply unit
US20070114978A1 (en) * 2003-09-26 2007-05-24 Abb Research Ltd System for transmission of electric power
US20070178766A1 (en) * 2006-01-31 2007-08-02 Intel Corporation Passive impedance equalization of high speed serial links
US20080241781A1 (en) * 2005-10-28 2008-10-02 Sefmat Rue De Betnoms Hot Air Internal Ignition Burner/Generator
US20090206804A1 (en) * 2008-02-20 2009-08-20 Ming Xu Quasi-Parallel Voltage Regulator
US20100075266A1 (en) * 2006-10-31 2010-03-25 Sefmat Burner/hot air generator apparatus of the extender type
US20100286686A1 (en) * 2007-09-25 2010-11-11 Christopher Paul Hancock Surgical resection apparatus
US20100328969A1 (en) * 2008-02-15 2010-12-30 Kasper Sinding Meyer Resonant power converter comprising a matched piezoelectric transformer
US20120288808A1 (en) * 2011-05-11 2012-11-15 Sefmat Hot air generator burner with interchangeable lighter
US20130089824A1 (en) * 2010-05-20 2013-04-11 Bo Winterskov Heating And Cleaning Apparatus For Surface Treatment
US20130208393A1 (en) * 2009-05-08 2013-08-15 Federal-Mogul Ignition Company Corona ignition with self-tuning power amplifier
US20130230816A1 (en) * 2012-03-02 2013-09-05 Pro-Iroda Industries, Inc. Hot Air Blower

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1272790A (en) * 1959-11-18 1961-09-29 Wasagchemie Ag Ignition device using a piezoelectric ignition generator
FR2665253A1 (en) * 1990-07-24 1992-01-31 Aerospatiale Piezoelectric ignition device for the actuation of an electrical resistance-wire igniter

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762856A (en) * 1972-04-05 1973-10-02 Tele Conn Enterprises Inc Burner ignition control system
US3813581A (en) * 1973-09-21 1974-05-28 Cam Stat Inc Spark igniter for a plurality of gas burners
US5156542A (en) * 1990-06-05 1992-10-20 Develop, Reiner Hannen & Cie Heat gun
US5907239A (en) * 1994-11-14 1999-05-25 Citeq Methods of enhancing capacity of transformer equipment and of power flow control using phase-shifting transformers and series impedances in parallel arrangements
US6010329A (en) * 1996-11-08 2000-01-04 Shrinkfast Corporation Heat gun with high performance jet pump and quick change attachments
US6320297B1 (en) * 1997-10-07 2001-11-20 Fev Motorentechnik Gmbh & Co. Kommanitgesellschaft Method for low loss control of a capacitive load, in particular of a piezoelectric actuator
US6603383B2 (en) * 2000-12-22 2003-08-05 Telefonaktiebolaget Lm Ericsson (Publ) Multilayer balun transformer structure
US20040090388A1 (en) * 2000-12-27 2004-05-13 Mahr Ulrich E Cassegrain-type feed for an antenna
US20040041678A1 (en) * 2002-09-03 2004-03-04 Young Patrick H. Metalized polyester film with heat-seal layer on opposite side for flyback transformer application
US20050190517A1 (en) * 2002-09-20 2005-09-01 Siemens Ag Osterreich Switching power supply unit
US20050001513A1 (en) * 2003-06-18 2005-01-06 Marlex Engineering Inc. Low voltage low loss piezoelectric driver and switching apparatus
US20070114978A1 (en) * 2003-09-26 2007-05-24 Abb Research Ltd System for transmission of electric power
US20080241781A1 (en) * 2005-10-28 2008-10-02 Sefmat Rue De Betnoms Hot Air Internal Ignition Burner/Generator
US20070178766A1 (en) * 2006-01-31 2007-08-02 Intel Corporation Passive impedance equalization of high speed serial links
US20100075266A1 (en) * 2006-10-31 2010-03-25 Sefmat Burner/hot air generator apparatus of the extender type
US20100286686A1 (en) * 2007-09-25 2010-11-11 Christopher Paul Hancock Surgical resection apparatus
US20100328969A1 (en) * 2008-02-15 2010-12-30 Kasper Sinding Meyer Resonant power converter comprising a matched piezoelectric transformer
US20090206804A1 (en) * 2008-02-20 2009-08-20 Ming Xu Quasi-Parallel Voltage Regulator
US20130208393A1 (en) * 2009-05-08 2013-08-15 Federal-Mogul Ignition Company Corona ignition with self-tuning power amplifier
US20130089824A1 (en) * 2010-05-20 2013-04-11 Bo Winterskov Heating And Cleaning Apparatus For Surface Treatment
US20120288808A1 (en) * 2011-05-11 2012-11-15 Sefmat Hot air generator burner with interchangeable lighter
US20130230816A1 (en) * 2012-03-02 2013-09-05 Pro-Iroda Industries, Inc. Hot Air Blower

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120288808A1 (en) * 2011-05-11 2012-11-15 Sefmat Hot air generator burner with interchangeable lighter
US9482430B2 (en) * 2011-05-11 2016-11-01 Sefmat Hot air generator burner with interchangeable lighter
USD972384S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun
USD972385S1 (en) * 2020-09-25 2022-12-13 Sefmat Shrink wrap gun

Also Published As

Publication number Publication date
FR2975168A1 (en) 2012-11-16
FR2975168B1 (en) 2013-08-16
EP2522904A1 (en) 2012-11-14

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Owner name: SEFMAT, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CLEMENT, FRANCOIS;REEL/FRAME:027960/0349

Effective date: 20120316

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION