[go: up one dir, main page]

EP2169309B1 - Hot-air generator - Google Patents

Hot-air generator Download PDF

Info

Publication number
EP2169309B1
EP2169309B1 EP09171318.0A EP09171318A EP2169309B1 EP 2169309 B1 EP2169309 B1 EP 2169309B1 EP 09171318 A EP09171318 A EP 09171318A EP 2169309 B1 EP2169309 B1 EP 2169309B1
Authority
EP
European Patent Office
Prior art keywords
gas
generator
pressure
air
servo
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.)
Not-in-force
Application number
EP09171318.0A
Other languages
German (de)
French (fr)
Other versions
EP2169309A1 (en
Inventor
Yves Guillou
Christophe Le Drappier
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.)
Guilbert Express
Original Assignee
Guilbert Express
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 Guilbert Express filed Critical Guilbert Express
Publication of EP2169309A1 publication Critical patent/EP2169309A1/en
Application granted granted Critical
Publication of EP2169309B1 publication Critical patent/EP2169309B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0052—Details for air heaters
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0324—With control of flow by a condition or characteristic of a fluid
    • Y10T137/0329—Mixing of plural fluids of diverse characteristics or conditions
    • Y10T137/0352—Controlled by pressure
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7793—With opening bias [e.g., pressure regulator]
    • Y10T137/7822—Reactor surface closes chamber
    • Y10T137/7823—Valve head in inlet chamber
    • Y10T137/7826—With valve closing bias

Definitions

  • the invention relates to a hot air generator.
  • a hot air generator is generally in the form of an elongate body longitudinally traversed by a conduit in which gas to ignite.
  • the body is extended by a generally hollow burner part into which the conduit opens.
  • the burner portion is provided at its free end with gas combustion means capable of igniting the gas.
  • gas combustion means capable of igniting the gas.
  • thermosetting, thermoformable, heat-shrinkable materials, heat-bonded materials and the like More generally, it can be used for heating thermosetting, thermoformable, heat-shrinkable materials, heat-bonded materials and the like.
  • such a hot air generator is advantageously used for laying or marking bitumen.
  • thermosetting waterproof material which is usually in the form of rolled strips.
  • the generator can still be used in the field of logistics and transport to retract the plastic films surrounding the pallets of goods.
  • the generator can also be used for space heating.
  • One solution to comply with the new legislation is to project compressed air to heat the flame while it is generated inside a furnace so that that it does not come out, in order to transfer the calories to the compressed air coming out of the generator in the hot state.
  • the material to be heated is not in contact with a flame but with hot air.
  • This solution has the disadvantage of generating a high cost of use by the high consumption of compressed air.
  • Another disadvantage is safety because gas can be fed into the burner even though there is no compressed air.
  • An object of the invention is therefore to provide a burner both to reduce the consumption of compressed air and to prevent gas being fed into the generator without air.
  • Another goal is to provide such a handy hot air generator.
  • An advantage of such a hot air generator is that the gas outlet being slaved to the air outlet, the safety of the hot air generator is increased, since a gas outlet is avoided in the absence of an air outlet.
  • a hot air generator 1 comprises a handle 12 , connected to an elongate nozzle 14 and of generally circular section. This hot air generator 1 is intended to generate hot air and project it out of the nozzle 14 at one of its axial ends called the outlet end.
  • the handle 12 comprises an actuating lever 122 , a gripping element 124 and a handle 126 .
  • the gripping element 124 is connected to the nozzle 14 substantially at the mid-length of the nozzle 14 and substantially perpendicular.
  • the actuating lever 122 is arranged on the gripping element 124 in the lower part, so as to perform a limited pivotal or translational movement relative to the gripping element 124 bringing it closer to it.
  • the lower part of the gripping element 124 is understood as the furthest part of the elongated nozzle 14 .
  • the actuating lever 122 is engaged, that is to say it pivots or translates, when an operator exerts a force directed towards the gripping element 124 , in order to allow the arrival of air and gas.
  • a constraint element makes it possible to return the actuating lever 122 to its starting position, that is to say before the pivoting or translation induced by the constraint exerted by the operator.
  • One end of the handle 126 is connected to an upper part of the gripping element 124 and another end of the handle 126 is connected to the lower part of the gripping element 124 .
  • the upper part of the gripping element 124 being the part closest to the nozzle 14 . Between these two ends, the handle 126 deviates from the gripping element 124 thus revealing an eye.
  • the elongate nozzle 14 has front and rear ends that are free, the front end being the exit end. It also has front 142 , central 144 and rear 146 .
  • the terms “front”, “center” and “rear” are determined according to the hot air outlet.
  • the front portion 142 is the closest portion of the hot air outlet while the rear portion 146 is the furthest portion of the hot air outlet.
  • the nozzle has a cross section that varies between at least two different area values, the largest being the one closest to the rear end of the nozzle 14 forming a venturi 4 between the rear end and the central portion 144 used to accelerate uncompressed fresh air entering through the rear end of the nozzle 14 .
  • the straight section of the elongated nozzle 14 is gradually reduced to increase thereafter.
  • the venturi reduces the consumption of compressed air compared to a furnace without hot air and using only compressed air to generate this hot air.
  • a windshield 71 may be adapted.
  • this protection can be a perforated cover that closes on the rear end by clipping, tightening or screwing.
  • a shape adapter 72 can be fitted by clipping, tightening or screwing. This adapter is used to modulate the end according to the use made of the furnace 1 .
  • two gas ducts 162 and 164 are provided. These ducts enter through the lower part of the gripping element 124 , and extend through this element 124 to end in the nozzle 14 .
  • the gas conduit 162 extends towards the front of the nozzle 14 to the level of its central portion 144 . It is connected to a gas source.
  • the gas source may be, for example, a compressed gas cylinder, a compressor.
  • the gas conduit 162 opens into a gas injector 68 .
  • This gas injector 68 is positioned substantially in the center of a section of the nozzle 14 and oriented parallel to the central mean axis thereof, towards the front.
  • the air conduit 164 extends towards the rear of the nozzle 14 , beyond the venturi 4 before forming a bend so that its tip is positioned substantially in the center of a section of the nozzle 14 and oriented parallel to the central middle axis of the latter, towards the front. It is connected to a source of compressed air, for example a compressed air cylinder. Compressed air exits the nozzle through an air injector.
  • the supply of the gas conduit 162 is controlled by the pressure prevailing in the compressed air duct 164 via a slave regulator 2 .
  • the slave regulator 2 illustrated on the figure 2a comprises an upstream servo chamber 20 .
  • the upstream servo chamber portion 20 may be made in several different ways and known to those skilled in the art. It will not be described in detail later. It comprises, inter alia, a high pressure air chamber 211 , an air expansion chamber 212 and adjustment means 213 .
  • the upstream chamber control chamber 20 delivers at its outlet compressed air at a reduced pressure with respect to the incoming air pressure. The reduced pressure of the air is variable thanks to the adjustment means 213 .
  • the slave regulator 2 further comprises a servo chamber 23 downstream of the air expansion chamber 212 , a high pressure gas chamber 221 and a gas expansion chamber 222 .
  • the control chamber 23 is separated from the gas expansion chamber 222 by a dimming element 24 which makes it possible to vary the expansion pressure of the gas in the gas expansion chamber 222 as a function of the expansion pressure of the air in the the servo chamber 23 .
  • This dimming element 24 may be a disk which moves by translation in response to a pressure difference between the expansion pressures of the air and the gas.
  • the disc has on its edges an O-ring for sealing between the servo chamber 23 and the gas expansion chamber 222 .
  • a membrane whose edges are fixed to the wall of the servo-control chamber 23 and the gas expansion chamber 222 in a sealed manner, can also be used. This membrane is deformed as a function of the pressure difference between the expansion pressures of the air and the gas.
  • the gas expansion chamber 222 is separated from the high pressure gas chamber 221 by a partition wall 26 .
  • the partition wall 26 comprises an orifice 26 ' .
  • An H-shaped valve 25 is positioned between the gas expansion chamber 222 and the high pressure gas chamber 221 through the orifice 26 ' .
  • a first shaft of the H-shaped valve 25 is positioned just below the dimmer element 24 .
  • the first shaft of the valve 25 is directly connected to the dimmer element 24 .
  • the dimming element 24 constitutes the first shaft of the valve 25 .
  • a constraining element 271 acts on the other stem of the H-shaped valve 25 to oppose a displacement or a deformation of the dimming element of the servo chamber 23 towards the gas expansion chamber 222 .
  • the constraint member 271 may be a spring attached to a wall of the high pressure gas chamber 221 opposite the partition wall 26 opposite the orifice 26 ' .
  • the size of the orifice 26 ' is smaller than the size of the shafts of the valve 25 .
  • the shafts of the valve 25 may have different dimensions.
  • the high pressure air chamber 221 is provided with a gas inlet and the gas expansion chamber 26 is provided with a gas outlet.
  • the dimming element 24 moves or is deformed in a servo chamber direction 23 towards gas expansion chamber 222 .
  • the dimming element 24 then exerts a stress on the valve 25 which acts on the constraining element 271 by opposing the restoring force of the constraining element 271 .
  • the valve 25 then moves out of the partition wall 26 .
  • the position of the dimming element 24 depends on the pressures P da , P dg on either side of the dimming element 24 .
  • the position of the valve 25 depends on the pressures P da , P dg on either side of the dimming element 24 .
  • This first embodiment of the slave valve provides a gas pressure in the gas conduit 162 substantially equal to the pressure of compressed air in the air duct 164 ( P dg ⁇ P da ).
  • a second constraint element 272 acts on the dimming element 24 to create a constant positive offset ⁇ P with respect to the pressure P da prevailing in the servo chamber 23
  • the second constraint element 272 is a spring
  • it is positioned in the servo chamber 23 so as to bear on the dimming element 24 and a wall of the servo chamber opposite to the Variable element 24 .
  • the spring exerts a stress on the dimming element 24 so as to force it towards the gas expansion chamber 222 .
  • the rest of the slave regulator 1 is identical to the first embodiment of the slave regulator 1 .
  • the second constraint element 272 always acts on the dimming element 24 so as to create a positive offset ⁇ P with respect to the pressure P da prevailing in the servo chamber 23 .
  • this positive offset ⁇ P is adjustable thanks to adjustment means 274 .
  • the second constraint element 272 is a spring
  • the spring rests on the dimming element 24 , at one of its ends.
  • the spring is supported on a plate 274 provided with a rod at its center and extending on the side opposite the spring.
  • the rod can move in a back and forth movement parallel to the spring by sliding or screwing.
  • the adjustment means of the plate 274 At the wall of the control chamber 25 opposite to the dimming element 24 is provided the adjustment means of the plate 274 for adjusting the height z of this plate via its rod. The more the plate 274 is close to the dimming element 24 and the larger the offset. The further the plate 274 is from the dimmer element 24 , the smaller the offset.
  • the spring exerts a stress on the dimming element 24 so as to force it towards the gas expansion chamber 222 .
  • the offset is then dependent on the height z of the plate.
  • a negative offset can be created. This embodiment is illustrated on the figure 2d .
  • the general design of this embodiment is identical to the first embodiment, except that an addition of a second constraint element 272 acting on the dimming element 24 makes it possible to obtain the negative offset - ⁇ P by relative to the pressure P da prevailing in the servo chamber 23 .
  • the second stress element 272 is a spring, it rests at one of its ends on the first shaft of the valve 25 and, at the other of its ends, on the separation wall. 26 on the side of the gas expansion chamber 222 .
  • the second spring exerts a constraint on the dimming element 24 so as to force it towards the servo chamber 23 .
  • the pressure in the gas expansion chamber P dg is substantially P da - ⁇ P .
  • the gas supply is slaved to the supply of compressed air, which increases the safety of the hot air generator 1 , since a supply of gas without air supply is avoided.
  • the valve 25 may be designed differently from the description above and may have a different shape so as to open or close the orifice 26 ' of the partition wall 26 according to the movements or deformations of the dimmer element 24 .
  • the slave regulator 2 can be used for applications other than a hot air generator. It can be used in all applications requiring servo control of one fluid on the other.
  • Ignition means 128 for example a piezoelectric igniter, are positioned in the gripping element 124 in contact with the actuating lever 122 .
  • a piezoelectric igniter 128 is known, for example in the document EP 1 795 803 and will not be described in more detail later.
  • An electrically conductive wire 8 in contact with the piezoelectric igniter, extends to the flame generation means 6 .
  • the flame generation means 6 inside the nozzle 14 , comprise a shrink tube 62 , a burner 64 and a gas injector 68 also forming a support post for the burner 64 .
  • the shrink tube 62 having front and rear ends, has a straight cylinder shape with a generally circular base.
  • the cross section of the narrowed tube 62 is smaller than the cross section of the the nozzle 14 .
  • the cross-section of the narrowed tube 62 at the front end is tightened slightly.
  • This constriction 621 of the shrink tube 62 can contain the flame generated inside thereof, or in the vicinity of this constriction 621 .
  • the distance between the constriction 621 and the outlet end of the nozzle 14 is between 2 and 8 times the diameter of the nozzle 14 .
  • the tube 62 is not narrowed, that is to say it does not include tightening 621 at its front end.
  • the flame is not contained inside the shrink tube 62 and extends further towards the outlet end of the nozzle 14 .
  • the shrink tube 62 has the same axis of revolution as the nozzle 14 .
  • the burner 64 is held by the gas injector 68 relatively in the axis of the nozzle 14 . It has a cylindrical rear portion 641 and a cone-shaped front portion 642 diverging towards the front portion.
  • the rear portion 641 is connected to the injector 68 by fitting into a bore 682 provided therein, and extends to the vicinity of the necking tube 62 .
  • the gas is ejected from the injected gas 68 through through-holes 683 placing in fluid communication the space around the rear portion 641 of the burner 64 and the gas conduit 162 .
  • These orifices 683 are positioned in such a way that the gas is ejected tangentially at the cylindrical rear portion 841 of the burner 64.
  • the center of the burner 64 is traversed by a longitudinal bore 643 passing the electrically conductive wire 8 in contact with the piezoelectric igniter 128.
  • the gas passes, meanwhile, around the burner 64 towards the inside of the shrunk tube 62 .
  • the shape of the burner 64 makes it possible to mix the air and the gas. Indeed, at the outlet of the gas injector 68 , the gas moves tangentially to the rear portion 641 of the burner 64 and tends to cling to the wall thereof by drawing by suction of the air present in the surrounding parts. This mixture of air and gas is also accelerated by the narrowing 621 of the straight section towards the front of the nozzle 14.
  • a central recess serving as a gas well 66.
  • the gas well 66 receives at its bottom the electrically conductive wire 8 in contact with the piezoelectric igniter 128.
  • wire 8 is electrically isolated from the gas well 66.
  • the potential difference between the walls of the well 66 and the wire 8 created by the piezoelectric igniter 128 causes a spark that ignites the gas / air mixture contained in the well and in the the necking tube 62.
  • the generated flame then clings to the front surface of the burner and to the well.
  • the mixture of air and gas in the gas well 66 is renewed due to the turbulent flow of the mixture.
  • the shrink tube 62 serves as a separation to obtain a mixture of gas and air proportions within the shrink tube 62 and the gas well 66.
  • a section S 1 delimited between the elongate nozzle 14 and the shrink tube 62 and a section S 2 delimited between the shrink tube 62 and the burner 64 make it possible to play on the mixture and the temperature inside the nozzle 14 .
  • the burner 64 is a stabilized flame burner resistant to the flow of air, that is to say that the flame remains hanging in the same place, for example a burner stabilized stabilizer or Coanda burner such as described in the patent application filed under the European Deposit Number 08290820.3 or PCT 07/06419 .
  • the presence of the necking tube 62 has several advantages. It allows, among other things, to avoid overheating of the elongated nozzle 14, and to separate the air flow in two in order to guarantee clean combustion (that is to say with a good proportion of gas and air for total gas combustion). Indeed, the fact that a portion of the air flow is not heated to cool the elongated nozzle 14. This also ensures a supply of fresh air for better combustion and to contain the flame inside the shrunken tube 62 and in the vicinity of shrink tube 62 . This fresh air is heated in the vicinity of the constriction 621 of the narrowed tube 62 and is projected out of the outlet end of the nozzle 14 .
  • the hot air generator 1 is operated by the operator when the latter, holding the handle 12, exerts pressure on the actuating lever 122. This pressure forces the actuating lever 122 to pivot around the lower part of the gripping element 124 or to move in translation towards the gripping element 124.
  • the displacement of the actuating lever 122 causes the opening of valves in the gas ducts 162 and air 164 thus allowing the compressed air and the gas to pass.
  • the compressed air then passes into the air duct 164 before being injected by the air injector upstream of the venturi 4.
  • the injection of compressed air through the venturi 4 causes a suction of ambient air which enters through the rear end of the furnace 1 .
  • the ambient air then mixes with the compressed air at the venturi 4 and before a first fraction passes through the flame generation means 6.
  • the other fraction then passes through the passage defined between the tube shrinks 62 and the elongated nozzle 14 .
  • the gas passes into the gas conduit 162 before being injected by the gas injector 68 around the burner 64.
  • the gas enters the shrink tube 62 with the first fraction of the ambient air / compressed air mixture.
  • the well 66 fills with gas and the mixture of ambient air / compressed air.
  • the movement of the actuating lever 122 causes a constraint on the piezoelectric igniter 128 as described in the document EP 1 795 803 which causes the creation of a spark in the well 66 by the wire 8 electrically isolated from the gas well 66, igniting the gas / ambient air / compressed air mixture.
  • a flame then occurs in the narrowed tube 62 and propagates to the vicinity of its constriction 621.
  • the flame then heats the other fraction of the ambient air / compressed air mixture which has passed through the passage defined between the narrowed tube 62 and the elongate nozzle 14.
  • the ambient air / heated compressed air mixture then passes through the front portion 142 of the elongated nozzle 14 to the outlet end of the nozzle 14. This mixture of ambient air / compressed air can then be used to heat the material. .
  • the air temperature exiting the furnace is between 300 ° C and 1000 ° C.
  • the design of the hot air generator 1 as provided by the invention facilitates the control of the tightness of the gas circuit.
  • the gas injector 68 comprises an inner toric space 681 in fluid communication with the gas conduit 162. It also has a bore 682 to accommodate the burner 64.
  • the diameter of the bore 682 is smaller than the internal diameter of the O-space 681.
  • the bore 682 and the O-space 681 have the same axis of revolution as the nozzle 14 and the narrowed tube 62.
  • the gas injector 68 On a front surface, facing the front of the nozzle 14, the gas injector 68, is provided one or more orifices 683 passing between the outside and the inner toric space 681 of the injector 68.
  • C ' is by this / these orifice (s) 683 that the gas leaves.
  • the gas injector comprises several orifices 683.
  • the orifices 683 are four in number that can be evenly spaced or not, around the bore 682.
  • Pin 91 is an elongated element of revolution formed of at least two cylinders 911, 912 of different sections. These two cylinders 911, 912 can be reported one on the other or made in one piece. At the interface between the two cylinders 911, 912 of different sections, a bearing surface 91s is present on the cylinder 911 of larger section.
  • the burner 64 is removed from the gas injector 68.
  • the pin 91 is inserted in place of the burner 64 by its smaller section 912.
  • a friction piece 92 and an O-ring 93 are placed between the surface of the burner 64 91s and the front surface of the gas injector 68 so that the friction piece 92 is in contact with the bearing surface 91s on one side and O-ring 93 on the other.
  • the O-ring 93 is in contact with the front surface of the gas injector 68 so that it closes, in a sealed manner, or the orifices 683 present on this front surface 68s when the pin 91 is forced towards the gas injector 68.
  • the friction piece 92 prevents the O-ring 93 from rotating while it is in contact with the front surface 68s of the gas injector 68 while allowing the operator to turn the pin 91 during its operation. insertion into the gas injector 68. Indeed, since the front surface of the gas injector 68 has orifices 683 that the O-ring 93 covers, it can be deteriorated by friction if it turns while being forced. to the front surface 68s of the gas injector 98.
  • the tightness check is then performed on the gas injector 68 while it is in its final configuration. Gas is injected into the gas system to check for leaks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Gas Burners (AREA)
  • Air Bags (AREA)
  • Lighters Containing Fuel (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Description

L'invention concerne un générateur d'air chaud.The invention relates to a hot air generator.

Un générateur d'air chaud se présente généralement sous la forme d'un corps allongé traversé longitudinalement par un conduit dans lequel circule du gaz à enflammer. Le corps est prolongé d'une partie brûleur généralement creuse dans laquelle débouche le conduit. La partie brûleur est munie à son extrémité libre de moyens de combustion de gaz capables d'enflammer le gaz. Un tel brûleur est, par exemple, décrit dans le document EP 1 795 803 .A hot air generator is generally in the form of an elongate body longitudinally traversed by a conduit in which gas to ignite. The body is extended by a generally hollow burner part into which the conduit opens. The burner portion is provided at its free end with gas combustion means capable of igniting the gas. Such a burner is, for example, described in the document EP 1 795 803 .

De manière plus générale, il peut être utilisé pour la chauffe de matériaux thermodurcissables, thermoformables, thermorétractables, matériaux que l'on fait adhérer par la chaleur et analogues.More generally, it can be used for heating thermosetting, thermoformable, heat-shrinkable materials, heat-bonded materials and the like.

Par exemple, un tel générateur d'air chaud est avantageusement utilisé pour la pose ou le marquage de bitume.For example, such a hot air generator is advantageously used for laying or marking bitumen.

Il peut également être utilisé dans le domaine du bâtiment par les couvreurs pour recouvrir les toits de matériau imperméable thermodurcissable, lequel se trouve généralement sous la forme de bandes enroulées.It can also be used in the construction field by roofers to cover roofs with thermosetting waterproof material, which is usually in the form of rolled strips.

Le générateur peut encore être utilisé dans le domaine de la logistique et du transport pour rétracter les films plastiques entourant les palettes de marchandises.The generator can still be used in the field of logistics and transport to retract the plastic films surrounding the pallets of goods.

Le générateur peut aussi être utilisé pour le chauffage de locaux.The generator can also be used for space heating.

Bien que le générateur décrit dans le document EP 1 795 803 soit d'efficacité satisfaisante, les changements de législations concernant l'utilisation de tels générateurs à main préconisent l'utilisation de générateurs d'air chaud à flamme non apparente.Although the generator described in the document EP 1 795 803 either of satisfactory efficiency, the changes of legislation concerning the use of such hand generators recommend the use of furnaces of hot air with apparent flame.

Une solution pour se conformer à la nouvelle législation est de projeter de l'air comprimé à chauffer vers la flamme alors que celle-ci est générée à l'intérieur d'un générateur d'air chaud de manière à ce qu'elle n'en sorte pas, afin de transférer les calories à l'air comprimé qui sort du générateur à l'état chaud. Ainsi, la matière à chauffer n'est pas en contact avec une flamme mais avec de l'air chaud.One solution to comply with the new legislation is to project compressed air to heat the flame while it is generated inside a furnace so that that it does not come out, in order to transfer the calories to the compressed air coming out of the generator in the hot state. Thus, the material to be heated is not in contact with a flame but with hot air.

Cette solution a l'inconvénient de générer un haut coût d'utilisation par la consommation importante d'air comprimé.This solution has the disadvantage of generating a high cost of use by the high consumption of compressed air.

Un autre inconvénient réside dans la sécurité parce que du gaz peut être acheminé dans le brûleur alors même qu'il n'y ait plus d'air comprimé.Another disadvantage is safety because gas can be fed into the burner even though there is no compressed air.

On connait par ailleurs les documents EP 0 841 518 , US 4 798 530 , et US 5 649 824 qui décrivent un générateur d'air chaud. Cependant, aucune des solutions proposées par ces trois documents n'est satisfaisante.We also know the documents EP 0 841 518 , US 4,798,530 , and US 5,649,824 which describe a hot air generator. However, none of the solutions proposed by these three documents is satisfactory.

Un but de l'invention est donc de proposer un brûleur permettant à la fois de réduire la consommation d'air comprimé et d'empêcher que du gaz soit amené dans le générateur sans air.An object of the invention is therefore to provide a burner both to reduce the consumption of compressed air and to prevent gas being fed into the generator without air.

Un autre but est de proposer un tel générateur d'air chaud maniable.Another goal is to provide such a handy hot air generator.

Dans cet objectif, l'invention propose un générateur d'air chaud portable comprenant :

  • une poignée comprenant des moyens d'allumage ;
  • une tuyère allongée liée à la poignée comprenant une extrémité de sortie pour l'éjection de l'air chaud ;
  • des moyens de génération de flamme à l'intérieur de la tuyère allongée ;
  • un venturi, en amont des moyens de génération de flamme, formé sur la tuyère allongée ;
caractérisé en ce que le générateur comprend en plus :
  • un conduit gaz traversant la poignée et destiné à amener un gaz combustible dans la tuyère allongée et au niveau des moyens de génération de flamme ;
  • un conduit air traversant la poignée et destiné à amener de l'air comprimé dans la tuyère allongée et en amont du venturi ;
  • un détendeur asservi contrôlant une pression de gaz dans le conduit gaz en fonction d'une pression d'air dans le conduit air.
For this purpose, the invention proposes a portable hot air generator comprising:
  • a handle comprising ignition means;
  • an elongated nozzle attached to the handle including an outlet end for ejecting hot air;
  • flame generating means within the elongated nozzle;
  • a venturi upstream of the flame generating means formed on the elongated nozzle;
characterized in that the generator further comprises:
  • a gas conduit passing through the handle and intended to bring a fuel gas into the elongated nozzle and at the level of the flame generation means;
  • an air duct passing through the handle and intended to bring compressed air into the elongated nozzle and upstream of the venturi;
  • a slave regulator controlling a gas pressure in the gas duct according to an air pressure in the air duct.

Un avantage d'un tel générateur d'air chaud est que la sortie de gaz étant asservie à la sortie d'air, la sécurité du générateur d'air chaud est augmentée, puisqu'une sortie de gaz est évitée en l'absence d'une sortie d'air.An advantage of such a hot air generator is that the gas outlet being slaved to the air outlet, the safety of the hot air generator is increased, since a gas outlet is avoided in the absence of an air outlet.

D'autres caractéristiques optionnelles et non limitatives sont :

  • les moyens de génération de flamme comprennent un tube placé dans la tuyère, un brûleur et un injecteur de gaz, le tube est disposé au moins partiellement autour du brûleur et destiné à couper un flux d'air frais en deux ;
  • le tube est un tube rétreint, la section du tube rétreint étant resserrée au niveau de sa partie la plus proche de l'extrémité de sortie de la tuyère ;
  • l'injecteur de gaz comprend un alésage, ayant le même axe que la tuyère, pour l'insertion du brûleur, et au moins un orifice par le(s)quel(s) sort le gaz, cet/ces orifice(s) étant disposé de manière à ce que le gaz sort tangentiellement au brûleur ;
  • le brûleur est un brûleur à flamme stabilisée, c'est-à-dire que a flamme générée reste accrochée au même endroit ;
  • le brûleur à flamme stabilisée est soit un brûleur stabilisé par effet de sillage ou un brûleur Coanda ;
  • les moyens d'allumage sont un allumeur piézo-électrique couplé à un fil électriquement conducteur à son contact et qui s'étend jusqu'aux moyens de génération de flamme ;
  • le détendeur asservi comprend une chambre d'asservissement en communication de fluide avec le conduit air et en aval d'une chambre de détente air, une chambre gaz haute pression, et une chambre de détente gaz en communication de fluide avec le conduit gaz, caractérisé en ce que la chambre d'asservissement est séparée de la chambre de détente gaz par un élément variateur se déplaçant ou se déformant en réponse à une différence de pression entre une pression régnant dans la chambre d'asservissement et une pression régnant dans la chambre de détente gaz, un premier élément de contrainte s'opposant au déplacement ou à la déformation de l'élément variateur quand celui-ci se déplace ou se déforme vers la chambre de détente gaz ;
  • l'élément variateur est un disque se déplaçant par translation en réponse à la différence de pression entre la pression régnant dans la chambre d'asservissement et la pression régnant dans la chambre de détente gaz, le disque présentant sur ses bords un joint torique permettant d'assurer l'étanchéité entre la chambre d'asservissement et la chambre de détente gaz ;
  • l'élément variateur est une membrane se déformant en réponse à la différence de pression entre la pression régnant dans la chambre d'asservissement et la pression régnant dans la chambre de détente gaz, la membrane ayant des bords fixés de manière étanche sur une paroi des chambres d'asservissement et de détente gaz ;
  • le détendeur asservi comprend en outre un deuxième élément de contrainte adapté pour créer un offset de pression entre la pression régnant dans la chambre d'asservissement et la pression régnant dans la chambre de détente gaz ;
  • le deuxième élément de contrainte est un deuxième ressort prévu dans la chambre d'asservissement et destiné à créer un offset de manière à ce que la pression de gaz dans le conduit gaz soit toujours supérieure d'une quantité sensiblement constante à la pression d'air dans le conduit air ;
  • le deuxième ressort possède un point d'appui de hauteur fixe dans la chambre d'asservissement et est destiné à créer un offset sensiblement constant ;
  • le deuxième ressort possède un point d'appui de hauteur variable dans la chambre d'asservissement et est destiné à créer un offset variable ;
  • le deuxième élément de contrainte est un deuxième ressort prévu dans la chambre de détente gaz et destiné à créer un offset de manière à ce que la pression de gaz dans le conduit gaz soit toujours inférieure d'une quantité sensiblement constante à la pression d'air dans le conduit air ; et
  • l'injecteur de gaz comprend en outre un espace torique intérieur en communication de fluide avec le conduit gaz dont le diamètre interne est supérieur au diamètre de l'alésage, un ou plusieurs orifices traversant, mettant en communication de fluide l'espace torique et l'intérieur de la tuyère, sur une surface tournée vers l'extrémité de sortie de la tuyère, l'alésage, l'espace torique et la tuyère ayant sensiblement le même axe.
Other optional and non-limiting features are:
  • the flame generation means comprise a tube placed in the nozzle, a burner and a gas injector, the tube is arranged at least partially around the burner and intended to cut a flow of fresh air in two;
  • the tube is a narrowed tube, the section of the narrowed tube being constricted at its part closest to the outlet end of the nozzle;
  • the gas injector comprises a bore, having the same axis as the nozzle, for the insertion of the burner, and at least one orifice by which the gas is discharged, this orifice (s) being arranged so that the gas flows tangentially to the burner;
  • the burner is a stabilized flame burner, that is to say that flame generated remains hooked in the same place;
  • the stabilized flame burner is either a wake stabilized burner or a Coanda burner;
  • the ignition means are a piezoelectric igniter coupled to an electrically conductive wire in contact therewith and extending to the flame generating means;
  • the slave regulator comprises a servo chamber in fluid communication with the air duct and downstream of an air expansion chamber, a high pressure gas chamber, and a gas expansion chamber in fluid communication with the gas conduit, characterized in that the servo chamber is separated from the gas expansion chamber by a dimmer element moving or deforming in response to a pressure difference between a pressure in the servo chamber and a pressure in the gas expansion chamber, a first constraining member opposing the displacement or deformation of the dimming element when it moves or deforms towards the gas expansion chamber;
  • the dimming element is a disk moving in translation in response to the pressure difference between the pressure in the servo chamber and the pressure in the gas expansion chamber, the disk having on its edges an O-ring allowing ensure sealing between the servo chamber and the gas expansion chamber;
  • the dimming element is a membrane which deforms in response to the pressure difference between the pressure in the control chamber and the pressure in the gas expansion chamber, the membrane having edges sealingly attached to a wall of the servo rooms and gas relaxation;
  • the slave regulator further comprises a second constraint element adapted to create a pressure offset between the pressure in the servo chamber and the pressure in the expansion chamber gas;
  • the second constraint element is a second spring provided in the servo chamber and intended to create an offset so that the gas pressure in the gas conduit is always higher by a substantially constant amount at the air pressure in the air duct;
  • the second spring has a fulcrum of fixed height in the servo chamber and is intended to create a substantially constant offset;
  • the second spring has a fulcrum of variable height in the servo chamber and is intended to create a variable offset;
  • the second constraint element is a second spring provided in the gas expansion chamber and intended to create an offset so that the gas pressure in the gas conduit is always less than a substantially constant amount at the air pressure in the air duct; and
  • the gas injector further comprises an inner toric space in fluid communication with the gas duct whose internal diameter is greater than the diameter of the bore, one or more orifices passing through, placing in fluid communication the toric space and the the interior of the nozzle, on a surface facing the outlet end of the nozzle, the bore, the toric space and the nozzle having substantially the same axis.

D'autres caractéristiques, buts et avantages apparaîtront à la lecture de la description qui suit et en référence aux dessins donnés à titre illustratif et non limitatif, parmi lesquels :

  • la figure 1a est une vue schématique en coupe longitudinale d'un générateur d'air chaud selon l'invention ;
  • la figure 1b est une vue schématique en coupe longitudinale du générateur d'air chaud selon le plan de coupe I-I de la figure 1 a.
  • les figures 2a, 2b, 2c et 2d sont des vues schématiques de moyens de régulation d'un ratio débit gaz/débit air utilisé dans le générateur d'air chaud selon un premier, deuxième, troisième et quatrième modes de réalisation ; et
  • la figure 3 est une vue schématique en coupe longitudinale d'un injecteur de gaz utilisé dans le générateur d'air chaud selon l'invention, illustrant un contrôle d'étanchéité du circuit de gaz.
Other characteristics, aims and advantages will become apparent on reading the description which follows and with reference to the drawings given by way of non-limiting illustration, among which:
  • the figure 1a is a schematic view in longitudinal section of a hot air generator according to the invention;
  • the figure 1b is a schematic view in longitudinal section of the hot air generator according to the sectional plane II of the figure 1 at.
  • the Figures 2a, 2b , 2c and 2d are schematic views of means for regulating a gas flow / air flow rate ratio used in the hot air generator according to a first, second, third and fourth embodiment; and
  • the figure 3 is a schematic longitudinal sectional view of a gas injector used in the hot air generator according to the invention, illustrating a leak test of the gas circuit.

Générateur d'air chaudHot air generator

En référence aux figures 1a et 1b, un générateur d'air chaud 1 selon l'invention comprend une poignée 12, liée à une tuyère allongée 14 et de section généralement circulaire. Ce générateur d'air chaud 1 est destiné à générer de l'air chaud et à le projeter hors de la tuyère 14 à l'une de ses extrémités axiales appelée extrémité de sortie.With reference to Figures 1a and 1b , a hot air generator 1 according to the invention comprises a handle 12 , connected to an elongate nozzle 14 and of generally circular section. This hot air generator 1 is intended to generate hot air and project it out of the nozzle 14 at one of its axial ends called the outlet end.

PoignéeHandle

La poignée 12 comprend un levier d'actionnement 122, un élément de préhension 124 et une anse 126. L'élément de préhension 124 est raccordé à la tuyère 14 sensiblement au niveau de la mi-longueur de la tuyère 14 et de manière sensiblement perpendiculaire.The handle 12 comprises an actuating lever 122 , a gripping element 124 and a handle 126 . The gripping element 124 is connected to the nozzle 14 substantially at the mid-length of the nozzle 14 and substantially perpendicular.

Le levier d'actionnement 122 est agencé sur l'élément de préhension 124 en partie basse, de manière à pouvoir effectuer un mouvement de pivotement ou de translation limité par rapport à l'élément de préhension 124 le rapprochant de celui-ci. La partie basse de l'élément de préhension 124 est comprise comme la partie la plus éloignée de la tuyère allongée 14. Le levier d'actionnement 122 est enclenché, c'est-à-dire qu'il pivote ou translate, quand un opérateur y exerce une force dirigée vers l'élément de préhension 124, afin de permettre l'arrivée d'air et de gaz.The actuating lever 122 is arranged on the gripping element 124 in the lower part, so as to perform a limited pivotal or translational movement relative to the gripping element 124 bringing it closer to it. The lower part of the gripping element 124 is understood as the furthest part of the elongated nozzle 14 . The actuating lever 122 is engaged, that is to say it pivots or translates, when an operator exerts a force directed towards the gripping element 124 , in order to allow the arrival of air and gas.

Un élément de contrainte permet de ramener le levier d'actionnement 122 à sa position de départ, c'est-à-dire avant le pivotement ou la translation induit(e) par la contrainte exercée par l'opérateur.A constraint element makes it possible to return the actuating lever 122 to its starting position, that is to say before the pivoting or translation induced by the constraint exerted by the operator.

Une extrémité de l'anse 126 est reliée à une partie haute de l'élément de préhension 124 et une autre extrémité de l'anse 126 est reliée à la partie basse de l'élément de préhension 124. La partie haute de l'élément de préhension 124 étant la partie située la plus proche de la tuyère 14. Entre ces deux extrémités, l'anse 126 s'écarte de l'élément de préhension 124 laissant apparaître ainsi un oeil.One end of the handle 126 is connected to an upper part of the gripping element 124 and another end of the handle 126 is connected to the lower part of the gripping element 124 . The upper part of the gripping element 124 being the part closest to the nozzle 14 . Between these two ends, the handle 126 deviates from the gripping element 124 thus revealing an eye.

Tuyère allongéeElongated nozzle

La tuyère allongée 14 possède des extrémités avant et arrière qui sont libres, l'extrémité avant étant l'extrémité de sortie. Elle possède également des parties avant 142, centrale 144 et arrière 146. Les termes « avant », « centrale » et « arrière » sont déterminés en fonction de la sortie d'air chaud. La partie avant 142 est la partie la plus proche de la sortie d'air chaud alors que la partie arrière 146 est la partie la plus éloignée de la sortie d'air chaud.The elongate nozzle 14 has front and rear ends that are free, the front end being the exit end. It also has front 142 , central 144 and rear 146 . The terms "front", "center" and "rear" are determined according to the hot air outlet. The front portion 142 is the closest portion of the hot air outlet while the rear portion 146 is the furthest portion of the hot air outlet.

Au niveau de la partie arrière 146, la tuyère présente une section droite qui varie entre au moins deux valeurs d'aire différentes, la plus grande étant celle située la plus proche de l'extrémité arrière de la tuyère 14 formant un venturi 4 entre l'extrémité arrière et la partie centrale 144 utilisé pour accélérer l'air frais non comprimé entrant par l'extrémité arrière de la tuyère 14.At the rear portion 146 , the nozzle has a cross section that varies between at least two different area values, the largest being the one closest to the rear end of the nozzle 14 forming a venturi 4 between the rear end and the central portion 144 used to accelerate uncompressed fresh air entering through the rear end of the nozzle 14 .

Par exemple, La section droite de la tuyère allongée 14 se réduit progressivement pour augmenter ensuite.For example, the straight section of the elongated nozzle 14 is gradually reduced to increase thereafter.

Le venturi permet de diminuer la consommation d'air comprimé par rapport à un générateur d'air chaud n'en disposant pas et n'utilisant que de l'air comprimé pour générer cet air chaud.The venturi reduces the consumption of compressed air compared to a furnace without hot air and using only compressed air to generate this hot air.

Sur l'extrémité arrière de la tuyère allongée 14, peut s'adapter une protection contre le vent 71. Par exemple, cette protection peut être un cache perforé venant se refermer sur l'extrémité arrière par clipsage, serrage ou vissage.On the rear end of the elongated nozzle 14 , a windshield 71 may be adapted. For example, this protection can be a perforated cover that closes on the rear end by clipping, tightening or screwing.

Sur l'extrémité avant de la tuyère allongée 14, peut s'adapter un adaptateur de forme 72 par clipsage, serrage ou vissage. Cet adaptateur permet de moduler l'extrémité selon l'usage qui en est fait du générateur d'air chaud 1.On the front end of the elongate nozzle 14 , a shape adapter 72 can be fitted by clipping, tightening or screwing. This adapter is used to modulate the end according to the use made of the furnace 1 .

Au niveau de la partie centrale 144, sont agencés à l'intérieur de la tuyère 14 des moyens de génération de flamme 6 qui seront détaillés plus en avant par la suite.At the central portion 144 are arranged inside the nozzle 14 of the flame generation means 6 which will be detailed further later.

Alimentation en gaz et enGas supply and airair

Afin d'amener du gaz pour alimenter la flamme et de l'air pour générer l'air chaud et permettre la combustion du gaz, deux conduits gaz 162 et air 164 sont prévus. Ces conduits entrent par la partie basse de l'élément de préhension 124, et s'étendent à travers cet élément 124 pour aboutir dans la tuyère 14.In order to supply gas to supply the flame and air to generate the hot air and to allow the combustion of the gas, two gas ducts 162 and 164 are provided. These ducts enter through the lower part of the gripping element 124 , and extend through this element 124 to end in the nozzle 14 .

Le conduit gaz 162 s'étend vers l'avant de la tuyère 14 jusqu'au niveau de sa partie centrale 144. Il est relié à une source de gaz. La source de gaz peut être, par exemple, une bombonne de gaz comprimé, un compresseur. Le conduit gaz 162 débouche dans un injecteur de gaz 68. Cet injecteur de gaz 68 est positionné sensiblement au centre d'une section de la tuyère 14 et orienté parallèlement à l'axe moyen central de celle-ci, vers l'avant.The gas conduit 162 extends towards the front of the nozzle 14 to the level of its central portion 144 . It is connected to a gas source. The gas source may be, for example, a compressed gas cylinder, a compressor. The gas conduit 162 opens into a gas injector 68 . This gas injector 68 is positioned substantially in the center of a section of the nozzle 14 and oriented parallel to the central mean axis thereof, towards the front.

Le conduit air 164 s'étend vers l'arrière de la tuyère 14, au-delà du venturi 4 avant de former un coude afin que son embout soit positionné sensiblement au centre d'une section de la tuyère 14 et orienté parallèlement à l'axe moyen central de celle-ci, vers l'avant. Il est relié à une source d'air comprimé, par exemple une bombonne d'air comprimé. L'air comprimé sort de l'embout à travers un injecteur d'air.The air conduit 164 extends towards the rear of the nozzle 14 , beyond the venturi 4 before forming a bend so that its tip is positioned substantially in the center of a section of the nozzle 14 and oriented parallel to the central middle axis of the latter, towards the front. It is connected to a source of compressed air, for example a compressed air cylinder. Compressed air exits the nozzle through an air injector.

Détendeur asserviRestricted regulator

L'alimentation du conduit gaz 162 est asservie par la pression régnant dans le conduit d'air 164 comprimé via un détendeur asservi 2.The supply of the gas conduit 162 is controlled by the pressure prevailing in the compressed air duct 164 via a slave regulator 2 .

En référence aux figures 2a, 2b, 2c et 2d sont décrits ci-après plusieurs modes de réalisation du détendeur asservi 2.With reference to Figures 2a, 2b , 2c and 2d are described below several embodiments of the slave regulator 2 .

Le détendeur asservi 2 illustré sur la figure 2a comprend une partie amont chambre d'asservissement 20. La partie amont chambre d'asservissement 20 peut être réalisée de plusieurs manières différentes et connues de l'homme du métier. Elle ne sera donc pas décrite en détail par la suite. Elle comprend, entre autre, une chambre air haute pression 211, une chambre de détente air 212 et des moyens de réglage 213. La chambre amont chambre d'asservissement 20 délivre à sa sortie de l'air comprimé à une pression réduite par rapport à la pression d'air entrant. La pression réduite de l'air est variable grâce aux moyens de réglage 213.The slave regulator 2 illustrated on the figure 2a comprises an upstream servo chamber 20 . The upstream servo chamber portion 20 may be made in several different ways and known to those skilled in the art. It will not be described in detail later. It comprises, inter alia, a high pressure air chamber 211 , an air expansion chamber 212 and adjustment means 213 . The upstream chamber control chamber 20 delivers at its outlet compressed air at a reduced pressure with respect to the incoming air pressure. The reduced pressure of the air is variable thanks to the adjustment means 213 .

Le détendeur asservi 2 comprend en plus une chambre d'asservissement 23 en aval de la chambre de détente air 212, une chambre gaz haute pression 221 et une chambre de détente gaz 222.The slave regulator 2 further comprises a servo chamber 23 downstream of the air expansion chamber 212 , a high pressure gas chamber 221 and a gas expansion chamber 222 .

La chambre d'asservissement 23 est séparée de la chambre de détente gaz 222 par un élément variateur 24 qui permet de faire varier la pression de détente du gaz dans la chambre de détente gaz 222 en fonction de la pression de détente de l'air dans la chambre d'asservissement 23.The control chamber 23 is separated from the gas expansion chamber 222 by a dimming element 24 which makes it possible to vary the expansion pressure of the gas in the gas expansion chamber 222 as a function of the expansion pressure of the air in the the servo chamber 23 .

Cet élément variateur 24 peut être un disque qui se déplace par translation en réponse à une différence de pression entre les pressions de détente de l'air et du gaz. Le disque présente sur ses bords un joint torique permettant d'assurer l'étanchéité entre la chambre d'asservissement 23 et la chambre de détente gaz 222.This dimming element 24 may be a disk which moves by translation in response to a pressure difference between the expansion pressures of the air and the gas. The disc has on its edges an O-ring for sealing between the servo chamber 23 and the gas expansion chamber 222 .

Une membrane dont les bords sont fixés à la paroi des chambres d'asservissement 23 et de détente gaz 222 de manière étanche, peut également être utilisée. Cette membrane se déforme en fonction de la différence de pression entre les pressions de détente de l'air et du gaz.A membrane whose edges are fixed to the wall of the servo-control chamber 23 and the gas expansion chamber 222 in a sealed manner, can also be used. This membrane is deformed as a function of the pressure difference between the expansion pressures of the air and the gas.

La chambre de détente gaz 222 est séparée de la chambre gaz haute pression 221 par une paroi de séparation 26.The gas expansion chamber 222 is separated from the high pressure gas chamber 221 by a partition wall 26 .

La paroi de séparation 26 comprend un orifice 26'. Un clapet 25 en forme de H est positionné entre la chambre de détente gaz 222 et la chambre gaz haute pression 221 à travers l'orifice 26'. Une première hampe du clapet 25 en forme de H est positionnée juste sous l'élément variateur 24.The partition wall 26 comprises an orifice 26 ' . An H-shaped valve 25 is positioned between the gas expansion chamber 222 and the high pressure gas chamber 221 through the orifice 26 ' . A first shaft of the H-shaped valve 25 is positioned just below the dimmer element 24 .

En variante, la première hampe du clapet 25 est directement liée à l'élément variateur 24. En variante encore, l'élément variateur 24 constitue la première hampe du clapet 25.Alternatively, the first shaft of the valve 25 is directly connected to the dimmer element 24 . In another variant, the dimming element 24 constitutes the first shaft of the valve 25 .

Un élément de contrainte 271 agit sur l'autre hampe du clapet 25 en forme de H pour s'opposer à un déplacement ou à une déformation de l'élément variateur de la chambre d'asservissement 23 vers la chambre de détente gaz 222.A constraining element 271 acts on the other stem of the H-shaped valve 25 to oppose a displacement or a deformation of the dimming element of the servo chamber 23 towards the gas expansion chamber 222 .

L'élément de contrainte 271 peut être un ressort fixé à une paroi de la chambre gaz haute pression 221 opposée à la paroi de séparation 26 en face de l'orifice 26'.The constraint member 271 may be a spring attached to a wall of the high pressure gas chamber 221 opposite the partition wall 26 opposite the orifice 26 ' .

La taille de l'orifice 26' est inférieure à la taille des hampes du clapet 25. Les hampes du clapet 25 peuvent avoir des dimensions différentes.The size of the orifice 26 ' is smaller than the size of the shafts of the valve 25 . The shafts of the valve 25 may have different dimensions.

La chambre air haute pression 221 est munie d'une entrée de gaz et la chambre de détente gaz 26 est munie d'une sortie de gaz.The high pressure air chamber 221 is provided with a gas inlet and the gas expansion chamber 26 is provided with a gas outlet.

Lorsque de l'air entre via la partie amont chambre d'asservissement 20 dans la chambre d'asservissement 23 à une pression Pd.a (qui est sensiblement la même que la pression dans la chambre de détente air 212 et dans le conduit air 164) inférieure à la pression Pd.g régnant dans la chambre de détente gaz 222 (qui est sensiblement la même que celle du conduite gaz 162) (Pd.a < Pd.g ), l'élément variateur 24 se déplace ou se déforme dans le sens chambre de détente gaz 222 vers chambre d'asservissement 23. Le clapet 25 est alors contraint par l'élément de contrainte 271 à venir au contact de l'élément variateur 24, et se déplace vers la paroi de séparation 26 au plus jusqu'à ce que son autre hampe vienne en butée contre cette paroi de séparation 26 du côté de la chambre gaz haute pression 221. L'arrivée de gaz dans la chambre de détente gaz 222 est alors diminuée voire coupée si le clapet ferme l'orifice 26' de la paroi de séparation 26, et la pression Pd.g diminue dans la chambre de détente gaz 222.When air enters via the upstream servo chamber portion 20 into the servo chamber 23 at a pressure P da (which is substantially the same as the pressure in the air expansion chamber 212 and in the air conduit 164) less than the pressure P dg prevailing in the gas expansion chamber 222 (which is substantially the same as that of the gas pipe 162 ) ( P da < P dg ), the element variator 24 moves or deforms in the direction of gas expansion chamber 222 to servo chamber 23 . The valve 25 is then constrained by the constraint element 271 to come into contact with the dimming element 24 , and moves towards the partition wall 26 at the most until its other stem comes into abutment against this wall. separation 26 on the side of the high pressure gas chamber 221 . The gas inlet into the gas expansion chamber 222 is then reduced or cut off if the valve closes the orifice 26 ' of the partition wall 26 , and the pressure P dg decreases in the gas expansion chamber 222 .

Lorsque la pression Pd.a régnant dans la chambre d'asservissement 25 (qui est sensiblement égale à celle qui règne dans la chambre de détente air 212 et dans le conduit air 164) est supérieure à la pression Pd.g dans la chambre de détente gaz 222 (qui est sensiblement la même que celle du conduit gaz 162), l'élément variateur 24 se déplace ou se déforme dans un sens chambre d'asservissement 23 vers chambre de détente gaz 222. L'élément variateur 24 exerce alors une contrainte sur le clapet 25 qui agit sur l'élément de contrainte 271 en s'opposant à la force de rappel de l'élément de contrainte 271. Le clapet 25 se déplace alors hors de la paroi de séparation 26. S'il était placé contre celle-ci, il n'est donc plus en butée contre la paroi de séparation 26 du côté de la chambre gaz haute pression 221 et libère alors l'orifice 26'. Le flux de gaz entrant dans la chambre de détente gaz 222 augmente, ce qui augmente la pression Pd.g qui y règne et le gaz s'échappe par la sortie dans le conduit gaz 162.When the pressure P da prevailing in the servo chamber 25 (which is substantially equal to that prevailing in the air expansion chamber 212 and in the air duct 164 ) is greater than the pressure P dg in the gas expansion chamber 222 (Which is substantially the same as that of the gas conduit 162 ), the dimming element 24 moves or is deformed in a servo chamber direction 23 towards gas expansion chamber 222 . The dimming element 24 then exerts a stress on the valve 25 which acts on the constraining element 271 by opposing the restoring force of the constraining element 271 . The valve 25 then moves out of the partition wall 26 . If it were placed against it, it is no longer in abutment against the partition wall 26 on the side of the high pressure gas chamber 221 and then releases the orifice 26 ' . The flow of gas entering the gas expansion chamber 222 increases, which increases the pressure P dg that prevails and the gas escapes through the outlet in the gas conduit 162 .

La position de l'élément variateur 24 dépend des pressions Pd.a , Pd.g de part et d'autre de l'élément variateur 24. De même, la position du clapet 25 dépend des pressions Pd.a , Pd.g de part et d'autre de l'élément variateur 24.The position of the dimming element 24 depends on the pressures P da , P dg on either side of the dimming element 24 . Similarly, the position of the valve 25 depends on the pressures P da , P dg on either side of the dimming element 24 .

Ce premier mode de réalisation du détendeur asservi permet d'obtenir une pression de gaz dans le conduit gaz 162 sensiblement égale à la pression d'air comprimé dans le conduit air 164 (Pd.g ≈ Pd.a ).This first embodiment of the slave valve provides a gas pressure in the gas conduit 162 substantially equal to the pressure of compressed air in the air duct 164 ( P dg ≈ P da ).

Dans un deuxième mode de réalisation du détendeur asservi 2 illustré sur la figure 2b, un offset est ajouté. C'est-à-dire que la pression de gaz Pd.g dans le conduit gaz est toujours supérieure d'une quantité, sensiblement constante, à la pression d'air comprimé Pd.a dans le conduit air (Pd.g ≈ Pd.a + ΔP).In a second embodiment of the slave regulator 2 illustrated on the figure 2b , an offset is added. That is to say that the gas pressure P dg in the gas duct is always greater by an amount, substantially constant, at the compressed air pressure P da in the air duct ( P dg ≈ P da + ΔP ).

Dans ce deuxième mode de réalisation, un deuxième élément de contrainte 272 agit sur l'élément variateur 24 pour créer un offset positif constant ΔP par rapport à la pression Pd.a régnant dans la chambre d'asservissement 23 In this second embodiment, a second constraint element 272 acts on the dimming element 24 to create a constant positive offset ΔP with respect to the pressure P da prevailing in the servo chamber 23

Par exemple, dans le cas où le deuxième élément de contrainte 272 est un ressort, il est positionné dans la chambre d'asservissement 23 de manière à prendre appui sur l'élément variateur 24 et une paroi de la chambre d'asservissement opposée à l'élément variateur 24. Le ressort exerce une contrainte sur l'élément variateur 24 de sorte à le forcer vers la chambre de détente gaz 222. Le reste du détendeur asservi 1 est identique au premier mode de réalisation du détendeur asservi 1.For example, in the case where the second constraint element 272 is a spring, it is positioned in the servo chamber 23 so as to bear on the dimming element 24 and a wall of the servo chamber opposite to the Variable element 24 . The spring exerts a stress on the dimming element 24 so as to force it towards the gas expansion chamber 222 . The rest of the slave regulator 1 is identical to the first embodiment of the slave regulator 1 .

Dans un troisième mode de réalisation, illustré sur la figure 2c, le deuxième élément de contrainte 272 agit toujours sur l'élément variateur 24 de façon à créer un offset positif ΔP par rapport à la pression Pd.a régnant dans la chambre d'asservissement 23. Cependant, dans ce mode de réalisation, cet offset positif ΔP est réglable grâce à des moyens de réglage 274.In a third embodiment, illustrated on the Figure 2c , the second constraint element 272 always acts on the dimming element 24 so as to create a positive offset ΔP with respect to the pressure P da prevailing in the servo chamber 23 . However, in this embodiment, this positive offset ΔP is adjustable thanks to adjustment means 274 .

Par exemple, dans le cas où le deuxième élément de contrainte 272 est un ressort, celui-ci prend appui sur l'élément variateur 24, au niveau de l'une de ses extrémités. Au niveau de l'autre de ses extrémités, le ressort prend appui sur un plateau 274 muni d'une tige en son centre et s'étendant du côté opposé au ressort. La tige peut se déplacer en un mouvement de va-et-vient parallèlement au ressort par coulissement ou vissage. Au niveau de la paroi de la chambre d'asservissement 25 opposée à l'élément variateur 24, est prévu les moyens de réglage du plateau 274 permettant de régler la hauteur z de ce plateau via sa tige. Plus le plateau 274 est proche de l'élément variateur 24 et plus l'offset est grand. Plus le plateau 274 est éloigné de l'élément variateur 24, plus l'offset est petit. Le ressort exerce une contrainte sur l'élément variateur 24 de sorte à le forcer vers la chambre de détente gaz 222. L'offset est alors dépendant de la hauteur z du plateau. La pression de gaz dans la chambre de détente gaz 222 vaut : Pd.g. = Pd.a + ΔP(z).For example, in the case where the second constraint element 272 is a spring, it rests on the dimming element 24 , at one of its ends. At the other of its ends, the spring is supported on a plate 274 provided with a rod at its center and extending on the side opposite the spring. The rod can move in a back and forth movement parallel to the spring by sliding or screwing. At the wall of the control chamber 25 opposite to the dimming element 24 is provided the adjustment means of the plate 274 for adjusting the height z of this plate via its rod. The more the plate 274 is close to the dimming element 24 and the larger the offset. The further the plate 274 is from the dimmer element 24 , the smaller the offset. The spring exerts a stress on the dimming element 24 so as to force it towards the gas expansion chamber 222 . The offset is then dependent on the height z of the plate. The gas pressure in the gas expansion chamber 222 is: P dg . = P da + ΔP (z) .

Dans un quatrième mode de réalisation, un offset négatif peut être créé. Ce mode de réalisation est illustré sur la figure 2d.In a fourth embodiment, a negative offset can be created. This embodiment is illustrated on the figure 2d .

La conception générale de ce mode de réalisation est identique au premier mode de réalisation, à l'exception d'un ajout d'un deuxième élément de contrainte 272 agissant sur l'élément variateur 24 permet d'obtenir l'offset négatif -ΔP par rapport à la pression Pd.a régnant dans la chambre d'asservissement 23.The general design of this embodiment is identical to the first embodiment, except that an addition of a second constraint element 272 acting on the dimming element 24 makes it possible to obtain the negative offset -ΔP by relative to the pressure P da prevailing in the servo chamber 23 .

Dans le cas où le deuxième élément de contrainte 272 est un ressort, celui-ci repose au niveau d'une de ses extrémités sur la première hampe du clapet 25 et, au niveau de l'autre de ses extrémités, sur la paroi de séparation 26 du côté de la chambre de détente gaz 222. Le deuxième ressort exerce une contrainte sur l'élément variateur 24 de sorte à le forcer vers la chambre d'asservissement 23. La pression régnant dans la chambre de détente gaz Pd.g vaut sensiblement Pd.a - ΔP.In the case where the second stress element 272 is a spring, it rests at one of its ends on the first shaft of the valve 25 and, at the other of its ends, on the separation wall. 26 on the side of the gas expansion chamber 222 . The second spring exerts a constraint on the dimming element 24 so as to force it towards the servo chamber 23 . The pressure in the gas expansion chamber P dg is substantially P da - ΔP .

Dans ces quatre mode de réalisation du détendeur asservi 2, l'alimentation en gaz est asservie sur l'alimentation en air comprimé, ce qui augmente la sécurité du générateur d'air chaud 1, puisqu'une alimentation en gaz sans apport d'air est évitée.In these four embodiments of the slave regulator 2 , the gas supply is slaved to the supply of compressed air, which increases the safety of the hot air generator 1 , since a supply of gas without air supply is avoided.

Le clapet 25 peut être conçu différemment de la description ci-dessus et peut présenter une forme différente de manière à pouvoir ouvrir ou fermer l'orifice 26' de la paroi de séparation 26 en fonction des mouvements ou déformations de l'élément variateur 24.The valve 25 may be designed differently from the description above and may have a different shape so as to open or close the orifice 26 ' of the partition wall 26 according to the movements or deformations of the dimmer element 24 .

De manière générale, le détendeur asservi 2 peut être utilisé pour des applications autre qu'un générateur à air chaud. Il peut être utilisé dans toutes les applications nécessitant un asservissement d'un fluide sur au autre.In general, the slave regulator 2 can be used for applications other than a hot air generator. It can be used in all applications requiring servo control of one fluid on the other.

Moyens d'allumageMeans of ignition

Des moyens d'allumage 128, par exemple un allumeur piézo-électrique, sont positionnés dans l'élément de préhension 124 en contact avec le levier d'actionnement 122. Un allumeur piézo-électrique 128 est connu, par exemple dans le document EP 1 795 803 et ne sera pas décrit plus en détail par la suite. Un fil 8 électriquement conducteur, en contact avec l'allumeur piézo-électrique, se prolonge jusqu'aux moyens de génération de flamme 6.Ignition means 128 , for example a piezoelectric igniter, are positioned in the gripping element 124 in contact with the actuating lever 122 . A piezoelectric igniter 128 is known, for example in the document EP 1 795 803 and will not be described in more detail later. An electrically conductive wire 8 , in contact with the piezoelectric igniter, extends to the flame generation means 6 .

Moyens de génération de flammeMeans of flame generation

Les moyens de génération de flamme 6, à l'intérieur de la tuyère 14, comprennent un tube rétreint 62, un brûleur 64 et un injecteur de gaz 68 formant également montant de support pour le brûleur 64.The flame generation means 6 , inside the nozzle 14 , comprise a shrink tube 62 , a burner 64 and a gas injector 68 also forming a support post for the burner 64 .

Le tube rétreint 62, possédant des extrémités avant et arrière, a une forme de cylindre droit à base généralement circulaire. La section droite du tube rétreint 62 est inférieure à la section droite de la tuyère 14. La section droite du tube rétreint 62 au niveau de l'extrémité avant se ressert légèrement. Ce resserrement 621 du tube rétreint 62 permet de contenir la flamme générée à l'intérieur de celui-ci, ou au voisinage de ce resserrement 621. La distance entre le resserrement 621 et l'extrémité de sortie de la tuyère 14 est comprise entre 2 et 8 fois le diamètre de la tuyère 14.The shrink tube 62 , having front and rear ends, has a straight cylinder shape with a generally circular base. The cross section of the narrowed tube 62 is smaller than the cross section of the the nozzle 14 . The cross-section of the narrowed tube 62 at the front end is tightened slightly. This constriction 621 of the shrink tube 62 can contain the flame generated inside thereof, or in the vicinity of this constriction 621 . The distance between the constriction 621 and the outlet end of the nozzle 14 is between 2 and 8 times the diameter of the nozzle 14 .

En variante, le tube 62 n'est pas rétreint, c'est-à-dire qu'il ne comprend pas de resserrement 621 au niveau de son extrémité avant. Dans cette variante, la flamme n'est pas contenue à l'intérieur du tube rétreint 62 et s'étend plus en avant vers l'extrémité de sortie de la tuyère 14.Alternatively, the tube 62 is not narrowed, that is to say it does not include tightening 621 at its front end. In this variant, the flame is not contained inside the shrink tube 62 and extends further towards the outlet end of the nozzle 14 .

Le tube rétreint 62 présente un même axe de révolution que la tuyère 14.The shrink tube 62 has the same axis of revolution as the nozzle 14 .

Le brûleur 64 est maintenu par l'injecteur de gaz 68 relativement dans l'axe de la tuyère 14. Il possède une partie arrière cylindrique 641 et une partie avant 642 en forme de cône divergeant vers la partie avant. La partie arrière 641 est liée à l'injecteur 68 en s'insérant dans un alésage 682 prévu dans celui-ci, et se prolonge jusqu'au voisinage du tube rétreint 62. Le gaz est éjecté de l'injecté de gaz 68 par des orifices traversant 683 mettant en communication de fluide l'espace autour de la partie arrière 641 du brûleur 64 et le conduit gaz 162. Ces orifices 683 sont positionnés de manière à ce que le gaz soit éjecté de manière tangentielle à la partie arrière 841 cylindrique du brûleur 64. The burner 64 is held by the gas injector 68 relatively in the axis of the nozzle 14 . It has a cylindrical rear portion 641 and a cone-shaped front portion 642 diverging towards the front portion. The rear portion 641 is connected to the injector 68 by fitting into a bore 682 provided therein, and extends to the vicinity of the necking tube 62 . The gas is ejected from the injected gas 68 through through-holes 683 placing in fluid communication the space around the rear portion 641 of the burner 64 and the gas conduit 162 . These orifices 683 are positioned in such a way that the gas is ejected tangentially at the cylindrical rear portion 841 of the burner 64.

Le centre du brûleur 64 est traversé par un alésage 643 longitudinal laissant passer le fil 8 électriquement conducteur en contact avec l'allumeur piézo-électrique 128. Le gaz passe, quant à lui, autour du brûleur 64 vers l'intérieur du tube rétreint 62. The center of the burner 64 is traversed by a longitudinal bore 643 passing the electrically conductive wire 8 in contact with the piezoelectric igniter 128. The gas passes, meanwhile, around the burner 64 towards the inside of the shrunk tube 62 .

La forme du brûleur 64 permet de mélanger l'air et le gaz. En effet, à la sortie de l'injecteur de gaz 68, le gaz se déplace tangentiellement à la partie arrière 641 du brûleur 64 et a tendance à s'accrocher à la paroi de celle-ci en entraînant par aspiration de l'air présent dans les parties environnantes. Ce mélange d'air et de gaz est également accéléré par le rétrécissement 621 de la section droite vers l'avant de la tuyère 14. The shape of the burner 64 makes it possible to mix the air and the gas. Indeed, at the outlet of the gas injector 68 , the gas moves tangentially to the rear portion 641 of the burner 64 and tends to cling to the wall thereof by drawing by suction of the air present in the surrounding parts. This mixture of air and gas is also accelerated by the narrowing 621 of the straight section towards the front of the nozzle 14.

Au niveau de la partie la plus large du cône formant le brûleur 64, existe une partie cylindrique 644. La différence de section entre la section comprise entre le tube rétreint 62 et la partie cylindrique 644 du brûleur 64 au niveau de la partie la plus large du cône et la section interne du tube rétreint 62 juste après l'extrémité avant du brûleur 64 provoque un écoulement turbulent du mélange d'air et de gaz ce qui permet un mélange plus homogène d'air et de gaz.At the widest part of the cone forming the burner 64, there is a cylindrical portion 644. The sectional difference between the section between the shrink tube 62 and the cylindrical portion 644 of the burner 64 at the widest end of the cone and the inner section of the shrink tube 62 just after the front end of the burner 64 causes a turbulent flow of the mixture of air and gas which allows a more homogeneous mixture of air and gas.

A l'extrémité de la partie en forme de cône 642 est prévu un évidement central servant de puits à gaz 66. Le puits à gaz 66 reçoit par son fond le fil 8 électriquement conducteur en contact avec l'allumeur piézo-électrique 128. Le fil 8 est isolé électriquement du puits à gaz 66. La différence de potentiel entre les parois du puits 66 et le fil 8 créée par l'allumeur piézo-électrique 128 provoque une étincelle qui embrase le mélange gaz/air contenu dans le puits et dans le tube rétreint 62. La flamme générée s'accroche alors à la surface avant du brûleur et au puits. Le mélange d'air et de gaz dans le puits à gaz 66 est renouvelé grâce à l'écoulement turbulent du mélange.At the end of the cone-shaped portion 642 is provided a central recess serving as a gas well 66. The gas well 66 receives at its bottom the electrically conductive wire 8 in contact with the piezoelectric igniter 128. wire 8 is electrically isolated from the gas well 66. The potential difference between the walls of the well 66 and the wire 8 created by the piezoelectric igniter 128 causes a spark that ignites the gas / air mixture contained in the well and in the the necking tube 62. The generated flame then clings to the front surface of the burner and to the well. The mixture of air and gas in the gas well 66 is renewed due to the turbulent flow of the mixture.

Le tube rétreint 62 sert de séparation afin d'obtenir un mélange aux bonnes proportions en gaz et air à l'intérieur du tube rétreint 62 et du puits à gaz 66. The shrink tube 62 serves as a separation to obtain a mixture of gas and air proportions within the shrink tube 62 and the gas well 66.

Une section S1 délimitée entre la tuyère allongée 14 et le tube rétreint 62 et une section S2 délimitée entre le tube rétreint 62 et le brûleur 64 permettent de jouer sur le mélange et la température à l'intérieur de la tuyère 14.A section S 1 delimited between the elongate nozzle 14 and the shrink tube 62 and a section S 2 delimited between the shrink tube 62 and the burner 64 make it possible to play on the mixture and the temperature inside the nozzle 14 .

De manière générale, le brûleur 64 est un brûleur à flamme stabilisée résistant au courant d'air, c'est-à-dire que la flamme reste accrocher au même endroit, par exemple un brûleur stabilisé par effet de sillage ou brûleur Coanda tel que décrit dans la demande de brevet déposé sous le numéro de dépôt européen 08290820.3 ou PCT 07/06419 .In general, the burner 64 is a stabilized flame burner resistant to the flow of air, that is to say that the flame remains hanging in the same place, for example a burner stabilized stabilizer or Coanda burner such as described in the patent application filed under the European Deposit Number 08290820.3 or PCT 07/06419 .

La présence du tube rétreint 62 a plusieurs avantages. Elle permet, entre autre, d'éviter une surchauffe de la tuyère allongée 14, et de séparer le flux d'air en deux afin de garantir une combustion propre (c'est-à-dire avec une bonne proportion de gaz et d'air pour que la combustion du gaz soit totale). En effet, le fait qu'une partie du flux d'air n'est pas chauffée permet de refroidir la tuyère allongée 14. Ceci garantit également un apport d'air frais pour une meilleure combustion et pour contenir la flamme à l'intérieur du tube rétreint 62 et au voisinage du tube rétreint 62. Cet air frais est chauffé au voisinage du resserrement 621 du tube rétreint 62 et est projeté hors de l'extrémité de sortie de la tuyère 14.The presence of the necking tube 62 has several advantages. It allows, among other things, to avoid overheating of the elongated nozzle 14, and to separate the air flow in two in order to guarantee clean combustion (that is to say with a good proportion of gas and air for total gas combustion). Indeed, the fact that a portion of the air flow is not heated to cool the elongated nozzle 14. This also ensures a supply of fresh air for better combustion and to contain the flame inside the shrunken tube 62 and in the vicinity of shrink tube 62 . This fresh air is heated in the vicinity of the constriction 621 of the narrowed tube 62 and is projected out of the outlet end of the nozzle 14 .

FonctionnementOperation

Le générateur d'air chaud 1 selon l'invention est mis en fonctionnement par l'opérateur lorsque celui-ci, tenant la poignée 12, exerce une pression sur le levier d'actionnement 122. Cette pression contraint le levier d'actionnement 122 à pivoter autour de la partie basse de l'élément de préhension 124 ou à se déplacer en translation vers l'élément de préhension 124. The hot air generator 1 according to the invention is operated by the operator when the latter, holding the handle 12, exerts pressure on the actuating lever 122. This pressure forces the actuating lever 122 to pivot around the lower part of the gripping element 124 or to move in translation towards the gripping element 124.

Le déplacement du levier d'actionnement 122 entraîne l'ouverture de vannes dans les conduits gaz 162 et air 164 laissant passer ainsi l'air comprimé et le gaz.The displacement of the actuating lever 122 causes the opening of valves in the gas ducts 162 and air 164 thus allowing the compressed air and the gas to pass.

L'air comprimé passe alors dans le conduit air 164 avant d'être injecté par l'injecteur d'air en amont du venturi 4. L'injection d'air comprimé à travers le venturi 4 entraîne une aspiration d'air ambiant qui entre par l'extrémité arrière du générateur d'air chaud 1. L'air ambiant se mélange alors à l'air comprimé au niveau du venturi 4 et avant qu'une première fraction ne passe à travers les moyens de génération de flamme 6. L'autre fraction passe alors à travers le passage défini entre le tube rétreint 62 et la tuyère allongée 14.The compressed air then passes into the air duct 164 before being injected by the air injector upstream of the venturi 4. The injection of compressed air through the venturi 4 causes a suction of ambient air which enters through the rear end of the furnace 1 . The ambient air then mixes with the compressed air at the venturi 4 and before a first fraction passes through the flame generation means 6. The other fraction then passes through the passage defined between the tube shrinks 62 and the elongated nozzle 14 .

Le gaz passe dans le conduit gaz 162 avant d'être injecté par l'injecteur de gaz 68 autour du brûleur 64. Le gaz entre dans le tube rétreint 62 avec la première fraction du mélange d'air ambiant/air comprimé.The gas passes into the gas conduit 162 before being injected by the gas injector 68 around the burner 64. The gas enters the shrink tube 62 with the first fraction of the ambient air / compressed air mixture.

Le puits 66 se remplit de gaz et du mélange d'air ambiant/air comprimé.The well 66 fills with gas and the mixture of ambient air / compressed air.

Le déplacement du levier d'actionnement 122 occasionne une contrainte sur l'allumeur piézo-électrique 128 comme décrit dans le document EP 1 795 803 ce qui entraîne la création d'une étincelle dans le puits 66 par le fil 8 isolé électriquement du puits à gaz 66, embrasant le mélange gaz/air ambiant/air comprimé.The movement of the actuating lever 122 causes a constraint on the piezoelectric igniter 128 as described in the document EP 1 795 803 which causes the creation of a spark in the well 66 by the wire 8 electrically isolated from the gas well 66, igniting the gas / ambient air / compressed air mixture.

Une flamme se produit alors dans le tube rétreint 62 et se propage jusqu'au voisinage de son resserrement 621. A flame then occurs in the narrowed tube 62 and propagates to the vicinity of its constriction 621.

La flamme chauffe alors l'autre fraction du mélange air ambiant/air comprimé qui est passée par le passage défini entre le tube rétreint 62 et la tuyère allongée 14. The flame then heats the other fraction of the ambient air / compressed air mixture which has passed through the passage defined between the narrowed tube 62 and the elongate nozzle 14.

Le mélange air ambiant/air comprimé chauffé traverse alors la partie avant 142 de la tuyère allongée 14 jusqu'à l'extrémité de sortie de la tuyère 14. Ce mélange d'air ambiant/air comprimé peut alors être utilisé pour chauffer de la matière.The ambient air / heated compressed air mixture then passes through the front portion 142 of the elongated nozzle 14 to the outlet end of the nozzle 14. This mixture of ambient air / compressed air can then be used to heat the material. .

La température d'air en sorti du générateur d'air chaud est comprise entre 300 °C et 1 000 °C.The air temperature exiting the furnace is between 300 ° C and 1000 ° C.

Contrôle de l'étanchéité du circuit de gazChecking the tightness of the gas circuit

La conception du générateur d'air chaud 1 tel qu'il est prévu par l'invention facilite le contrôle de l'étanchéité du circuit de gaz.The design of the hot air generator 1 as provided by the invention facilitates the control of the tightness of the gas circuit.

En effet, l'injecteur de gaz 68 comprend un espace torique intérieur 681 en communication de fluide avec le conduit gaz 162. Il possède également un alésage 682 pour accueillir le brûleur 64. Le diamètre de l'alésage 682 est inférieur au diamètre interne de l'espace torique 681. L'alésage 682 et l'espace torique 681 ont le même axe de révolution que la tuyère 14 et le tube rétreint 62. Indeed, the gas injector 68 comprises an inner toric space 681 in fluid communication with the gas conduit 162. It also has a bore 682 to accommodate the burner 64. The diameter of the bore 682 is smaller than the internal diameter of the O-space 681. The bore 682 and the O-space 681 have the same axis of revolution as the nozzle 14 and the narrowed tube 62.

Sur une surface avant, tournée vers l'avant de la tuyère 14, de l'injecteur de gaz 68, est prévu un ou plusieurs orifices 683 traversant entre l'extérieur et l'espace torique intérieur 681 de l'injecteur 68. C'est par cet/ces orifice(s) 683 que sort le gaz. Par exemple, l'injecteur de gaz comprend plusieurs orifices 683. Par exemple encore, les orifices 683 sont au nombre de quatre pouvant être régulièrement espacés ou non, autour de l'alésage 682. On a front surface, facing the front of the nozzle 14, the gas injector 68, is provided one or more orifices 683 passing between the outside and the inner toric space 681 of the injector 68. C ' is by this / these orifice (s) 683 that the gas leaves. For example, the gas injector comprises several orifices 683. For example still, the orifices 683 are four in number that can be evenly spaced or not, around the bore 682.

Pour un contrôle d'étanchéité, une broche 91 est utilisée. La broche 91 est un élément allongé de révolution, formé d'au moins de deux cylindres 911, 912 de sections différentes. Ces deux cylindres 911, 912 peuvent être rapportés l'un sur l'autre ou réalisés en une seule pièce. Au niveau de l'interface entre les deux cylindres 911, 912 de sections différentes, une surface d'appui 91s est présente sur le cylindre 911 de plus grande section.For a tightness check, a pin 91 is used. Pin 91 is an elongated element of revolution formed of at least two cylinders 911, 912 of different sections. These two cylinders 911, 912 can be reported one on the other or made in one piece. At the interface between the two cylinders 911, 912 of different sections, a bearing surface 91s is present on the cylinder 911 of larger section.

Lors d'un contrôle d'étanchéité du circuit de gaz, le brûleur 64 est retiré de l'injecteur de gaz 68. La broche 91 est insérée à la place du brûleur 64 par sa partie de plus petite section 912. Entre la surface d'appui 91s et la surface avant de l'injecteur de gaz 68 sont placés une pièce de friction 92 et un joint torique 93 de façon à ce que la pièce de friction 92 soit au contact de la surface d'appui 91s d'un côté et du joint torique 93 de l'autre. Le joint torique 93 est au contact de la surface avant de l'injecteur de gaz 68 de façon à ce qu'il bouche, de manière étanche, le ou les orifices 683 présents sur cette surface avant 68s quand la broche 91 est forcée vers l'injecteur de gaz 68. During a leak test of the gas circuit, the burner 64 is removed from the gas injector 68. The pin 91 is inserted in place of the burner 64 by its smaller section 912. Between the surface of the burner 64 91s and the front surface of the gas injector 68 are placed a friction piece 92 and an O-ring 93 so that the friction piece 92 is in contact with the bearing surface 91s on one side and O-ring 93 on the other. The O-ring 93 is in contact with the front surface of the gas injector 68 so that it closes, in a sealed manner, or the orifices 683 present on this front surface 68s when the pin 91 is forced towards the gas injector 68.

La pièce de friction 92 permet d'éviter que le joint torique 93 ne tourne alors qu'il est en contact avec la surface avant 68s de l'injecteur de gaz 68 tout en permettant à l'opérateur de tourner la broche 91 lors de son insertion dans l'injecteur de gaz 68. En effet, puisque la surface avant de l'injecteur de gaz 68 présente des orifices 683 que le joint torique 93 recouvre, celui-ci peut être détérioré par frottement s'il tourne tout en étant forcé vers la surface avant 68s de l'injecteur de gaz 98. The friction piece 92 prevents the O-ring 93 from rotating while it is in contact with the front surface 68s of the gas injector 68 while allowing the operator to turn the pin 91 during its operation. insertion into the gas injector 68. Indeed, since the front surface of the gas injector 68 has orifices 683 that the O-ring 93 covers, it can be deteriorated by friction if it turns while being forced. to the front surface 68s of the gas injector 98.

Le contrôle de l'étanchéité est alors effectué sur l'injecteur de gaz 68 alors qu'il est dans sa configuration finale. Du gaz est injecté dans le circuit de gaz, pour vérifier qu'il n'y ait pas de fuite.The tightness check is then performed on the gas injector 68 while it is in its final configuration. Gas is injected into the gas system to check for leaks.

Après le contrôle, il suffira à l'opérateur d'enlever la broche 91, la pièce de friction 92 et le joint torique 93 et d'insérer dans l'injecteur de gaz 68 le brûleur 64. After the check, it will be sufficient for the operator to remove the pin 91, the friction piece 92 and the O-ring 93 and to insert the burner 64 into the gas injector 68 .

Claims (16)

  1. Portable hot air generator (1) comprising:
    - a handle (12) comprising means for igniting (128);
    - an elongated nozzle (14) connected to the handle (12) comprising an outlet end for the ejection of the hot air;
    - a flame generator (6) inside the elongated nozzle (14);
    - a venturi (4), upstream of the flame generator (6), formed on the elongated nozzle (14);
    characterised in that the generator further comprises:
    - a gas conduit (162) passing through the handle (12) and intended to convey a combustible gas in the elongated nozzle (14) and at the level of the flame generator (6);
    - an air conduit (164) passing through the handle (12) and intended to convey compressed air in the elongated nozzle (14) and upstream of the venturi;
    - a servo-controlled pressure regulator (2) controlling a gas pressure (Pd.g) in the gas conduit (162) according to an air pressure (Pd.a) in the air conduit (164).
  2. Generator (1) according to claim 1,
    characterised in that the flame generator (6) comprises a tube (62) placed in the nozzle (14), a burner (64) and a gas injector (68), the tube (62) is arranged at least partially around the burner and intended to cut a flow of fresh air into two.
  3. Generator (1) according to claim 2,
    characterised in that the tube (62) is a swaged tube, with the section of the swaged tube (62) being tightened on its portion closest to the outlet end of the nozzle (14).
  4. Generator (1) according to claim 2 or 3,
    characterised in that the gas injector (68) comprises a bore (682), having the same axis as the nozzle (14), for the insertion of the burner (64), and at least one orifice (683) through which exits the gas, with this orifice or these orifices (683) being arranged in such a way that the gas exits tangentially to the burner (64).
  5. Generator (1) according to one of claims 2 to 4,
    characterised in that the burner (64) is a stabilised flame burner, i.e. the flame generated remains attached to the same place.
  6. Generator (1) according to claim 5,
    characterised in that the stabilised flame burner (64) is either a stabilised burner via the wake effect or a Coanda burner.
  7. Generator (1) according to one of claims 1 to 6,
    characterised in that the means for igniting (128) are a piezoelectric ignitor coupled to an electrically conductive wire (8) at its contact and that extends to the flame generator (6).
  8. Generator (1) according to one of claims 1 to 7,
    characterised in that the servo-controlled pressure regulator (2) comprises a servo-control chamber (23) in fluidic communication with the air conduit (161) and downstream of an air expansion chamber (212), a highpressure gas chamber (221), and a gas expansion chamber (222) in fluidic communication with the gas conduit (162),
    characterised in that the servo-control chamber (23) is separated from the gas expansion chamber (222) by a variator element (24) that is displaced or is deformed in response to a difference in pressure between a pressure (Pd.a) in the servo-control chamber (23) and a pressure (Pd.g) in the gas expansion chamber (222), with a first element of constraint (271) opposing the displacement or the deformation of the variator element (24) when the latter is displaced or is deformed towards the gas expansion chamber (222).
  9. Generator (1) according to claim 8,
    characterised in that the variator element (24) is a disc that is displaced via translation in response to the difference in pressure between the pressure (Pd.a) in the servo-control chamber (23) and the pressure (Pd.g) in the gas expansion chamber (222), with the disc having on its edges an O-ring seal that makes it possible to provide the seal between the servo-control chamber (23) and the gas expansion chamber (222).
  10. Generator (1) according to claims 8,
    characterised in that the variator element (24) is a membrane that is deformed in response to the difference in pressure between the pressure (Pd.a) in the servo-control chamber (23) and the pressure (Pd.g) in the gas expansion chamber (222), with the membrane having edges fixed in a sealed manner on a wall of the servo-control (23) and gas expansion (222) chambers.
  11. Generator (1) according to one of claims 8 to 10, characterised in that the servo-controlled pressure regulator (2) further comprises a second element of constraint (272) suited to create a pressure offset between the pressure (Pd.a) in the servo-control chamber (23) and the pressure (Pd.g) in the gas expansion chamber (222).
  12. Generator (1) according to claim 11,
    characterised in that the second element of constraint (272) is a second spring provided in the servo-control chamber and intended to create an offset in such a way that the gas pressure in the gas conduit (162) is always greater by a substantially constant quantity than the air pressure in the air conduit (161).
  13. Generator (1) according to claim 12,
    characterised in that the second spring (272) has a fulcrum with a fixed height in the servo-control chamber and is intended to create an offset substantially constant.
  14. Generator (1) according to claim 12,
    characterised in that the second spring (272) has a fulcrum of variable height (z) in the servo-control chamber and is intended to create a variable offset.
  15. Generator (1) according to claim 11,
    characterised in that the second element of constraint (272) is a second spring (272) provided in the gas expansion chamber (222) and intended to create an offset in such a way that the gas pressure in the gas conduit (162) is always less by a substantially constant quantity than the air pressure in the air conduit (161).
  16. Generator (1) according to one of claims 2 to 15, characterised in that the gas injector (68) further comprises an inner O-ring space (681) in fluidic communication with the gas conduit (162) of which the inner diameter is greater than the diameter of the bore (681), one or several through-orifices (683), putting into fluidic communication the O-ring space (681) and the inside of the nozzle (14), on a surface (68s) turned towards the outlet end of the nozzle (14), with the bore (682), the O-ring space (681) and the nozzle (14) having substantially the same axis.
EP09171318.0A 2008-09-26 2009-09-25 Hot-air generator Not-in-force EP2169309B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0856484A FR2936593B1 (en) 2008-09-26 2008-09-26 HOT AIR GENERATOR

Publications (2)

Publication Number Publication Date
EP2169309A1 EP2169309A1 (en) 2010-03-31
EP2169309B1 true EP2169309B1 (en) 2017-08-16

Family

ID=40577965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09171318.0A Not-in-force EP2169309B1 (en) 2008-09-26 2009-09-25 Hot-air generator

Country Status (5)

Country Link
US (2) US8585397B2 (en)
EP (1) EP2169309B1 (en)
CN (1) CN101684969B (en)
CA (1) CA2679015C (en)
FR (1) FR2936593B1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE515666T1 (en) * 2005-10-28 2011-07-15 Sefmat HOT AIR BURNER/GENERATOR WITH INTERNAL IGNITION
FR2945853B1 (en) 2009-05-25 2013-02-15 Guilbert Express Sa HAND TOOL WITH INCORPORATED BURNER AND DETACHABLE PIEZOELECTRIC IGNITION ASSEMBLY.
FR2975169B1 (en) * 2011-05-11 2019-07-19 Sefmat BURNER HOT AIR GENERATOR WITH INTERCHANGEABLE IGNITION.
TWI614455B (en) 2016-11-21 2018-02-11 Heat gun for lifting the diversion effect
US20180142920A1 (en) * 2016-11-21 2018-05-24 Pro-Iroda Industries, Inc. Heat Gun with Self-Cooling System
TWI764091B (en) 2020-02-10 2022-05-11 愛烙達股份有限公司 Gas heating tool
FR3113717B1 (en) * 2020-08-27 2022-08-26 Sefmat Gas injection device for a hot air generator
KR102660460B1 (en) * 2024-03-12 2024-04-24 주식회사 아이비케이테크 Hot air spray device with adjustable pressure

Family Cites Families (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1449382A (en) * 1915-11-29 1923-03-27 American Telephone & Telegraph Method and means for signaling with high-frequency waves
US3217782A (en) * 1962-05-03 1965-11-16 Coen Co Abnormal fuel pressure cut off and purge system
US3404702A (en) * 1967-09-18 1968-10-08 Malsbary Mfg Company Liquid fuel supply system
US3917442A (en) * 1971-11-10 1975-11-04 Dimiter S Zagoroff Heat gun
US3866839A (en) * 1974-08-02 1975-02-18 Edward J Magner Torch head construction
US4082497A (en) * 1976-03-29 1978-04-04 Ex-Cell-O Corporation High capacity quiet burner for hot air heating system
US4058713A (en) * 1976-09-20 1977-11-15 General Signal Corporation Equalization by adaptive processing operating in the frequency domain
GB1555752A (en) * 1977-02-04 1979-11-14 Dunlop Ltd Indirect heat transfer apparatus
GB2030280B (en) * 1977-09-29 1982-03-10 Hadland & Olive Ltd Heat gun
US4365338A (en) * 1980-06-27 1982-12-21 Harris Corporation Technique for high rate digital transmission over a dynamic dispersive channel
EP0054583B1 (en) * 1980-12-23 1984-03-07 International Business Machines Corporation Method of transmitting binary data sequences and arrangement for enabling the rapid determination of the end of a transmitted binary data sequence
US4643669A (en) * 1985-08-26 1987-02-17 Peabody Engineering Corporation Smokeless flare gas burner
US4798530A (en) * 1987-04-21 1989-01-17 Sestrap Arvo M Nozzle assembly for hot air torch
US4720259A (en) * 1987-05-11 1988-01-19 Day Jerry J Hand torch
US5023889A (en) * 1988-05-31 1991-06-11 California Institute Of Technology Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels
US5127051A (en) * 1988-06-13 1992-06-30 Itt Corporation Adaptive modem for varying communication channel
US5260972A (en) * 1990-03-13 1993-11-09 At&T Bell Laboratories Technique for determining signal dispersion characteristics in communications systems
US5105443A (en) * 1990-05-29 1992-04-14 At&T Bell Laboratories Inband coding of secondary data
US5394440A (en) * 1991-02-06 1995-02-28 General Datacomm, Inc. High speed modem systems incorporating distribution preserving Tomlinson encoding and decoding for secondary channels
US5111155A (en) * 1991-03-04 1992-05-05 Motorola, Inc. Distortion compensation means and method
US5263051A (en) * 1991-07-05 1993-11-16 Codex Corporation Device and method of interleaving for a trellis precoding system
US5267269A (en) * 1991-09-04 1993-11-30 Level One Communications, Inc. System and method employing predetermined waveforms for transmit equalization
US5297733A (en) * 1991-09-16 1994-03-29 Plastic Flamecoat Systems, Inc. Flame spray gun
US5541964A (en) * 1993-08-30 1996-07-30 At&T Corp. Distortion compensation technique
US5841484A (en) * 1994-02-10 1998-11-24 Philips Electronics North North America Corporation Blind equalizer method and apparatus for HDTY transmission using an NTSC rejection filter for mitigating co-channel interference
US5602602A (en) * 1994-02-10 1997-02-11 Philips Electronics North America Corporation Method and apparatus for combating co-channel NTSC interference for digital TV transmission having a simplified rejection filter
US5485481A (en) * 1994-06-28 1996-01-16 Seastar Optics Inc. Fibre-grating-stabilized diode laser
JP2768296B2 (en) * 1994-09-26 1998-06-25 日本電気株式会社 Signal processing device
US5625642A (en) * 1994-10-11 1997-04-29 Lucent Technologies Inc. Spread-response precoding system having signature sequences longer than the inter-symbol time interval
US5649824A (en) * 1995-02-21 1997-07-22 Stagg; Stanley E. Portable heating device
DE19617675A1 (en) * 1996-05-03 1997-11-13 Domagala Walter Gas-operated shrinking device for foil wrapping
US6010329A (en) * 1996-11-08 2000-01-04 Shrinkfast Corporation Heat gun with high performance jet pump and quick change attachments
US5989011A (en) * 1997-07-18 1999-11-23 Caruso; Pat Burner control system
US6445750B1 (en) * 1998-04-22 2002-09-03 Lucent Technologies Inc. Technique for communicating digitally modulated signals over an amplitude-modulation frequency band
DE29924886U1 (en) * 1998-06-05 2006-06-08 Samsung Electronics Co., Ltd., Suwon Channel coding device for communication system
CN1144375C (en) * 1998-08-20 2004-03-31 三星电子株式会社 Apparatus and method for pre-inserting known bits in an input stage of a channel encoder
GB2350018B (en) * 1999-05-08 2003-07-30 Motorola Ltd A method of and apparatus for estimating a characteristic of a signal
US6687310B1 (en) * 1999-05-27 2004-02-03 Zenith Electronics Corporation Trellis coded modulation system for digital television signal with trellis coded data and synchronization symbols
ATE313479T1 (en) * 1999-07-08 2006-01-15 Abb Lummus Global Inc SUBSTRUCTURE WITH WIDED BASE FOR A PLATFORM ANCHORED WITH TENSIONING ELEMENTS
US7415061B2 (en) * 1999-08-31 2008-08-19 Broadcom Corporation Cancellation of burst noise in a communication system with application to S-CDMA
WO2001043310A2 (en) * 1999-12-03 2001-06-14 Broadcom Corporation Embedded training sequences for carrier acquisition and tracking
KR100386572B1 (en) * 1999-12-24 2003-06-02 엘지전자 주식회사 System for Digital TV translator
US20030021341A1 (en) * 2000-04-24 2003-01-30 Vigil Armando J. Method of effective backwards compatible ATSC-DTV multipath equalization through training symbol induction
EP1154603A1 (en) * 2000-05-08 2001-11-14 Hewlett-Packard Company, A Delaware Corporation Training of equalisers, for use with signals of differing data rates
KR100360622B1 (en) * 2000-06-12 2002-11-13 주식회사 문화방송 MPEG Data frame structure and transmitting and receiving system using the same
US6912258B2 (en) * 2000-07-07 2005-06-28 Koninklijke Philips Electtronics N.V. Frequency-domain equalizer for terrestrial digital TV reception
US6760374B1 (en) * 2000-09-19 2004-07-06 Rockwell Collins, Inc. Block decision feedback equalization method and apparatus
US7031382B2 (en) * 2000-10-24 2006-04-18 Harris Corporation Non-linear equalizer system and method
KR100674423B1 (en) * 2001-01-19 2007-01-29 엘지전자 주식회사 Transmission / reception system and data processing method
US7206352B2 (en) * 2001-04-02 2007-04-17 Koninklijke Philips Electronics N.V. ATSC digital television system
US7111221B2 (en) * 2001-04-02 2006-09-19 Koninklijke Philips Electronics N.V. Digital transmission system for an enhanced ATSC 8-VSB system
KR100706508B1 (en) * 2001-04-25 2007-04-11 엘지전자 주식회사 Digital TV's VBS Communication System
US20030099303A1 (en) * 2001-06-04 2003-05-29 Koninklijke Philips Electronics N.V. Digital television (DTV) transmission system using enhanced coding schemes
US7035353B2 (en) * 2001-10-24 2006-04-25 Zenith Electronics Corporation Channel estimation method blending correlation and least-squares based approaches
US6973137B2 (en) * 2001-12-03 2005-12-06 Koninklijke Philips Electronics N.V. Apparatus and method for generating robust ATSC 8-VSB bit streams
DE20207179U1 (en) * 2002-05-07 2002-12-05 MAN Roland Druckmaschinen AG, 63075 Offenbach Grinding drive for a roller in a processing machine, in particular in a printing machine
CN2542936Y (en) * 2002-05-18 2003-04-02 左绍民 Electronic gas torch
US7085985B2 (en) * 2002-05-31 2006-08-01 Broadcom Corporation Close two constituent trellis of a turbo encoder within the interleave block
AU2003288781A1 (en) * 2003-01-06 2004-07-29 Electronics And Telecommunications Research Institute Digital television transmitter and receiver for transmitting and receiving dual stream using 4 level vestigial side band robust data
US7341074B2 (en) * 2005-05-19 2008-03-11 Gm Global Technology Operations, Inc. Multi-stage pressure regulator
FR2894325B1 (en) * 2005-12-06 2013-04-26 Guilbert Express Sa MODULAR GAS COMBUSTION HAND TOOL
FR2921146B1 (en) * 2007-09-13 2010-02-26 Guilbert Express Sa HAND TOOL WITH ENHANCED GAS COMBUSTION
US20090197212A1 (en) * 2008-02-04 2009-08-06 Maxitrol Company Premix Burner Control System and Method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US20100081105A1 (en) 2010-04-01
US8585397B2 (en) 2013-11-19
CN101684969A (en) 2010-03-31
CA2679015C (en) 2015-11-24
FR2936593B1 (en) 2010-10-15
FR2936593A1 (en) 2010-04-02
CN101684969B (en) 2013-05-22
EP2169309A1 (en) 2010-03-31
CA2679015A1 (en) 2010-03-26
US20130302019A1 (en) 2013-11-14

Similar Documents

Publication Publication Date Title
EP2169309B1 (en) Hot-air generator
FR2571438A1 (en) FUEL INJECTOR TYPE A ACCUMULATION
EP3189937B1 (en) Improvements to a gas-powered fastening tool
EP0964206B1 (en) Variable geometry gas turbine combustor chamber
FR2911634A1 (en) DEVICE FOR FUEL INJECTION IN A TURBOMACHINE
FR2904374A1 (en) VALVE WITH DERIVED CHANNEL INCORPORATING A HEATING MEMBER AND INTAKE CIRCUIT WITH AIR PREHEATING FOR THERMAL ENGINE
FR3078142A1 (en) COMBUSTION CHAMBER HAVING TWO TYPES OF INJECTORS IN WHICH THE SEALING BODIES HAVE A DIFFERENT OPENING THRESHOLD
EP0577451B1 (en) Device for controlling the pneumatic injection of carburetted mixture for a two stroke internal combustion engine and its use
FR3046742A1 (en) GAS FASTENING TOOL AND METHOD OF OPERATING SAME
FR2739416A1 (en) FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINE
EP1225326B1 (en) Conduit obturation system, in particular for ramjet air conduits
FR2860859A1 (en) HEATING APPARATUS WITH A SPRAY NOZZLE
FR3046741A1 (en) GAS FASTENING TOOL
FR2944347A1 (en) Mortar for throwing projectile along curve path, has adjusting valve lowering pressure at interior of chamber, where valve is controlled based on pressure setpoint and measure is carried out by senor
FR2811379A1 (en) Fuel injector for IC engine
FR3059565A1 (en) DEVICE FOR EVAPORATING AND / OR MIXING A PRECURSOR LIQUID OF A CATALYST FOR IMPROVING COMBUSTION
EP3977013A1 (en) Pre-vaporizing pipe, combustion assembly provided therewith and turbomachine provided therewith
CH651356A5 (en) CARBURETOR FOR INTERNAL COMBUSTION ENGINE.
FR2934649A1 (en) Fuel injecting device for internal combustion engine i.e. diesel engine, has control piston for closing control chamber supplied with high pressure fuel by inlet nozzle, where inlet nozzle presents variable fuel passage section
EP3426906B1 (en) Rocket engine with ground ignition
EP0758438B1 (en) Device for the coordinated control of the flow of at least two gases, and burner comprising such device
FR3129463A1 (en) Fuel-fired boiler comprising a pressure reduction device for ignition of the flame
EP2623918A1 (en) Pneumatic launching device
FR2912500A1 (en) Pyrotechnic gas generator for load transporting and dropping system of airplane, has relay charge igniting fuel when fuel is initiated by igniter, where fuel with propellant grain is arranged in chamber to ensure regular combustion of fuel
FR2697606A1 (en) Valve for controlling the flow of a fluid under pressure through the passage section between two inlet and outlet ducts.

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

17P Request for examination filed

Effective date: 20090925

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

17Q First examination report despatched

Effective date: 20140805

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20170302

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 919426

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170915

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602009047729

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170816

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 919426

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170816

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

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171116

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171216

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171117

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171116

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

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602009047729

Country of ref document: DE

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

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170930

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

Ref country code: LU

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

Effective date: 20170925

26N No opposition filed

Effective date: 20180517

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

Effective date: 20171116

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

Ref country code: CH

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

Effective date: 20170930

Ref country code: IE

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

Effective date: 20170925

Ref country code: LI

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

Effective date: 20170930

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

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

Ref country code: BE

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

Effective date: 20170930

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

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

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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: 20171116

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

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20090925

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

Ref country code: CY

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

Effective date: 20170816

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

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170816

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

Ref country code: DE

Payment date: 20220916

Year of fee payment: 14

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

Ref country code: FR

Payment date: 20220810

Year of fee payment: 14

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602009047729

Country of ref document: DE

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: 20230930

Ref country code: DE

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

Effective date: 20240403