EP0240751B1 - Brûleur à main à basse pression - Google Patents

Brûleur à main à basse pression Download PDF

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Publication number
EP0240751B1
EP0240751B1 EP87103323A EP87103323A EP0240751B1 EP 0240751 B1 EP0240751 B1 EP 0240751B1 EP 87103323 A EP87103323 A EP 87103323A EP 87103323 A EP87103323 A EP 87103323A EP 0240751 B1 EP0240751 B1 EP 0240751B1
Authority
EP
European Patent Office
Prior art keywords
casing
nozzle
combustion chamber
section
burner according
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.)
Expired - Lifetime
Application number
EP87103323A
Other languages
German (de)
English (en)
Other versions
EP0240751A3 (en
EP0240751A2 (fr
Inventor
Thadeus Lawrecki
Karl-Heinz Velte
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.)
Rothenberger Werkzeugemaschinen GmbH
Original Assignee
Rothenberger Werkzeugemaschinen GmbH
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 Rothenberger Werkzeugemaschinen GmbH filed Critical Rothenberger Werkzeugemaschinen GmbH
Priority to AT87103323T priority Critical patent/ATE60421T1/de
Publication of EP0240751A2 publication Critical patent/EP0240751A2/fr
Publication of EP0240751A3 publication Critical patent/EP0240751A3/de
Application granted granted Critical
Publication of EP0240751B1 publication Critical patent/EP0240751B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/52—Nozzles for torches; for blow-pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/76—Protecting flame and burner parts

Definitions

  • the invention relates to a low-pressure hand burner for liquefied petroleum gas for flaming surfaces with an injector system for the supply of fuel gas and the production of a fuel gas-air mixture by sucking in ambient air, with a mixing tube connected to the circumference of the injector system and a closed one the opposite end of which has a burner head with a nozzle body, in which there is a central nozzle for the exit of the fuel gas-air mixture and the formation of a full flame, and to which a combustion chamber, which extends in the direction of flow and has a single jacket, is attached, which has at least one opening for the entry of further ambient air.
  • the openings are made in the form of cylindrical bores in the rear wall of the combustion chamber and at a distance from the jacket thereof, so that turbulence and rapid mixing of the cold ambient air with the hot flame gases occur.
  • the combustion process can be improved and the flame temperature reduced in this way, the hot flame gases still come into contact with the jacket of the combustion chamber, so that it heats up very much and poses a danger to the environment, particularly to the operator, becomes.
  • Such an admixture of ambient air also does not stabilize the flame emerging from the combustion chamber, and its range is at least not appreciably increased.
  • Such a flame is particularly sensitive to cross currents, which are practically unavoidable when working outdoors. The lowering of the flame temperature by admixing ambient air is understandably very undesirable for numerous applications in which a high flame temperature is important.
  • a high pressure burner supplied with compressed air and gas is known from DE-GM 81 16 007 and the corresponding EP-OS 0 066 164, in which the actual burner nozzle is designed as an annular nozzle to form a hollow flame.
  • the combustion chamber consists of two ring-shaped baffles of different diameters, which are connected to one another by radial and possibly inclined spacers to form air inlet openings. Additional air inlet openings are also provided in the interior of the ring nozzle.
  • the annular nozzle is surrounded by one of the annular baffles without a gap, no additional air can enter the back of the baffle in question, which flows parallel to the baffle and the baffle and keeps the flame away from the baffle.
  • a jacket made of sucked-in air is formed between the hollow flame and a central compressed air jet, through which particles are fed, which are to be used for flame spraying. If holes are provided in the annular guide plate connected to the ring nozzle, the axes of which are then necessarily perpendicular or radial to the burner axis and to the hollow flame, the secondary air flowing in through these holes can no longer form a cooling jacket air flow. Rather, it makes the hollow flame susceptible to cross currents, which inevitably occur when working outdoors.
  • a low-pressure burner for liquid gases is known, in which the injector system projects into a perforated jacket tube, which in turn has a coaxial combustion chamber, a so-called flame tube.
  • a perforated jacket tube which in turn has a coaxial combustion chamber, a so-called flame tube.
  • Ambient air is sucked into the space between the jacket tube and the flame tube as well as into the flame tube itself, but due to the design and the flow distribution, it does not contact the flame tube as a cold air jacket. Rather, the flame tube should be expressly heated quickly and kept at a high temperature in order to improve the combustion process.
  • a low pressure hand torch in which a very low gas outlet temperature is to be achieved.
  • an injector system is connected via a mixing tube to a combustion chamber, in the rear part of which is turned away from the mouth, a flame holder is arranged which, in the cross section left open by it, generates a flow rate so high that the flame burning in front of the flame holder breaks through into the Mixing tube is prevented.
  • no secondary air is supplied to the combustion chamber itself, and it should even be explicitly avoided that the flame flow separates from the walls of the combustion chamber.
  • the invention is therefore based on the object of specifying a hand burner of the type described in the introduction, in which a stable flame is achieved despite maintaining a high flame temperature and excessive heating of the jacket of the combustion chamber is reliably avoided.
  • the at least one air inlet opening has a flow axis aligned parallel to the direction of flow of the gas-air mixture and on the outside from the jacket of the combustion chamber and on the inside of the nozzle body is limited and extends over most of the circumference of the jacket, such that the further ambient air can be guided in the immediate vicinity and essentially parallel to the respectively adjacent jacket line of the jacket.
  • the burner according to the invention differs from the last-mentioned known burners in that the burner head has a central nozzle and a combustion chamber with a single jacket, that is to say it has a very simple construction.
  • the features of the claim characterizing the features according to the invention are particularly important, which relate to the fact that the at least one air inlet opening has a flow axis aligned parallel to the direction of flow of the gas-air mixture, outwards from the jacket of the combustion chamber and inwards from Nozzle body is limited.
  • the further ambient air is carried out in the immediate vicinity and essentially parallel to the respectively adjacent jacket line of the jacket, so that the resulting full flame burns stably within the combustion chamber without reaching the combustion chamber jacket, which is laminar due to the between the combustion chamber jacket and the flame flowing cold air jacket is effectively cooled or kept at a low temperature level.
  • the burner head only consists of the nozzle body and the jacket of the combustion chamber.
  • the invention creates the conditions for ensuring that the ambient air sucked in through the openings by the injection effect of the flame is not mixed with the hot flame gases in the shortest possible way, but flows along the entire circumference of the jacket as a protective film of cold air protecting the jacket of the combustion chamber , up to the outlet of the combustion chamber. It can be assumed that this so-called jacket flow is largely laminar up to the outlet opening. If you look into the opening of the combustion chamber with the necessary precautions, you can see that the hot flame front ends about a millimeter in front of the combustion chamber jacket (seen in the radial direction to the combustion chamber axis).
  • the measures according to the invention make it very easy to obtain a stable, hot, long-range flame which can be influenced far less by cross currents than a flame produced without the subject matter of the invention.
  • the combustion chamber jacket is kept at such a low temperature that organic substances which come into contact with the burner are not thermally damaged.
  • the subject of the invention can be used in slaughterhouses, e.g. for flaming the hair or bristles of carcasses, but especially for surface heating, as is often the case with road and roofing work.
  • the advantages of the burner are fully unfolded, particularly in roofing work involving the gluing of foil webs to a roof skin: by touching the combustion chamber jacket with the roof skin, extinguishers can no longer be burned into it, as is the case when storing or bumping the conventional one Burner on the finished roof skin or on the roll-shaped film sheets (when laying) was often observed.
  • the combustion chamber jacket can also be made much shorter in the flame direction than, for example, the known flame guide tubes.
  • the effective part of the flame is exposed and enables the burner to be handled more flexibly, quite apart from the fact that considerable material and weight savings are the result.
  • the burners described below as exemplary embodiments could be operated reliably with propane or mixtures of butane and propane within a pressure range of 1.5 to 5 bar and with a stable flame. Within this pressure range, the flame size or heating output could be regulated without any problems.
  • the nozzle body is delimited on its outer circumference by a regular polygonal prism surface, preferably by a hexagonal prism, and if the jacket is cylindrical in the region of the nozzle body.
  • a corresponding number of openings are formed between the relevant partial length of the jacket and the nozzle body, which have the shape of circular segments directly abutting the jacket, which are arranged practically without gaps on the circumference of the jacket, of short distances apart from the prism corners. These openings pass into the combustion chamber without any step on the side of the combustion chamber shell, so that the flow cannot be stopped on the side of the shell.
  • the starting material for the production of the prism-shaped nozzle body is commercially available, for example in the form of regular hexagonal rods.
  • the subject matter of the invention can be used for a wide variety of burner cross sections, for example also for burners with a circular cross section or rotationally symmetrical flame, the subject matter of the invention can be used with particular advantage in burners with a slot-shaped nozzle. Such burners are required for the generation of fan-shaped flames.
  • Such a burner is characterized according to the further invention in that the nozzle has a substantially rectangular cross section, that the jacket has a circular cross section at its end adjacent to the nozzle and an elongated outlet cross section at its end remote from the nozzle, the longest axis of which is parallel runs to the longest axis of the nozzle and is longer than the inner diameter of the circular cross section.
  • a burner in connection with the device according to the invention for generating the jacket-air flow, stable flame guidance can be achieved with a fan-shaped flame which emerges from the outlet cross-section with a length of 20-25 cm and is one in the distance mentioned Has a width of about 40 to 50 cm.
  • a burner is particularly well suited for roofing work for gluing film sheets to a roof skin, because a temperature profile that is as uniform as possible is essential.
  • Such a burner has also proven to be particularly stable with respect to cross-currents in the ambient air. Such cross currents are known to occur on roofs of particular strength.
  • FIGS. 1-9 Two exemplary embodiments of the subject matter of the invention are described in more detail below with reference to FIGS. 1-9.
  • a burner head 1 is shown in FIGS. 1 to 4, the essential parts of which are a nozzle body 2 and the jacket 3 of a combustion chamber 4 made of sheet metal.
  • a nozzle body 2 In the nozzle body 2 there is a nozzle 5 which is supplied with a fuel gas / air mixture from a blind bore 6.
  • the nozzle 5 opens into a flat end face 7 of the nozzle body 2 and there has an essentially rectangular cross section, as can be seen in particular from a consideration of FIG. 4. It does not matter whether the two ends of this cross-section are rounded or not.
  • the nozzle 5, starting from the cylindrical blind bore 6, widens in a fan shape (see recess 5a) in the direction of the end face 7.
  • the arrangement is made mirror-symmetrically, i.e. the axis of the blind bore 6 lies in the same plane of symmetry in which the longest axis of the outlet cross section of the nozzle 5 lies in the end face 7.
  • the width of the recess forming the nozzle 5 is smaller and its length at the outlet end of the recess is larger than the diameter of the blind bore 6.
  • the dimensions of the nozzle are chosen so that the flow velocity in the nozzle cross section is greater than the speed of propagation of the flame, so that it cannot strike back into the blind bore 6 and into the mixing tube connected to it.
  • the blind bore 6 has at its outer end a thread 8 for screwing in the one (bent) end of the mixing tube 9, the other end of which is shown in FIG. 5.
  • the nozzle body 2 is formed from a regular hexagon profile, as can be seen in particular from FIG. 3. The back part this profile is turned outside the thread 8, but this is of minor importance.
  • the nozzle body 2 has longitudinal edges 2a, which are removed over a partial length of the nozzle body 2 at a radial depth that corresponds to the wall thickness of the jacket 3 of the combustion chamber 4. In this way, the shoulder surfaces 2b of the remaining part of the longitudinal edges 2a form stops for the jacket 3 (FIGS. 6 and 7).
  • the jacket 3 is captively connected to the nozzle body by hollow rivets 10 (FIG. 1).
  • the skin thickness is about 1 mm.
  • openings 11 are formed between the nozzle body 2 and the jacket 3, which is cylindrical at this point, and have the shape of narrow circular segments, as can easily be seen in FIGS. 3 and 4. These openings 11 serve in the manner described at the beginning for the entry of the ambient air, as symbolized in FIG. 2 by the arrows 12.
  • the jacket 3 has an elongated outlet cross section 13 at its end facing away from the nozzle 5, the geometric shape of which is best shown in FIG. 4.
  • the shape of this elongated cross-section is preferably oval, but can also have a different shape if the flame is spread out in a fan shape.
  • the longest axis of the outlet cross section 13 runs parallel to the longest axis of the nozzle and is longer than the inner diameter of the circular cross section at the connection point of the jacket 3 with the nozzle body 2.
  • FIGS and 4 that the shortest axis of the elongated outlet cross-section 13 is shorter than the inner diameter of the circular cross-section of the jacket 3 at said connection point.
  • the jacket 3 produced in such a way that an essentially conical sheet metal jacket is first formed, which is subsequently deformed into the shape according to FIGS. 1 and 2.
  • Fig. 4 can also be seen that the longest axis of the nozzle 5 lies in a surface diagonal of the radially extending end face 7 of the hexagonal prism.
  • FIG. 5 essentially shows known device parts, namely the end of the mixing tube 9 facing away from the burner head, to which a feed device 14 for a fuel gas / air mixture is connected.
  • This supply device has an injector nozzle 15 for introducing the fuel gas, which is supplied via a connecting coupling 16 from a storage container, not shown.
  • the admixture of ambient air takes place via several radial openings 17 according to the principle of the so-called Bunsen burner.
  • an ignitable fuel gas / air mixture can also be produced in another way.
  • FIGS. 6 to 9 show the conditions or processes on a burner head 20, in which the outer contours of the nozzle body 2, however, correspond to those of FIGS. 1 to 4.
  • the circular design of the jacket 21 was also maintained in the area of the nozzle body 2, so that largely the same flow conditions occur at least at the beginning of the combustion chamber 22.
  • the jacket 21, however, has the shape of a cone jacket below the end face 7 of the nozzle body 2, so that a rotationally symmetrical flame results.
  • the jacket 3 or 21 of the combustion chamber 4 or 22 forms a guide device which is reliably cooled by the jacket air flow and stabilizes the flame, i.e. the flame essentially follows the direction of the surface lines of the shell 3 or 21, at least on the initial path outside the combustion chamber.
  • the width of the flats is small in relation to the length of the openings 11 in the circumferential direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Gas Separation By Absorption (AREA)
  • Fuel Cell (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Manipulator (AREA)

Claims (12)

1. Brûleur pour chalumeau manuel à basse pression alimenté en gaz liquide destiné au traitement des surfaces à la flamme, avec un système d'injection (15) pour l'alimentation en gaz combustible et la production d'un mélange air-gaz combustible par aspiration d'air ambiant, avec en aval du système d'injection (15) un tube de mélangeage (9) fermé sur sa circonférence et une tête de brûleur (1) disposée à l'extrémité de celui- ci, avec un corps de buse (2) dans lequel se trouve une buse centrale (5) pour la sortie du mélange air-gaz combustible et la formation d'une flamme de section pleine et sur laquelle est fixée une chambre de combustion (4) s'étendant dans le sens de l'écoulement et présentant une seule enveloppe (3), qui possède au moins une ouverture (11) pour l'entrée d'air ambiant supplémentaire, caractérisé en ce que l'ouverture d'entrée d'air (11) au moins unique présente un axe d'écoulement orienté parallèlement à la direction d'écoulement du mélange air-gaz combustible et est délimitée extérieurement par l'enveloppe (3, 21) de la chambre de combustion (4, 22) et vers l'intérieur par le corps de buse (2) et s'étend sur la plus grande partie de la circonférence de l'enveloppe (3, 21 ) au niveau des ouvertures (11), si bien que l'air ambiant secondaire peut être guidé à proximité immédiate de la génératrice immédiatement adjacente de l'enveloppe (3, 21) et de manière essentiellement parallèle à celle-ci.
2. Brûleur selon la revendication 1, caractérisé en ce que l'enveloppe (3, 21) de la chambre de combustion (4, 22) est montée sur le corps de buse (2) en formant plusieurs ouvertures d'entrée d'air (11).
3. Brûleur selon la revendication 2, caractérisé en ce que le corps de buse (2) est délimité sur sa circonférence extérieure par une surface prismatique polygonale régulière et en ce que l'enveloppe (3, 21) est de forme cylindrique au niveau du corps de buse (2).
4. Brûleur selon la revendication 3, caractérisé en ce que le corps de buse (2) est délimité sur sa circonférence extérieure par un prisme hexagonal.
5. Brûleur selon la revendication 3, caractérisé en ce que les arêtes longitudinales (2a) du prisme sont éliminées sur une partie de la longueur du corps de buse (2) sur une profondeur radiale qui correspond à l'épaisseur de la paroi de l'enveloppe (3, 21 ) de la chambre de combustion (4, 22), si bien que les épaulements (2b) de la partie conservée des arêtes longitudinales (2a) forme des butées pour l'enveloppe (3, 21).
6. Brûleur selon la revendication 1, caractérisé en ce que la buse (5) présente une section essentiellement rectangulaire, en ce que l'enveloppe (3) est de section cylindrique à son extrémité voisine de la buse et, à son extrémité opposée à la buse (5) une section de sortie allongée (13) dont le grand axe est parallèle au grand axe de la buse et est plus grand que le diamètre intérieur de la section circulaire.
7. Brûleur selon la revendication 6, caractérisé en ce que le petit axe de la section de sortie allongée (13) est plus petit que le diamètre intérieur de la section circulaire.
8. Brûleur selon la revendication 4, caractérisé en ce que le grand axe de la buse (5) est situé sur une diagonale de la face (7) du prisme hexagonal.
9. Brûleur selon la revendication 6, caractérisé en ce qu'il existe dans le corps de buse (2) du côté du raccordement du tube de mélangeage (9) un trou borgne (6) qui se recoupe symétriquement avec un décrochement (5a) en forme de fente, ouvert sur la chambre de combustion et élargi en forme d'éventail, l'axe du trou borgne (6) se situant dans le plan de symétrie et la largeur du décrochement étant plus petite et sa longueur à l'extrémité de sortie du décrochement plus grande que le diamètre du trou borgne (6).
10. Brûleur selon la revendication 6, caractérisé en ce que le rapport entre la distance axiale en son centre par rapport à la face (7) d'une aire placée au travers de la section de sortie (13) et le grand axe de la section de sortie de la buse (5) au niveau de la face du corps de buse 2 est comprise entre 1:1 et 1:1,5.
11. Brûleur selon la revendication 6, caractérisé en ce que l'angle d'ouverture de la buse (5) dans le sens de la largeur correspond essentiellement à l'angle d'ouverture de l'enveloppe (3), les angles d'ouverture se situant dans le plan de symétrie de la chambre de combustion (4) dans lequel se situe également le grand axe de la section de sortie (13).
12. Brûleur selon la revendication 11, caractérisé en ce que les angles d'ouverture sont compris entre 30 et 60 degrés, de préférence entre 40 et 50 degrés.
EP87103323A 1986-04-07 1987-03-09 Brûleur à main à basse pression Expired - Lifetime EP0240751B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87103323T ATE60421T1 (de) 1986-04-07 1987-03-09 Niederdruck-handbrenner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611592 1986-04-07
DE19863611592 DE3611592A1 (de) 1986-04-07 1986-04-07 Handbrenner

Publications (3)

Publication Number Publication Date
EP0240751A2 EP0240751A2 (fr) 1987-10-14
EP0240751A3 EP0240751A3 (en) 1988-09-21
EP0240751B1 true EP0240751B1 (fr) 1991-01-23

Family

ID=6298106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103323A Expired - Lifetime EP0240751B1 (fr) 1986-04-07 1987-03-09 Brûleur à main à basse pression

Country Status (3)

Country Link
EP (1) EP0240751B1 (fr)
AT (1) ATE60421T1 (fr)
DE (2) DE3611592A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100657A1 (de) * 1991-01-11 1992-07-16 Rothenberger Werkzeuge Masch Tragbarer brenner fuer brenngas mit zwei mischrohren
DE29512230U1 (de) * 1995-07-28 1996-12-19 Aga Ab Brenner für die Feuerpolitur von Glas

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2105637A5 (fr) * 1970-09-15 1972-04-28 Instal Chauffage Automat
BE791005A (fr) * 1971-11-10 1973-03-01 Zagoroff Dimiter S Procede et appareillage de chauffage a basse temperature et de contraction de matiere plastique
FR2375542A1 (fr) * 1976-12-24 1978-07-21 Guilbert & Fils Leon Appareil debitant un fluide gazeux chaud, notamment pour la retraction des matieres plastiques
DE2838500A1 (de) * 1978-09-04 1980-03-06 Helmut Gruen Brenner fuer gasfoermige brennstoffe, insbesondere fluessiggas, wie propan, butan o.dgl.
DE3121370A1 (de) * 1981-05-29 1983-05-19 Korel Korrosionsschutz-Elektronik Gmbh & Co Kg, 4030 Ratingen Pressluft-gasbrenner zum betrieb von flammspritzpistolen und als trockner
DE8116007U1 (de) * 1981-05-29 1985-08-08 Korel Korrosionsschutz-Elektronik Gmbh & Co Kg, 4030 Ratingen Pressluft-Gasbrenner zum Betrieb von Flammspritzpistolen und als Trockner

Also Published As

Publication number Publication date
DE3767528D1 (de) 1991-02-28
EP0240751A3 (en) 1988-09-21
EP0240751A2 (fr) 1987-10-14
ATE60421T1 (de) 1991-02-15
DE3611592A1 (de) 1987-10-08

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