EP0460500B1 - Hand shrink apparatus - Google Patents
Hand shrink apparatus Download PDFInfo
- Publication number
- EP0460500B1 EP0460500B1 EP91108658A EP91108658A EP0460500B1 EP 0460500 B1 EP0460500 B1 EP 0460500B1 EP 91108658 A EP91108658 A EP 91108658A EP 91108658 A EP91108658 A EP 91108658A EP 0460500 B1 EP0460500 B1 EP 0460500B1
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- EP
- European Patent Office
- Prior art keywords
- nozzle
- hand
- held
- shrinking apparatus
- mixing
- 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
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
- B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
Definitions
- the invention relates to a hand-held shrinking device with an injector burner, which has an outlet nozzle designed as a flat nozzle and a fuel gas nozzle which is arranged in a mixing nozzle which tapers in the direction of flow and which draws combustion air through its larger cross-section, and with a combustion chamber.
- Hand shrinking devices are known in various designs. They are used to shrink shrink films that surround a stack of goods or the like. Via a fuel gas supply, which is connected to a handle containing control devices, valves and the like, fuel gas is fed to the hand shrinking device and is mixed with combustion air in the mixing chamber. The mixture is burned in a combustion chamber and from there it passes through an outlet nozzle into the open or into the area of the shrink film to be shrunk.
- the injector burner has only a single mixing nozzle. In order to achieve a sufficient mixing of fuel gas and combustion air, the mixing nozzle must be relatively long. The hand shrinking device must also be correspondingly large, so that its handiness is unsatisfactory. Furthermore, the performance of a hand shrinking device is limited due to this construction.
- the object of the invention is to improve the performance and handiness of a hand shrinking device.
- the hand shrinking device By connecting several mixing nozzles in series, the mixture of fuel gas and combustion air is accelerated and the hand shrinking device can be built shorter for the same output or designed for higher output.
- a version is recommended in which the cross sections of the outlet orifices of the mixing nozzles increase in the direction of flow, so that the flow velocities within the hand shrinking device remain within reasonable limits. This will result in complete combustion reached in the area of the combustion chamber and outlet nozzle and ensured that no flames emerge from the outlet nozzle.
- the mixing nozzle arranged in front of the combustion chamber is a Venturi nozzle, in which in particular the outlet mouth widens up to the cross section of the combustion chamber. Then a largely calmed flow enters the combustion chamber, which is usually designed and e.g. is also equipped with a flame holder.
- the mixing nozzles are expediently housed in a housing which has air inlet openings on the circumference, which lead to the suction ends of the mixing nozzles. Since considerable suction noises and / or mixing noises can occur with such a hand-shrinking device, it is advantageous if the housing is surrounded by a soundproofing jacket at least in the area of the air inlet openings.
- a preferred embodiment of the invention is characterized in that the flat nozzle has a wall made of a material with low thermal conductivity and high heat resistance.
- the wall of the flat nozzle should consist of ceramic.
- the wall can also have an inner jacket and / or outer jacket made of sheet metal.
- a flame holder and an ignition device are arranged in the region of a combustion chamber arranged in the flow direction in front of the flat nozzle
- Ignitor consists of an electrically conductive ignition cable embedded with housing parts and a free end of the ignition cable protrudes into the pipe section. It is understood that the pipe section is open on the combustion chamber side and ends at the flame holder or in the flow direction behind the flame holder and that the free end of the ignition cable is arranged in the open end of the pipe section, so that an ignition spark can always ignite only the mixture located in the combustion chamber.
- the stability of the flame in the combustion chamber is not only guaranteed by the flame holder arranged there, but can also be supported by appropriate design of the components preceding in the direction of flow, the arrangement of the fuel gas nozzle being particularly important.
- the invention recommends arranging the fuel gas nozzle at a distance L1 from the outlet opening of the next mixing nozzle, which corresponds to 1.5 to 2.5 times the diameter D1 of this outlet opening. If the fuel gas nozzle beyond has a teardrop shape, with the slender end pointing in the direction of flow, very high fuel gas velocities essential for the injector effect are achieved.
- the hand shrinking device shown in the drawing is intended for shrinking shrink film which, for example, surrounds a stack of goods.
- the basic structure of the hand shrinking device consists of an elongated housing 1 and a handle 2 connected to it.
- a fuel gas hose (not shown) can be connected to the handle 2 and can thus be connected to a fuel gas line 3 guided inside the handle 2.
- a not shown belongs to the fuel gas line 3 Valve, which is housed in the handle 2, which can also contain other control devices and an ignition device.
- the fuel gas line 3 opens at a fuel gas nozzle 4 through which the fuel gas emerges in the longitudinal direction of the housing or in the flow direction 5.
- 4 mixing nozzles 6, 7 and a Venturi nozzle 8 are arranged behind the fuel gas nozzle.
- the respective upstream mixing nozzles 6 project with their outlet opening 9 into the suction end 10 of the mixing nozzle 7 arranged downstream.
- the fuel gas nozzle 4 is arranged in the region of the suction end 10 of the upstream mixing nozzle 6.
- the downstream mixing nozzle 7 projects with its outlet opening into the suction end 10 of the Venturi nozzle 8 or is arranged in the region of this suction end.
- the housing 1 has peripheral air inlet openings that lead to the suction ends 10 of the mixing nozzles 6, 7 and the Venturi nozzle 10. In the area of the air inlet openings 11, the housing 1 is surrounded by a soundproof jacket 12.
- a mixing chamber 13 adjoins the outlet opening of the Venturi nozzle 8, the cross section of which corresponds to the cross section of the outlet opening 9 of the Venturi nozzle 8.
- the mixing chamber 13 is followed in the flow direction 5 by a combustion chamber 14 with an outlet nozzle 15.
- the mixing chamber 13 and the combustion chamber 14 can have customary internals, eg. B. a turbulence grid 16 in the mixing chamber and / or one Flame holder 17 in the combustion chamber 14.
- an ignition device 21 is arranged in the center in the area of the flame holder 17, which in the embodiment shown includes a pipe section 22 which is connected to housing parts in an electrically conductive manner.
- a pipe section 22 which is connected to housing parts in an electrically conductive manner.
- the z. B. can consist of PTFE.
- an ignition cable 24 is embedded, the free End 25 protrudes into a chamber of the tube section 22 open towards the combustion chamber 14.
- the fuel gas nozzle 4 has a teardrop shape, the slimmer end pointing in the direction of flow 5.
- the end of the fuel gas nozzle 4 is arranged at a distance L1 from the outlet opening 9 of the next mixing nozzle 6, which corresponds to 1.5 to 2.5 times the diameter D1 of this outlet nozzle 9.
- the hand-held shrinking device shown works as follows: Under the injector action of the fuel gas emerging from the fuel gas nozzle 4, air is sucked into the mixing nozzle 6, which mixes with the fuel gas. The mixture passes through the outlet opening 9 of the mixing nozzle 6 into the mixing nozzle 7, in which air is in turn sucked in by the injector action. The same applies when the resulting mixture enters the Venturi nozzle 8.
- the length of the hand shrinking device can be kept shorter with a comparable hand shrinking device with the same performance.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gas Burners (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Vehicle Body Suspensions (AREA)
- Nozzles (AREA)
- Manipulator (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Handschrumpfgerät mit einem Injektorbrenner, der eine als Flachdüse ausgebildete Austrittsdüse und eine Brenngasdüse aufweist, die in einer sich in Strömungsrichtung verjüngenden Mischdüse angeordnet ist, die durch ihr Ende mit dem größeren Querschnitt Verbrennungsluft ansaugt, und mit einer Verbrennungskammer.The invention relates to a hand-held shrinking device with an injector burner, which has an outlet nozzle designed as a flat nozzle and a fuel gas nozzle which is arranged in a mixing nozzle which tapers in the direction of flow and which draws combustion air through its larger cross-section, and with a combustion chamber.
Handschrumpfgeräte sind in verschiedenen Ausführungen bekannt. Mit ihnen werden Schrumpffolien, die einen Gutstapel oder dergleichen umgeben, geschrumpft. Über eine Brenngaszuführung, die an einen Steuereinrichtungen, Ventile und dergleichen enthaltenden Handgriff angeschlossen ist, wird dem Handschrumpfgerät Brenngas zugeführt, welches in der Mischkammer mit Verbrennungsluft gemischt wird. Das Gemisch wird in einer Brennkammer verbrannt und gelangt von dort über eine Austrittsdüse ins Freie bzw. in den Bereich der zu schrumpfenden Schrumpffolie. Bei einem bekannten Handschrumpfgerät der eingangs beschriebenen Gattung (DE-A-28 22 192) weist der Injektorbrenner nur eine einzige Mischdüse auf. Um eine hinreichende Vermischung von Brenngas und Verbrennungsluft zu erreichen, muß die Mischdüse verhältnismäßig lang sein. Entsprechend groß muß auch das Handschrumpfgerät ausgebildet sein, so daß dessen Handlichkeit unbefriedigend ist. Ferner ist wegen dieser Konstruktion die Leistung eines Handschrumpfgerätes begrenzt.Hand shrinking devices are known in various designs. They are used to shrink shrink films that surround a stack of goods or the like. Via a fuel gas supply, which is connected to a handle containing control devices, valves and the like, fuel gas is fed to the hand shrinking device and is mixed with combustion air in the mixing chamber. The mixture is burned in a combustion chamber and from there it passes through an outlet nozzle into the open or into the area of the shrink film to be shrunk. In a known hand shrinking device of the type described at the beginning (DE-A-28 22 192), the injector burner has only a single mixing nozzle. In order to achieve a sufficient mixing of fuel gas and combustion air, the mixing nozzle must be relatively long. The hand shrinking device must also be correspondingly large, so that its handiness is unsatisfactory. Furthermore, the performance of a hand shrinking device is limited due to this construction.
Aufgabe der Erfindung ist es, die Leistung und die Handlichkeit eines Handschrumpfgerätes zu verbessern.The object of the invention is to improve the performance and handiness of a hand shrinking device.
Diese Aufgabe wird dadurch gelöst, daß in Strömungsrichtung hintereinander mehrere Mischdüsen angeordnet sind, wobei die jeweils stromaufwärts angeordnete Mischdüse mit ihrer Austrittsmündung in das Ansaugende der jeweils stromabwärts angeordneten Mischdüse ragt, und daß das Austrittsende der Flachdüse Abmessungen nach Maßgabe des Verhältnisses
aufweist, wobei
- T =
- Höhe des Austrittsendes
- l =
- axiale Länge der Brennkammer vor dem Flammenhalter
- L =
- axiale Länge der Brennkammer vor dem Flammenhalter plus axiale Länge der Flachdüse
- D =
- Durchmesser der Flachdüse am Eintrittsende
ist.This object is achieved in that a plurality of mixing nozzles are arranged one behind the other in the direction of flow, the respectively upstream mixing nozzle with its outlet opening protruding into the suction end of the respectively downstream mixing nozzle, and in that the outlet end of the flat nozzle has dimensions in accordance with the ratio
has, wherein
- T =
- Exit end height
- l =
- axial length of the combustion chamber in front of the flame holder
- L =
- axial length of the combustion chamber in front of the flame holder plus axial length of the flat nozzle
- D =
- Diameter of the flat nozzle at the inlet end
is.
Durch die Hintereinanderschaltung mehrerer Mischdüsen wird die Mischung von Brenngas und Verbrennungsluft beschleunigt und das Handschrumpfgerät kann bei gleicher Leistung kürzer gebaut werden oder auch für eine höhere Leistung ausgelegt werden. Es empfiehlt sich eine Ausführung, bei der die Querschnitte der Austrittsmündungen der Mischdüsen in Strömungsrichtung zunehmen, damit die Strömungsgeschwindigkeiten innerhalb des Handschrumpfgerätes in vertretbaren Grenzen bleiben. Damit wird eine vollständige Verbrennung im Bereich von Brennkammer und Austrittsdüse erreicht und sichergestellt, daß keine Flammen aus der Austrittsdüse austreten.By connecting several mixing nozzles in series, the mixture of fuel gas and combustion air is accelerated and the hand shrinking device can be built shorter for the same output or designed for higher output. A version is recommended in which the cross sections of the outlet orifices of the mixing nozzles increase in the direction of flow, so that the flow velocities within the hand shrinking device remain within reasonable limits. This will result in complete combustion reached in the area of the combustion chamber and outlet nozzle and ensured that no flames emerge from the outlet nozzle.
Bei einer bevorzugten Ausführung der Erfindung ist die vor der Brennkammer angeordnete Mischdüse eine Venturidüse, bei der sich insbesondere die Austrittsmündung bis auf den Querschnitt der Brennkammer erweitert. Dann gelangt eine weitgehend beruhigte Strömung in die Brennkammer, die üblicherweise ausgebildet ist und z.B. auch mit einem Flammenhalter ausgerüstet ist.In a preferred embodiment of the invention, the mixing nozzle arranged in front of the combustion chamber is a Venturi nozzle, in which in particular the outlet mouth widens up to the cross section of the combustion chamber. Then a largely calmed flow enters the combustion chamber, which is usually designed and e.g. is also equipped with a flame holder.
Zweckmäßig werden die Mischdüsen in einem Gehäuse untergebracht, welches umfangsseitig Lufteintrittsöffnungen aufweist, die zu den Ansaugenden der Mischdüsen führen. Da bei einem derartigen Handschrumpfgerät erhebliche Ansauggeräusche und/oder Mischgeräusche entstehen können, ist es vorteilhaft, wenn das Gehäuse wenigstens im Bereich der Lufteintrittsöffnungen von einem Schallschutzmantel umgeben ist.The mixing nozzles are expediently housed in a housing which has air inlet openings on the circumference, which lead to the suction ends of the mixing nozzles. Since considerable suction noises and / or mixing noises can occur with such a hand-shrinking device, it is advantageous if the housing is surrounded by a soundproofing jacket at least in the area of the air inlet openings.
Eine bevorzugte Ausführung der Erfindung ist dadurch gekennzeichnet, daß die Flachdüse eine Wandung aus einem Material mit geringer Temperaturleitfähigkeit und großer Hitzebeständigkeit aufweist. Insbesondere soll die Wandung der Flachdüse aus Keramik bestehen. Die Wandung kann ferner einen Innenmantel und/oder Außenmantel aus Blech aufweisen. Damit lassen sich die Auswirkungen der hohen Temperaturen im Bereich der Austrittsdüse auf das Handschrumpfgerät selbst weitgehend reduzieren, so daß es auch möglich ist, die Flachdüse in einem Gehäuseabschnitt des Handschrumpfgerätes unterzubringen. Damit wird wiederum die Stabilität des Gerätes insgesamt verbessert.A preferred embodiment of the invention is characterized in that the flat nozzle has a wall made of a material with low thermal conductivity and high heat resistance. In particular, the wall of the flat nozzle should consist of ceramic. The wall can also have an inner jacket and / or outer jacket made of sheet metal. The effects of the high temperatures in the area of the outlet nozzle on the hand shrinking device itself can thus be largely reduced, so that it is also possible to accommodate the flat nozzle in a housing section of the hand shrinking device. This in turn improves the overall stability of the device.
Um zu erreichen, daß die Verbrennung des Gemisches aus Brenngasen und Verbrennungsluft erst kurz vor Eintritt in die Austrittsdüse beginnt, ist es zweckmäßig, wenn im Bereich einer in Strömungsrichtung vor der Flachdüse angeordneten Brennkammer ein Turbulenzgitter, ein Flammenhalter sowie ein Zündgerät angeordnet sind, wobei das Zündgerät aus einem elektrisch leitend mit Gehäuseteilen eingebetteten Zündkabel besteht und wobei ein freies Ende des Zündkabels in den Rohrabschnitt ragt. Es versteht sich, daß der Rohrabschnitt brennkammerseitig offen ist und am Flammenhalter oder in Strömungsrichtung hinter dem Flammenhalter endet und daß im offenen Ende des Rohrabschnittes das freie Ende des Zündkabels angeordnet ist, so daß ein Zündfunke stets nur das in der Brennkammer befindliche Gemisch zünden kann.In order to ensure that the combustion of the mixture of fuel gases and combustion air only begins shortly before entering the outlet nozzle, it is expedient if a turbulence grille, a flame holder and an ignition device are arranged in the region of a combustion chamber arranged in the flow direction in front of the flat nozzle Ignitor consists of an electrically conductive ignition cable embedded with housing parts and a free end of the ignition cable protrudes into the pipe section. It is understood that the pipe section is open on the combustion chamber side and ends at the flame holder or in the flow direction behind the flame holder and that the free end of the ignition cable is arranged in the open end of the pipe section, so that an ignition spark can always ignite only the mixture located in the combustion chamber.
Die Stabilität der Flamme in der Brennkammer wird nicht nur durch den dort angeordneten Flammenhalter gewährleistet, sondern kann auch unterstützt werden durch entsprechende Gestaltung der in Strömungsrichtung vorangehenden Bauteile, wobei insbesondere auch die Anordnung der Brenngasdüse von Bedeutung ist. Hier empfiehlt die Erfindung, die Brenngasdüse in einem Abstand L1 von der Austrittsöffnung der nächsten Mischdüse anzuordnen, der dem 1,5- bis 2,5fachen des Durchmessers D1 dieser Austrittsöffnung entspricht. Wenn die Brenngasdüse darüber hinaus eine tropfenförmige Gestalt aufweist, wobei das schlanke Ende in Strömungsrichtung weist, erreicht man sehr große, für die Injektorwirkung wesentliche Brenngasgeschwindigkeiten.The stability of the flame in the combustion chamber is not only guaranteed by the flame holder arranged there, but can also be supported by appropriate design of the components preceding in the direction of flow, the arrangement of the fuel gas nozzle being particularly important. Here, the invention recommends arranging the fuel gas nozzle at a distance L1 from the outlet opening of the next mixing nozzle, which corresponds to 1.5 to 2.5 times the diameter D1 of this outlet opening. If the fuel gas nozzle beyond has a teardrop shape, with the slender end pointing in the direction of flow, very high fuel gas velocities essential for the injector effect are achieved.
Im folgenden wird ein in der Zeichnung dargestelltes Ausführungsbeispiel der Erfindung erläutert; es zeigen:
- Fig. 1
- schematisch und teilweise einen Längsschnitt durch ein Handschrumpfgerät,
- Fig. 2
- eine andere Ausführung des Gegenstandes nach Fig. 1,
- Fig. 3
- im vergrößerten Maßstab einen Ausschnitt aus dem Gegenstand nach Fig. 2 im Bereich der Austrittsdüse,
- Fig. 4
- den Gegenstand nach Fig. 3 mit weiteren Einzelheiten,
- Fig. 5
- im vergrößerten Maßstab einen Ausschnitt aus Fig. 2 im Bereich der Brenngasdüse.
- Fig. 1
- schematically and partially a longitudinal section through a hand shrinking device,
- Fig. 2
- another embodiment of the object of FIG. 1,
- Fig. 3
- on an enlarged scale, a section of the object according to FIG. 2 in the area of the outlet nozzle,
- Fig. 4
- 3 with further details,
- Fig. 5
- on a larger scale, a detail from FIG. 2 in the area of the fuel gas nozzle.
Das in der Zeichnung dargestellte Handschrumpfgerät ist zum Schrumpfen von Schrumpffolie bestimmt, welche beispielsweise einen Gutstapel umgibt. Das Handschrumpfgerät besteht in seinem grundsätzlichen Aufbau aus einem langgestreckten Gehäuse 1 und einem daran angeschlossenen Handgriff 2. An den Handgriff 2 ist ein nicht dargestellter Brenngasschlauch anschließbar und dadurch mit einer innerhalb des Handgriffes 2 geführten Brenngasleitung 3 verbindbar. Zur Brenngasleitung 3 gehört ein nicht dargestelltes Ventil, welches im Handgriff 2 untergebracht ist, der außerdem auch weitere Steuereinrichtungen sowie eine Zündeinrichtung enthalten kann. Die Brenngasleitung 3 mündet an einer Brenngasdüse 4, durch die das Brenngas in Längsrichtung des Gehäuses bzw. in Strömungsrichtung 5 austritt.The hand shrinking device shown in the drawing is intended for shrinking shrink film which, for example, surrounds a stack of goods. The basic structure of the hand shrinking device consists of an elongated housing 1 and a handle 2 connected to it. A fuel gas hose (not shown) can be connected to the handle 2 and can thus be connected to a fuel gas line 3 guided inside the handle 2. A not shown belongs to the fuel gas line 3 Valve, which is housed in the handle 2, which can also contain other control devices and an ignition device. The fuel gas line 3 opens at a fuel gas nozzle 4 through which the fuel gas emerges in the longitudinal direction of the housing or in the flow direction 5.
In Strömungsrichtung 5 sind hinter der Brenngasdüse 4 Mischdüsen 6, 7 und eine Venturidüse 8 angeordnet. Die jeweils stromaufwärts angeordnete Mischdüsse 6 ragt mit ihrer Austrittsöffnung 9 in das Ansaugende 10 der jeweils stromabwärts angeordneten Mischdüse 7. Die Brenngasdüse 4 ist im Bereich des Ansaugendes 10 der stromaufwärtigen Mischdüse 6 angeordnet. Die stromabwärtige Mischdüse 7 ragt mit ihrer Austrittsöffnung in das Ansaugende 10 der Venturidüse 8 bzw. ist im Bereich dieses Ansaugendes angeordnet.In the flow direction 5, 4
Die Querschnitte der Austrittsöffnungen 9 der aufeinander folgenden Düsen nehmen in Strömungsrichtung 5 zu. Das Gehäuse 1 weist umfangsseitige Lufteintrittsöffnungen auf, die zu den Ansaugenden 10 der Mischdüsen 6, 7 und der Venturidüse 10 fuhren. Im Bereich der Lufteintrittsöffnungen 11 ist das Gehäuse 1 von einem Schallschutzmantel 12 umgeben.The cross sections of the
An die Austrittsöffnung der Venturidüse 8 schließt eine Mischkammer 13 an, deren Querschnitt dem Querschnitt der Austrittsöffnung 9 der Venturidüse 8 entspricht. Auf die Mischkammer 13 folgt in Strömungsrichtung 5 eine Brennkammer 14 mit Austrittsdüse 15. Die Mischkammer 13 und die Brennkammer 14 können übliche Einbauten aufweisen, z. B. ein Turbulenzgitter 16 in der Mischkammer und/oder einen Flammenhalter 17 in der Brennkammer 14.A mixing
Bei der in den Fig. 2 bis 5 dargestellten Ausführung erstreckt sich das Gehäuse 1 bis über die als Flachdüse ausgebildete Austrittsdüse 15, so daß diese Austrittsdüse 15 in einen Gehäuseabschnitt eingebettet ist. Die Austrittsdüse 15 besitzt eine Wandung 18 aus Keramik, die außenseitig von einen Außenmantel 19 aus Blech und innenseitig von einen Innenmantel 20 aus Blech abgedeckt ist. Die Abmessungen der als Flachdüse ausgebildeten Austrittsdüse 15 richten sich nach Maßgabe des Verhältnisses
wobei
- T=
- Höhe des Austrittsendes
- l=
- axiale Länge der Brennkammer vor dem Flammenhalter
- L=
- axiale Länge der Brennkammer vor dem Flammenhalter plus axiale Länge der Flachdüse
- D=
- Durchmesser der Flachdüse am Eintrittsende
ist (Fig. 1).In the embodiment shown in FIGS. 2 to 5, the housing 1 extends beyond the
in which
- T =
- Exit end height
- l =
- axial length of the combustion chamber in front of the flame holder
- L =
- axial length of the combustion chamber in front of the flame holder plus axial length of the flat nozzle
- D =
- Diameter of the flat nozzle at the inlet end
is (Fig. 1).
Im Bereich der in Strömungsrichtung vor der Flachdüse angeordneten Brennkammer 14 ist im Bereich des Flammenhalters 17 mittig ein Zündgerät 21 angeordnet, zu dem bei der dargestellten Ausführung ein Rohrabschnitt 22 gehört, welcher elektrisch leitend mit Gehäuseteilen verbunden ist. In den Rohrabschnitt 22 ist eine Isolierbuchse 23 eingesetzt, die z. B. aus PTFE bestehen kann. In die Isolierbuchse 23 ist ein Zündkabel 24 eingebettet, dessen freies Ende 25 in eine zur Brennkammer 14 hin offene Kammer des Rohrabschnitts 22 ragt.In the area of the
Die Brenngasdüse 4 besitzt bei der dargestellten Ausführung eine tropfenförmige Gestalt, wobei das schlankere Ende in Strömungsrichtung 5 weist. Das Ende der Brenngasdüse 4 ist in einem Abstand L1 von der Austrittsöffnung 9 der nächsten Mischdüse 6 angeordnet, der dem 1,5- bis 2,5-fachen des Durchmessers D1 dieser Austrittsdüse 9 entspricht.In the embodiment shown, the fuel gas nozzle 4 has a teardrop shape, the slimmer end pointing in the direction of flow 5. The end of the fuel gas nozzle 4 is arranged at a distance L1 from the
Das dargestellte Handschrumpfgerät arbeitet wie folgt: Unter der Injektorwirkung des aus der Brenngasdüse 4 austretenden Brenngases wird in der Mischdüse 6 Luft angesaugt, die sich mit dem Brenngas vermischt. Das Gemisch gelangt über die Austrittsöffnung 9 der Mischdüse 6 in die Mischdüse 7, in der durch Injektorwirkung wiederum Luft angesaugt wird. Gleiches gilt beim Eintritt des dann entstandenen Gemisches in die Venturidüse 8. Durch die Anordnung mehrerer Mischdüsen hintereinander kann die Länge des Handschrumpfgerätes bei gleicher Leistung mit einem vergleichbaren Handschrumpfgerät kürzer gehalten werden. Andererseits besteht aber auch die Möglichkeit, die Leistung seines Handschrumpfgerätes zu verbessern, d. h. mehr Brenngas zuzuführen, welches dann auf kurzem Wege bis zur Brennkammer 14 mit der angesaugten Verbrennungsluft gemischt wird.The hand-held shrinking device shown works as follows: Under the injector action of the fuel gas emerging from the fuel gas nozzle 4, air is sucked into the mixing
Claims (13)
- Hand-held shrinking apparatus, including an injector burner which has an outlet nozzle adapted as flat nozzle (15) and a combustion gas nozzle (4) disposed in a mixing nozzle (6), which tapers inwardly with respect to the direction of flow and draws-in combustion air through its end having the larger cross-section, and a combustion chamber (14), characterised in that a plurality of mixing nozzles (6, 7, 8) are disposed behind one another when viewed with respect to the direction of flow (5), the mixing nozzle (6) which is respectively disposed upstream protruding with its outlet aperture (9) into the inlet end (10) of the mixing nozzle (7) which is respectively disposed downstream, and in that the outlet end of the flat nozzle (15) has dimensions in accordance with the equationT = height of the outlet end;l = axial length of the combustion chamber in front of the flame holder;L = axial length of the combustion chamber in front of the flame holder plus axial length of the flat nozzle; andD = diameter of the flat nozzle at the inlet end.
- Hand-held shrinking apparatus according to claim 1, characterised in that the cross-sections of the outlet apertures (9) of the mixing nozzles (6, 7, 8) increase when viewed with respect to the direction of flow (5).
- Hand-held shrinking apparatus according to claim 1 or 2, characterised in that the mixing nozzle disposed in front of the combustion chamber (14) is a Venturi nozzle (8).
- Hand-held shrinking apparatus according to one of claims 1 to 3, characterised in that the outlet aperture (9) of the Venturi nozzle (8) widens up to the cross-section of the combustion chamber (14).
- Hand-held shrinking apparatus according to one of claims 1 to 4, characterised in that the mixing nozzles (6, 7, 8) are accommodated in a housing (1), which has circumferential air inlet apertures (11) extending to the inlet ends (10) of the mixing nozzles (6, 7, 8).
- Hand-held shrinking apparatus according to claim 5, characterised in that the housing (1) is surrounded by a sound-proofing covering (12) at least in the region of the air inlet apertures (11).
- Hand-held shrinking apparatus according to one of claims 1 to 6, characterised in that the flat nozzle (15) has a wall (18) formed from a material having low thermal conductivity and high heat resistance.
- Hand-held shrinking apparatus according to claim 7, characterised in that the wall (18) of the flat nozzle (15) is formed from ceramic material.
- Hand-held shrinking apparatus according to claim 7 or 8, characterised in that the wall (18) has an internal covering (20) and/or an external covering (19) formed from sheet metal.
- Hand-held shrinking apparatus according to one of claims 7 to 9, characterised in that the flat nozzle (15) is accommodated in a housing portion of the hand-held shrinking apparatus.
- Hand-held shrinking apparatus according to one of claims 7 to 10, characterised in that a turbulence screen (16), a flame holder (17) and an ignition device (21) are disposed in the region of a combustion chamber (14), which is disposed in front of the flat nozzle (15) when viewed with respect to the direction of flow (5), and in that the ignition device (21) comprises a tubular portion (22), which is connected to housing members in an electrically conductive manner, and an ignition cable (24), which is embedded in said tubular portion in an insulated manner, a free end (25) of the ignition cable (24) protruding into the tubular portion (22).
- Hand-held shrinking apparatus according to one of claims 7 to 11, characterised in that the combustion gas nozzle (4) is disposed at a spacing L1 from the outlet aperture (9) of the nearest mixing nozzle (6), which spacing corresponds to 1.5- to 2.5-times the diameter D1 of this outlet aperture (9).
- Hand-held shrinking apparatus according to one of claims 7 to 12, characterised in that the combustion gas nozzle (4) has a teardrop-shaped configuration, the slimmer end pointing in the direction of flow (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT91108658T ATE104230T1 (en) | 1990-06-05 | 1991-05-28 | HAND SHRINK DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9006308U | 1990-06-05 | ||
DE9006308U DE9006308U1 (en) | 1990-06-05 | 1990-06-05 | Hand shrinking device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0460500A2 EP0460500A2 (en) | 1991-12-11 |
EP0460500A3 EP0460500A3 (en) | 1992-04-15 |
EP0460500B1 true EP0460500B1 (en) | 1994-04-13 |
Family
ID=6854393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91108658A Expired - Lifetime EP0460500B1 (en) | 1990-06-05 | 1991-05-28 | Hand shrink apparatus |
Country Status (11)
Country | Link |
---|---|
US (1) | US5156542A (en) |
EP (1) | EP0460500B1 (en) |
JP (1) | JP3112979B2 (en) |
AT (1) | ATE104230T1 (en) |
CZ (1) | CZ279516B6 (en) |
DE (2) | DE9006308U1 (en) |
ES (1) | ES2051048T3 (en) |
HU (1) | HU211011B (en) |
PL (1) | PL166594B1 (en) |
RU (1) | RU2011118C1 (en) |
YU (1) | YU48308B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5649824A (en) * | 1995-02-21 | 1997-07-22 | Stagg; Stanley E. | Portable heating device |
US5975883A (en) * | 1998-01-23 | 1999-11-02 | Gas Research Institute | Method and apparatus for reducing emissions in combustion products |
FR2975168B1 (en) * | 2011-05-13 | 2013-08-16 | Sefmat | HOT AIR GENERATING APPARATUS WITH IMPROVED IGNITION. |
US10184664B2 (en) * | 2014-08-01 | 2019-01-22 | Capstone Turbine Corporation | Fuel injector for high flame speed fuel combustion |
RU191002U1 (en) * | 2018-10-19 | 2019-07-18 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Амурский государственный университет" | Injection gas burner |
CN112013394B (en) * | 2019-05-30 | 2021-08-20 | 宁波方太厨具有限公司 | Injection pipe assembly |
FR3113717B1 (en) * | 2020-08-27 | 2022-08-26 | Sefmat | Gas injection device for a hot air generator |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US569984A (en) * | 1896-10-20 | Virgil w | ||
US329844A (en) * | 1885-11-03 | mulloy | ||
US2063396A (en) * | 1934-09-17 | 1936-12-08 | Homer P Parrigin | Gas fuel burner |
US2117270A (en) * | 1935-06-29 | 1938-05-17 | Fred S Bloom | Apparatus for producing progressively delayed combustion |
US2239025A (en) * | 1939-02-20 | 1941-04-22 | Franco American Patents Ltd | Fuel burner |
US2386978A (en) * | 1941-10-20 | 1945-10-16 | Charles L Ruhl | Gas generating burner |
GB615822A (en) * | 1946-08-12 | 1949-01-12 | Albert Horace Greaves | Improvements in or relating to gas burners |
GB687662A (en) * | 1949-10-05 | 1953-02-18 | Ronald Calvert | Improvements in or relating to gas burners |
US2720257A (en) * | 1952-04-16 | 1955-10-11 | Lynes Roberts Kitchener | Gas burning torches |
US3070317A (en) * | 1958-05-21 | 1962-12-25 | Hunter | Variable rate multiple fuel nozzle |
GB1337121A (en) * | 1970-11-30 | 1973-11-14 | Airoil Burner | Fuel burner assemblies |
BE791005A (en) * | 1971-11-10 | 1973-03-01 | Zagoroff Dimiter S | METHOD AND APPARATUS FOR LOW TEMPERATURE HEATING AND PLASTIC CONTRACTION |
US3940234A (en) * | 1974-05-28 | 1976-02-24 | John Zink Company | Noiseless pms burner |
US3990835A (en) * | 1974-07-26 | 1976-11-09 | Occidental Petroleum Corporation | Burner for igniting oil shale retort |
US3907489A (en) * | 1974-10-03 | 1975-09-23 | Selas Corp Of America | Noise suppressor for burner |
IT1036845B (en) * | 1975-06-11 | 1979-10-30 | Sphirt Snc | FLAME FAN PRTATILE HEATING APPLIANCE |
US4029462A (en) * | 1975-12-10 | 1977-06-14 | National Airoil Burner Co., Inc. | Burner with noise suppressor |
BE841708A (en) * | 1976-05-11 | 1976-11-12 | BURNERS. | |
US4128389A (en) * | 1977-08-22 | 1978-12-05 | Combustion Unlimited Incorporated | Flare stack gas burner |
GB2030280B (en) * | 1977-09-29 | 1982-03-10 | Hadland & Olive Ltd | Heat gun |
GB1599662A (en) * | 1978-05-04 | 1981-10-07 | Quietflo Eng Ltd | Silencing and air control devices for fuel burners |
DE2822192A1 (en) * | 1978-05-20 | 1979-11-22 | Msk Verpackung Syst Gmbh | Manually operated hot-air jet pistol for heat-shrinking plastics films - has piezoelectric igniter coordinated with ergonomically shaped two=part casing and grip |
FR2530317B1 (en) * | 1982-07-15 | 1987-05-29 | Raffinage Cie Francaise | METHOD AND DEVICE FOR THE COMBUSTION OF FUEL GASES WITH ATMOSPHERIC AIR INDUCTION |
FR2615271B1 (en) * | 1987-05-12 | 1990-03-16 | Stepack | GAS BURNER, COLD NOZZLE TYPE |
-
1990
- 1990-06-05 DE DE9006308U patent/DE9006308U1/en not_active Expired - Lifetime
-
1991
- 1991-05-28 AT AT91108658T patent/ATE104230T1/en not_active IP Right Cessation
- 1991-05-28 ES ES91108658T patent/ES2051048T3/en not_active Expired - Lifetime
- 1991-05-28 DE DE59101353T patent/DE59101353D1/en not_active Expired - Lifetime
- 1991-05-28 EP EP91108658A patent/EP0460500B1/en not_active Expired - Lifetime
- 1991-05-29 YU YU95691A patent/YU48308B/en unknown
- 1991-06-03 HU HU911847A patent/HU211011B/en not_active IP Right Cessation
- 1991-06-04 RU SU914895565A patent/RU2011118C1/en active
- 1991-06-04 JP JP03131543A patent/JP3112979B2/en not_active Expired - Lifetime
- 1991-06-04 CZ CS911687A patent/CZ279516B6/en not_active IP Right Cessation
- 1991-06-04 PL PL91290534A patent/PL166594B1/en unknown
- 1991-06-05 US US07/710,810 patent/US5156542A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2051048T3 (en) | 1994-06-01 |
YU48308B (en) | 1998-05-15 |
ATE104230T1 (en) | 1994-04-15 |
RU2011118C1 (en) | 1994-04-15 |
JPH05132038A (en) | 1993-05-28 |
HU211011B (en) | 1995-09-28 |
US5156542A (en) | 1992-10-20 |
DE9006308U1 (en) | 1990-08-09 |
EP0460500A2 (en) | 1991-12-11 |
CZ279516B6 (en) | 1995-05-17 |
CS168791A3 (en) | 1992-02-19 |
PL166594B1 (en) | 1995-06-30 |
JP3112979B2 (en) | 2000-11-27 |
HU911847D0 (en) | 1991-12-30 |
DE59101353D1 (en) | 1994-05-19 |
YU95691A (en) | 1995-03-27 |
EP0460500A3 (en) | 1992-04-15 |
HUT59474A (en) | 1992-05-28 |
PL290534A1 (en) | 1992-02-10 |
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