EP0460500A2 - Hand shrink apparatus - Google Patents

Hand shrink apparatus Download PDF

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Publication number
EP0460500A2
EP0460500A2 EP91108658A EP91108658A EP0460500A2 EP 0460500 A2 EP0460500 A2 EP 0460500A2 EP 91108658 A EP91108658 A EP 91108658A EP 91108658 A EP91108658 A EP 91108658A EP 0460500 A2 EP0460500 A2 EP 0460500A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
hand
shrinking device
mixing
combustion chamber
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.)
Granted
Application number
EP91108658A
Other languages
German (de)
French (fr)
Other versions
EP0460500A3 (en
EP0460500B1 (en
Inventor
Reiner Hannen
Robert Habegger
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.)
MSK Verpackungs Systeme GmbH
Original Assignee
Develog Reiner Hannen and Cie
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 Develog Reiner Hannen and Cie filed Critical Develog Reiner Hannen and Cie
Priority to AT91108658T priority Critical patent/ATE104230T1/en
Publication of EP0460500A2 publication Critical patent/EP0460500A2/en
Publication of EP0460500A3 publication Critical patent/EP0460500A3/en
Application granted granted Critical
Publication of EP0460500B1 publication Critical patent/EP0460500B1/en
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Classifications

    • 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 a fuel gas nozzle which is arranged in a mixing nozzle which tapers in the direction of flow and which draws in combustion air through its end with the 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, the hand shrinking device is supplied with fuel gas which is mixed in the mixing chamber with combustion air. 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 appropriately large be. so that its manageability 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.
  • This object is achieved in that a plurality of mixing nozzles are arranged one behind the other in the direction of flow, the mixing nozzle arranged upstream in each case projecting with its outlet opening into the suction end of the mixing nozzle arranged downstream.
  • 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 z. B. 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.
  • a housing which has air inlet openings on the circumference, which lead to the suction ends of the mixing nozzles.
  • 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 pipe section connecting housing parts and an insulated ignition cable embedded therein and a free end of the ignition cable protrudes into the pipe section.
  • 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 flow direction, the arrangement of the fuel gas nozzle also being particularly important.
  • the invention recommends placing 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 surrounds, for example, a stack of goods.
  • the basic structure of the hand-held 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 protrude 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 circumferential air inlet openings which 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 illustrated embodiment 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 effect 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gas Burners (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Vehicle Body Suspensions (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Manipulator (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Nozzles (AREA)

Abstract

The invention relates to a hand-held shrinking apparatus which comprises an injector-type burner with a combustible gas nozzle (4) arranged in a mixing nozzle which tapers in the direction of flow and sucks combustion air in through its end having the larger cross-section, and a combustion chamber. To improve the performance of a hand-held shrinking apparatus and make it easier to handle, a number of mixing nozzles (6, 7, 8) are to be arranged one behind the other in the direction of flow, the outlet orifice of the mixing nozzle arranged upstream in each case projecting into the intake end of the mixing nozzle arranged downstream in each case. <IMAGE>

Description

Die Erfindung betrifft ein Handschrumpfgerät mit einem Injektorbrenner, der eine Brenngasdüe aufweist, die in einer sich in Strömungsrichtung verjüngenden Mischdüse angeordnet 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 a fuel gas nozzle which is arranged in a mixing nozzle which tapers in the direction of flow and which draws in combustion air through its end with the 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 bekannten Handschrumpfgeräten 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, the hand shrinking device is supplied with fuel gas which is mixed in the mixing chamber with combustion air. 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 known hand shrinking devices, 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 appropriately large be. so that its manageability 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. Durch die Hintereinanderschaltung mehrer 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.This object is achieved in that a plurality of mixing nozzles are arranged one behind the other in the direction of flow, the mixing nozzle arranged upstream in each case projecting with its outlet opening into the suction end of the mixing nozzle arranged downstream. 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 can also be designed for a 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-shrink device remain within reasonable limits.

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 z. B. 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. There In such a hand shrinking device considerable suction and / or mixing noises can occur, 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.

Bei einer bevorzugten Ausführung der Erfindung weist das Austrittsende der Flachdüse Abmessungen nach Maßgabe des Verhältnisses

Figure imgb0001

auf, 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. Damit soll eine vollständige Verbrennung im Bereich von Brennkammer und Austrittsdüse erreicht und sichergestellt werden, daß keine Flammen aus der Austrittsdüse austreten.In a preferred embodiment of the invention, the outlet end of the flat nozzle has dimensions in accordance with the ratio
Figure imgb0001
on, where
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. This is intended to achieve complete combustion in the area of the combustion chamber and outlet nozzle and to ensure that no flames emerge from the outlet nozzle.

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 verbundenden Rohrabschnitt sowie einem darin isoliert 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 pipe section connecting housing parts and an insulated ignition cable embedded therein and a free end of the ignition cable protrudes into the pipe section. It goes without saying 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 2,5-fachen 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 flow direction, the arrangement of the fuel gas nozzle also being particularly important. Here, the invention recommends placing 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.
In the following an embodiment of the invention shown in the drawing is explained; show it:
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 surrounds, for example, a stack of goods. The basic structure of the hand-held 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 mixing nozzles 6, 7 and a Venturi nozzle 8 are arranged behind the fuel gas nozzle. The respective upstream mixing nozzles 6 protrude 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.

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 outlet openings 9 of the successive nozzles increase in the flow direction 5. The housing 1 has circumferential air inlet openings which 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.

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 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.

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

Figure imgb0002


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 outlet nozzle 15 designed as a flat nozzle, so that this outlet nozzle 15 is embedded in a housing section. The outlet nozzle 15 has a wall 18 made of ceramic, which is covered on the outside by an outer jacket 19 made of sheet metal and on the inside by an inner jacket 20 made of sheet metal. The dimensions of the outlet nozzle 15 designed as a flat nozzle depend on the ratio

Figure imgb0002

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 combustion chamber 14 arranged in the flow direction in front of the flat nozzle, an ignition device 21 is arranged in the center in the area of the flame holder 17, which in the illustrated embodiment includes a pipe section 22 which is connected to housing parts in an electrically conductive manner. In the pipe section 22, an insulating bush 23 is used, the z. B. can consist of PTFE. In the insulating sleeve 23, 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.

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 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.

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 effect 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. By arranging several mixing nozzles one behind the other, the length of the hand shrinking device can be kept shorter with a comparable hand shrinking device with the same performance. On the other hand, there is also the possibility to improve the performance of his hand shrinking device. H. to supply more fuel gas, which is then mixed up to the combustion chamber 14 with the intake of combustion air.

Claims (14)

Handschrumpfgerät mit einem Injektorbrenner, der eine Brenngasdüse aufweist, die in einer sich in Stömungsrichtung verjüngende Mischdüse angeordnet ist, die durch ihr Ende mit dem größeren Querschnitt Verbrennungsluft ansaugt, und mit einer Brennkammer, dadurch gekennzeichnet, daß in Strömungsrichtung (5) hintereinander mehrere Mischdüsen (6, 7, 8) angeordnet sind, wobei die jeweils Stromaufwärts angeordnete Mischdüse (6) mit ihrer Austrittsmündung (9) in das Ansaugende (10) der jeweils stromabwärts angeordneten Mischdüse (7) ragt.Hand-held shrinking device with an injector burner, which has a fuel gas nozzle which is arranged in a mixing nozzle which tapers in the direction of flow and which draws in combustion air through its larger cross-section, and with a combustion chamber, characterized in that a plurality of mixing nozzles in succession in the direction of flow (5) 6, 7, 8) are arranged, the upstream mixing nozzle (6) with its outlet mouth (9) protruding into the suction end (10) of the downstream mixing nozzle (7). Handschrumpfgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnitte der Austrittsmündungen (9) der Mischdüsen (6, 7, 8) in Strömungsrichtung (5) zunehmen.Hand shrinking device according to claim 1, characterized in that the cross sections of the outlet openings (9) of the mixing nozzles (6, 7, 8) increase in the direction of flow (5). Handschrumpfgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die vor der Brennkammer (14) angeordnete Mischdüse eine Venturidüse (8) ist.Hand shrinking device according to claim 1 or 2, characterized in that the mixing nozzle arranged in front of the combustion chamber (14) is a Venturi nozzle (8). Handschrumpfgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Austrittsmündung (10) der Venturidüse (8) sich bis auf den Querschnitt der Brennkammer (14) erweitert.Hand shrinking device according to one of claims 1 to 3, characterized in that the outlet mouth (10) of the Venturi nozzle (8) extends to the cross section of the combustion chamber (14). Handschrumpfgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Mischdüsen (6, 7, 8) in einem Gehäuse (1) untergebracht sind, welche umfangsseitige Lufteintrittsöffnungen (11) aufweist, die zu den Ansaugenden (10) der Mischdüsen (6, 7, 8) führen.Hand-held shrinking device according to one of claims 1 to 4, characterized in that the mixing nozzles (6, 7, 8) are accommodated in a housing (1) which has peripheral air inlet openings (11) which lead to the suction ends (10) of the mixing nozzles (6 , 7, 8) lead. Handschrumpfgerät nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Gehäuse (1) wenigstens im Bereich der Lufteintrittsöffnungen (11) von einem Schallschutzmantel (12) umgeben ist.Manual shrinking device according to one of claims 1 to 5, characterized in that the housing (1) is surrounded by a soundproofing jacket (12) at least in the area of the air inlet openings (11). Handschrumpfgerät nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Flachdüse (15) eine Wandung (18) aus einem Material mit geringer Temperaturleitfähigkeit und großer Hitzebeständigkeit aufweist.Hand shrinking device according to one of claims 1 to 6, characterized in that the flat nozzle (15) has a wall (18) made of a material with low thermal conductivity and high heat resistance. Handschrumpfgerät nach Anspruch 7, dadurch gekennzeichnet, daß die Wandung (18) der Flachdüse (15) aus Keramik besteht.Hand shrinking device according to claim 7, characterized in that the wall (18) of the flat nozzle (15) consists of ceramic. Handschrumpfgerät nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Wandung (18) einen Innenmantel (20) und/oder einen Außenmantel (19) aus Blech aufweist.Hand shrinking device according to claim 7 or 8, characterized in that the wall (18) has an inner jacket (20) and / or an outer jacket (19) made of sheet metal. Handschrumpfgerät nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die Flachdüse (15) in einem Gehäuseabschnitt des Handschrumpfgerätes untergebracht ist.Hand shrinking device according to one of claims 7 to 9, characterized in that the flat nozzle (15) is accommodated in a housing section of the hand shrinking device. Handschrumpfgerät nach einem der Ansprüche 7 bis 10. dadurch gekennzeichnet, daß das Austrittsende der Flachdüse (15) Abmessungen nach Maßgabe des Verhältnisses

Figure imgb0003

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.Hand shrinking device according to one of claims 7 to 10, characterized in that the outlet end of the flat nozzle (15) dimensions in accordance with the ratio

Figure imgb0003

has, wherein T = height of the exit 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 D = diameter of the flat nozzle at the inlet end is. Handschrumpfgerät nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß im Bereich einer in Strömungsrichtung (5) vor der Flachdüse (15) angeordneten Brennkammer (14) ein Turbulenzgitter (16), ein Flammenhalter (17) sowie ein Zündgerät (21) angeordnet sind, und daß das Zündgerät (21) aus einem elektrisch leitend mit Gehäuseteilen verbundenden Rohrabschnitt (22) sowie einen darin isoliert eingebetteten Zündkabel (24) besteht. wobei ein freies Ende (25) des Zündkabels (24) in den Rohrabschnitt (22) ragt.Hand-held shrink device according to one of claims 7 to 10, characterized in that a turbulence grille (16), a flame holder (17) and an ignition device (21) are arranged in the region of a combustion chamber (14) arranged in the flow direction (5) in front of the flat nozzle (15) are, and that the igniter (21) consists of an electrically conductive pipe section (22) connecting housing parts and an insulated ignition cable (24) embedded therein. a free end (25) of the ignition cable (24) in protrudes the pipe section (22). Handschrumpfgerät nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, daß die Brenngasdüse (4) in einem Abstand L1 von der Austrittsöffnung (9) der nächsten Mischdüse (6) angeordnet ist, der dem 1,5-bis 2,5-fachen des Durchmessers D1 dieser Austrittsdüse (9) entspricht.Hand shrinking device according to one of claims 7 to 12, characterized in that the fuel gas nozzle (4) is arranged at a distance L1 from the outlet opening (9) of the next mixing nozzle (6) which is 1.5 to 2.5 times the Diameter D1 corresponds to this outlet nozzle (9). Handschrumpfgerät nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, daß die Brenngasdüse (4) eine tropfenförmige Gestalt aufweist, wobei das schlankere Ende in Strömungsrichtung (5) weist.Hand shrinking device according to one of claims 7 to 13, characterized in that the fuel gas nozzle (4) has a teardrop shape, the slimmer end pointing in the direction of flow (5).
EP91108658A 1990-06-05 1991-05-28 Hand shrink apparatus Expired - Lifetime EP0460500B1 (en)

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 DE9006308U1 (en) 1990-06-05 1990-06-05 Hand shrinking device
DE9006308U 1990-06-05

Publications (3)

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EP0460500A2 true EP0460500A2 (en) 1991-12-11
EP0460500A3 EP0460500A3 (en) 1992-04-15
EP0460500B1 EP0460500B1 (en) 1994-04-13

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ID=6854393

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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)

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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

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Also Published As

Publication number Publication date
ATE104230T1 (en) 1994-04-15
HUT59474A (en) 1992-05-28
YU95691A (en) 1995-03-27
YU48308B (en) 1998-05-15
PL166594B1 (en) 1995-06-30
JPH05132038A (en) 1993-05-28
HU911847D0 (en) 1991-12-30
EP0460500A3 (en) 1992-04-15
CZ279516B6 (en) 1995-05-17
PL290534A1 (en) 1992-02-10
RU2011118C1 (en) 1994-04-15
US5156542A (en) 1992-10-20
ES2051048T3 (en) 1994-06-01
JP3112979B2 (en) 2000-11-27
HU211011B (en) 1995-09-28
DE9006308U1 (en) 1990-08-09
EP0460500B1 (en) 1994-04-13
CS168791A3 (en) 1992-02-19
DE59101353D1 (en) 1994-05-19

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