EP0460500B1 - Appareil de thermo-rétraction à main - Google Patents

Appareil de thermo-rétraction à main Download PDF

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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
Authority
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
Application number
EP91108658A
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German (de)
English (en)
Other versions
EP0460500A3 (en
EP0460500A2 (fr
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/de
Publication of EP0460500A2 publication Critical patent/EP0460500A2/fr
Publication of EP0460500A3 publication Critical patent/EP0460500A3/de
Application granted granted Critical
Publication of EP0460500B1 publication Critical patent/EP0460500B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 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.

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)
  • Nozzles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Claims (13)

  1. Appareil à main de rétraction par voie thermique comprenant un brûleur formant injecteur qui comporte une tuyère de sortie réalisée sous la forme d'une tuyère plate (15) et une buse à gaz combustible (4) disposée dans une tuyère mélangeuse (6) qui se rétrécit dans la direction de l'écoulement et qui aspire de l'air de combustion par son extrémité dont la section transversale est la plus grande, et comprenant une chambre de combustion (14), caractérisé par le fait que plusieurs tuyères mélangeuses (6, 7, 8) sont disposées les unes derrière les autres dans la direction (5) de l'écoulement, la tuyère mélangeuse (6) qui est à chaque fois disposée en amont faisant saillie par son embouchure de sortie (9) dans l'extrémité d'aspiration (10) de la tuyère mélangeuse (7) qui est à chaque fois disposée en aval, et par le fait que l'extrémité de sortie de la tuyère plate (15) présente des dimensions qui vérifient la relation : T/l = L/D
    Figure imgb0005
     où:
    T =   hauteur de l'extrémité de sortie,
    l =   longueur axiale de la chambre de combustion avant l'accrocheur de flamme,
    L =   longueur axiale de la chambre de combustion avant l'accrocheur de flamme, augmentée de la longueur axiale de la tuyère plate,
    D =   diamètre de la tuyère plate à l'extrémité d'entrée.
  2. Appareil à main de rétraction par voie thermique selon la revendication 1, caractérisé par le fait que les sections transversales des ouvertures de sortie (9) des tuyères mélangeuses (6, 7, 8) augmentent dans la direction (5) de l'écoulement.
  3. Appareil à main de rétraction par voie thermique selon la revendication 1 ou 2, caractérisé par le fait que la tuyère mélangeuse qui est disposée avant la chambre de combustion (14) est une tuyère convergente-divergente (8).
  4. Appareil à main de rétraction par voie thermique selon l'une des revendications 1 à 3, caractérisé par le fait que l'embouchure de sortie (9) de la tuyère convergente-divergente (8) s'élargit jusqu'à présenter la section transversale de la chambre de combustion (14).
  5. Appareil à main de rétraction par voie thermique selon l'une des revendications 1 à 4, caractérisé par le fait que les tuyères mélangeuses (6, 7, 8) sont logées dans un boîtier (1) comportant des ouvertures d'entrée de l'air (11) qui sont situées du côté de son pourtour et qui conduisent aux extrémités d'aspiration (10) des tuyères mélangeuses (6, 7, 8).
  6. Appareil à main de rétraction par voie thermique selon la revendication 5, caractérisé par le fait que le boîtier (1) est entouré par une enveloppe d'insonorisation (12), du moins dans la région des ouvertures d'entrée de l'air (11).
  7. Appareil à main de rétraction par voie thermique selon l'une des revendications 1 à 6, caractérisé par le fait que la tuyère plate (15) comporte une paroi (18) en un matériau à faible conductibilité thermique et à forte résistance à la chaleur.
  8. Appareil à main de rétraction par voie thermique selon la revendication 7, caractérisé par le fait que la paroi (18) de la tuyère plate (15) est en céramique.
  9. Appareil à main de rétraction par voie thermique selon la revendication 7 ou 8, caractérisé par le fait que la paroi (18) comporte une enveloppe intérieure (20) et/ou une enveloppe extérieure (19) en tôle.
  10. Appareil à main de rétraction par voie thermique selon l'une des revendications 7 à 9, caractérisé par le fait que la tuyère plate (15) est logée dans une partie du boîtier de l'appareil à main de rétraction par voie thermique.
  11. Appareil à main de rétraction par voie thermique selon l'une des revendications 7 à 10, caractérisé par le fait qu'une grille de turbulence (16), un accrocheur de flamme (17) et un appareil d'allumage (21) sont disposés dans la région d'une chambre de combustion (14) disposée avant la tuyère plate (15) dans la direction (5) de l'écoulement, et par le fait que l'appareil d'allumage (21) est constitué par une partie tubulaire (22) qui est reliée à des parties du boîtier d'une manière conductrice de l'électricité, ainsi que par un câble d'allumage (24) qui est logé dans celle-ci d'une manière isolée, une extrémité libre (25) du câble d'allumage (24) faisant saillie dans la partie tubulaire (22).
  12. Appareil à main de rétraction par voie thermique selon l'une des revendications 7 à 11, caractérisé par le fait que la buse à gaz combustible (4) est disposée par rapport à l'ouverture de sortie (9) de la tuyère mélangeuse suivante (6) à une distance L1 qui est comprise entre 1,5 et 2,5 fois le diamètre D1 de cette ouverture de sortie (9).
  13. Appareil à main de rétraction par voie thermique selon l'une des revendications 7 à 12, caractérisé par le fait que la buse à gaz combustible (4) présente la forme d'une goutte, l'extrémité la plus effilée étant dirigée dans la direction (5) de l'écoulement.
EP91108658A 1990-06-05 1991-05-28 Appareil de thermo-rétraction à main Expired - Lifetime EP0460500B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91108658T ATE104230T1 (de) 1990-06-05 1991-05-28 Handschrumpfgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9006308U DE9006308U1 (de) 1990-06-05 1990-06-05 Handschrumpfgerät
DE9006308U 1990-06-05

Publications (3)

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

Family

ID=6854393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108658A Expired - Lifetime EP0460500B1 (fr) 1990-06-05 1991-05-28 Appareil de thermo-rétraction à main

Country Status (11)

Country Link
US (1) US5156542A (fr)
EP (1) EP0460500B1 (fr)
JP (1) JP3112979B2 (fr)
AT (1) ATE104230T1 (fr)
CZ (1) CZ279516B6 (fr)
DE (2) DE9006308U1 (fr)
ES (1) ES2051048T3 (fr)
HU (1) HU211011B (fr)
PL (1) PL166594B1 (fr)
RU (1) RU2011118C1 (fr)
YU (1) YU48308B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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 (fr) * 2011-05-13 2013-08-16 Sefmat Appareil generateur d'air chaud a allumage ameliore.
US10184664B2 (en) * 2014-08-01 2019-01-22 Capstone Turbine Corporation Fuel injector for high flame speed fuel combustion
RU191002U1 (ru) * 2018-10-19 2019-07-18 Федеральное государственное бюджетное образовательное учреждение высшего образования "Амурский государственный университет" Инжекторная газовая горелка
CN112013394B (zh) * 2019-05-30 2021-08-20 宁波方太厨具有限公司 引射管组件
FR3113717B1 (fr) * 2020-08-27 2022-08-26 Sefmat Dispositif d’injection de gaz pour un générateur d’air chaud

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US569984A (en) * 1896-10-20 Virgil w
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US2063396A (en) * 1934-09-17 1936-12-08 Homer P Parrigin Gas fuel burner
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GB615822A (en) * 1946-08-12 1949-01-12 Albert Horace Greaves Improvements in or relating to gas burners
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Also Published As

Publication number Publication date
PL166594B1 (pl) 1995-06-30
EP0460500A3 (en) 1992-04-15
CZ279516B6 (cs) 1995-05-17
DE9006308U1 (de) 1990-08-09
ES2051048T3 (es) 1994-06-01
HU911847D0 (en) 1991-12-30
DE59101353D1 (de) 1994-05-19
ATE104230T1 (de) 1994-04-15
PL290534A1 (en) 1992-02-10
US5156542A (en) 1992-10-20
EP0460500A2 (fr) 1991-12-11
JPH05132038A (ja) 1993-05-28
YU95691A (sh) 1995-03-27
HUT59474A (en) 1992-05-28
RU2011118C1 (ru) 1994-04-15
CS168791A3 (en) 1992-02-19
JP3112979B2 (ja) 2000-11-27
YU48308B (sh) 1998-05-15
HU211011B (en) 1995-09-28

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