EP1389403A1 - Element de chauffage - Google Patents

Element de chauffage

Info

Publication number
EP1389403A1
EP1389403A1 EP02730260A EP02730260A EP1389403A1 EP 1389403 A1 EP1389403 A1 EP 1389403A1 EP 02730260 A EP02730260 A EP 02730260A EP 02730260 A EP02730260 A EP 02730260A EP 1389403 A1 EP1389403 A1 EP 1389403A1
Authority
EP
European Patent Office
Prior art keywords
heating coil
heating element
tube
element according
heating
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.)
Withdrawn
Application number
EP02730260A
Other languages
German (de)
English (en)
Inventor
Michael Hoffmann
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.)
Watlow GmbH
Original Assignee
Watlow GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Watlow GmbH filed Critical Watlow GmbH
Publication of EP1389403A1 publication Critical patent/EP1389403A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material

Definitions

  • the invention relates to a heating element with a reflector tube, in which a heating coil having at least one resistance wire is arranged essentially coaxially, the heating coil being connectable to a power source via end connections and fastened in at least one holding section to the inner wall of the reflector tube.
  • a spray nozzle in plastics processing being assumed as an example below.
  • a sleeve-shaped heating element with an inner heating coil which is fastened to the inner wall of an outer reflector tube is pushed onto the outside of the nozzle.
  • the heating coil consists of a coiled jacket tube, which is usually made of stainless steel and in which one or more resistance wires are arranged along the entire length.
  • the resistance wires can be turned or straight. Lead wires are arranged at both ends of the resistance wire.
  • a heating coil with a connection outlet on both sides in which the connections of the resistance wire lie at opposite ends of the heating coil, the resistance wire is guided in one layer through the jacket tube.
  • the resistance wire is passed through the jacket tube in two layers or bifilar, or the jacket tube itself is wound in a double layer, with a bend at its end facing away from the connectors experienced by 180 °.
  • the resistance wires are embedded in a filler inside the jacket tube in order to achieve precise positioning and to avoid mutual contact.
  • the heating coil In order to achieve good heat transfer from the heating coil to the spray nozzle, the heating coil should lie tightly against the surface of the pointed nozzle. For this reason, it is known to slit the reflector tube in the longitudinal direction and on the outside with a clamping screw
  • the invention has for its object to provide a heating element of the type mentioned, which takes up little space and is easy to assemble on a nozzle.
  • the heating coil is free between the holding section in which it is fastened to the inner wall of the reflector tube and at least one axial end thereof, i.e. can be rotated without further attachment to the reflector tube and relative to it, and sits in the reflector tube with radial play and can be expanded radially by applying a torsional moment.
  • Game between the heating coil and the inner wall of the reflector tube and the at least partially free movement of the heating coil relative to the reflector tube make it possible to radially expand the heating coil in order to push it onto a nozzle without the reflector tube having to be slotted.
  • the expansion of the heating coil is made by manual application of a torsional moment, the fastening of the heating coil ensures on the inner wall of the Re ⁇ flektorrohres that the applied torsional - moment does not result in rotation of the heating coil, but to their expansion.
  • the heating coil After the heating coil is widened and pushed axially onto the nozzle, the application of the torsional moment is terminated, as a result of which the heating coil returns to its starting position and stretches radially from the outside onto the nozzle.
  • the resulting, radially inward spring force of the heating coil is dimensioned such that it also when the heating coil is heated and thus associated thermal expansions ensures that the heating coil contacts the nozzle.
  • the contact of the heating coil on the outer surface of the nozzle is achieved by the resilient restoring force of the heating coil, so that there is no need for an external clamping device and the heating element requires only a small installation space.
  • the heating coil is attached to the reflector tube in only a single holding section.
  • This holding section can be arranged, for example, in the central region of the heating coil, so that the two opposite axial sections of the heating coil pointing to different sides can be expanded independently of one another by applying a torsional moment to the respective end of the heating coil.
  • the holding section is arranged on or near only one axial end of the heating coil, so that a uniform radial expansion of the heating coil can be achieved over its entire length by applying a torsional moment, in particular at the other end of the heating coil. In this way, ei ⁇ ne simple operation of the heating element is ensured.
  • the resilience of the heating coil can be achieved on the one hand by the fact that the casing tube surrounding the contra-wire consists of a resilient material and in particular of a spring steel. Alternatively or additionally, it can be provided that a screw spring is integrated, which preferably also consists of a spring steel.
  • the helical spring runs essentially parallel to the casing tube and is coiled with it in a similar manner.
  • the helical spring is preferably fastened together with the casing tube in the same section to the inner wall of the reflector tube, the attachment being able to be achieved by an adhesive or welded connection.
  • the coil spring should be attached to the jacket tube at least in sections and in particular be welded on. This attachment ensures that the heating coil and the coil spring can only be expanded together and accordingly experience a common restoring force.
  • the heating coil is turned bifilar to form a one-sided outlet of the connections, i.e. from the end having the connections runs helically to the opposite end, there undergoes a 180 ° bend and runs helically back to the starting point, the two layers of the heating coil running parallel to one another.
  • a good and reliable attachment of the coil spring to the heating coil can be achieved if the coil spring is arranged between the two layers of the heating coil or the jacket tube and is attached to both layers.
  • the heating coil is attached at its end opposite the outlet end of the connections to the inner wall of the reflector tube. Applying a torsional moment to the outlet-side end of the connections thus leads to a radial expansion of the heating coil up to the fastening section, ie over almost its entire length.
  • the torsional moment required to expand the heating coil can be applied particularly easily by a user if the connections pass through the reflector tube at a recess running in the circumferential direction of the reflector tube. The user therefore only has to grasp the connections and move them along the recess in the circumferential direction of the reflector tube, which leads to the application of a torsional moment to the heating coil.
  • the recess on the one hand restricts the movement of the connections and prevents excessive deformation of the heating coil, on the other hand the recess also serves as a guide both when the heating coil is expanded and when it is resiliently reset.
  • FIG. 1 shows a longitudinal section through a heating element according to the invention in the starting position
  • FIG. 2 shows the heating element according to FIG. 1 in a position placed on a nozzle
  • FIG. 3 shows an external view of the heating element according to FIG. 1.
  • a heating element 10 shown in FIGS. 1 to 3 has a reflector tube 11, in the interior of which a heating coil 12 is arranged essentially coaxially.
  • the central longitudinal axis of the heating coil 12 essentially coincides with the central longitudinal axis of the reflector tube 11.
  • the heating coil 12 consists of a jacket tube 13, inside which a resistance wire 19 runs.
  • the jacket tube 13 is double-layered or bifilar, i.e. starting from a first axial end 12a of the heating coil 12 with a first end connection 15, the casing tube 13 extends in a coil section 13a to the opposite second axial end 12b of the heating coil 12, undergoes a 180 ° bend there and is in a second coil section 13b in similar spiral shape parallel to the first spiral section 13a to the exit area, ie the first axial end 12a of the heating coil 12, is returned and forms a second connection 16 there.
  • a helical spring 14 is inserted in a similar manner, which is connected to the outlet-side end of the connections 15 and 16 via a welded joint 17 two layers of the casing tube 13, ie is fastened to both spiral sections 13a and 13b.
  • the jacket tube 13 is fastened together with the coil spring 14 in a holding section 20 via a welded connection 18 to the inner wall 11a of the reflector tube 11.
  • connections 15 and 16 pass through the reflector tube 11 at a recess 11b running in the circumferential direction of the reflector tube 11, so that the connections 15 and 16 protrude on the outside and from a user relative to the Reflector tube 11 can be moved in its U direction, which leads to a torsional moment in the jacket tube 13 and the coil spring 14. Since the casing tube 13 is fastened together with the helical spring 14 at the end 12b of the heating coil 12 opposite the connections 15 and 16 via the welded connection 18 to the inner wall 11a of the reflector tube 11, the torsional moment leads to a radial expansion of the heating coil 12, which leads to this Purpose with radial play in the reflector tube 11.
  • the heating coil 12 After the user has radially expanded the heating coil 12, it can be pushed axially onto a nozzle D (see FIG. 2). When the user then releases the connections 15 and 16, the heating coil 12 returns from its radially widened position due to the spring action of the casing tube 13 and the coil spring 14 and in the process stretches radially from the outside onto the nozzle D, so that there is close contact between the jacket tube 13 and the outside of the nozzle D and thus a good heat transfer is ensured. This state is shown in Fig. 2.
  • the jacket tube has a circular cross section in the exemplary embodiment shown, other cross-sectional shapes, in particular a rectangular cross section, can also be used in order to achieve the largest possible contact area between the inside of the jacket tube and the outside surface of the nozzle D.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Heating (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un élément de chauffage comprenant un tube réflecteur extérieur, dans lequel un filament de chauffage, pourvu d'au moins un fil de résistance, est agencé de façon sensiblement coaxiale. Ce filament de chauffage, qui peut être raccordé à une source de courant par l'intermédiaire de raccords côté extrémité, est fixé à la paroi intérieure du tube réflecteur dans au moins une section de retenue. Selon la présente invention, ce filament de chauffage peut se déplacer librement entre ladite section de maintien et au moins sa première extrémité axiale, est placé dans le tube réflecteur avec un jeu radial et peut être élargi radialement par l'application d'un moment de torsion. Un tube de protection, enveloppant le fil de résistance, peut être constitué dans un matériau élastique, en particulier un acier à ressort, et/ou un ressort hélicoïdal en acier à ressort peut être intégré dans le filament de chauffage.
EP02730260A 2001-05-21 2002-05-16 Element de chauffage Withdrawn EP1389403A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001124960 DE10124960A1 (de) 2001-05-21 2001-05-21 Heizelement
DE10124960 2001-05-21
PCT/EP2002/005399 WO2002096156A1 (fr) 2001-05-21 2002-05-16 Element de chauffage

Publications (1)

Publication Number Publication Date
EP1389403A1 true EP1389403A1 (fr) 2004-02-18

Family

ID=7685751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02730260A Withdrawn EP1389403A1 (fr) 2001-05-21 2002-05-16 Element de chauffage

Country Status (3)

Country Link
EP (1) EP1389403A1 (fr)
DE (1) DE10124960A1 (fr)
WO (1) WO2002096156A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007542B4 (de) * 2004-02-15 2007-03-22 Gc-Heat Gebhard & Castiglia Gmbh & Co. Kg Elektrischer Heizkörper in Form eines verdichteten Heizelementes mit dauerhaften Federeigenschaften
EP1819201B1 (fr) * 2006-02-08 2008-08-20 Hotset Heizpatronen u. Zubehör GmbH Dispositif de chauffage de pièces cylindriques
DE202008015979U1 (de) 2008-12-03 2010-05-06 Türk & Hillinger GmbH Rohrförmiges Heizelement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2022124A1 (fr) * 1990-07-27 1992-01-28 Jobst Ulrich Gellert Base d'injection isolee
DE19502327A1 (de) * 1994-03-16 1995-09-21 Hotset Heizpatronen Zubehoer Elektrisch beheizbarer zylindrischer Körper
DE19535472A1 (de) * 1995-09-23 1997-03-27 Tuerk & Hillinger Gmbh Elektrischer Ringheizkörper
DE19538205C1 (de) * 1995-10-13 1997-02-13 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement
DE19746311C2 (de) * 1997-10-21 2000-05-31 Hotset Heizpatronen Zubehoer Elektrische Heizpatrone
DE19746556A1 (de) * 1997-10-22 1999-05-06 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement zur Beheizung eines Düsenkörpers
DE19943192A1 (de) * 1999-09-09 2001-04-05 Hotset Heizpatronen Zubehoer Rohrförmiges Heizelement
DE29918251U1 (de) * 1999-10-18 1999-12-23 Otto Maenner Vertriebs Gmbh Fa Heißkanaldüse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02096156A1 *

Also Published As

Publication number Publication date
WO2002096156A1 (fr) 2002-11-28
DE10124960A1 (de) 2002-11-28

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