EP0432192B1 - Parallel-heizband - Google Patents

Parallel-heizband Download PDF

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Publication number
EP0432192B1
EP0432192B1 EP89909703A EP89909703A EP0432192B1 EP 0432192 B1 EP0432192 B1 EP 0432192B1 EP 89909703 A EP89909703 A EP 89909703A EP 89909703 A EP89909703 A EP 89909703A EP 0432192 B1 EP0432192 B1 EP 0432192B1
Authority
EP
European Patent Office
Prior art keywords
compensating element
heater according
strip heater
parallel strip
parallel
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
EP89909703A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0432192A1 (de
Inventor
Lothar LAMSHÖFT
Claus Bodenbender
Bernd Winkler
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.)
MONETTE KABEL- und ELEKTROWERK GmbH
Original Assignee
MONETTE KABEL- und ELEKTROWERK 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 MONETTE KABEL- und ELEKTROWERK GmbH filed Critical MONETTE KABEL- und ELEKTROWERK GmbH
Priority to AT89909703T priority Critical patent/ATE85742T1/de
Publication of EP0432192A1 publication Critical patent/EP0432192A1/de
Application granted granted Critical
Publication of EP0432192B1 publication Critical patent/EP0432192B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables

Definitions

  • the invention relates to a parallel heating tape according to the preamble of claim 1.
  • Such a parallel heating tape is basically already known from US Pat. No. 3,757,086.
  • the individual insulation of the connection conductors is bridged at predetermined points in that an electrically conductive contact bridge is driven through the insulation up to the connection conductor.
  • a conductive tape is placed over the contact bridge and wound in a ring around the connecting conductors.
  • the heating conductor then has electrical contact with the associated connecting conductor on this conductive band. Otherwise, the heating conductor lies on the insulation of the connecting conductors.
  • a heating tape is known from GB-OS 2 110 910, in which the heating conductor is first placed helically around a glass fiber core and the glass fiber core with heating conductor is then placed helically around the common insulation of two parallel connecting conductors.
  • the insulation lying above one or the other connecting conductor is alternately removed at predetermined intervals, so that the heating conductor is alternately contacted with one and the other connecting conductor.
  • the section of the heating conductor lying between two contact points is therefore due to the full voltage of the connecting conductors.
  • a heating conductor is known from GB-A 2 197 170, in which the different connecting conductors are free of their insulation and exposed at precisely defined points. By reducing the slope of the heating coil in the contact area, the number of points of contact between the heating coil and the connecting conductors is increased, and thus the contact between the connecting conductors and the heating coil is improved.
  • a self-regulating heating line is known from US Pat. No. 4,314,145 which has non-metallic resistance layers. With such resistance layers, high inrush currents result due to the PTC coefficient, which are controlled by special measures.
  • a parallel heating line is known in which a heating tape is formed by alternately removing the insulation on the two stranded connecting conductors and applying a resistance wire, as described in the preamble of claim 1.
  • a flexible heating element is known from DE-A 3 320 420, in which the contact between the heating conductor and the connecting conductor is improved by soldering, welding, etc.
  • a heating line is known from FR-A 2 533 101, in which at least one further measuring or supply line is additionally provided.
  • EP-A 0 092 406 discloses metallic heating conductors with constant resistance and self-regulating heating cables with non-metallic resistance layers. Possibilities are described how the high inrush current can be managed due to the PTC properties.
  • parallel heating cables consist of two separately insulated copper conductors or insulated in the form of twin strands.
  • the copper conductors serving as connecting lines are generally individually insulated and are usually surrounded in parallel with a common sheath (prospectus ke crememetall electro "Flexwell parallel heating cable").
  • the insulation of the connecting line is removed laterally in a suitable manner to approximately 10 to 20 millimeters in such a way that the copper conductors are exposed. This happens alternately on one and the other opposite narrow side of the parallel wires.
  • a resistance wire made of a suitable material with a predetermined diameter and a certain pitch is then wound over the parallel line prepared in this way.
  • Insulating and sheathing materials can be: thermoplastics, elastomers or combinations of such materials, and also in a cross-linked form for use as a heating line for pipe heating for process control systems in industrial and chemical companies. There have been insulation and especially for such heating lines Sheath materials made of fluoroplastics, e.g. FEP, prevail for operating temperatures up to 200 degrees Celsius.
  • FEP fluoroplastics
  • This material is mainly applied in the extrusion process with temperatures up to 400 degrees Celsius.
  • the different thermal expansion coefficient of the materials present in the line has proven to be disadvantageous for the long-term functionality for lines constructed in this way.
  • the significantly higher expansion of the fluoroplastic to the resistance coil wound over it has proven to be disadvantageous.
  • the relatively thin filament wire is stretched during the application of the insulation at high temperatures due to the heating and expansion of the substructure, which does not return to the starting position when the fluoroplastic is shrunk or cooled.
  • the resistance conductor receives mechanical stresses which lead to warping and warping, so-called clanking.
  • This process is repeated again and again, especially at higher process temperatures in the application and intermittent operation.
  • the service life of the heating cable is reduced as a result of short-circuits between the individual turns of the resistance conductor and ultimately a break in the resistance conductor.
  • the invention is based on the object of developing the previously known parallel heating lines in such a way that the clanking which occurs for the reasons mentioned, Short circuits and breaks in the resistance conductor can be avoided.
  • the parallel heating tape 10 shown in perspective in FIG. 1 consists of two connecting lines 11 and 12, which are normally designed as copper strands or copper wires and are surrounded by individual insulation 13 or 14 or also a common insulation such that the two connecting lines 11 and 12 run parallel.
  • the insulation 13, 14 is laterally removed in a suitable manner over a length of about 1 to 2 centimeters in such a way that the connecting lines 11 and 12 are exposed. This happens alternately on one or the other narrow side of the parallel wires.
  • the resistance line 18 lies directly on one of the two connecting lines 11 and 12, respectively.
  • the fact that one or the other connecting line 11 or 12 is stripped alternately means that the full supply voltage is present between the sections of the resistance line 18 (heating line) thus defined. This results in a very specific heating power per unit length of the heating tape 10 for each section, which can be varied by selecting the resistance value.
  • a compensating element 15 in the form of an elastic layer is applied to the parallel line formed from the connecting lines 11 and 12 with insulations 13 and 14, as is shown in FIG. 1.
  • an elastic band or an elastic cord can also be provided as a compensating element 16 in the incision 17 between the insulations 13 and 14 of the connecting lines 11 and 12.
  • the cord-shaped compensating element 16 can - as shown in FIG. 2 - first be inserted into the incision 17 and then the arrangement constructed in this way can be entirely surrounded by the helically applied resistance line 18. However, as shown in FIG. 3, the compensating element 16 can also be placed on the resistance line 18 from the outside, that it presses the resistance line 18 into the incision 17 between the insulations 13 and 14 of the connecting lines 11 and 12.
  • the two insulated connection lines 11, 12 with their insulations 13, 14 can also be surrounded by an intermediate jacket.
  • Such an intermediate sheath can also be provided instead or additionally at another location, for example as a sheath for the resistance line 18 or - as indicated in FIG. 1 - between a shielding sheath made of wire mesh and the outer sheath 20.
  • the compensating element 15 and 16 leads, on the one hand, to mediation between the two different temperature-related expansions and, on the other hand, to a good embedding of the heating line 18 by the elastic compensating element and thus warps and in particular the so-called clank formation are avoided.
  • the compensating elements can consist of suitable, highly heat-resistant threads, molded parts or strips made of elastomers with certain proportions of mineral fibers or other textile materials as an insert.

Landscapes

  • Resistance Heating (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
EP89909703A 1988-09-02 1989-08-31 Parallel-heizband Expired - Lifetime EP0432192B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89909703T ATE85742T1 (de) 1988-09-02 1989-08-31 Parallel-heizband.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8811264U 1988-09-02
DE8811264U DE8811264U1 (da) 1988-09-02 1988-09-02

Publications (2)

Publication Number Publication Date
EP0432192A1 EP0432192A1 (de) 1991-06-19
EP0432192B1 true EP0432192B1 (de) 1993-02-10

Family

ID=6827622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89909703A Expired - Lifetime EP0432192B1 (de) 1988-09-02 1989-08-31 Parallel-heizband

Country Status (4)

Country Link
EP (1) EP0432192B1 (da)
DE (2) DE8811264U1 (da)
DK (1) DK163787C (da)
WO (1) WO1990003091A1 (da)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100673A (en) * 1977-05-05 1978-07-18 Leavines Joseph E Method of making high temperature parallel resistance pipe heater
US4314145A (en) * 1978-01-30 1982-02-02 Raychem Corporation Electrical devices containing PTC elements
EP0092406B1 (en) * 1982-04-16 1992-06-17 RAYCHEM CORPORATION (a Delaware corporation) Elongate electrical heating device and a system comprising such devices
US4459473A (en) * 1982-05-21 1984-07-10 Raychem Corporation Self-regulating heaters
CH662231A5 (de) * 1982-09-13 1987-09-15 Eilentropp Hew Kabel Flexibles elektrisches ablaengbares heiz- oder temperaturmesselement.
DE3320420A1 (de) * 1982-09-13 1984-12-06 HEW-Kabel Heinz Eilentropp KG, 5272 Wipperfürth Flexibles elektrisches heiz- oder temperaturmesselement
DE3636738A1 (de) * 1986-10-29 1988-05-05 Eilentropp Hew Kabel Ablaengbares flexibles elektrisches heizelement

Also Published As

Publication number Publication date
DE58903545D1 (de) 1993-03-25
EP0432192A1 (de) 1991-06-19
WO1990003091A1 (de) 1990-03-22
DK37291A (da) 1991-04-16
DK163787C (da) 1992-08-24
DK37291D0 (da) 1991-03-01
DK163787B (da) 1992-03-30
DE8811264U1 (da) 1988-11-03

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