EP0432192A1 - Parallel-heizband. - Google Patents
Parallel-heizband.Info
- Publication number
- EP0432192A1 EP0432192A1 EP89909703A EP89909703A EP0432192A1 EP 0432192 A1 EP0432192 A1 EP 0432192A1 EP 89909703 A EP89909703 A EP 89909703A EP 89909703 A EP89909703 A EP 89909703A EP 0432192 A1 EP0432192 A1 EP 0432192A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compensating element
- heating tape
- parallel heating
- parallel
- elastic
- 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
Links
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 locations by driving an electrically conductive contact bridge through the insulation 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 laid helically around a glass fiber core and the glass fiber core with heating conductor is then helically placed around the common insulation of two parallel connecting conductors. At predetermined intervals, the insulation lying over one or the other connecting conductor is alternately removed, 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.
- parallel heating cables consist of two separately insulated copper conductors or insulated in the form of twin wires.
- the copper conductors serving as connecting lines are generally individually insulated and are usually surrounded in parallel with a common sheathing (brochure ke creme etall electro "Flexwell parallel heating line").
- 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 takes place alternately on the one and the other opposite narrow side of the parallel wire.
- 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 cross-linked form for use as a heating line for pipe heating for process control systems in industrial and chemical companies.
- insulation and Sheath materials made of fluoroplastics, eg FEP prevail for operating temperatures up to 200 degrees Celsius.
- 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 been found to be disadvantageous for the long-term functionality for lines constructed in this way.
- the substantially higher expansion of the fluoroplastic to form the resistance coil wound over it has proven to be disadvantageous.
- the relatively thin helix 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 clinching.
- the invention is based on the object of developing the previously known parallel heating lines in such a way that the patient Formations, short circuits and breaks in the resistance conductor can be avoided.
- Fig. 1 is a schematic representation of a
- FIG 3 shows a cross section through a parallel heating band with compensating element outside the heating coil.
- the parallel heating band 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 Connection 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 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 of the connecting lines 11 and 12 is stripped alternately means that the full supply voltage is present between the sections of the idle line 18 (heating line) thus defined.
- the result for each section is a very specific heating output per unit length of the heating tape 10, 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 helical resistor line 18. However, as shown in FIG. 3, the compensating element 16 can also be placed on the resistance line 18 from the outside, - € -
- the two insulated connecting lines 11, 12 with their insulations 13, 14 can also be surrounded by an intermediate jacket.
- a cladding can also be provided instead or additionally at another location, for example as a sheathing also for the resistance line 18 or - as indicated in FIG. 1 - between a shielding cladding made of wire mesh and the outer cladding 20.
- the compensating element 15 or 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 warpage and in particular the so-called clanking be 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)
Description
Claims
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 DE8811264U1 (de) | 1988-09-02 | 1988-09-02 | Parallel-Heizband |
DE8811264U | 1988-09-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0432192A1 true EP0432192A1 (de) | 1991-06-19 |
EP0432192B1 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 (de) |
DE (2) | DE8811264U1 (de) |
DK (1) | DK163787C (de) |
WO (1) | WO1990003091A1 (de) |
Family Cites Families (7)
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 |
IN159153B (de) * | 1982-04-16 | 1987-04-04 | Raychem Corp | |
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 |
-
1988
- 1988-09-02 DE DE8811264U patent/DE8811264U1/de not_active Expired
-
1989
- 1989-08-31 EP EP89909703A patent/EP0432192B1/de not_active Expired - Lifetime
- 1989-08-31 DE DE8989909703T patent/DE58903545D1/de not_active Expired - Fee Related
- 1989-08-31 WO PCT/DE1989/000573 patent/WO1990003091A1/de active IP Right Grant
-
1991
- 1991-03-01 DK DK037291A patent/DK163787C/da not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9003091A1 * |
Also Published As
Publication number | Publication date |
---|---|
DK37291D0 (da) | 1991-03-01 |
WO1990003091A1 (de) | 1990-03-22 |
DE8811264U1 (de) | 1988-11-03 |
DK163787C (da) | 1992-08-24 |
DK37291A (da) | 1991-04-16 |
DE58903545D1 (de) | 1993-03-25 |
DK163787B (da) | 1992-03-30 |
EP0432192B1 (de) | 1993-02-10 |
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