EP0579161A2 - Rohrheizkörper - Google Patents

Rohrheizkörper Download PDF

Info

Publication number
EP0579161A2
EP0579161A2 EP93111170A EP93111170A EP0579161A2 EP 0579161 A2 EP0579161 A2 EP 0579161A2 EP 93111170 A EP93111170 A EP 93111170A EP 93111170 A EP93111170 A EP 93111170A EP 0579161 A2 EP0579161 A2 EP 0579161A2
Authority
EP
European Patent Office
Prior art keywords
outer tube
interior
heating element
connecting bolts
elevations
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Withdrawn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
EP93111170A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0579161A3 (enrdf_load_stackoverflow
Inventor
Karl Kaluza
Herbert Weber
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.)
C SCHNIEWINDT KG
Original Assignee
C SCHNIEWINDT KG
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 C SCHNIEWINDT KG filed Critical C SCHNIEWINDT KG
Publication of EP0579161A2 publication Critical patent/EP0579161A2/de
Publication of EP0579161A3 publication Critical patent/EP0579161A3/xx
Withdrawn legal-status Critical Current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
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes
    • 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
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material

Definitions

  • the invention relates to a tubular heater with an outer tube, connecting bolts which are arranged in the end sections of the outer tube and end closures which close the interior of the outer tube to the outside, a heating conductor wire which is connected at the ends to the connecting bolts and the interior of the outer tube passes through, and filling material that surrounds the heating wire in the interior of the outer tube and completely fills the interior.
  • a composite consisting of the connecting bolts and the heating conductor wire is drawn or inserted into the outer tube.
  • the remaining inner space of the outer tube is filled with the filling or insulation material in a suitable filling system.
  • the diameter of the outer tube is reduced in order to solidify the filling material and to fix the heating conductor wire within the interior of the outer tube.
  • a reducing mill can be used for this purpose.
  • the diameter of the outer tube is reduced from one tube end.
  • the one located in the interior of the outer tube Filling material is not only compressed during this process, but also partially displaced in the reduction direction inside the interior.
  • this displacement of the filling material results in the effect that the heating wire is stretched over a certain distance; after completion of the reduction in diameter of the outer tube, there is therefore a permanent mechanical tensile stress on the heating conductor wire in the transition region between the heating conductor and the connecting bolt due to the displacement of the filling material described above.
  • this tensile stress leads to mechanical and thermal fatigue of the material of the heating conductor wire, with the result that the tubular heating element fails prematurely due to the heating conductor wire tearing.
  • the invention has for its object to provide a tubular heater in which tearing or lengthening of the heating wire is reliably avoided.
  • this object is achieved in that the connecting bolts on the outer lateral surface and / or the end sections of the outer tube receiving the connecting bolts have elevations on the inner walls. Due to the design of these elevations, a relative movement of the filling material within the outer tube with respect to the connection bolt is, if not avoided, largely restricted. The build-up of tensile stress in the heating wire is thus prevented or the tensile stress that arises is kept at a maximum value which cannot lead to the heating conductor wire being torn off. Failures of the tubular heater due to the displacement of the filler material in the transition area between the connecting bolt and the heating wire can thus be excluded.
  • the elevations can be formed by threads, by roughening, by grooves or by profiling, the shape of the structures mentioned being so determined that movement of the filler material with respect to the connecting bolt is avoided as completely as possible.
  • a particularly advantageous embodiment of the tubular heater according to the invention is obtained if the connecting bolts in the outer lateral surface area and / or the inner wall region of the end sections of the outer tube receiving the connecting bolts are made of a material that roughened when contacted with the filler material. With this configuration, any difficulties in the assembly of the tubular heating element, which result from the structuring of the surfaces in question, can be prevented.
  • a tubular heater shown in the figure consists essentially of an outer tube 1, connecting bolts 2, a heating wire 3 and filler material 4th
  • the open end of the outer tube 1 is closed by the electrically insulating end termination 5 arranged coaxially in the outer tube 1.
  • the outer diameter of the connecting bolt 2 is, among other things. depending on the inner diameter of the outer tube 1 and on the current with which the tubular heater is to be operated.
  • the length dimensions of the connecting bolt 2 depend on the length of the unheated zone of the tubular heater.
  • the ends of the resistance or heating conductor wire 3 are connected to the end face of the connecting bolt 2 oriented toward the interior of the outer tube 1.
  • the heating conductor wire 3, which is advantageously designed as a heating conductor coil, runs through the entire extent of the interior space formed by the outer tube 1 and the connecting bolt 2.
  • the interior is filled with a filling or insulation material 4, for example magnesium oxide or aluminum oxide, so that contact between the heating wire 3 and the inner wall of the outer tube 1 is reliably avoided.
  • a filling or insulation material for example magnesium oxide or aluminum oxide
  • the connecting bolt 2 is provided on its outer lateral surface 6 with a thread 7.
  • the outer circumferential surface 6 can also be provided with a roughening, grooving or profiling or structured by changing the diameter of the connecting bolt 2.
  • the inner wall of the end section of the outer tube 1 receiving the connecting bolt 2 can also be structured or structurable.
  • a composite of the connecting bolts 2 and the heating conductor wire 3 is inserted or drawn into the outer tube 1.
  • the interior of the outer tube 1 is completely filled with the filling or insulation material 4 in a suitable filling system.
  • the diameter of the outer tube 1 is reduced, for example in a reducing mill, in order to solidify or compact the filler material 4 and to fix the heating conductor wire 3.
  • the diameter reduction is carried out from one end of the outer tube 1. Accordingly, this will the filling material 4 not only solidifies and compresses, but it is also partially displaced in the direction of the area of the outer tube 1, the diameter of which has not yet been reduced, and thus in the direction of the connecting bolt 2.
  • the structuring of the outer lateral surface of the connecting bolt 2 or the inner wall of the end section of the outer tube 1 receiving the connecting bolt 2 prevents the filling material 4 from migrating in the direction of the region of the outer tube 1, the diameter of which has not yet been reduced, if not completely prevented significantly restricted.
  • the heating conductor wire 3 is not subjected to tensile stresses at the transition area to the connecting bolt 2 or only to a negligible extent. Operational failures due to tensile stresses on the heating conductor coil or heating conductor wire 3 are therefore excluded.

Landscapes

  • Resistance Heating (AREA)
EP93111170A 1992-07-17 1993-07-13 Rohrheizkörper Withdrawn EP0579161A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4223549 1992-07-17
DE19924223549 DE4223549A1 (de) 1992-07-17 1992-07-17 Rohrheizkörper

Publications (2)

Publication Number Publication Date
EP0579161A2 true EP0579161A2 (de) 1994-01-19
EP0579161A3 EP0579161A3 (enrdf_load_stackoverflow) 1994-02-23

Family

ID=6463447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111170A Withdrawn EP0579161A2 (de) 1992-07-17 1993-07-13 Rohrheizkörper

Country Status (2)

Country Link
EP (1) EP0579161A2 (enrdf_load_stackoverflow)
DE (1) DE4223549A1 (enrdf_load_stackoverflow)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB621868A (en) * 1945-05-25 1949-04-21 British Thomson Houston Co Ltd Improvements in and relating to terminal structures in electric heaters
DE831122C (de) * 1949-08-02 1952-02-11 Theodor Stiebel Dipl Ing Dr Anordnung zum hitzebestaendigen und fluessigkeitsdichten Abschluss der Enden von elektrischen Rohrheizkoerpern
US2625634A (en) * 1950-08-30 1953-01-13 Wiegand Co Edwin L Electric heating
US3934333A (en) * 1973-07-25 1976-01-27 Churchill John W Method of constructing bilateral heater unit
DE2460172B2 (de) * 1974-12-19 1977-11-03 Helios Gmbh, 5982 Neuenrade Rohrheizkoerper
JPS55100692A (en) * 1979-01-29 1980-07-31 Isamu Saku Method of sealing pipe heater
DE8413276U1 (de) * 1984-04-30 1984-07-26 Elpag Ag Chur, Chur Rohrheizkoerper mit isolierperle

Also Published As

Publication number Publication date
DE4223549A1 (de) 1994-01-20
EP0579161A3 (enrdf_load_stackoverflow) 1994-02-23

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