EP0157182B1 - Corps de chauffe tubulaire - Google Patents

Corps de chauffe tubulaire Download PDF

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Publication number
EP0157182B1
EP0157182B1 EP85102309A EP85102309A EP0157182B1 EP 0157182 B1 EP0157182 B1 EP 0157182B1 EP 85102309 A EP85102309 A EP 85102309A EP 85102309 A EP85102309 A EP 85102309A EP 0157182 B1 EP0157182 B1 EP 0157182B1
Authority
EP
European Patent Office
Prior art keywords
insulating
tubular heater
heater member
jacket tube
member according
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
Application number
EP85102309A
Other languages
German (de)
English (en)
Other versions
EP0157182A1 (fr
Inventor
Ingo Dipl.-Ing. Dr. Mont. Bleckmann
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.)
ELPAG AG CHUR
Original Assignee
ELPAG AG CHUR
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27207582&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0157182(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19848406445 external-priority patent/DE8406445U1/de
Priority claimed from DE19848413276 external-priority patent/DE8413276U1/de
Priority claimed from DE19848423034 external-priority patent/DE8423034U1/de
Application filed by ELPAG AG CHUR filed Critical ELPAG AG CHUR
Priority to AT85102309T priority Critical patent/ATE39804T1/de
Publication of EP0157182A1 publication Critical patent/EP0157182A1/fr
Application granted granted Critical
Publication of EP0157182B1 publication Critical patent/EP0157182B1/fr
Expired 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

Definitions

  • the invention relates to a tubular heater according to the features of the preamble of claim 1.
  • Tubular heating elements are known from the European patent EP-A-0 010 275, in which a heating coil is embedded in insulating material in a jacket tube made of deformable metal, which is connected at the connecting ends to connecting bolts which have a bolt part with a larger diameter which is in the insulating material is embedded, and have a bolt part with a smaller diameter, which is passed through an insulating bead inserted into the front end of the jacket tube and mechanically held by the jacket tube.
  • the insulating bead should be graduated in diameter and the part of the insulating bead which has the larger diameter should be pressed in between two constrictions or pinches of the jacket tube. Furthermore, a depression is provided on the part of the connecting bolt protruding from the insulating bead, which holds the insulating bead.
  • a disadvantage of the known application is that two constrictions in the jacket tube are required to hold the insulating bead.
  • the part with the largest diameter, which serves to hold the insulating bead in the casing tube, or the part of the insulation bead with the flags is located further or less far in the casing tube.
  • this part is pressed during the manufacture of the constrictions, the insulating bead breaks.
  • the object of the present invention is now to enable a simpler and faster production, the breaking of the insulating bead nevertheless being avoided.
  • a heating coil 2 is arranged concentrically in the casing tube 1 of a tubular heating element and is embedded in insulating material 3, preferably magnesium oxide.
  • the ends of the heating coil 2 are welded to connecting bolts 4, the diameter of which is stepped, i.e. H. which consist of a bolt part 5 with a larger diameter and a bolt part 6 with a smaller diameter.
  • the bolt parts 6 with a smaller diameter are each inserted through the inner bore of an insulating bead 7 or 8, the diameter of the bore of the insulating bead 7 or 8 corresponding approximately to the outer diameter of the bolt part 6.
  • the bolt part 5 having the larger diameter is thus seated with its gradation on the inwardly directed end face of the insulating bead 7 or 8.
  • the bolt part 5 has a z. B. hexagonal cross section so that the bolt can not twist in the pressed insulating material 3.
  • the insulating beads 7, 8 are now held in the jacket tube by crushed or rolled areas 9, 10.
  • a pressing or squeezing 11 in the pin part 6 with the smaller diameter ensures a corresponding fit of the connecting pin 4 in the insulating bead 7 or 8 and prevents the connecting pin from being pulled inwards by the elastic pull of the heating coil 2 through the insulating bead 7, 8 .
  • a wire coil 12 is taut wound on the casing tube 1 and connected to it in the region of the ends of the casing tube 1 by welding or soldering at 13.
  • an insulating bead shown in FIGS. 5 and 7, it consists of a tubular inner body 14, the outer diameter of which is considerably smaller than the inner diameter of the casing tube 1.
  • Wing-shaped tabs 15 are attached to the tubular inner body 14 in one piece at an angular distance of 120 °, which have an approximately sinusoidal cross-section. Between the flags 15, however, the inner body 14 remains free in an area 16 of at least 50 °, but preferably of about 60 °.
  • the insulating bead 7 consists of a break-resistant oxide-ceramic material with a compressive strength N / mm 2 of over 1000 and a bending strength of over 200 according to DIN 40685. Preference is given to insulating beads 7, 8 which are made of highly refractory, dense aluminum oxide with a mass content of over 80 to 90%. and exist with a bulk density of about 3.3 kg / dm 3 .
  • the elasticity modulus of the insulating bead should be over 220 x 10 3 N / mm 2 .
  • An aluminum oxide such as that sold under the trade name "Hilox 880" is preferred.
  • the insulating bead is of stepped construction. It consists of an area 18 whose diameter is smaller than the inside diameter of the casing tube 1 and an area 19 whose diameter corresponds approximately to the inside diameter of the casing tube 1.
  • the insulating beads 8 shown in FIGS. 8 to 10 can be inserted in both ends.
  • the tubular heating element is then first filled with the insulating material 3, that is to say generally with magnesium oxide, the heating coil 2 with the connecting bolts 4 having already been inserted beforehand.
  • the insulating beads 8 are then fixed by squeezing or rolling.
  • insulating beads 7 and 8 are used before the insulating material is filled in, together with the connecting bolts 6 and the heating coil 2.
  • the insulating material 3 is then passed through the intermediate areas 16 filled between the wing-shaped flags 15 of the insulating bead 7. This type of production also enables residual moisture to escape from the insulating material 3. Moisture penetration is prevented by using appropriate water repellants, e.g. B. silicone oil or the like prevented.
  • the tubular heating element jacket can be pressed in in the region 16, whereby the holding of the insulating bead 7 in the tubular heating element jacket 1 is significantly improved. Furthermore, the risk of breakage of the insulating bead 7 by crushing during the production of the pinching or constriction is further reduced.
  • the approach of the flags 15 runs in a slope 20 of approximately 45 °.
  • the transition from the area 18 to the area 19 in the embodiment according to FIGS. 8 to 10 runs at an incline 21 of approximately 30 °.
  • the tightly wound wire coil 12 fulfills several functions.
  • the production of the pinch 11 is facilitated and improved since the force applied does not act directly on the insulating bead via the relatively thin jacket tube.
  • the winding of the wire helix lying in the area of the insulating bead ensures a corresponding distribution of peripheral forces.
  • the surface of the casing tube is enlarged and the heat emission is improved.
  • brackets, heat dissipation plates, etc. can be pressed onto the tubular heating element via cold connections.
  • the insulating bead 8 is seated on a channel-shaped constriction 22. This can be weak, since in any case it prevents the insulating bead from moving towards the interior of the tubular heater.
  • the region of the insulating bead with the larger diameter is, as shown, in the form of a cone 23 tapering in the direction of the tubular heater end. The pressure of the casing tube 1 against the cone 23 extends over a longer distance, so that the pressure is distributed accordingly.
  • FIG. 11 The embodiment shown in FIG. 11 is generally preferred since the insulating bead 8 can be mass-produced easily and expediently and the mechanical mounting thereof in the jacket tube 1 is very satisfactory.
  • the embodiment shown in Fig. 12 is suitable for special purposes.
  • the insulating bead has a spherical surface 24, ie the diameter decreases from a largest average diameter both in the direction of the interior of the tubular heater and in the direction of the connection end.
  • the casing tube 1 is now pressed onto this ball-shaped surface 24 in a single pressing operation, with constrictions 25 and 26 being formed without further action by the large-area pressing, through which the intermediate part 27 of the casing tube 1 contacts the ball-shaped surface 24 the insulating bead is attracted.
  • the insulating bead is spared accordingly, so that breakage or cracking no longer occurs even with less break-resistant material or higher pressing pressures are used with sufficiently break-resistant material can.
  • the outer surface of the insulating bead is concavely recessed at 28.
  • the region 29 of the casing tube 1 is pressed into the groove formed in this way.
  • a rotating pressing tool should be used or the pressing should be carried out by rotating the tubular heating element.
  • FIG. 15 The embodiment shown in FIG. 15 is preferred if, after soldering, a rubber cap 31 has to be applied to the end of the tubular heating element to remove the flux, which prevents the detergent from penetrating into the tubular heating element.
  • the acidic agents could otherwise form an electrically conductive layer on the insulator surface. If the diameters are chosen so that d 1 ⁇ d 2 ⁇ d 3 , the rubber cap 31 can be easily applied. It is anchored in the gutter-shaped constriction 22.
  • a tubular connecting element is pressed in such a way that it has a butt-conical end 34, a flat-pressed flag 35, an unpressed central shaft 36 and pressed-out tabs 37.
  • the heating coil 2 is welded onto the truncated conical end 34, if necessary by means of a contactless welding technique.
  • the flat-pressed flag 35 is embedded in the insulating material 3, so that the tubular connecting bolt is held against rotation. By pressing out the flag 35, a shoulder is formed, on which the insulating bead 8 is seated, and if necessary, with the interposition of an annular disc, it is pressed onto the shoulder of the flag 35 by pressing out the tabs 37.
  • the jacket of the insulating bead 8 is designed in the form of a cone 23 which merges into a part with a smaller diameter via a step.
  • the jacket tube 1 has an annular constriction at 22 on which the insulating bead 8 is seated.
  • the jacket tube is pressed against the cone of the insulating bead 8. The result is an absolutely secure connection both in the axial and in the radial direction.
  • the tubular design of the connecting element has the advantage, on the one hand, that the extrusions mentioned can be produced without great effort.
  • a temperature monitoring element 38 can be inserted into the tube, which has an integrated circuit, for. B. a washing machine controls.
  • the temperature monitoring element z. b. consist of a PTC bead, i.e. a resistance material with a positive temperature gradient.
  • the solution shown has the advantage of a very precise heat flow, namely regardless of a rotation of the tubular heater z. B. during installation.
  • the heat generated by the heating coil flows via the frustoconical end 34, the flag 35 radially via the insulating bead 8 to the jacket tube. Since the connection end of the casing tube is no longer covered, no limescale can form.
  • the temperature monitoring element 38 which is located concentrically in the heat flow, can thus be set very precisely to a specific temperature of the heating coil 2, so that the power supply is switched off when this temperature is exceeded.
  • the temperature monitoring element 38 can only be inserted into the tubular connecting element after completion of the tubular heating element, so that damage, for. B. when pressing the tubular heater are excluded. Is the interchangeability dispensed with and another fixation of the temperature monitoring element 38 z. B. selected by gluing, then the pressing 40 or the flag 35 can be omitted.
  • the insulating bead 7 or 8 can be connected to the inner circumferential surface of the tubular heating element by means of an adhesive. Furthermore, the areas 16 between the tabs 15 of the insulating bead can be closed by an adhesive. In addition, the connecting pin 4 can be glued into the insulating bead 7 or 8. These measures can be used to produce or improve a frictional connection or insulating bead with the jacket tube, in particular if, for. B. lower pressures to be exerted on the jacket tube.
  • the temperature monitoring element 38 provides a significant improvement in security, e.g. B. against fire in devices with plastic containers, with insignificant additional effort.

Landscapes

  • Resistance Heating (AREA)

Claims (11)

1. Elément chauffant tubulaire, dans lequel dans une enveloppe tubulaire (1) en métal déformable, on noie dans un matériau isolant (3) un serpentin chauffant (2) relié à chacune des extrémités de raccordement à un boulon connecteur (4) et dans lequel le boulon connecteur traverse une perle isolante (7, 8) et est bloqué par celle-ci pour l'empêcher de se déplacer axialement, caractérisé en ce que les perles isolantes (7, 8) sont constituées par une alumine superréfractaire compacte, ayant une teneur massique supérieure à 80 % et allant jusqu'à 90 % et une masse volumique apparente d'environ 3,3 kg/dm3 et en ce que chaque perle isolante (7, 8) est tenue par un simple étranglement (9, 10) de l'enveloppe tubulaire (1).
2. Elément chauffant tubulaire selon la revendication 1, caractérisé en ce que le matériau des perles isolantes a une résistance en compression supérieure à 1000 N/mm2 et une résistance à la flexion supérieure à 200 N/mm2 selon DIN 40685.
3. Elément chauffant tubulaire selon la revendication 1 ou 2, caractérisé en ce qu'on prévoit dans l'une des extrémités de l'enveloppe tubulaire (1) une perle isolante (8) dont la périphérie appuie en continu sur la surface intérieure de l'enveloppe tubulaire (1), tandis qu'on prévoit dans l'extrémité opposée de l'enveloppe tubulaire (1) une perle isolante (7) avec des queues (15) en forme d'ailettes.
4. Elément chauffant tubulaire selon l'une des revendications 1 à 3, caractérisé en ce que la partie de plus grand diamètre de la perle isolante (7, 8) a une surface latérale conique (23), concave (28) ou bombée (24).
5. Elément chauffant tubulaire selon la revendication 4, caractérisé en ce qu'on prévoit dans l'enveloppe tubulaire (1) un étranglement (22, 25, 40) qui passe derrière le bord frontal de la perle isolante (7, 8) tourné vers l'intérieur de l'élément chauffant tubulaire et en ce que l'enveloppe tubulaire (1) est pressée contre la partie de la perle isolante (7, 8) présentant le plus grand diamètre.
6. Elément chauffant tubulaire selon la revendication 5, caractérisé en ce que l'étranglement (22) sert à ancrer un capuchon en caoutchouc (31) fermant l'extrémité de l'élément chauffant tubulaire.
7. Elément chauffant tubulaire selon l'une des revendications 1 à 6, caractérisé en ce que le boulon connecteur (4) est creux, et en ce que la partie du boulon connecteur (4) noyée dans le matériau isolant est pressée pour former un corps creux (35) qui est noyé dans le matériau isolant (3), ce qui l'empêche de tourner.
8. Elément chauffant tubulaire selon la revendication 7, caractérisé en ce qu'on introduit dans le boulon connecteur creux un élément de contrôle de température (38) fixé à des fils de raccordement (39) pour un circuit intégré.
9. Elément chauffant tubulaire selon l'une des revendications 1 à 8, caractérisé en ce que les queues (15) de la perle isolante (7) dépassent du corps de base en forme de cylindre creux par un biseau de transition d'environ 45° et ont une section transversale sensiblement sinusoïdale, et en ce qu'entre les racines des queues (15) le corps de base en forme de cylindre creux est libre sur un angle d'environ 60°.
10. Elément chauffant tubulaire selon l'une des revendications 1 à 9, caractérisé en ce que sur l'extrémité de l'enveloppe tubulaire (1) est fortement enroulée une spirale de fil métallique (12) qui s'étend au moins sur la zone de la perle isolante jusqu'aux extrémités frontales de l'enveloppe tubulaire (1).
11. Elément chauffant tubulaire selon l'une des revendications 1 à 10, caractérisé en ce que la perle isolante (7, 8) est reliée par un adhésif à la surface d'enveloppe intérieure de l'élément chauffant tubulaire.
EP85102309A 1984-03-01 1985-03-01 Corps de chauffe tubulaire Expired EP0157182B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85102309T ATE39804T1 (de) 1984-03-01 1985-03-01 Rohrheizkoerper.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE8406445U 1984-03-01
DE19848406445 DE8406445U1 (de) 1984-03-01 1984-03-01 Rohrheizkoerper
DE19848413276 DE8413276U1 (de) 1984-04-30 1984-04-30 Rohrheizkoerper mit isolierperle
DE8413276U 1984-04-30
DE8423034U 1984-08-02
DE19848423034 DE8423034U1 (de) 1984-08-02 1984-08-02 Rohrheizkoerper

Publications (2)

Publication Number Publication Date
EP0157182A1 EP0157182A1 (fr) 1985-10-09
EP0157182B1 true EP0157182B1 (fr) 1989-01-04

Family

ID=27207582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102309A Expired EP0157182B1 (fr) 1984-03-01 1985-03-01 Corps de chauffe tubulaire

Country Status (2)

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EP (1) EP0157182B1 (fr)
DE (1) DE3567347D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1294562B1 (it) * 1997-02-07 1999-04-12 I R C A Spa Ind Resistenze Cor Procedimento di realizzazione di resistenze corazzate e resistenza ottenuta con il procedimento.
CN115623616B (zh) * 2022-11-09 2023-07-14 佛山市飞月电热科技有限公司 一种电热管上的绝缘结构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2451175A1 (de) * 1974-10-28 1976-05-06 Guenter Garbe Komplexe keramik-heizelemente mit mindestens je zwei eingesinterten metallischen elektrizitaetsleitern
DE7830574U1 (de) * 1978-10-13 1983-07-28 Elpag AG Chur, 7001 Chur Endenabdichtung fuer einen elektrischen rohrheizkoerper
DE3145876A1 (de) * 1981-11-19 1983-07-14 Elpag AG Chur, 7001 Chur Elektrisch beheiztes geraet
DE3204875C2 (de) * 1982-02-12 1985-02-07 Elpag Ag Chur, Chur Rohrheizkörper mit einer Überlastungssicherung

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Publication number Publication date
EP0157182A1 (fr) 1985-10-09
DE3567347D1 (en) 1989-02-09

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