EP0030894A1 - Ausgeschnittenes Heizwiderstandselement für elektrische Hausheizkörper, Herstellungsverfahren und zugehöriger Heizkörper - Google Patents

Ausgeschnittenes Heizwiderstandselement für elektrische Hausheizkörper, Herstellungsverfahren und zugehöriger Heizkörper Download PDF

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Publication number
EP0030894A1
EP0030894A1 EP80401776A EP80401776A EP0030894A1 EP 0030894 A1 EP0030894 A1 EP 0030894A1 EP 80401776 A EP80401776 A EP 80401776A EP 80401776 A EP80401776 A EP 80401776A EP 0030894 A1 EP0030894 A1 EP 0030894A1
Authority
EP
European Patent Office
Prior art keywords
ribbon
strip
series
edges
element 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.)
Granted
Application number
EP80401776A
Other languages
English (en)
French (fr)
Other versions
EP0030894B1 (de
Inventor
Pierre Schwob
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.)
SEB SA
Original Assignee
SEB SA
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 SEB SA filed Critical SEB SA
Publication of EP0030894A1 publication Critical patent/EP0030894A1/de
Application granted granted Critical
Publication of EP0030894B1 publication Critical patent/EP0030894B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/24—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor being self-supporting

Definitions

  • the present invention relates to a cut resistant heating element, in particular for a domestic electric radiator.
  • It also relates, by way of application, to a radiator provided with such an element.
  • Resistant elements of the kind referred to here are obtained from a metal tape a few tenths of a millimeter thick, intended to dissipate about 3w / cm 2, such as those described in French patent n ° 71 17195.
  • this tape two are practiced. series of slots nested one against the other, the slots of each series being offset on either side of the longitudinal axis of the ribbon. This gives an electrical circuit composed of conductive metal strips left between the slots and arranged in a zigzag .
  • the element thus obtained of very small thickness, has no mechanical strength, and it is necessary to fix on its edges strips of insulating material which give it a certain rigidity allowing its manipulation and its fixing in a radiator.
  • the ribbon In order to radiate effectively, the ribbon is mounted vertically in the operating position. If the lower insulating strip generally behaves properly at operating temperature, the same is not true of the upper strip which is brought to a markedly higher temperature, due in particular to the natural convection which occurs on along the ribbon.
  • the present invention aims to produce a resistant heating element such that the insulating strips are preserved from dangerous temperatures for their behavior.
  • the resistant heating element in particular for a domestic electric radiator, comprises a metal strip in which are two series of nested transverse slots. These two series are offset respectively on either side of the longitudinal axis of the ribbon, and the slots of each series are extended to the corresponding edge of the ribbon to constitute, by the metal strips located between the slots, an electrical conductor. in a zig-zag, this ribbon being curved along its length between its two edges disposed opposite one another and substantially parallel to one another. It is characterized in that, in the curved part of the ribbon, the conductive strips are folded, one towards the inside and the other towards the outside of said curved part according to a predetermined alternation law.
  • the curved part is thus split into two layers successively traversed by the ascending air, through relatively wide openings arranged in a baffle, which ensures excellent convection.
  • the metal strips have a variable section between the edges of the ribbon, so as to locate the heating part in the region of smallest section.
  • the strip has, on its edges, a series of holes for receiving pins for fixing an insulating strip, and these pins are provided at their base with a shoulder to maintain the strip away from the ribbon.
  • the ascending air thus passes between the ribbon and the strip to effect effective ventilation which avoids overheating the strip.
  • the strip has, on its edges, a series of slots for receiving bars secured to an insulating strip.
  • the domestic electric radiator comprises at least one resistant heating element in accordance with that described above and it is characterized in that it comprises supports provided with flexible claws to cooperate with ribs of the strip insulation bordering the heating element, thus allowing the fixing of the heating elements by snap-fastening.
  • the heating element comprises a metal strip 1 in which two series of slots are made, respectively 2 and 3, such that the slots 2 reach an edge 4 of the strip and that the slots 3, nested in the slots 2 reach the other edge 5 of the ribbon.
  • the metal strips 7, 8 which remain between the slots thus constitute a zigzag electrical circuit.
  • the ribbon is bent in a U along its length so that the aforementioned metal strips constitute two plies 9, 11 extending parallel to each other, on either side of the bending region 12.
  • the strips 7 are bent in a V towards the inside of the bent part, while the strips 8, which alternate with the strips 7, are folded in a V outward (Fig 1 to 4).
  • the strips 7, 8 are folded longitudinally to form metal references 13 (Fig 8). In the bending region 12, these references are removed to reduce the section of the strips, locate the heating there and allow bending.
  • claws 14 are cut from the ribbon and folded down on an insulating strip 15. On the right part of FIG. 5, claws 14 are shown before they are folded down.
  • punctures 16 are formed in the edges of the ribbon, between the claws 14, and directed towards the side where the band 15 is applied, so as to become embedded in the latter and to prevent it from sliding in the claws. 14.
  • Holes 17 are made in the edges 4 and 5 of the ribbon to allow it to advance in the cutting and forming machine.
  • the shearing along line 6 is deliberately incomplete and leaves a band 18 which short-circuits some of the bands 7 and 8 near the end of the ribbon.
  • the length of this strip 18, and therefore the number of short-circuited strips 7, 8, is determined so that the heating element has a predetermined electrical resistance, independently of accidental variations in the thickness of the metal.
  • an electrical connection terminal 19 is welded to one end of the strip.
  • an electric radiator intended to receive the heating element which has just been described comprises a support 21 made of relatively flexible insulating material.
  • the support comprises two lips 22; 23 fitted respective stiffeners 24, 25.
  • the space between these lips is provided to receive an edge of the tape provided with its insulating strip 15.
  • the lip 22 has a claw 26 which engages between two ribs 27 of the strip 15. To allow this engagement, the lip 22 is made flexible by an interruption 28 of the stiffener 24.
  • the heating element As described, one starts with a metal ribbon in which the lateral holes 17 are made with excellent precision, because they must serve as guides for the progression of the ribbon in the cutting and forming machine.
  • the insulating strips 15 are then put in place and the claws are folded down 14. Finally, the edges of the ribbon are sheared along the cutting lines 6, possibly leaving a certain length 18 unsheared. The ribbon then has the appearance shown in the left part of Fig 5.
  • the element is then mounted in a radiator by simply snapping the edges into the supports 21 provided for this purpose (Fig 9).
  • the heating element is placed as shown in Figs 1 to 4, that is to say the insulating strips at the bottom and the curved part at the top. All of the metal heats up and creates rising convection currents, which has the effect, by ventilating the element, of cooling the base, that is to say in particular the insulating strips 15 which are thus preserved.
  • the ascending air In the bending region, the ascending air successively crosses two plies constituted respectively by the Vs of Fig 2 and 3. In each of the two plies, the spacing of two adjacent bands 7 (or 8) is two steps, which facilitates the passage. On the other hand, the passage is in a baffle, which improves, by turbulence, the heat exchange between the metal and the air.
  • a series of holes is made in the edge 5 of the ribbon to receive a corresponding series of pins 131 provided on the insulating strip 115.
  • Each pin has at its base a shoulder 132 on which the ribbon is supported. The tape is thus kept away from the tape and ventilation is established between them, which has the effect of lowering the temperature of the edge of the tape and of the insulating tape.
  • the method of fixing the strip 215 is substantially the same, by pins 231 provided with shoulders 232, but, moreover, the edge 205 of the ribbon has slots 233 in which are fitted bars 234 secured to the strip 215. The presence of these bars prevents a deformation of the ribbon in parallelogram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
EP19800401776 1979-12-11 1980-12-10 Ausgeschnittenes Heizwiderstandselement für elektrische Hausheizkörper, Herstellungsverfahren und zugehöriger Heizkörper Expired EP0030894B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7930357 1979-12-11
FR7930357A FR2471721A1 (fr) 1979-12-11 1979-12-11 Element resistant chauffant decoupe pour radiateur electrique domestique, procede de fabrication et radiateur s'y rapportant

Publications (2)

Publication Number Publication Date
EP0030894A1 true EP0030894A1 (de) 1981-06-24
EP0030894B1 EP0030894B1 (de) 1983-03-23

Family

ID=9232638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401776 Expired EP0030894B1 (de) 1979-12-11 1980-12-10 Ausgeschnittenes Heizwiderstandselement für elektrische Hausheizkörper, Herstellungsverfahren und zugehöriger Heizkörper

Country Status (3)

Country Link
EP (1) EP0030894B1 (de)
DE (1) DE3062471D1 (de)
FR (1) FR2471721A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328078A1 (de) * 1983-08-03 1985-02-21 Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal Widerstandsheizelement
EP0122088B1 (de) * 1983-03-30 1987-04-08 Vg Instruments Group Limited Quelle für Molekülstrahl-Epitaxie
DE3605611A1 (de) * 1986-02-21 1987-08-27 Braun Ag Verfahren zum herstellen eines heizkoerpers
FR2608883A1 (fr) * 1986-12-19 1988-06-24 Seb Sa Element resistant chauffant decoupe pour radiateur electrique, son procede de fabrication et radiateur s'y rapportant
DE3706601A1 (de) * 1987-02-28 1988-09-08 Eichenauer Gmbh & Co Kg F Heizkoerper mit maeanderfoermig gewundenem heizleiter und widerstandsdraht
EP0355210A1 (de) * 1988-08-26 1990-02-28 Koninklijke Philips Electronics N.V. Heizelement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR799638A (fr) * 1934-12-21 1936-06-16 Dispositif pour le chauffage électrique de locaux
DE650676C (de) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Bandheizkoerper fuer elektrische Widerstandsoefen
US2129046A (en) * 1935-07-01 1938-09-06 Expanded Metal Electrical heater and resistance
GB731208A (en) * 1953-04-09 1955-06-01 British Thomson Houston Co Ltd Improvements in and relating to electric heating elements and methods of making same
DE1018512B (de) * 1955-09-24 1957-10-31 Siemens Ag Zonenweise gefasste elektrische Leiter, insbesondere Widerstaende

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE650676C (de) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Bandheizkoerper fuer elektrische Widerstandsoefen
FR799638A (fr) * 1934-12-21 1936-06-16 Dispositif pour le chauffage électrique de locaux
US2129046A (en) * 1935-07-01 1938-09-06 Expanded Metal Electrical heater and resistance
GB731208A (en) * 1953-04-09 1955-06-01 British Thomson Houston Co Ltd Improvements in and relating to electric heating elements and methods of making same
DE1018512B (de) * 1955-09-24 1957-10-31 Siemens Ag Zonenweise gefasste elektrische Leiter, insbesondere Widerstaende

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122088B1 (de) * 1983-03-30 1987-04-08 Vg Instruments Group Limited Quelle für Molekülstrahl-Epitaxie
DE3328078A1 (de) * 1983-08-03 1985-02-21 Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal Widerstandsheizelement
DE3605611A1 (de) * 1986-02-21 1987-08-27 Braun Ag Verfahren zum herstellen eines heizkoerpers
FR2608883A1 (fr) * 1986-12-19 1988-06-24 Seb Sa Element resistant chauffant decoupe pour radiateur electrique, son procede de fabrication et radiateur s'y rapportant
DE3706601A1 (de) * 1987-02-28 1988-09-08 Eichenauer Gmbh & Co Kg F Heizkoerper mit maeanderfoermig gewundenem heizleiter und widerstandsdraht
EP0355210A1 (de) * 1988-08-26 1990-02-28 Koninklijke Philips Electronics N.V. Heizelement

Also Published As

Publication number Publication date
FR2471721A1 (fr) 1981-06-19
DE3062471D1 (en) 1983-04-28
EP0030894B1 (de) 1983-03-23
FR2471721B1 (de) 1983-04-01

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