EP0644708A2 - Strahlungsheizkörper für Glaskeramikkochflächen - Google Patents

Strahlungsheizkörper für Glaskeramikkochflächen Download PDF

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Publication number
EP0644708A2
EP0644708A2 EP94250229A EP94250229A EP0644708A2 EP 0644708 A2 EP0644708 A2 EP 0644708A2 EP 94250229 A EP94250229 A EP 94250229A EP 94250229 A EP94250229 A EP 94250229A EP 0644708 A2 EP0644708 A2 EP 0644708A2
Authority
EP
European Patent Office
Prior art keywords
radiant heater
holding elements
insulating body
heater according
heating
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Withdrawn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
EP94250229A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0644708A3 (enExample
Inventor
Bernd Haseloff
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.)
ELEKTROWAERME BELZIG GmbH
Original Assignee
Elektrowarme Belzig 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
Priority claimed from DE19934332884 external-priority patent/DE4332884A1/de
Application filed by Elektrowarme Belzig GmbH filed Critical Elektrowarme Belzig GmbH
Publication of EP0644708A2 publication Critical patent/EP0644708A2/de
Publication of EP0644708A3 publication Critical patent/EP0644708A3/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Withdrawn legal-status Critical Current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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • the invention relates to a radiant heater according to the preamble of claim 1.
  • DE-OS 25 51 137 describes a meandering, upright heating conductor tape in the form of a right-angled broken meander with fastening tabs for holding the tape in an insulating washer.
  • the assembly of the heating conductor tape requires additional work steps, is complicated due to the risk of breakage of the insulating washer and takes a relatively long time to reach a high level of efficiency in the heat radiation in the direction of the glass ceramic cooking surface.
  • the solution presented in DE 39 35 031 for mounting the heating resistors on heating element supports has an unfavorable behavior of the area occupied by the heating element supports compared to the available surface of the thermal insulation.
  • the relatively compact heating element supports have a disadvantageous effect on the glow time due to their high inherent heat capacity, especially in the switch-on phase.
  • Known solutions include the laying of heating resistors in trenches or recesses on the insulating body and an attachment of the heating resistors by means of a number of hook-shaped holding elements (DE 36 40 999) or, without trays, the attachment of the heating resistors with a large number of U-shaped brackets (DE 23 39 768) in front. Such laying and fastening methods are extremely difficult to assemble.
  • Inhomogeneous radiation intensity and larger so-called cold spots have a number of known arrangements of the heating resistors because, due to the process and the production process, they do not reach the optimum level of the heating element being covered with heating resistors.
  • the object of the invention is to achieve a homogeneous radiation intensity in a radiant heater and, while maintaining or reducing the small installation depth, to increase the heating effect achievable per unit area, to use fewer holding elements with a small contact surface for the heating resistors, to facilitate the assembly of the radiant heating element and to reduce the assembly effort reduce and achieve a very uniform, almost fully symmetrical arrangement of the heating resistors, which results in the rapid reaching of the annealing state and a uniform glow pattern.
  • a type of fastening for the holding elements has to be proposed, which can be carried out outside the manufacturing process of the insulating body, additional operations such as gluing and drying process after gluing being avoided in order to avoid fogging of the underside of the glass ceramic plate by solvents.
  • the assembly of wire bridges necessary for wiring purposes should be combined. In spite of the minimal number of holding bars, a safe position of the unstable heating meanders must be ensured.
  • heating resistors made of wire which are preferably designed as heating meanders, spirally arranged at close spacing in receiving grooves of an insulating body, made of known material and according to known methods, the receiving grooves a wall height or a Have height of the webs, which is preferably greater than half the height of the heating meanders and, by means of a defined spreading of the meanders, an oblique position toward the outside corresponding to an angle of repose of the receiving grooves is forced, and heat radiation directed into the center of the radiant heater is thus achieved.
  • the meanders due to the steep inner flanks of the receiving grooves and the oblique slots of the holding elements directed towards the center of the radiant heater, have to be forced into the oblique slots of the holding elements when inserted around the webs flattened in the area of the holding elements.
  • the meanders relax in the receiving grooves and are thus captively fixed in the insulating body.
  • the webs profiled according to the invention provide an additional improvement in the thermal insulation in the opposite direction to the glass ceramic hob.
  • receiving channels are provided in the insulating body, in which the holding elements are inserted.
  • the holding elements are nested one inside the other and are provided with corresponding guide slots and overhangs.
  • the holding element located at the top in the assembly sequence is connected to the insulating body by one or more clamps, with the result that all holding elements are held securely on the insulating body.
  • profile interruptions extending down to the base of the groove are provided on the surface of the insulating body. In these areas, the heating meander is spread out and is fastened to the base of the groove by automatic clamps using metal clips.
  • the receiving channels are provided with channel recesses into which the wire bridges are laid. Furthermore, the insulating body is provided with channel widenings and the holding elements with notches for holding and underpassing the connection ends of the wire bridges.
  • the radiant heater according to the preamble of claim 1 consists, as shown in Fig. 1, of an insulating body 1 made of microporous insulating material, with its introduction into the manufacturing mold also holding elements 3 are introduced into the insulating body 1 via a shaping stamp.
  • the shaping stamp embossed in the insulating body 1 spiral grooves 6 .
  • the receiving grooves 6 are delimited by webs 5 , their inner flanks 8 facing the edge of the radiant heater, based on the illustration in FIG. 4, at an acute, almost right angle and their outer flanks 9 at an obtuse angle between 100 ° and 160 °, preferably approximately 120 ° are formed.
  • the webs 5 formed by the inner flanks 8 and outer flanks 9 are flattened in the areas in which holding elements 3 are introduced into the insulating body 1 transversely to the laying direction of the heating resistors, in such a way that their flattening down to the level of Guide the bottom 7 of the grooves 6 .
  • An approximately flat surface runs on both sides of the holding elements 3 between two opposite flats of the webs 5 of this type .
  • the aforementioned flat surfaces of the webs 5 and the approximately plane on both sides of the holding members 3 extending surfaces forming both sides of the support members 3 a free space, a simple and not to allow the retaining elements 3 incriminating inserting the meandering heating element 2 in the slots 4 of the holding members.
  • the flats and their distances from each other and thus the resulting free space next to the holding elements 3 are selected depending on the heating resistors provided and their required assembly play.
  • the height of the webs 5 delimiting the grooves 6 is expediently such that it is preferably greater than half the height of the heating resistor.
  • the holding elements 3 embedded in these during the production of the insulating body 1 are chosen to be relatively thin in their material thickness, consequently they do not hinder the heat radiation in the direction of the glass ceramic cooking surface and are preferably made from mica.
  • the holding elements 3 as can be seen from FIG. 2 and in an enlarged representation from FIG. 4, have oblique slots 4 , the upper edges of which are expediently chamfered.
  • the Slits 4 run obliquely, with their opening facing the center of the radiant heater.
  • the holding elements 3 are introduced into the insulating body 1 in such a way that the centers of the oblique slots 4 of the holding elements 3 and the centers of the groove base 7 of the receiving grooves 6 cross on the groove base 7 .
  • Heating meanders 2 are used as heating resistors, which are spread at defined intervals before their assembly, which correspond to the respective distance between two holding elements 3 of the heating meanders 2 laid in arches (FIG. 3).
  • the spreading 10 of two adjacent arches or waves of the heating meanders 2 in conjunction with the outer flanks 9, causes their inclined position and thus also guarantees a low-contact fit in the slots 4 of the holding elements 3 .
  • a manually performed spreading 10 of the heating meanders 2 at the positions of the holding elements 3 during the insertion process lies in the area according to the invention. Due to the steep inner flanks 8 of the receiving grooves 6 and the oblique, inward slits 4 of the holding elements 3 , the heating meanders 2 must be forced into the oblique slots 4 of the holding elements 3 when inserted around the webs 5 flattened in the area of the holding elements 3 . After reaching the slot end and thus also the bottom of the groove 7 , the heating meanders 2 relax in the receiving grooves 6 and are thus captively fixed on the insulating body 1 .
  • the flat design of the heating meanders 2 in connection with the forced inclined position in the profiled insulating body 1 allows a large number of preferably spiral revolutions and thus ensures a homogeneous heat radiation from the heating meanders 2 in the direction of the glass ceramic cooking surface.
  • the webs 5 supporting the heating meanders 2 provide an additional improvement in the thermal insulation in the opposite direction to the glass ceramic cooking surface. Additional spreads 10 , which are not used for holding, but only for generating a defined inclined position of the heating meanders 2 in the insulating body 1 , are conceivable and are within the scope of the invention.
  • the radiant heater shown in Figure 5 consists of an insulating body 1 made of preferably microporous insulating material and is provided with spirally arranged grooves 6 for the heating meander 2 .
  • the receiving grooves 6 and webs 5 are interrupted by the intersecting receiving channels 11 for the holding elements 3 and partially by the profile interruptions 19 .
  • the receiving channels 11 are provided in sections with channel recesses 12 , in order here, under the holding elements 3, the wire bridges 13 ; 14 to record, the angled, obliquely upward connection ends are received in the channel widenings 18 of the receiving channels 11 .
  • Figure 6 shows the section DD of a radiant heater according to FIG 5 in the assembled state, with the slots 4 of the holding members 3 - because of better recognizability - not shown meandering heating element 2 and the holding members 3 arranged wire bridges 13. 14 .
  • For assembly 7 are in order, as shown in Fig., On the insulating body 1, the jumper wire 13, perpendicular to the section DD to be arranged holding element 3, the jumper wire 14 and a next support member 3 in the guide slot 16 of the already assembled retaining element 3 is inserted and a Holding element 3 provided with a projection 21 is introduced into the remaining guide slot 16 and by means of clips 15 both the mounted holding elements 3 and inserted wire bridges 13 ; 14 non-positively with the insulating body 1 a tight fit.
  • the heating meanders 2 are inserted, as described in the exemplary embodiment 1, into the receiving groove 6 except for the groove base 7 between the inner flank 8 and the outer flank 9 .
  • the captivity of all assembled is Components reached and thus the prerequisite for the installation of the Edelfeldander 2 created.
  • the heating meanders 2, which are made of round or flat material, are spread out before being inserted into the receiving grooves 6 of the insulating body 1 and the slots 4 of the holding elements 3 in the same way as described in exemplary embodiment 1.
  • the heating meanders 2 are designed to be very unstable, they are additionally fixed on the groove base 7 in the profile interruptions 19 by brackets 15 , as shown in FIG. 9. Automatic stapling is possible without additional manual work because the insulating body 1, in addition to the receiving channels 11, is additionally provided with number and length of profile interruptions 19 that extend to the bottom of the groove 7 and the heating meanders 2 spread at the relevant positions before they are installed 10 received at a defined distance.
  • the wire bridges 13 ; 14 are connected to electrical supply lines before the fiber ring 20 is put on. So that no additional assembly locks are necessary for this purpose, as shown in FIG. 8, the angled ends of the wire bridges 13 ; 14 due to the diameter of the wire bridges 13 ; 14 corresponding notches 17 firmly locked in the channel widening 18 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP94250229A 1993-09-21 1994-09-20 Strahlungsheizkörper für Glaskeramikkochflächen Withdrawn EP0644708A2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19934332884 DE4332884A1 (de) 1993-09-21 1993-09-21 Strahlungsheizkörper für Glaskeramikkochflächen
DE4332884 1993-09-21
DE4410210A DE4410210A1 (de) 1993-09-21 1994-03-24 Strahlungsheizkörper für Glaskeramikkochflächen
DE4410210 1994-03-24

Publications (2)

Publication Number Publication Date
EP0644708A2 true EP0644708A2 (de) 1995-03-22
EP0644708A3 EP0644708A3 (enExample) 1995-04-19

Family

ID=25929951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94250229A Withdrawn EP0644708A2 (de) 1993-09-21 1994-09-20 Strahlungsheizkörper für Glaskeramikkochflächen

Country Status (1)

Country Link
EP (1) EP0644708A2 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729291A3 (de) * 1995-02-21 1999-04-21 Elektrowärme Belzig GmbH Strahlungsheizkörper
EP0948239A3 (en) * 1998-04-01 2000-04-19 Ceramaspeed Limited Base for an electric heater and method of manufacture
CN104930487A (zh) * 2015-07-02 2015-09-23 朱建新 高电压可调式电锅炉

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE808859C (de) * 1948-10-02 1951-07-19 Siemens Schuckertwerke A G Rillenplatte aus keramischen Baustoffen o. dgl. fuer elektrische Kocher
US3346721A (en) * 1965-02-01 1967-10-10 Gen Motors Corp Radiant heater with improved seal assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729291A3 (de) * 1995-02-21 1999-04-21 Elektrowärme Belzig GmbH Strahlungsheizkörper
EP0948239A3 (en) * 1998-04-01 2000-04-19 Ceramaspeed Limited Base for an electric heater and method of manufacture
CN104930487A (zh) * 2015-07-02 2015-09-23 朱建新 高电压可调式电锅炉

Also Published As

Publication number Publication date
EP0644708A3 (enExample) 1995-04-19

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