EP0892583A2 - Conducteurs chauffants pour corps de chauffe rayonnant dans plaque de cuisson - Google Patents

Conducteurs chauffants pour corps de chauffe rayonnant dans plaque de cuisson Download PDF

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Publication number
EP0892583A2
EP0892583A2 EP98113055A EP98113055A EP0892583A2 EP 0892583 A2 EP0892583 A2 EP 0892583A2 EP 98113055 A EP98113055 A EP 98113055A EP 98113055 A EP98113055 A EP 98113055A EP 0892583 A2 EP0892583 A2 EP 0892583A2
Authority
EP
European Patent Office
Prior art keywords
heating
heating conductor
conductor according
retaining
webs
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Withdrawn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
EP98113055A
Other languages
German (de)
English (en)
Other versions
EP0892583A3 (fr
Inventor
Norbert Mörsch
Jörg Meyer
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.)
Diehl AKO Stiftung and Co KG
Original Assignee
AKO Werke GmbH and Co 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
Priority claimed from DE19737194A external-priority patent/DE19737194A1/de
Application filed by AKO Werke GmbH and Co KG filed Critical AKO Werke GmbH and Co KG
Publication of EP0892583A2 publication Critical patent/EP0892583A2/fr
Publication of EP0892583A3 publication Critical patent/EP0892583A3/fr
Withdrawn legal-status Critical Current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 heating conductor for radiant heaters of a hob according to the preamble of claim 1.
  • Heating conductors consisting of a flat strip are already in DE 42 29 375 A1 and disclosed in EP 0 585 538 A2.
  • the desired geometric pattern of the heat conductor formed by that Flat ribbon in corresponding turns on an insulating base of the radiant heater is relocated.
  • the large surfaces of the adjacent ribbon sections are facing each other, while the hob itself is narrow Edges of the ribbon are trimmed.
  • This means that one in one geometric pattern laid flat tape stands up on its high edge and thanks to special clip technology on the insulating base of the radiant heater is to be attached.
  • Form the brackets in short intervals Sections of low electrical resistance, which is negative on the glow pattern noticeable. Since the heat radiation is essentially to the side of the Flat ribbon takes place, there is no direct radiation heating. Because that Narrow edges facing the hob cover only a very small part of the Cooktop.
  • EP 0 175 662 B1 discloses a heating conductor with a geometric pattern, which is formed by stamping from a metal foil. This heating conductor is suitable however only for temperatures up to a maximum of 400 ° C and is therefore only for one Radiant heaters cannot be used. Such a heating conductor is used in vehicle seats installed where a bendability of the heating conductor is not desired.
  • the heating elements are created with the individual solution features, the heating elements reveal in different arrangement and interpretation. Furthermore, a Variety of retaining tabs for the heating bars are presented, which allow such Heating webs in a technically simple manner in the radiant heater with precise position to fix. It is an essential feature of the inventive solutions, that the new heating conductors with the molded retaining tabs are industrial and in Large series can be manufactured and assembled in radiant heaters.
  • heating conductor for a radiant heater of a hob which consists of individual
  • the heating elements are made from the Cut out metal foil so that different variations depending on the specifications of geometric patterns in the top view. These heating bars will be with their wide surfaces, i.e. with the top view of the geometric pattern aligned to the hob, which ensures optimal, direct radiation heating he follows.
  • the high temperatures that occur in the heating elements cause a Thermal expansion of the heating webs, which is technical due to special types of fastening is easy and effective to catch.
  • the endpoints become rigid with connected to the base, the longitudinal expansion has an effect by sagging or bending the foils.
  • FIG 1 is a top view of the retaining tab 1 for two parallel side by side Heating bars 2 shown.
  • a fastening tab 3 is from the holding tab 1 so punched out that it from the plane of the retaining tab 1 around a bending edge 4 can be turned.
  • the attachment of fastening tabs 3 with the holding part 5 takes place in that a Stamp 6 with three cutting and one rounded edge the mounting tab 3 from the retaining tab 1 and at the same time from the underlying Holding part 5 cuts three edges.
  • Umbiegest Zi 7 which from below against the mounting tab with separated Holding part 5 is driven, the holding part 5 is bent together with the mounting tab 3 in the manner shown in Figure 2.
  • the bent The fastening tab encloses an angle of ⁇ 90 °.
  • the mounting tab 3 accordingly encompasses the resulting edge of the window 8 with a Angle between 0 ° and 90 °.
  • the retaining tab 1 prevents lifting fixed.
  • the contour of the fastening tab 3 can be chosen as desired and also arise during the manufacture of the foil geometry of the metal foil.
  • the contour of the fastening tab 3 can alternatively with the outer contour of the Retaining tab 1 be identical.
  • a passage 9 is integrally formed on the retaining tab 1.
  • This Passage 9 consists essentially of a hollow cylindrical body of any but in particular circular cross-section, which in a corresponding Opening 10 of the holding part 5 is used.
  • the passage is flanged by appropriate tools, so that a firm Connection of the retaining tab 1 with the heating webs 2 in the holding part 5 is carried out ( Figure 4).
  • FIG. 5 shows a section through an insulating ring 13, which is conventional and known Construction on an insulating floor 20 ( Figure 10) can be placed.
  • annular groove 12 is introduced, which essentially has a rectangular cross section.
  • the outer wall of the annular groove 12 can preferably run obliquely, whereby a narrower than the opening Groove bottom is created.
  • a retaining tab 1 of a heating web 2 used in this annular groove 12 .
  • the retaining tab 1 has an essentially Z-shape and thereby engages self-locking in the annular groove 12. Instead of the Z shape are for the retaining tab 1 Of course, other shapes are possible.
  • Ring groove 12 also a single recess or several in a row next to each other Recesses possible into which the end piece 11 of the retaining tab 1 is inserted is.
  • the shape of the end piece 11 of the retaining tab can be before assembly respectively; but it can also during the assembly process by pressing Retaining tabs 1 in the annular groove 12 (recess) by means of a suitable ring stamp happen.
  • the insulating ring 13 connecting, diagonal web 14 ( Figure 6) is also provided the retaining tab 1, which ends at this diagonal web 14, has a Z-shaped shape received and engage in a recess or groove, as in an equivalent Form Figure 6 shows.
  • heating webs 2 are provided, which between an insulating ring 13 and a Diagonal web 14 of an insulating floor are used.
  • they are Holding tabs in the top view are dovetailed and engage in corresponding shapes of the insulating ring 13 and the diagonal web 14.
  • the retaining tabs 1 can also be rectangular or be shaped differently and have an opening 15. So the retaining tabs 1 with their foreheads angled down (or up), causing them to just like the drawn dovetail shape claw in the material.
  • the holding tabs are expediently in the powdered starting material inserted, which is then pressed by a lower and upper tool. So can put the ends of the retaining tabs 1 in the molding process and then be surrounded by the crowd.
  • FIG. 8 Another type of attachment is shown in Figure 8.
  • insert tabs 16 which are in the left Version of Figure 8 as a trapezoid and in the right version of Figure 8 are cut out in a semicircular shape.
  • insert tabs 16 are against one Detaching from the holding part 5 secured by being essentially arrow-shaped are designed with an insertion bevel and barbs.
  • the neck 17 of the insertion tabs 16 is the same width as or narrower than a corresponding window 18 in the holding part 5.
  • the widest point of the insertion tab 16 is, however, slight, for example 0.2 to 1 mm, wider than the window 18. When inserting therefore cuts the insertion tab somewhat into the holding part 5 and is thereby slightly deformed.
  • the widened area prevents the action of barbs a detachment of the insertion tabs 16 from the Window 18 of the holding part 5.
  • the widened area or the barbs of the insertion tabs 16 can also be angled after insertion into the window 18, which ultimately leads to a positive inhibition.
  • the retaining tabs 1 are extended in continuation of the heating webs 2 and through openings 19 of the holding part 5 and in the direction back to the Heating bars 2 angled.
  • This design creates an additional heating conductor surface won.
  • the heating conductor temperature is thereby for the entire Heating conductor lowered so that the radiant heater with a higher overall electrical power can be equipped.
  • the inserted through the openings 19 and angled ends of the retaining tabs 1 are to the end or flowed through to near the outer end of the current and switched on Glowing condition.
  • FIG 10 it is shown that a heating web 2 of a heating conductor of the one-piece Ring part of an insulating base 20 out to the one-piece diagonal web 14 is.
  • the retaining tabs 1 are by one or more of the ways described above fixed in the holding part 5 or in the insulating ring 13.
  • the heating elements 2 will be hot Supported area with a suitable support part 21. Will this support position from part of the insulation or from a poorly heat-conducting component is formed, then the bearing surface of a hot heating web 2 on the support part 21st advantageously small in order not to significantly increase the heat dissipation of the heating web 2 hinder.
  • a small contact area is, for example, by a line or achieved by a point support.
  • the support member 21 is formed from a material that has good thermal conductivity having.
  • the supporting part 21 conducts the heat of the heating conductor over the contact surface and thus prevents the heating conductor from overheating at the support point.
  • a suitable design of the support part 21 gives the absorbed energy to the interior of the radiator.
  • quartz glass or ceramics are particularly suitable.
  • FIG. 11 Another type of attachment offers a U-shaped bracket 22, which according to Figure 11 shot through the holding tab 1 and the holding part 5 located below and is angled at the ends of the exit point. If that Holding part 5 is annular or with a diagonal web 14, then can the outer and inner retaining tabs 1 in the same way in the insulating ring 13 are attached.
  • the retaining tab can also be replaced by a clip according to FIG Rivet 23 can be connected to the holding part 5. Furthermore, nails, Screws or similar fasteners for holding the retaining tab 1 be used on the holding part 5.
  • Figure 13 shows the attachment of the retaining tabs 1 by clips 22 directly the annular edge or insulating ring 13 and the diagonal web 14 of the insulating base 20 of the radiant heater.
  • the holding tabs 1 form in a known manner and, as described above, the one-sided connection of at least two parallel heating webs 2.
  • the area of the retaining tab 1, which the electrical connection of the represents two adjacent heating bars, is in most possible Glow patterns a critical area. Since the flow of electrons strives, one Following the path of the least electrical resistance arises on the inside a turn 24 by concentrating the current flow a point local Overheating of the heating conductor. Such overheating can be damaging to the Impact heating conductor structure.
  • the large heat gradient within the retaining tab 1 also causes thermal stresses that lead to cracking in the Can lead heating web 2 or in the retaining tab 1.
  • Figure 14 shows the example of a simple retaining tab 1 with two connected Heating element 2 without special measures to prevent overheating.
  • Figure 15 now shows an enlarged surface of the retaining tab 1 by one-sided Widening of the heating webs 2 from about the transition of the heating webs 2 to Retaining tab 1.
  • This widening 25 in the radial outer direction from the bend 24 leads to the current flow from the heating webs 2 in the area of the retaining tab 1 is shifted somewhat to the outside.
  • An extended hairpin bend 24 with an increase in the hairpin bend radius according to FIG. 16 reduces the difference in resistance between the innermost and a more distant one imaginary current path around the retaining tab 1.
  • the concentration of the Current flow at the inner edge of the turn 24 thus decreases significantly.
  • This embodiment according to FIG. 16 is advantageous in combination with the widening 25 according to FIG. 15.
  • Cooling vane 26 that heat directly from the area of highest energy density dissipates.
  • Cooling vanes can be provided along the inside contour of the bends. Such a cooling vane 26 can remain in the plane of the retaining tab or up or down be angled.
  • Figure 18 shows that the bend 24 of the retaining tab 1 geometrically into an inner 27 and is divided into an outer current path 28.
  • the inner Current path 27 still artificially extended by an additional meander.
  • the overall reduction in heat dissipation within a retaining tab 1 a homogeneous temperature distribution in the area of the bend 24.
  • the temperature gradient decreases and there are hardly any temperature-related tensions in the entire heating conductor with heating bars 2 and retaining tabs 1.
  • the retaining tab 1 according to FIG. 19 is to be reduced at its front end executed with a tapered or narrowed end tab 29.
  • Such tapered end tab 29 also conducts heat by means of tailored incisions 30 or through a row of holes 31 with several arranged one behind the other Breakthroughs reduced.
  • the retaining tab geometry can also by a combination of the measure described in FIGS. 19, 20 and 21 consist.
  • heating webs 2 with holding tabs 1 made of a metal foil by etching on both sides there is basically the possibility of such heating webs 2 to be made thinner than the retaining tabs 1 with the bends 24.
  • the metal foil is etched for this purpose in the area of the heating webs 2 from one side.
  • the heating webs 2 By embossing the heating webs 2 or by rolling the metal foil partially thinner in the area of the heating webs 2 there is a difference in thickness between the heating webs 2 and reached the retaining tabs 1.
  • the retaining tabs 1 then remain in the original Material thickness of, for example, 0.12 mm of the metal foil.
  • the heating bars 2 in contrast, are reduced to a material thickness of approximately 0.06 mm.
  • Such Heating webs 2 are at their end, where the greatest bending stress occurs, more stable. The problem of overheating bends described above is alleviated because the hairpin bends now have a relatively thick material
  • the described positive effect can also be achieved in that the hairpin bends 24 by a corresponding material application, for example galvanically or cross-section can be reinforced by laser cladding.
  • the surface of the heating webs 2 that radiates heat in the direction of the hob is enlarged in accordance with FIG. 22 in that on the side facing the hob Surface grooves 32 are etched or stamped in front of the End area, i.e. end before the hairpin bends.
  • the sweeping area has one thicker material cross section and the points of the hairpin 24 heat up significantly less, which increases the durability of the heating conductor as a whole.
  • FIG. 23 to 26 describe an increase in the resistance of the heating webs 2 by reducing the resulting cross section, for example created by introducing a hole pattern. This generally causes an extension the current paths in the heating webs 2. Through such perforations additionally the heat-radiating surface increased. The heating webs 2 fall wider than usual and the total heating conductor length decreases. As a result the entire heating conductor geometry consists of just a few webs, which also means less dead space means that is required for safety distances. By this measure there is again an enlarged heatable surface available, which the Heating conductor temperature lowers. According to FIG. 23 there are approximately oval holes 33 or openings provided in the heating web 2. The holes 34 in the heating web 2 according to FIG. 24 on the other hand have an essentially rectangular cross section.
  • FIG. 26 there are 2 incisions 36 in the heating web, the cutting edges of which 37 are slightly bent up or down.
  • they can Holes and recesses in the heating elements also have other cross sections, for example take square, diamond-shaped or similar suitable shapes.
  • the holes can be designed as through openings or else only form recesses 35, for example, etched on one side.
  • Cooling vanes 38 that run along the outer edges the heating webs 2 are provided, lower the heating conductor temperature.
  • the cooling vanes 38 advantageously angled upwards or downwards, as shown in FIG 27 is shown.
  • the heating webs 2 at different heights can be arranged above or below one another.
  • the heating bars arranged at different heights As a rule, 2 do not form a surface as dense as with a simple flat arrangement.
  • the convection in the interior of the radiant heater favors what is also an improved removal of the resulting at the heating web 2 Means warmth.
  • the different height arrangement can change the mounting positions the retaining tabs 1 both in the edge area 13 and in the interior 14 concern. This arrangement in different heights can also be used the advantageous arrangement possibilities of the heating webs 2 described above be combined.
  • the heating webs 2 can also be arranged at different heights Arrangement of two or more heating elements in two or more different ones Heating conductor levels can be realized.
  • Such a structure offers significant advantages for Radiant radiators with high performance and a high power density.
  • the metal foil is on one side advantageously a self-adhesive and even before the etching process etched plastic film laminated.
  • the metal foil for the later heating conductor is then only coated on one side with etching resist and only etched on one side.
  • the laminated holding film remains on the etched holding film until this is securely mounted in the radiant heater using fastening measures.
  • Thin cross-connecting webs 39 run on the outer retaining tabs 1 up to the starting strip material 40 for the production of the heating conductor from a Metal foil. With this manufacturing process, the heat conductor geometry remains in the Output belt until the stability and position securing of the Heating conductor is guaranteed. This means that the metal foils after the etching or punching in coherent band 40 or cut accordingly Bows can be handled. During or after completion such connections to the strip mechanically, chemically, by laser beam or electrically isolated and the tape waste removed.
  • the profile protruding from the contact lug 41 can take the form of a bead or have several beads 42.
  • the profile can be in the form of a or several warts 43 in a different arrangement to one another or by others Cross-sectional shapes, for example triangular or rectangular impressions 44 be trained.
  • the profiles are each about 0.1 to 0.5 mm above the surface the contact flag 41 over.
  • the profile top edges can be parallel to the surface of the Contact flags 41 run. However, it is advantageous to have one towards the radiator sloping slope or different heights to provide the desired To obtain zones of different melt flow.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP98113055A 1997-07-15 1998-07-14 Conducteurs chauffants pour corps de chauffe rayonnant dans plaque de cuisson Withdrawn EP0892583A3 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19730192 1997-07-15
DE19730192 1997-07-15
DE19737194 1997-08-27
DE19737194A DE19737194A1 (de) 1997-07-15 1997-08-27 Heizleiter für Strahlungsheizkörper eines Kochfeldes
US09/089,896 US6051817A (en) 1997-07-15 1998-06-03 Heating conductor for radiant heating bodies of a cooking hob

Publications (2)

Publication Number Publication Date
EP0892583A2 true EP0892583A2 (fr) 1999-01-20
EP0892583A3 EP0892583A3 (fr) 1999-06-23

Family

ID=27217537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98113055A Withdrawn EP0892583A3 (fr) 1997-07-15 1998-07-14 Conducteurs chauffants pour corps de chauffe rayonnant dans plaque de cuisson

Country Status (4)

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US (1) US6051817A (fr)
EP (1) EP0892583A3 (fr)
CZ (1) CZ169298A3 (fr)
PL (1) PL326832A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2789609B1 (fr) * 1999-02-16 2001-04-27 Armor Inox Sa Procede d'assemblage de toles et structure rigide obtenue par ledit procede
DE20019210U1 (de) * 2000-11-11 2001-01-25 Schott Glas Kochfeld
KR102143261B1 (ko) * 2016-04-01 2020-08-10 주식회사 엘지화학 잉크 조성물, 이로 제조된 경화 패턴, 이를 포함하는 발열체 및 이의 제조방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2111556A5 (fr) * 1970-10-23 1972-06-02 Licentia Gmbh
GB1355693A (en) * 1970-08-27 1974-06-05 Ego Verwaltungs Gmbh Electrical heating elements
US4034206A (en) * 1976-05-11 1977-07-05 Gould Inc. Range top element
EP0355210A1 (fr) * 1988-08-26 1990-02-28 Koninklijke Philips Electronics N.V. Elément chauffant

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE175662C (fr) *
DE229928C (fr) *
US3567906A (en) * 1969-04-14 1971-03-02 Gen Electric Planar surface heater with integral fasteners for heating element
DE2551137C2 (de) * 1975-11-14 1986-04-24 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer Strahlungsheizkörper für Glaskeramikkochplatten
DE4229375C2 (de) * 1992-09-03 2000-05-04 Ego Elektro Blanc & Fischer Strahlungs-Heizkörper
DE19506685A1 (de) * 1995-02-25 1996-08-29 Ego Elektro Blanc & Fischer Elektrischer Strahlungsheizkörper und Verfahren zu seiner Herstellung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1355693A (en) * 1970-08-27 1974-06-05 Ego Verwaltungs Gmbh Electrical heating elements
FR2111556A5 (fr) * 1970-10-23 1972-06-02 Licentia Gmbh
US4034206A (en) * 1976-05-11 1977-07-05 Gould Inc. Range top element
EP0355210A1 (fr) * 1988-08-26 1990-02-28 Koninklijke Philips Electronics N.V. Elément chauffant

Also Published As

Publication number Publication date
EP0892583A3 (fr) 1999-06-23
PL326832A1 (en) 1999-01-18
CZ169298A3 (cs) 1999-02-17
US6051817A (en) 2000-04-18

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