EP0015490B1 - Elément chauffant électrique - Google Patents

Elément chauffant électrique Download PDF

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Publication number
EP0015490B1
EP0015490B1 EP80100960A EP80100960A EP0015490B1 EP 0015490 B1 EP0015490 B1 EP 0015490B1 EP 80100960 A EP80100960 A EP 80100960A EP 80100960 A EP80100960 A EP 80100960A EP 0015490 B1 EP0015490 B1 EP 0015490B1
Authority
EP
European Patent Office
Prior art keywords
heating element
heating
element according
preceeding
space
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
EP80100960A
Other languages
German (de)
English (en)
Other versions
EP0015490A1 (fr
Inventor
Karl Fischer
Gerhard Gössler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT80100960T priority Critical patent/ATE3489T1/de
Publication of EP0015490A1 publication Critical patent/EP0015490A1/fr
Application granted granted Critical
Publication of EP0015490B1 publication Critical patent/EP0015490B1/fr
Expired legal-status Critical Current

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    • 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
    • H05B3/688—Fabrication of the plates
    • 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
    • H05B3/72—Plates of sheet metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53191—Means to apply vacuum directly to position or hold work part

Definitions

  • the invention relates to an electric heating element for heating food or the like. with an upper part made of metal, the upper side of which forms a cooking surface, a metallic lower part covering the underside of the heating element, a space formed between the upper part and the lower part, and at least one tubular heating element with a metallic jacket arranged in the space, which has a flattened large contact surface has to the underside of the upper part and is applied to the underside of the upper part in a thermally conductive connection.
  • the usual hot plates with a cast body with heating coils inserted in grooves on the underside in investment material have a good efficiency in the stationary state and many advantages in use.
  • the aim here is to further improve them while maintaining their advantages in the direction of a lower heat capacity and lower weight or less material consumption.
  • the vacuum is used to place the tubular heater on the underside of the upper part, which is without grooves and essentially smooth.
  • the invention provides an electric heating element that enables good heat transfer from the tubular heater to the food. Due to the relatively low mass of the upper and lower part, which can consist of sheet metal, for example stainless steel sheet, the heat capacity is very low, so that the efficiency is good both in stationary and in intermittent operation.
  • the heating element according to the invention can also be designed such that the upper part directly forms a container wall, for example that of an electric kettle.
  • the air pressure which acts on the evacuated space in conjunction with a resilient design of the upper and / or lower part, ensures that the tubular heater is thermally conductive to the underside of the upper part Contact is created. It is also possible to insert insulation between the tubular heater and the lower part. It is also advantageous to have the tubular heating element supported on an internal support plate if the upper part is flexible. Despite a very flexible and adaptable upper part, this ensures that the tubular heating element spiral provided in most cases remains flat and level.
  • the electric heating element 11 shown in Fig. 1 is made of stainless steel sheet (0.3 to 0.6 mm thick) and has an upper part 12, which has a flat, annular heating surface 13, a circumferential laterally shaped flange 14, a downwardly directed annular edge 15 and an inner, also annular rim 16 contains.
  • a cylindrical sleeve 20 is inserted, which has an upper and lower flange and can accommodate a temperature sensor socket, for example the movable sensor socket 40 of an automatic temperature controller 41.
  • a sheet metal ring 21 is supported against the flange 14 and forms an overhang edge 21 which is supported on a hotplate or hob 44.
  • tubular heating elements 23 are arranged in a spiral.
  • the tubular heaters have a metallic jacket and heating resistors lying in an embedding.
  • the jacket is deformed in a triangular shape, so that the tubular heating elements 23 lie with their upper, essentially flat triangular side against the heating surface 12 from the inside, while they only have a linear contact on the lower part in the area of the triangular corner.
  • the tubular heating elements 43 are sealed through a downwardly directed grommet 42 of the lower part.
  • the upper and lower parts are connected by soldering on the vacuum.
  • soldering on the vacuum.
  • a solder foil is placed between the sheet metal parts or a solder powder is sprinkled, and after the space 22 has been evacuated, the soldering is carried out by heating the unit.
  • the heating can also take place inductively. This creates a very stable hotplate that does not tend to warp.
  • FIG. 2 shows an embodiment in which a wart-shaped, upwardly directed formation 24 is provided in the lower part 17 ', which ensures a spacing between the upper and lower parts during soldering.
  • the support elements 24 can also be provided in the upper part or in the upper and lower part.
  • the outer flange 14 had a lower, essentially flat surface and an adjoining bevel which leads to the cooking surface 13.
  • the flange is formed as a bend in the sheet of the heating surface by 180 °. This flange can rest on the surface of the cooktop either directly or with an overflow edge.
  • inwardly directed embossments 26 are provided both in the upper and lower part, each lying between the tubular heating elements and therefore normally forming a spiral pattern on the upper and lower sides. These impressions stiffen the surfaces on the one hand, but allow expansion in the radial direction.
  • the embodiment according to FIG. 4 also has impressions 26, but only in the area of the upper part.
  • the flange 14 ' is directed outwards and obliquely downwards and consists of the soldered or welded edges of the upper and lower part 12 ", 17". As a result, it forms the rim itself.
  • FIG. 5 shows a heating element 11b which corresponds in its basic structure to that according to FIG. 1.
  • both the upper part 12b and the lower part 17b are spherically curved, so that the cooking surface 13b has a concave shape.
  • a cooking vessel 36 with a curved bottom for example a Chinese wok, can be guided in this.
  • the curved design creates additional stiffening.
  • a medium sensor socket is used, with the medium sensor opening ensuring additional cohesion between the upper and lower part.
  • a kettle 31 which has a vessel 32 with a lid and spout and a bottom 33 which is formed by the upper part 12a of the heating element, which is received in a housing 34 in the form of an upwardly open bowl, the stands on feet.
  • the upper part 12a forms the vessel wall or the vessel bottom, while the lower part 17a is soldered to it.
  • the cover and the heating surface face upwards.
  • the tubular heating elements 23 are soldered in under vacuum.
  • the unit comprising the vessel and the heating element is fastened to the housing 34 by a screw bolt 35.
  • FIG. 7 shows a particularly preferred embodiment of an electric heating element in which the upper part 12c consists of a very thin sheet of stainless steel in the order of magnitude of 0.2 to 0.3 mm thickness.
  • This sheet has flat areas which form the actual cooking surface 13c and are in flat contact from below with the spirally arranged tubular heaters 23 with a triangular cross section. Depressions 26c are embossed between the heating surface areas 13c, which increase the flexibility and flexibility of the thin upper part.
  • the upper part is directed obliquely downwards in a bowl-like manner and is provided with a flange 50 around the outer edge 51 of the lower part 17c, which is also directed downward. In this area the two parts are tightly soldered or welded together.
  • the lower part 17c consists of much thicker sheet metal material and forms a stable carrier shell. It engages with the edge 14c over an upward edge of the hotplate 44c and is fastened to the hotplate 44c by a bracket 52 and a central bolt 53 welded into the lower part 17c.
  • an insulation layer 54 is arranged, which can consist of any heat-resistant, solid, fibrous or granulated insulation material, which is preferably deformed into the shape of a disk.
  • An inorganic fiber material known under the trademark “Fiberfrax” is preferred.
  • a supporting plate 55 made of metal or a rigid insulating material lies on the insulating material 54. Support on the flat support plate 55 the lower apex of the triangular tubular heater 23.
  • a tubular suction nozzle 56 is inserted in the edge area, which protrudes into the space 22c formed around the radiators.
  • the space 22c between the upper and lower part is evacuated via the suction connection 56.
  • the suction nozzle is then squeezed off at its lower end 57 and soldered or welded tightly so that the vacuum is maintained.
  • the relatively thin, membrane-like upper part 12c is pressed down by the atmospheric pressure and presses itself onto the tubular heating elements 23, which in turn are pressed onto the plate 55, which is supported on the lower part 17c via the insulating layer 54.
  • a very soft insulating layer for example consisting of granules, it would also be possible to connect the support plate 55 to the lower part 17c by means of supports, but as little thermal bridges as possible to the lower part should be created.
  • the lower part 17c ensures a sufficient load-bearing effect, the insulation towards the underside is excellent, and the contact of the tubular heating elements with the membrane-like upper part is always maintained by the effect of the air pressure.
  • the support plate ensures a flat surface, although the upper part itself is flexible.
  • the vacuum contributes to the good insulation to the bottom.
  • the mass to be heated when heating is very low. It consists practically only of the tubular radiators and the very thin upper part. A very low-capacity hotplate with the best insulation downwards is thus created, which delivers good efficiencies in both stationary and intermittent operation.
  • the cooking surface is closed, easy to clean and the food cannot pass through.
  • Fig. 8 shows an embodiment in which the heating element is the same as in Fig. 7 except for the edge design. It is arranged in a hob which consists of a hob 44d and a bowl-shaped depression 58 formed therein, in which the heating element is arranged. Because of the diagonally widening walls of the trough 58, the edge 14d of the heating element is also conically widening, in contrast to FIG. 7, with the same connection between the upper part and the lower part, so that the heating element fits into the trough 58 .
  • FIG. 9 shows an embodiment which has an upper part 12e consisting of somewhat thicker sheet metal of 1 to 2.5 mm thickness, the upper side of which forms a flat cooking surface 13e.
  • edges 50e are tapered downwards and surround an upward edge of a hotplate 44e.
  • the edge 50e is tightly connected to a lower part 17e, which is made in the form of a thin corrugated and resilient metal membrane made of very thin-walled sheet metal (0.2 to 0.3 mm).
  • an insulating layer 54e lies in this bowl-shaped metal bellows.
  • the insulating layer consists of an insulating material that is stable in shape, and therefore the lower side of the tubular heating element spiral 23 lies directly on the insulating layer 54e.
  • the space 22e between the upper and lower part is evacuated, so that the resilient lower part 17e presses the insulating layer 54e against the tubular heating element under the outside air pressure and presses it flat against the underside of the upper part 12e.
  • vacuum does not have to be very high because the forces generated are usually sufficient even with a low vacuum. Due to the size of the vacuum, a certain deflection of the plate 12e towards the inside can also be determined in FIG. 9. Since normally heated cooking surfaces tend to bulge upwards, the air pressure in this case acts in the opposite direction and, with the correct dimensioning of the top part and vacuum, ensures that the evenness is maintained.
  • the heating element according to the invention can be produced easily and with a low heat capacity.
  • the heat transfer to the cooking surface is particularly good, since the radiators lie over a large area or are even soldered. In contrast, the heat losses are reduced downwards.
  • the overall construction is very rigid. The vacuum between the upper and lower part also ensures that there is no corrosion or oxidation in the interior and reduces convective heat loss.

Landscapes

  • Cookers (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Glass Compositions (AREA)

Claims (14)

1. Elément électrique chauffant pour chauffer des mets ou autres, avec une partie supérieure (12) en métal, dont la face supérieure forme une surface de cuisson (13), une partie inférieure métallique (17) recouvrant la face inférieure de l'élément chauffant, un espace (22) formé entre la partie supérieure (12) et la partie inférieure (17), et au moins un corps chauffant tubulaire (23) disposé dans l'espace (22), avec une enveloppe métallique qui a une grande surface de contact aplatie avec la face inférieure de la partie supérieure (12) et est appliquée en liaison thermoconductrice contre la face inférieure de la partie supérieure (12), caractérisé par le fait que l'espace (22) est sous vide, et que les parties supérieure et/ou inférieure (12, 17) sont assez souples pour que, sous l'action de la pression atmosphérique agissant sur l'espace (22) mis sous vide, elles pressent le ou les corps chauffants tubulaires (23) contre la face inférieure de la partie supérieure (12).
2. Elément chauffant selon la revendication 1, caractérisé par le fait que l'espace (22) logeant les corps chauffants tubulaires (23) entre la partie supérieure (12) et la partie inférieure (17) est en permanence fermé hermétiquement et mis sous vide.
3. Elément chauffant selon la revendication 1 ou 2, caractérisé par le fait que les corps chauffants (23) ont une section triangulaire et sont appliqués par un côté du triangle contre la face inférieure de la partie supérieure (12) et par une pointe du triangle contre la partie inférieure (17).
4. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'il est réalisé sous la forme d'une plaque de cuisson avec une surface de cuisson (13) sur laquelle des récipients de cuisson (36) peuvent être directement placés.
5. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la partie supérieure (12) forme une paroi de récipient, par exemple d'une bouilloire ou ustensile analogue.
6. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'il présente un rebord externe (14) qui coopère avec un évidement de la plaque de fourneau ou bien forme un rebord-déversoir (21) qui emprisonne par en dessus l'évidement de l'auge de cuisson.
7. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la partie supérieure (12) et la partie inférieure (17) possèdent, sur leur pourtour et éventuellement dans la région d'un évidement central, des bords respectifs dirigés vers le bas et solidarisés par brasage ou par soudage.
8. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que des éléments d'appui (24), de préférence en forme de godet, traversent l'espace (22) logeant les corps chauffants tubulaires.
9. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que, dans la partie supérieure (12) et/ou dans la partie inférieure (17), dans les zones situées entre les éléments chauffants (23), sont ménagées des empreintes (26), de préférence spiroïdales ou périphériques.
10. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la sortie des corps chauffants (23) hors de l'espace (22) est assurée par des passages (42), en forme de douille, de la partie inférieure (17), et que les corps chauffants (23) sont brasés ou soudés hermétiquement sur les bords des douilles.
11. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que les parties supérieure et/ou inférieure (12, 17) consistent en une tôle mince.
12. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la liaison étanche a lieu à proximité du rebord externe (14c, 14d), et que les parties supérieure et inférieure (12, 17) sont solidarisées à cet endroit par une bordure.
13. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la partie supérieure ou inférieure (12c, 17e) est réalisée à paroi mince à la manière d'une membrane avec des zones de dilatation, et que l'autre partie (17c, 12e) est réalisée à paroi plus épaisse avec une rigidité suffisante pour supporter l'élément chauffant.
14. Elément chauffant selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'une couche d'isolation (54) recouverte de préférence par une plaque d'appui (55) est placée dans l'espace (22).
EP80100960A 1979-03-09 1980-02-27 Elément chauffant électrique Expired EP0015490B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80100960T ATE3489T1 (de) 1979-03-09 1980-02-27 Elektroheizelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792909238 DE2909238A1 (de) 1979-03-09 1979-03-09 Heizelement zum erhitzen von speisen o.dgl.
DE2909238 1979-03-09

Publications (2)

Publication Number Publication Date
EP0015490A1 EP0015490A1 (fr) 1980-09-17
EP0015490B1 true EP0015490B1 (fr) 1983-05-18

Family

ID=6064911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100960A Expired EP0015490B1 (fr) 1979-03-09 1980-02-27 Elément chauffant électrique

Country Status (13)

Country Link
US (1) US4431908A (fr)
EP (1) EP0015490B1 (fr)
JP (1) JPS55126993A (fr)
AT (1) ATE3489T1 (fr)
AU (1) AU537856B2 (fr)
DE (2) DE2909238A1 (fr)
DK (1) DK99580A (fr)
ES (1) ES489303A1 (fr)
FI (1) FI66270C (fr)
GR (1) GR66798B (fr)
NO (1) NO800648L (fr)
YU (1) YU64980A (fr)
ZA (1) ZA801302B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3221347A1 (de) 1982-06-05 1984-01-05 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Heizelement zur beheizung von behaeltern
DE3527533A1 (de) * 1985-08-01 1987-02-12 Ego Elektro Blanc & Fischer Elektrokochplatte
CN1076326A (zh) * 1992-03-12 1993-09-15 淄博电热电器厂 复合式电加热盘成型工艺及电加热盘
JP3020782B2 (ja) * 1993-10-18 2000-03-15 株式会社東芝 加熱調理器の平面ヒータ
US7926418B2 (en) * 2004-10-07 2011-04-19 All-Clad Metalcrafters Llc Griddle plate having a vacuum bonded cook surface
US20090152276A1 (en) * 2004-10-07 2009-06-18 All-Clad Metalcrafters Llc Griddle Plate and Cookware Having a Vacuum Bonded, High Conductivity, Low Density Carbon Foam Core Plate
US7980171B2 (en) * 2004-10-07 2011-07-19 All-Clad Metalcrafters Llc Vacuum cooking or warming appliance
US7326885B2 (en) * 2006-05-02 2008-02-05 Barnstead/Thermolyne Corporation Hot plate with stainless steel top
US7783176B2 (en) * 2007-06-28 2010-08-24 Strix Limited Heaters for liquid heating vessels
US10429079B2 (en) * 2017-02-21 2019-10-01 Zoppas Industries De Mexico S.A., De C.V. Electric stovetop heater unit with integrated temperature control
US10959573B2 (en) * 2017-11-22 2021-03-30 Jeffrey Taylor Roll-up barbeque grill

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826898A (en) * 1973-11-28 1974-07-30 Gen Electric Border treatment of composite metal plate surface heating unit

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FR815241A (fr) * 1936-03-18 1937-07-08 Alsthom Cgee Perfectionnements apportés aux foyers électriques de cuisson à feu vif
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FR908348A (fr) * 1944-12-23 1946-04-05 Perfectionnements aux plaques chauffantes électriques, notamment pour réchauds et cuisinières électriques
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Also Published As

Publication number Publication date
JPS55126993A (en) 1980-10-01
DE3063237D1 (en) 1983-07-07
NO800648L (no) 1980-09-10
DK99580A (da) 1980-09-10
AU5619580A (en) 1980-09-11
FI66270C (fi) 1984-09-10
US4431908A (en) 1984-02-14
FI66270B (fi) 1984-05-31
GR66798B (fr) 1981-04-29
EP0015490A1 (fr) 1980-09-17
FI800707A (fi) 1980-09-10
YU64980A (en) 1982-08-31
AU537856B2 (en) 1984-07-19
DE2909238A1 (de) 1980-09-11
ES489303A1 (es) 1980-08-16
ATE3489T1 (de) 1983-06-15
ZA801302B (en) 1981-08-26

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