EP0047490B1 - Elektrokochplatte - Google Patents

Elektrokochplatte Download PDF

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Publication number
EP0047490B1
EP0047490B1 EP81106869A EP81106869A EP0047490B1 EP 0047490 B1 EP0047490 B1 EP 0047490B1 EP 81106869 A EP81106869 A EP 81106869A EP 81106869 A EP81106869 A EP 81106869A EP 0047490 B1 EP0047490 B1 EP 0047490B1
Authority
EP
European Patent Office
Prior art keywords
hotplate
electric hotplate
insulation
electric
hotplate 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
EP81106869A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0047490A2 (de
EP0047490A3 (en
Inventor
Karl Fischer
Hermann Knauss
Felix Schreder
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer 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
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT81106869T priority Critical patent/ATE46963T1/de
Publication of EP0047490A2 publication Critical patent/EP0047490A2/de
Publication of EP0047490A3 publication Critical patent/EP0047490A3/de
Application granted granted Critical
Publication of EP0047490B1 publication Critical patent/EP0047490B1/de
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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/72—Plates of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/067—Arrangement or mounting of electric heating elements on ranges
    • 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

Definitions

  • the invention relates to an electric hotplate that interacts with associated built-in parts according to the preamble of claim 1.
  • the object of the invention is to provide a hotplate mounting that is as tension-free as possible, by means of which the hotplate is uniquely and securely fixed.
  • the hotplate is thus secured in the edge area, namely by elements that can already be attached during hotplate production. They engage in the openings of the built-in parts, for example a lower hotplate cover or a corresponding bracket, and thereby fix the hotplate in the circumferential direction and in the vertical direction.
  • the hotplate can therefore be mounted from above, and in particular if the fastening elements are advantageously provided with barb-like projections which engage behind leaf springs attached to the built-in parts, no assembly needs to be carried out from below to fasten the hotplate.
  • the fastening elements can be attached at any point on the edge, for example on the outer circumference, and the inner part of the hotplate edge need not be used for the fastening. This makes it possible to provide the hotplate with a lower cover which connects the lower edges of the edges to one another.
  • At least one spring element for resiliently pressing a thin and flexible tubular heating element against the underside of the hotplate body which is preferably made of steel with a thickness of less than 3 mm, can be provided, the spring element acting on the tubular heating element with the interposition of heat-resistant insulation and is supported on a base plate of the hotplate.
  • the hotplate body has no ribs on the underside, between which the heating elements are embedded, so that it has less mass and heat capacity. It can be made of sheet metal, for example, so that its thickness can be small.
  • the relatively thin tubular heaters used have a much smaller mass than the corresponding embedding in previous hot plates and the tubular heaters do not need to be arranged close together, but can be spaced apart.
  • the embedding for the heating coils in tubular heating elements is so densified by stretching and rolling processes that their thermal conductivity is better with excellent electrical insulation.
  • the distance between the heating coil and the cooking surface, and thus the bottom of the saucepan is smaller (almost by half the previously customary value), so that despite a further intermediate element, namely the jacket of the tubular heating element, a more direct heat transfer is possible.
  • the resilient pressure of the tubular heating element on the underside of the hotplate ensures a permanent system without annoying noises when heating or cooling and the interposition of the heat-resistant insulation ensures good efficiency even when stationary, preferably with a relatively firm intermediate layer or layer the top of the insulation ensures that the tubular heater does not dig into it more than intended during operation, despite the resilient pressure.
  • an electric hot plate 11 which has a hotplate body 12, which consists of a circular disc, preferably made of stainless chromium steel stands, which has an outer edge 13 and an inner edge 14 which are directed substantially vertically downwards.
  • the inner edge 14 includes an opening 15 which is intended to receive a conventional temperature sensor 17, indicated by dashed lines, in the form of a sensor box which is springy and can be pressed onto the bottom of the saucepan and is filled with expansion fluid.
  • a support sleeve 16 is pressed into the opening, which limits the upward movement of the sensor socket with an upper flange and defines it with a lower flange so that it can move to a limited extent.
  • This arrangement is described in detail, for example, in DE-C-2 422 678 (corresponding to GB-A-1 509 078), to which reference is made for details.
  • the outer edge 13 is relatively thin after a rounded transition and has a triangular circumferential notch 18 (FIG. 3) into which an overhang edge 19 in the form of a profiled ring made of a thin stainless steel sheet is snapped.
  • the cross section of the rim is an inverted, asymmetrical, relatively flat, rounded V.
  • the annular space between the outer and inner edges 13, 14 is closed by a base plate 20, which is circular and in its central region with the support sleeve 16 z. B. is connected by welding.
  • the upward-facing and provided with projections 22 outer edge 23 of the base plate lies in a manner explained later with reference to FIGS. 9 and 10 on the lower edge of the edge 13, is supported there and is centered on the edge.
  • a spring part 24 rests on the base plate, which has the shape of an eight-pointed star with a central hole in the example shown (FIG. 2) and consists of a spring plate.
  • Eight spring elements 25 in the form of upwardly bent leaf spring arms project outward from the annular hub as rays of the star.
  • the bottom plate 20 is provided with stiffening beads in such a way that the spring part and the spring elements each lie in the lower part of the bottom plate.
  • the spring elements 25 press in the central region of the heating ring zone formed between the inner and outer edge, ie with respect to the entire hotplate, relatively far out on a support disk 26, which lies as an annular, flat sheet metal disk in the annular space 27 enclosed by the base sheet 20 and the underside an insulation covering 28, which consists of two layers in the example shown.
  • the lower, thicker layer consists of a pressed bulk insulating material, preferably a fluffy to powdery A1 2 0 3 , which is pressed to form an essentially flat washer. This material has a very high thermal insulation ability, but is not mechanically very strong.
  • a glass fabric for example, can cover the top and / or bottom as a support layer.
  • a second insulating layer 30 is placed over this first layer 29, which consists of a fleece made of an inorganic fibrous insulating material. These are fibers made of A1 2 0 3 , which combine good mechanical strength with high heat resistance.
  • the insulation 28 consisting of the layers 29 and 30 is pressed by the spring elements 25 against the underside of tubular heating elements 31 and presses their flattened upper side against the underside of the hotplate body.
  • the hotplate body is as flat as possible on the upper side to form a cooking surface 32.
  • the tubular heaters consist in the usual way of a metallic jacket made of stainless steel of very small thickness (less than 0.4 mm, preferably 0.3 mm), in which helical heating resistors 33 are located in highly compressed, electrically insulating investment material.
  • the jacket 34 of the tubular heater is triangular shaped to create the upper contact surface and has width dimensions of 4 mm or less, so that there is a very flexible heater that is bent into the shape of a spiral ring and under the pressure of the spring element 25 and Intermediate layer of insulation with good thermal contact is pressed against the underside of the hotplate body.
  • the heating resistor consists of a spiral which has downward bends 35 in the inner and outer region of the annular space 27, to which the hotplate connections 36 are welded.
  • a temperature limiter 37 is interposed at a connection and senses the underside of the tubular heater.
  • the connections lead to a connection piece 38 which is attached to a laterally protruding connection plate fastened to the base plate and are to be connected there with the connection lines coming from the switch or controller.
  • the heating resistor can also be designed as a tandem spiral, i. H. two coaxial spirals of the same diameter, which are electrically connected in parallel. They have a larger heat-emitting surface and can be bent with a very small bending radius.
  • the support disk 26 can be ribbed to increase the rigidity.
  • An electric hotplate is created which has a thin and possibly corrosion-protected hotplate body with a thickness of less than 3 mm and to which tubular heating elements, which are flexible and easy to apply, are pressed by means of effective insulation.
  • the heated annular space 27 is closed, so that no heat losses are to be feared even by convection. Due to the good contact of the tubular radiators, which are relatively far apart, the distance from each other being around 1 1/2 times the width dimensions, the temperature in the tubular heater is kept relatively low, so that it does not tend to burn out.
  • the spring elements have one sufficient spring travel to ensure that the insulation is pressed even when the insulation compresses somewhat during operation.
  • the hotplate can be produced using less material and operated with better efficiency than other hotplates that are comparable in terms of their utility value.
  • the embodiment according to FIG. 4 differs from that according to FIGS. 1 to 3 in that the hotplate has no middle temperature sensor, so that the hotplate body 12a has no middle opening, but is only slightly embossed at this point, so that the ring-shaped, level Cooking surface 32 is contrasted.
  • the same parts have the same reference numerals.
  • the hotplate body also has no inner edge, so that the inner annular space 27a encompasses the entire underside of the hotplate.
  • the design of the outer and overflow rim 13, 19 is the same as in FIG. 1.
  • the bottom plate 20a extends over the entire underside of the hotplate and is not only supported but also fastened in the area of the outer rim 13. Parallel to it is at a distance a support disk 26a, which is a circular sheet metal disk and at the same time takes over the function of the spring part, in which, in the present example, radially inwardly directed tabs or arms are punched out, which are bent downwards, and the spring elements 25a form, which are resiliently supported on the base plate 20a.
  • the support disk 26 presses evenly on the insulation 28a, which in the present case consists of a single layer of pressed inorganic insulating material, which is provided on the top with a coating 39 which protects the insulation from the thermal and mechanical action of the tubular heating element. It can be an asbestos fiber layer or a ceramic layer.
  • a part is saved through the use of the support disk for cushioning, although in this case the support disk is to be produced from a spring material.
  • the hotplate attachment is also shown.
  • the overflow rim 19 lies with its outer lower edge on a step of a hotplate or hob 40 which lies in the region of an obliquely upward overflow or coiling rim 41 which surrounds the installation opening 42 of the hotplate.
  • the cooker or hob is closed at the bottom by a cover plate 43 which is supported on the underside of the hotplate.
  • the hotplate is held down on this cover plate, the function of which could also be taken over by a corresponding bracket in a different type of stove, by means of several, preferably three fastening elements or tabs 44, which are shown in detail in FIGS. 5 and 6. They are attached to the outside of the edge 13 by spot welding and project vertically downwards as narrow strips. At their end they have projections 45 formed by a barb-like bend, which protrude through openings 46 in the cover plate 43 and through corresponding, but offset openings 47 in a bow-shaped leaf spring 48. This is attached on one side to the cover plate 43 and is also supported on the other side to increase the spring force. The opening 47 is located in the central region of the leaf spring 48.
  • the offset of the openings together with the barb-like slope of the projection 45 when the tabs 44 are inserted through both openings causes the tab to bend somewhat elastically until the projection engages Underside of the leaf spring 48 has reached. In this way it is ensured that the projection 45 is held securely on the leaf spring, so that accidental loosening is impossible.
  • the hotplate is placed on until the overhang edge 19 rests on the corresponding point on the hotplate and then the spring 48 is pressed upwards until the projection 45 has engaged. Since only one edge of the opening is involved in the latching process (in FIG. 5 the right edge of the opening 46 and the left edge of the opening 47), the openings could also be replaced by corresponding edge arrangements.
  • the fastening elements 44 also form the anti-rotation device for the hotplate.
  • the support and centering of the base plate 20a on the edge 13 can still be seen from FIG. The edge is taken up in an angular shape of the floor panel.
  • FIG. 7 an electric hot plate is shown, which corresponds to that of FIG. 1 except for the insulation.
  • the insulation 28b shown here consists of a pressed inorganic insulating material, for example an A1 2 0 3 fiber fleece, into which a reinforcement 49 in the form of a wire mesh made of stainless steel wire is pressed in so far on the top and bottom that it is firm with the insulation is connected, but forms the outside of the insulation. This is best done when the insulation is wet-pressed.
  • the reinforcement which could also consist of another metal structure, for example a sheet metal provided with corresponding punchings, forms an extremely hard-wearing, rigid insulating part which nevertheless forms very good thermal insulation.
  • the tubular heating elements only touch the reinforcement in a punctiform manner. Nevertheless, the pressure force is transmitted safely and the spring elements 25 can act directly on the underside reinforcement without a supporting disk.
  • the base plate 20b is fastened by flanging the support sleeve 16.
  • FIG. 8 shows a variant of the hotplate fastening on the cover plate 43c.
  • a tab is punctured on the inside of the edge 13, which protrudes through openings in the base plate 20c.
  • These Tab 44c is inserted through an opening in cover plate 43c and secured by rotating the sheet metal tab. The twisted end forms a tab 50 on which a plug of an earth line can be plugged.
  • Fig. 9 the support of the bottom plate 20c on the lower edge of the edge 13 is shown greatly enlarged in detail.
  • the base plate In the region of its outer, upward-facing edge, the base plate has, in places, pronounced projections 22 on which the lower edge of the edge 13 is supported. The rest of the upward edge 23 of the base plate projects with the inner surface of the edge 13 for centering.
  • FIG. 10 An insulation 28d is shown in FIG. 10, which has a pyramidal profile on its upper side.
  • the profiling ensures that the tubular heating elements only abut to a large extent and that any manufacturing inaccuracies in the insulating element production are compensated for by partially pressing in the tubular heating elements.
  • the point system also reduces heat transfer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Insulated Conductors (AREA)
  • Table Devices Or Equipment (AREA)
  • Cookers (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • General Induction Heating (AREA)
  • Massaging Devices (AREA)
  • Paints Or Removers (AREA)
  • Organic Insulating Materials (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Surgical Instruments (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Liquid Crystal (AREA)
EP81106869A 1980-09-09 1981-09-03 Elektrokochplatte Expired EP0047490B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81106869T ATE46963T1 (de) 1980-09-09 1981-09-03 Elektrokochplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803033828 DE3033828A1 (de) 1980-09-09 1980-09-09 Elektrokochplatte
DE3033828 1980-09-09

Publications (3)

Publication Number Publication Date
EP0047490A2 EP0047490A2 (de) 1982-03-17
EP0047490A3 EP0047490A3 (en) 1982-05-05
EP0047490B1 true EP0047490B1 (de) 1989-10-04

Family

ID=6111450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106869A Expired EP0047490B1 (de) 1980-09-09 1981-09-03 Elektrokochplatte

Country Status (15)

Country Link
US (1) US4410793A (fi)
EP (1) EP0047490B1 (fi)
JP (1) JPS5777831A (fi)
AT (1) ATE46963T1 (fi)
AU (1) AU548139B2 (fi)
CA (1) CA1172678A (fi)
DE (2) DE3033828A1 (fi)
DK (1) DK388481A (fi)
ES (1) ES269068Y (fi)
FI (1) FI69230C (fi)
GR (1) GR75315B (fi)
NO (1) NO154250C (fi)
TR (1) TR22350A (fi)
YU (1) YU42699B (fi)
ZA (1) ZA816143B (fi)

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DE19845103A1 (de) * 1998-09-30 2000-04-06 Bsh Bosch Siemens Hausgeraete Kontaktwärmeübertragendes elektrisches Kochsystem und Verfahren zum Betreiben eines entsprechenden Kochsystems
US20080135541A1 (en) * 2006-12-09 2008-06-12 Zheng Peng Heating apparatus for appliances
US9132302B2 (en) * 2012-08-14 2015-09-15 Primaira, Llc Device and method for cooktop fire mitigation
US10085584B2 (en) * 2014-06-09 2018-10-02 Whirlpool Corporation Method of regulating temperature for sous vide cooking and apparatus therefor
WO2015196240A1 (en) * 2014-06-23 2015-12-30 Breville Pty Limited Multi cooker
AU2017243978A1 (en) * 2016-03-31 2018-09-20 Grillex Pty Ltd Cooking apparatus and method of assembly
CN107889300A (zh) * 2016-09-29 2018-04-06 浙江久康电器有限公司 插接式红外线电热炉盘及装用该电热炉盘的电加热灶
US10132504B1 (en) 2017-05-15 2018-11-20 Backer Ehp Inc. Dual coil electric heating element
US11067288B2 (en) 2017-05-15 2021-07-20 Backer Ehp Inc. Dual coil electric heating element
DE102017211812A1 (de) * 2017-07-11 2019-01-17 E.G.O. Elektro-Gerätebau GmbH Kochplattenvorrichtung mit einer Kochplatte und Kochfeld
US11287139B2 (en) * 2017-12-18 2022-03-29 Haiyan DongHai Electric Appliances Co., Ltd. Heating plate with cooking oil ignition prevention for electric cooking apparatus
USD955168S1 (en) 2019-07-03 2022-06-21 Backer Ehp Inc. Electric heating element
US11581156B2 (en) 2019-07-03 2023-02-14 Backer Ehp Inc. Dual coil electric heating element

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Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1554732A1 (de) * 1965-10-23 1970-04-30 Ego Elektro Blanc & Fischer Befestigungsvorrichtung fuer eine Kochplatte an einer Herdplatte
DE1579656A1 (de) * 1966-09-14 1970-09-10 Ego Elektro Blanc & Fischer Befestigungsvorrichtung fuer eine Kochplatte an einer Herdplatte
DE2620004A1 (de) * 1976-05-06 1978-01-19 Karl Fischer Elektrokochplatte mit einem temperaturbegrenzer

Also Published As

Publication number Publication date
YU216981A (en) 1983-09-30
AU7489681A (en) 1982-03-18
YU42699B (en) 1988-10-31
NO813053L (no) 1982-03-10
NO154250B (no) 1986-05-05
FI812706L (fi) 1982-03-10
DK388481A (da) 1982-03-10
ES269068U (es) 1983-10-16
ES269068Y (es) 1985-01-16
ATE46963T1 (de) 1989-10-15
DE3177110D1 (en) 1989-11-09
CA1172678A (en) 1984-08-14
AU548139B2 (en) 1985-11-28
ZA816143B (en) 1982-09-29
US4410793A (en) 1983-10-18
EP0047490A2 (de) 1982-03-17
GR75315B (fi) 1984-07-13
FI69230B (fi) 1985-08-30
EP0047490A3 (en) 1982-05-05
DE3033828A1 (de) 1982-04-29
NO154250C (no) 1986-08-13
JPS5777831A (en) 1982-05-15
FI69230C (fi) 1985-12-10
JPH0229940B2 (fi) 1990-07-03
TR22350A (tr) 1987-02-23

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