EP0313103B1 - Réchaud électrique comportant un disjoncteur de protection de température - Google Patents

Réchaud électrique comportant un disjoncteur de protection de température Download PDF

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Publication number
EP0313103B1
EP0313103B1 EP88118550A EP88118550A EP0313103B1 EP 0313103 B1 EP0313103 B1 EP 0313103B1 EP 88118550 A EP88118550 A EP 88118550A EP 88118550 A EP88118550 A EP 88118550A EP 0313103 B1 EP0313103 B1 EP 0313103B1
Authority
EP
European Patent Office
Prior art keywords
electric hotplate
hotplate
thermostat
casing
central zone
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 - Lifetime
Application number
EP88118550A
Other languages
German (de)
English (en)
Other versions
EP0313103A1 (fr
Inventor
Karl Fischer
Felix Schreder
Robert Kicherer
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
Priority claimed from DE19828219461 external-priority patent/DE8219461U1/de
Priority claimed from DE19823226264 external-priority patent/DE3226264A1/de
Priority claimed from DE8227145U external-priority patent/DE8227145U1/de
Priority claimed from DE19833301689 external-priority patent/DE3301689A1/de
Priority claimed from DE8301364U external-priority patent/DE8301364U1/de
Priority to AT88118550T priority Critical patent/ATE58588T1/de
Priority to EP88118550A priority patent/EP0313103B1/fr
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0313103A1 publication Critical patent/EP0313103A1/fr
Publication of EP0313103B1 publication Critical patent/EP0313103B1/fr
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/043—Mountings on controlled apparatus
    • 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
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • 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
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to electric hot plates with temperature protection switches.
  • Such a temperature limiter has become known from DE-C-11 23 059.
  • This temperature limiter which has been installed millions of times in hot plates, works extremely reliably and is particularly suitable for working as a relatively weak temperature limiter coupled to the heating temperature with a large switching hysteresis. It consists of a crescent-shaped insulating housing, in the recess of which a snap switch and a bimetal parallel to it are arranged and fixed in that they protrude into slots or openings.
  • the housing is closed by a lid and the temperature limiter is arranged in the unheated central zone of the electric hotplate, partially surrounding the cast-on central bolt, with the lid pointing downwards and snap switches and bimetal being arranged on the side.
  • the practical temperature limiter was surrounded by a cover cap.
  • DE-B 1 615 258 shows an electric hotplate with a temperature limiter which is arranged in a housing which is open on one side, the opening of which rests on the heating of the electric hotplate and with its housing partially protrudes from the cover plate of the electric hotplate.
  • the bimetal lies flat close to the heating, while the switch is in the part of the interior that protrudes outside the housing.
  • the housing is held down against the ceramic investment material of the heating by a shoulder provided on it, which abuts the edge of the cover plate. Due to the very small distance between the heating and the bimetal, this switch is largely independent of its exact installation position and contact. For this, quite considerable temperatures occur at the bimetal, which thereby comes into an unfavorable working area, and the switch is also at risk of temperature.
  • DE-C-1 104 087 shows an electric hotplate with a temperature limiter arranged in the central zone, which is still covered within the covering hood with a special covering cap which projects beyond the central zone. A special contact or defined contacting of the temperature limiter is not provided.
  • the cover hood should be relatively tight and was mainly used to avoid possible condensation on the housing of the temperature limiter during the heating phase, which could lead to leakage currents.
  • the object of the invention is to provide a temperature limiter which can be produced with even less manufacturing and assembly effort and the smallest possible dimensions and whose coupling characteristic to the hotplate is improved.
  • the cover cap Due to the resilient support of the housing of the temperature protection switch on the cover plate and the defined contact of the temperature protection switch due to its arrangement on a surface of the hotplate body in the unheated middle zone, it is possible to dispense with the cover cap previously surrounding the temperature protection switch, which results in a reduction in manufacturing and Installation effort brings.
  • the specific heat of the overall arrangement is also reduced, and a usually necessary insulating lead-through part for the connecting wires of the temperature protection switch through the cover cap can be omitted.
  • projections can be provided on the side of the housing containing the opening of the recess, said projections being pressed into contact with the surface of the hotplate body.
  • three projections can preferably be formed, which in particular have a rounded and possibly conical shape. These have the task, on the one hand, to ensure a sufficient distance between the functional parts of the temperature protection switch arranged in the recess and the hotplate body, on the other hand to ensure a defined system and still ensure a certain ventilation of the temperature protection switch.
  • a perforated, cup-shaped cover part can advantageously be provided for the unheated central zone. Due to the narrow, lattice-shaped structure of the bowl, which is also grounded due to the grounding of the hotplate body, despite effective ventilation of the central zone, it forms such a complete electrical protection that a temperature sensor can be used whose switch housing is open at least on one side, whereby advantageously Temperature sensor of the temperature protection switch is arranged in the switch housing.
  • the overall level of the temperature monitoring of the hotplate can be reduced somewhat in order to make do with a simpler and more robust switch which is integrated with its temperature sensor.
  • the temperature limitation still works perfectly, although at first glance it does not seem sensible to first lower the temperature level to be monitored before you sense it with a temperature limiter.
  • the bimetal is better coupled to the temperature to be monitored by both convection and radiation.
  • the temperature limiter designed for arrangement in the unheated central zone of the electric hotplate can advantageously point with its open side in the horizontal direction, e.g. B. normally for heating. However, it can also be consciously changed in its coupling characteristics by another arrangement. It is also possible to change this coupling characteristic by the snap switch and the bimetal lying in a horizontal plane in the installed state, the coupling characteristic changing depending on whether the Bi metal facing the hotplate body or is arranged facing away.
  • the very small box-shaped housing not only has a very uncomplicated design and is therefore very easy to manufacture from the most commonly used ceramic material (steatite), but also has a very small mass, so that there is no fear that condensation will adhere to the housing Precipitation of moisture that could lead to leakage currents.
  • the end and side walls of the housing surrounding the opening of the recess preferably protrude by 1 to 3 mm via the snap switch and the bimetal. This, together with the other features already described, enables the temperature limiter to be constructed without a cover.
  • the electric hotplate 2 shown in FIG. 1 has a hotplate body 1 made of cast material, preferably cast iron, with a heating ring area 11, which is closed towards the outside and inside by ring ribs 12, 13 projecting downwards.
  • a heating ring area 11 which is closed towards the outside and inside by ring ribs 12, 13 projecting downwards.
  • electrical heating resistors which are embedded in the grooves of the hotplate body in the insulating material.
  • the underside of the electric hotplate is closed off by a profiled cover plate 17 which, in the embodiment according to FIG. 1, rests on the lower edge of the annular outer edge 13, covers the entire underside of the hotplate and is pressed upwards by the bolt 16 and a nut 18 screwed thereon .
  • a temperature protection switch 19 is arranged in the unheated central zone 14. It is connected via supply wires 20 and is intended to switch off the heating or a part thereof when the hotplate assumes a temperature above its set limit temperature. It is desirable that the temperature protection switch responds with a certain delay, because it can be used in this way to switch off an increased parboiling power after it has responded, in order to then have sufficient boiling power.
  • the temperature protection switch 19 is shown enlarged in FIG. 2. It corresponds in its structure and function to that according to DE-C 1 123 059.
  • a housing 23 made of insulating material, such as steatite
  • the functional parts 3 of the temperature protection switch are arranged and fixed by inserting them into slots in the housing 23.
  • It is a bimetal 4, which is attached to a carrier 30 inserted into a slot 31 and moves the spring tongue of a snap spring of a snap switch 5.
  • the snap spring carries at one end a contact which cooperates with a fixed mating contact on a connecting bar 29 which, like a connecting bar 28 for supplying current to the snap spring, is inserted into slots 27 of the housing and thereby fixed.
  • the top view of the housing is essentially crescent-shaped or could also be described as rectangular with a recess on one long side and roundings on the opposite long side.
  • three projections 8 are provided on the edge 6 of the housing surrounding the recess 25 on the upper side 7, to which the recess 25 has its opening, which are integrally formed with the housing 23 and none have a conical shape with a rounded tip.
  • the temperature protection switch 19 is arranged in the central zone so that the central eye 15 is in the region of the recess 9 on a long side of the housing, this side having a flat, which in a flat 10 of the lower surface 50 of the central zone 14 passes.
  • the cover plate 17 preferably has only one projection 51, which is designed as an inwardly pronounced bead of the cover plate and presses on the flat underside 52 of the housing 23.
  • the projections 8 are defined and pressed firmly against the surface 50 of the hotplate body in the region of the central zone.
  • the opening of the recess 25 is open at the top, but is covered at some distance from the surface 50 of the hotplate body and is thus protected against contact.
  • the temperature protection switch When the bolt 16 or the nut 18 is tightened, the temperature protection switch is thus pressed into contact with the hotplate body.
  • an elastic design of the cover plate contributes, which, however, could also be supported by a corresponding spring element and / or shape of the end plate or the projection 51. So you could imagine, for example, that the area around the projection is formed resiliently by slots in the cover plate.
  • the current-carrying functional parts 3, ie in particular bimetal 4 and snap switch 5, are at a considerable distance from the open side of the housing 23, ie its end walls and side walls, project over these parts by an amount between 1 and 3 mm. Given the relatively small width of the recess 25 (less than 10 mm), there is sufficient protection against contact, so that a cover projecting beyond the recess 25 is not necessary. This improves the thermal connectivity of the temperature limiter and lowers its already very low overall mass, which benefits its switching and leakage current behavior.
  • the heating ring area 11 is covered downwards by a cover plate, part 17a of which rests on the edges 12 and 13 and is centered with a bent section 72 inside the inner edge 12.
  • the temperature protection switch 19 is switched on via two connecting lines 74 in one of the circuits of the hotplate.
  • the lines 74 are led out of the central zone by means of an arranged insulating bushing 75 opposite the temperature protection switch 19.
  • the central zone is covered by a cover part 76 forming the second part of the cover plate, which has the shape of a relatively flat bowl with a substantially flat bottom 77, a substantially cylindrical jacket 78 and an outwardly projecting support flange 79 at the end of the jacket region 78.
  • This support flange 79 rests on a shoulder 80 of the first part 17a of the cover plate and presses it against the underside of the edge 12.
  • the cup-shaped support part 76 is made of perforated sheet material of relatively large thickness, preferably over 0.8 mm.
  • the sheet material is 1 mm thick.
  • the sheet metal material has circular holes 88 which are arranged in any manner and whose diameter is only a few millimeters, the hole area preferably being one third to two thirds and particularly preferably over half the total area. Because of the production of the bowl from sheet metal material perforated before the bowl deformation, the holes are provided over the entire bowl surface, but form a relatively coherent surface in the area of the outer support flange 79 that there is a uniform pressing of the cover plate 17a on the edge 12 .
  • the cover part 76 is fixed by means of a nut 81 screwed onto the fastening bolt 16 and thus also secures the first, outer part 17a of the cover plate.
  • the temperature protection switch 19 is open on one side, i. H. its bimetal and the current-carrying switch parts are not covered by a special insulating cover. In normal operation it is almost impossible that something could touch these live parts without simultaneously touching the grounding provided by the grid-shaped or perforated cover part.
  • the temperature limiter is particularly versatile, and its coupling (fast or sluggish) can be arranged by placing it on the hotplate or on one side, i.e. H. with in i. w. horizontal direction of the opening can be adapted to different requirements. It has also been shown that the previously required covering of the central zone (14) of the hotplate by a separate cover can be dispensed with in this temperature limiter without there being an increased risk of leakage current.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermally Actuated Switches (AREA)

Claims (10)

1. Réchaud électrique avec un interrupteur de protection de température (19) monté sur le réchaud et comportant un boîtier (23) en matériau isolant qui possède un évidement (25) ouvert d'un côté, dans lequel se trouve un interrupteur à déclic (5) et un bimétal (4) qui agit sur l'interrupteur à déclic et qui est disposé sur un support (30), le boîtier (23) de l'interrupteur de protection de température (19) s'appuyant contre une tôle de recouvrement (17) qui recouvre au moins partiellement le dessous du réchaud électrique, et l'interrupteur de protection de température (19) étant pressé en contact défini contre une surface (50) du corps (1) du réchaud dans la zone centrale non chauffée (14), caractérisé en ce que la tôle de recouvrement (17) possède au moins une partie en saillie (51) obtenue par repoussage et orientée vers l'intérieur, qui agit sur le boîtier (23) de l'interrupteur de protection de température (19), la tôle de recouvrement (17) et/ou la partie en saillie (51) étant conçue élastique.
2. Réchaud électrique selon la revendication 1, caractérisé en ce que les pièces fonctionnelles (3) de l'interrupteur de protection de température sont disposées dans un évidement (25), ouvert et démuni de couvercle, du boîtier (23), dont l'ouverture est tournée vers le corps (1) du réchaud, des parties saillantes (8) étant prévues de préférence sur le côté du boîtier (23) qui contient l'ouverture de l'évidement (25), lesquelles sont pressées en contact contre une surface du corps (1) du réchaud, et trois parties saillantes (8) étant de préférence formées sur le bord (6) du boîtier (23) qui entoure l'évidement (25), et présentant notamment une configuration arrondie et éventuellement conique.
3. Réchaud électrique selon la revendication 1 ou 2, caractérisé en ce qu'une tôle de recouvrement, qui recouvre le dessous du réchaud électrique (11), est constituée d'une première partie (17a), qui laisse dégagée une zone centrale (14), et d'une partie de recouvrement (76) interrompue, distincte et disposée dans la région de la zone centrale (14), laquelle partie de recouvrement est éventuellement fixée en position par un goujon central (16) qui agit contre le réchaud électrique (11) dans la zone centrale (11) et qui dépasse par le tronçon central de la partie de recouvrement (76).
4. Réchaud électrique selon la revendication 3, caractérisé en ce que la partie de recouvrement (76) est une coupelle en tôle perforée, qui est avantageusement perforée avant sa déformation et qL est d'une épaisseur relativement importante (de préférence supérieure à 0,8 mm), et dont le diamètre des trous n'est que de quelques millimètres, la surface perforée s'étendant de préférence sur un tiers à deux tiers, et d'une manière encore plus préférentielle sur la moitié de la surface totale, et les trous étant notamment également prévus dans la région d'enveloppe sensiblement cylindrique de la partie de recouvrement (76).
5. Réchaud électrique selon la revendication 3 ou 4, caractérisé en ce que le bord de la partie de recouvrement (76) repose, sur la quasi-totalité de sa périphérie, sur un épaulement (80) de la tôle de recouvrement de forme annulaire (17b), et presse cette dernière contre un bord du corps du réchaud qui entoure la zone centrale.
6. Réchaud électrique selon l'une des revendications 3 à 5, caractérisé en ce que le bord de la partie de recouvrement (76) possède une bride de soutien entourante (79), tournée vers l'extérieur.
7. Réchaud électrique selon l'une des revendications précédentes, caractérisé en ce que la tôle de recouvrement (17) présente, dans la région de l'interrupteur de protection de température (19), des ouvertures, perçages, fentes ou similaires (43).
8. Réchaud électrique selon l'une des revendications précédentes, caractérisé en ce qu'à l'état installé, l'interrupteur à déclic (5) et le bimétal (4) se trouvent dans un plan horizontal.
9. Réchaud électrique selon l'une des revendications précédentes, caractérisé en ce que les parois latérales et frontales (6) du boîtier (23), qui entourent l'ouverture de l'évidement, dépassent de préférence de 1 à 3 mm au-dessus de l'interrupteur à déclic (5) et du bimétal (4).
10. Réchaud électrique selon l'une des revendications précédentes, caractérisé en ce que le côté ouvert de l'interrupteur de protection de température (19) conçu pour être disposé dans une zone centrale non chauffée (14) du réchaud électrique (11), est orienté en direction horizontale.
EP88118550A 1982-07-07 1983-07-05 Réchaud électrique comportant un disjoncteur de protection de température Expired - Lifetime EP0313103B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP88118550A EP0313103B1 (fr) 1982-07-07 1983-07-05 Réchaud électrique comportant un disjoncteur de protection de température
AT88118550T ATE58588T1 (de) 1982-07-07 1983-07-05 Elektrokochplatte mit einem temperaturschutzschalter.

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
DE8219461U 1982-07-07
DE19828219461 DE8219461U1 (de) 1982-07-07 1982-07-07 Elektrokochplatte
DE3226264 1982-07-14
DE19823226264 DE3226264A1 (de) 1982-07-14 1982-07-14 Temperaturbegrenzer fuer elektroheiz- oder waermegeraete, insbesondere elektrokochplatten
DE8227145U DE8227145U1 (de) 1982-09-28 1982-09-28 Elektrokochplatte
DE8227145U 1982-09-28
DE3301689 1983-01-20
DE19833301689 DE3301689A1 (de) 1983-01-20 1983-01-20 Elektrokochplatte
DE8301364U DE8301364U1 (fr) 1982-07-07 1983-01-20
EP88118550A EP0313103B1 (fr) 1982-07-07 1983-07-05 Réchaud électrique comportant un disjoncteur de protection de température

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP83106525.5 Division 1983-07-05

Publications (2)

Publication Number Publication Date
EP0313103A1 EP0313103A1 (fr) 1989-04-26
EP0313103B1 true EP0313103B1 (fr) 1990-11-22

Family

ID=27544328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118550A Expired - Lifetime EP0313103B1 (fr) 1982-07-07 1983-07-05 Réchaud électrique comportant un disjoncteur de protection de température

Country Status (1)

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EP (1) EP0313103B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1442112A (fr) * 1965-08-04 1966-06-10 Plaque de cuisson électrique avec commande thermique
GB1096659A (en) * 1965-11-08 1967-12-29 Ass Elect Ind Improvements in electric hotplate temperature controllers

Also Published As

Publication number Publication date
EP0313103A1 (fr) 1989-04-26

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