EP0288915B1 - Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique - Google Patents
Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique Download PDFInfo
- Publication number
- EP0288915B1 EP0288915B1 EP88106444A EP88106444A EP0288915B1 EP 0288915 B1 EP0288915 B1 EP 0288915B1 EP 88106444 A EP88106444 A EP 88106444A EP 88106444 A EP88106444 A EP 88106444A EP 0288915 B1 EP0288915 B1 EP 0288915B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature sensor
- heating element
- spacer
- radiant heating
- insulator
- 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
Links
Images
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
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/04—Heating plates with overheat protection means
Definitions
- the invention relates to an electric radiant heater for heating a plate, in particular a glass ceramic plate according to the preamble of claim 1.
- Such radiant heaters usually have a temperature sensor, the outer tube of which consists of an insulating material, in particular quartz or quartz glass. It is either itself included in the expansion system of the sensor, in which it forms a tube with a low expansion coefficient, in which a tension rod lies, or it is pushed onto an expansion tube.
- This pipe is used to ensure the necessary air or creepage distances in the space between the heating resistors and the plate through which the temperature sensor passes.
- glass ceramic plates become electrically conductive at working temperature, so that the necessary insulation distances must be observed here.
- quartz glass tubes are not only relatively expensive, but also fragile and require special measures when installing them on the radiant heater.
- radiant heaters From EP-A1-0 116 861, DE-A1-3 007 037 and WO-A1-85 / 01 412, radiant heaters have become known which have radiation shields for the side of the temperature sensor facing the heating resistors or between adjacent longitudinal sections of the temperature sensor.
- the invention has for its object to provide an electric radiant heater in which the self-insulation of the temperature sensor can be dispensed with.
- a minimum air gap between the sensor tube, which can preferably be metallic and possibly also be grounded, and the heating resistors is ensured. It has been determined in tests that the most significant danger that a predetermined air gap could possibly be undershot arises from the fact that the insulating body, which can have two layers, bulges upwards during continuous operation and thus brings the heating resistors closer to the sensor tube. This is avoided with certainty by the spacers.
- the relatively stiff sensor tube ensures that the insulating body remains flat.
- the spacers do not need to be in constant contact with the temperature sensor. Rather, there can be a certain distance if it is ensured that the desired minimum distance is still present when the spacers are in contact. This minimum distance can be, for example, 3 mm, while the total air distances, including the distance of the temperature sensor from the plate, should be approximately 8 mm.
- the spacer can preferably be formed by at least one projection of the insulating body, which lies in particular in an unheated and central region of the radiant heater and can be formed in one piece with the material of the insulating body, for example when it is vacuum formed.
- An embodiment with two projections spaced apart from one another in the central region is particularly preferred.
- a spacer can be formed for contact with the underside of the plate. In this case, it keeps the distance between the plate and the insulating body constant, so that the insulating body cannot "grow" on the temperature sensor.
- a combination of the two measures is also conceivable, for example in that a protrusion extending from the insulating body has a contact surface for the plate and a support for the temperature sensor. This can be done in the form of a staggered cam or a projection with a hole for the temperature sensor.
- a further embodiment can be formed in that a spacer is pushed onto the temperature sensor, for example in the form of a round or square disk, which is provided for contacting the insulating body and / or the plate. Due to the asymmetrical design of this pane, different distances from the underside of the glass ceramic plate and from the insulating body can also be maintained.
- the previous temperature sensors had to be arranged very flexibly because of their sensitive quartz tubes and were preferably inserted into upwardly open slots in an otherwise peripheral edge of the insulating body and a carrier shell surrounding it and had play in these recesses in order to prevent any stresses from occurring.
- Due to the possibility of using a rigid metallic sensor the temperature sensor and thus the entire controller can now be mounted largely rigid, for example by inserting its mostly somewhat tapered free end into a hole in the carrier shell that is closed at the top while the Switch side can be fixed to the support shell of the radiant heater with a bracket.
- the insulating edges can also be closed at the top and thus offer more complete insulation.
- the temperature sensor can thus be inserted into relatively narrow holes in the edge and practically forms a seal to the outside.
- FIGS 1 to 3 show a radiant heater 11, which is provided for heating a glass ceramic plate 12 of a hob or a cooker.
- the radiant heater is pressed against the underside of the plate 12 by spring elements, not shown.
- It consists of a sheet metal carrier shell 13 with a bottom and a circumferential upstanding edge 14.
- An insulating body 15 lies in it and is underlaid with a further insulating layer 16. While the insulating body 15 is made of a relatively solid and high-temperature-resistant insulating material based on ceramic fibers in the vacuum suction process, the insulating layer 16 consists of an optimally insulating, but less solid insulating material, for example a bulk material made of microporous fumed silica.
- the insulating body 15 is also bowl-shaped with a relatively thin bottom 19 and a peripheral edge 17 which protrudes slightly above the edge 14 of the sheet metal carrier shell and is pressed against the underside 18 of the plate 12 by the pressure springs.
- Electrical heating resistors 20 in the form of wire coils are attached to the top of the bottom 19. In the present example, this is done by partially pressing the coils into the still moist molding of the insulating body 15.
- the bottom has ribs 21 that run in a star shape, into which the heating coils are pressed in somewhat further, while they penetrate only a little into the insulating body. This creates a secure fixing of the heating coils that does not hinder the radiation.
- any other type of fixing is possible, for example by means of putty or the like, and other insulating materials or configurations of the insulating body can also be used within the scope of the invention.
- a temperature sensor 23 of a temperature switch 24 runs through the space 22 formed between the floor 19 with the heating resistors 20 arranged thereon and the underside of the plate 18 and the circumferential edge 17, said temperature sensor being a temperature limiter or a temperature protection switch which has to ensure that that the underside 18 of the plate 12 remains limited in temperature to a certain value because, for example, glass ceramic plates suffer permanent damage when overheated.
- the switch head 25 of the temperature switch 24, which contains at least one snap switch and possibly a second contact as a signal contact for signaling the hot state of the plate, is fixed outside the insulating body to an angular holder 26 which is screwed to the carrier shell 13.
- the temperature sensor 23 is elongated and rod-shaped.
- the temperature switch consists of a metal tube 27 in which a ceramic rod 28 is located (FIG. 3), which has a lower coefficient of thermal expansion than the metal tube, so that a snap switch can be actuated due to the difference in length in the switch head.
- the outer tube 27 is tapered and provided with an internal thread, so that the switch can be adjusted via an adjusting screw 30 on which the ceramic rod 28 is supported.
- This structure of the temperature switch is extremely simple and robust, since the metal tube 27 can be largely firmly connected to the switch head 25 and also has no tendency to break.
- the temperature sensor can therefore advantageously be permanently mounted on both ends, i.e.
- This opening 31 like the openings 32 in the edge 17 of the insulating body, can be a circular opening which is closed towards the glass ceramic plate. This ensures that there is no unnecessary heat loss, and the temperature sensor is firmly attached to the radiant heater and contributes to its stiffening. Nevertheless, it can move somewhat longitudinally at its free end in the manner due to its length.
- the temperature sensor runs through the space 22 such that it is at a distance a from the heating resistors and a distance b from the plate. If one adds the diameter d of the temperature sensor 23, the total distance c from the underside of the plate 12 results.
- the distance a may be a certain minimum dimension not less than, and the total distance a + b must not be less than a certain amount in order to comply with the safety regulations. Nevertheless, the distance c should be as small as possible, on the one hand to get the heating as close as possible to the glass ceramic plate and on the other hand to keep the total height or depth of the radiant heater as small as possible and to this extent the insulation by the insulating layers 15, 16 to make it as big as possible.
- Fig. 2 shows that they are each in unheated areas 36, which are formed by an S-shaped loop of the double spiral, in which the heating resistors are placed. Two heating resistors run parallel in the form of a spiral, which turns in the center and runs out parallel to the incoming spiral.
- These protrusions can be quadrangular protrusions formed from the material of the insulating body when it is formed, which protrusions have a quadrangular or pyramid-shaped or round or conical shape.
- the variant shown in Fig. 4 has the same construction a spacer 35a, which, like the spacer according to Figures 1 to 3, has a contact surface 37 for the temperature sensor 23, but additionally a contact surface 38, the underside 18 of the plate 12 is opposite and can be supported on this.
- the spacer formed by the protrusion 35a thereby has an approximately L-shape. It can also be U-shaped.
- the spacer 35b is not provided on the insulating body but on the temperature sensor and consists of a disc which is not very strong in the longitudinal direction of the temperature sensor and which is pushed onto the temperature sensor. It also ensures the distance of the temperature sensor both from the insulating body 15 and from the plate 12, but could also provide only one or the other spacing or ensure different distances by a correspondingly one-sided design.
- the temperature sensor does not require the additional quartz tube, it can be manufactured with a smaller diameter d, which in turn enables the overall height to be reduced. Rather, the sensor tube can be earthed, so that even in the event of a belly of the glass ceramic plate, it lies as a protective earthed component over the heater and, for example, prevents a "broken through" cooking vessel from being energized.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Resistance Heating (AREA)
- Electric Stoves And Ranges (AREA)
- Control Of Resistance Heating (AREA)
- Surface Heating Bodies (AREA)
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8706277U DE8706277U1 (de) | 1987-05-01 | 1987-05-01 | Elektrischer Strahlungsheizkörper zur Beheizung einer Platte, insbesondere einer Glaskeramikplatte |
DE8706277U | 1987-05-01 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0288915A2 EP0288915A2 (fr) | 1988-11-02 |
EP0288915A3 EP0288915A3 (en) | 1989-01-04 |
EP0288915B1 true EP0288915B1 (fr) | 1994-06-22 |
EP0288915B2 EP0288915B2 (fr) | 1998-11-11 |
Family
ID=6807587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88106444A Expired - Lifetime EP0288915B2 (fr) | 1987-05-01 | 1988-04-22 | Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique |
Country Status (7)
Country | Link |
---|---|
US (1) | US4845340A (fr) |
EP (1) | EP0288915B2 (fr) |
JP (1) | JP2700463B2 (fr) |
AT (1) | ATE107831T1 (fr) |
DE (2) | DE8706277U1 (fr) |
ES (1) | ES2054727T5 (fr) |
YU (1) | YU46335B (fr) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5177339A (en) * | 1988-05-27 | 1993-01-05 | Ceramaspeed Limited | Radiant electric heaters |
DE68923181T2 (de) * | 1988-05-27 | 1995-10-26 | Ceramaspeed Ltd., Droitwich, Worcestershire | Elektrische Strahlungsheizgeräte. |
DE3828192A1 (de) * | 1988-08-19 | 1990-02-22 | Ego Elektro Blanc & Fischer | Strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung |
US5128516A (en) * | 1989-02-17 | 1992-07-07 | Therm-O-Disc, Incorporated | Heating element control |
CA2007729A1 (fr) * | 1989-02-17 | 1990-08-17 | Emil R. Plasko | Dispositif de command/regulation pour element chauffant |
DE8914611U1 (de) * | 1989-12-12 | 1990-02-01 | Bosch-Siemens Hausgeräte GmbH, 8000 München | Anschlußstein (Protektor) für eine Heizplatte eines Haushalt-Elektroherdes |
DE4022292A1 (de) * | 1990-07-15 | 1992-01-16 | Ego Elektro Blanc & Fischer | Elektrisches strahlungsheizelement |
DE4109569A1 (de) * | 1991-03-22 | 1992-09-24 | Buchtal Gmbh | Elektrische heizplatte |
DE9108012U1 (de) * | 1991-06-28 | 1991-09-05 | Bosch-Siemens Hausgeräte GmbH, 8000 München | Netzspannungs-Berührungsschutz für Sensoren unter Glaskeramik-Kochflächen |
DE9108013U1 (de) * | 1991-06-28 | 1991-09-05 | Bosch-Siemens Hausgeräte GmbH, 8000 München | Netzspannungsisolierung für Sensoren unter Glaskeramik-Kochflächen |
GB2260442B (en) * | 1991-10-09 | 1995-06-07 | Ceramaspeed Ltd | Radiant heater incorporating a temperature control device |
DE9113992U1 (de) * | 1991-11-12 | 1992-01-02 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Strahlungs-Heizeinheit |
US5796075A (en) * | 1992-03-09 | 1998-08-18 | E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg | Heater, particularly for kitchen appliances |
US5256860A (en) * | 1993-01-22 | 1993-10-26 | Therm-O-Disc, Incorporated | Control for glass cooktops utilizing rod-shaped thermistor |
GB2278237B (en) * | 1993-05-21 | 1996-09-04 | Ceramaspeed Ltd | Thermal cut-out device |
DE19846512A1 (de) * | 1998-10-09 | 2000-04-13 | Ego Elektro Geraetebau Gmbh | Einbau eines Gehäuses einer Schalteinrichtung |
DE10006954A1 (de) * | 2000-02-16 | 2001-10-11 | Bsh Bosch Siemens Hausgeraete | Kochfeld mit Temperaturfühler |
SI1187512T1 (en) * | 2000-09-07 | 2005-04-30 | E.G.O. Elektro-Geraetebau Gmbh | Radiant electric heater being placed under a cooking plate, particularly under a glass-ceramic plate |
GB2372190B (en) * | 2000-12-16 | 2005-02-09 | Ceramaspeed Ltd | Cooking appliance with radiant electric heater |
EP1303169A1 (fr) * | 2001-10-15 | 2003-04-16 | Heraeus Sensor-Nite GmbH | Capteur de température utilisant un élément sensible ainsi que son utilisation |
GB0301164D0 (en) * | 2003-01-18 | 2003-02-19 | Ceramaspeed Ltd | Temperature-responsive device |
GB0616353D0 (en) * | 2006-08-17 | 2006-09-27 | Ceramaspeed Ltd | Radiant electric heater |
TW201227761A (en) | 2010-12-28 | 2012-07-01 | Du Pont | Improved thick film resistive heater compositions comprising ag & ruo2, and methods of making same |
JP6336205B2 (ja) * | 2015-10-12 | 2018-06-06 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 温度センサ付きブレンダ |
WO2018106614A1 (fr) * | 2016-12-07 | 2018-06-14 | Ceramaspeed, Inc | Appareil de chauffage par rayonnement électrique |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3710076A (en) * | 1972-02-17 | 1973-01-09 | J Frazier | Radiant surface-heater and temperature sensing assembly |
SE7806238L (sv) * | 1977-07-02 | 1979-01-03 | Fischer Karl | Elektriskt stralningsvermeelement, serskilt for glaskeramikkokhell |
GR69904B (fr) * | 1979-10-27 | 1982-07-20 | Ego Elektro Blanc & Fischer | |
NZ196104A (en) * | 1980-02-01 | 1984-08-24 | Micropore International Ltd | Cooker plate with twin element:thermal cut-out for one |
DE3007037A1 (de) * | 1980-02-26 | 1981-09-03 | Ego Elektro Blanc & Fischer | Glaskeramik-kochgeraet |
DE3143692A1 (de) * | 1981-11-04 | 1983-05-11 | Ego Elektro Blanc & Fischer | Strahlheizkoerper zur beheizung von koch- und waermeflaechen |
US4508961A (en) * | 1982-03-02 | 1985-04-02 | Micropore International Limited | Electric radiant heater units for glass ceramic top cookers |
DE3302489A1 (de) * | 1983-01-26 | 1984-07-26 | Ego Elektro Blanc & Fischer | Elektrischer strahlheizkoerper zur beheizung von koch- oder waermeplatten, insbesondere glaskeramikplatten |
GB8324271D0 (en) * | 1983-09-10 | 1983-10-12 | Micropore International Ltd | Thermal cut-out device |
DE3410442A1 (de) * | 1983-09-17 | 1985-09-26 | Ego Elektro Blanc & Fischer | Temperaturfuehler, insbesondere fuer einen temperaturbegrenzer fuer eine glaskeramik-kocheinheit |
DE3519035A1 (de) * | 1985-05-25 | 1986-11-27 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Elektro-kochplatte |
DE8515560U1 (de) * | 1985-05-25 | 1985-08-29 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Kochstellen-Beheizung |
-
1987
- 1987-05-01 DE DE8706277U patent/DE8706277U1/de not_active Expired
-
1988
- 1988-04-22 EP EP88106444A patent/EP0288915B2/fr not_active Expired - Lifetime
- 1988-04-22 AT AT88106444T patent/ATE107831T1/de not_active IP Right Cessation
- 1988-04-22 ES ES88106444T patent/ES2054727T5/es not_active Expired - Lifetime
- 1988-04-22 DE DE3850297T patent/DE3850297D1/de not_active Expired - Fee Related
- 1988-04-28 JP JP63104467A patent/JP2700463B2/ja not_active Expired - Fee Related
- 1988-04-29 US US07/188,262 patent/US4845340A/en not_active Expired - Lifetime
- 1988-05-04 YU YU87388A patent/YU46335B/sh unknown
Also Published As
Publication number | Publication date |
---|---|
ES2054727T5 (es) | 1999-02-01 |
JPS63284788A (ja) | 1988-11-22 |
YU46335B (sh) | 1993-05-28 |
EP0288915A2 (fr) | 1988-11-02 |
YU87388A (en) | 1990-08-31 |
JP2700463B2 (ja) | 1998-01-21 |
EP0288915A3 (en) | 1989-01-04 |
ES2054727T3 (es) | 1994-08-16 |
US4845340A (en) | 1989-07-04 |
EP0288915B2 (fr) | 1998-11-11 |
DE3850297D1 (de) | 1994-07-28 |
ATE107831T1 (de) | 1994-07-15 |
DE8706277U1 (de) | 1987-06-25 |
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