WO2008110447A2 - Table de cuisson dotée d'une zone de détection de température - Google Patents

Table de cuisson dotée d'une zone de détection de température Download PDF

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Publication number
WO2008110447A2
WO2008110447A2 PCT/EP2008/052255 EP2008052255W WO2008110447A2 WO 2008110447 A2 WO2008110447 A2 WO 2008110447A2 EP 2008052255 W EP2008052255 W EP 2008052255W WO 2008110447 A2 WO2008110447 A2 WO 2008110447A2
Authority
WO
WIPO (PCT)
Prior art keywords
temperature sensor
hob
recess
plate
hob plate
Prior art date
Application number
PCT/EP2008/052255
Other languages
German (de)
English (en)
Other versions
WO2008110447A3 (fr
Inventor
Miguel Angel BUÑUEL MAGDALENA
Jesús CEAMANOS GAYA
Jose-Ramon Garcia Jimenez
Rosa Isabel Merino Rubio
José Ignacio Peña Torre
Daniel Sola Martinez
Original Assignee
BSH Bosch und Siemens Hausgeräte 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 BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to DE112008000231T priority Critical patent/DE112008000231A5/de
Publication of WO2008110447A2 publication Critical patent/WO2008110447A2/fr
Publication of WO2008110447A3 publication Critical patent/WO2008110447A3/fr

Links

Classifications

    • 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
    • F24C7/08—Arrangement or mounting of control or safety devices
    • 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
    • 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

Definitions

  • the invention is based on a hob with a hob plate and a temperature ture- sensor according to the preamble of claim 1 and a method for operating a hob according to the preamble of claim 16th
  • the object of the invention is in particular to provide a hob with an improved temperature sensor and a method for operating such a hob.
  • the invention is based on a hob with a hob plate with a top for setting up cookware and a temperature sensor arranged in a temperature sensor area on the underside of the hob plate temperature sensor.
  • the hob plate in the temperature sensor area has a reduced material thickness compared to an environment of the temperature sensor area. Due to the reduced material thickness, the thermal conductivity of the hob plate can be improved in the temperature sensor area, resulting in a faster and more accurate detection of the temperature of arranged on the surface of the hob plate cookware. Due to the reduced material thickness, a more direct Contact between the temperature sensor and the cookware can be achieved and disturbances that are caused by a high heat capacity of the hob plate can be avoided.
  • the cooktop panel is preferably formed as a glass or ceramic hob plate, with alternative embodiments of the invention are conceivable in which the cooktop panel is made of other mineral materials, such as porcelain.
  • the term "ceramic" is to be understood broadly in this context.
  • the cooktop panel may comprise printed markings for heating zones or other means for visualizing the heating zones If the temperature sensor region is circular in a plan view, commercial circular contact surface temperature sensors can be used without adjustment difficulties.
  • the temperature sensor region may be characterized by a suitable coating which improves an adhesive force and / or thermal contact of the temperature sensor.
  • the temperature sensor area comprises a recess in the underside of the hob plate, which in a particularly advantageous embodiment is designed as a blind hole.
  • the top can then be flat in an area corresponding to the temperature sensor area on the bottom, so that the top is easy to clean.
  • the diameter of the recess is at least 1.5 times the depth of the recess, good thermal contact can be ensured through the bottom of the recess or the region of low material thickness, while influences of an edge surface of the recess on the temperature measurement are comparatively small can be kept. Since the depth of the recess is limited by the thickness of the hob plate or by the high requirements for the stability of the hob plate, which must be met according to the standard EN.60.335-2-6 (Annex X), a large heat contact surface on the ground the depression can be achieved by the fact that the above-defined ratio between the diameter and the depth of the depression is as large as possible.
  • the present invention is based on the surprising finding that even ceramic hobs with areas of reduced material thickness can successfully pass these tests.
  • a diameter of the recess is at least as large as the material thickness of the glass ceramic plate in the vicinity of the temperature sensor region, an influence of the edges of the depression on the temperature measurement can be kept low. It can be achieved that the temperature sensor in the recess is mainly responsive to the bottom temperature of the cookware on the surface and is less sensitive to the temperature of the ceramic material in the vicinity of the recess. In this case, owing to the area ratios, an influence of the temperature of the edge surface of the depression can be largely excluded if a diameter of the depression is at least three times greater than the material thickness of the glass ceramic plate in the vicinity of the temperature sensor region.
  • a particularly good thermal contact can be established if the temperature sensor is arranged in the recess.
  • the thermal contact can also be mediated by an arranged in the well element with good thermal conductivity.
  • the diameter of the temperature sensor is smaller than a diameter of the recess. Then it can be avoided that the temperature sensor jammed in the recess and generates material stresses that can lead to breakage of the hob plate.
  • a precisely manufactured recess and a crack-free cooking surface plate can be ensured if the recess is introduced in a laser processing method in the hob plate.
  • the size of the temperature sensor portion can be made smaller than the diameter of the temperature sensor, and a destabilizing influence of the lower material thickness temperature sensor portion on the entire cooktop panel can be reduced.
  • the heat-conducting element comprises a projection whose shape at least substantially corresponds to a negative shape of the recess, wherein the projection engages in the recess.
  • the hob is designed as an induction hob or arranged below the cooktop induction heating, in the heating zone, the temperature sensor is arranged, the benefits of the invention come into play, since in induction cooktops fast and precise control of the heat supply is possible, but with a precise temperature measurement with a short reaction time must go hand in hand. Further, in induction cooking fields, there is a less definite relationship between the heating power and a time integral therebetween and the temperature of the cooktop panel so that a temperature measurement, in particular a measurement of the temperature of a bottom of a pan or other cooking utensil mounted on the cooktop panel significantly improved controllability of a cooking or cooking process can lead.
  • the area-related thermal conductivity can be at least doubled if the material thickness of the hob plate in the temperature sensor area is at most half as large as the material thickness of the hob plate in the vicinity of the temperature sensor area.
  • a high thermal conductivity with sufficient stability of the entire hob plate can be achieved if the material thickness of the hob plate in the temperature sensor range between 0.8mm and 1, 5mm and the material thickness of the hob plate in the vicinity of the temperature sensor range is between 4mm and 7mm. If the temperature sensor is designed as an NTC temperature sensor, a stable and precise temperature measurement circuit can be achieved.
  • the invention relates to a method for operating a hob according to one of the preceding claims. It is proposed that a temperature of cookware placed on the surface of the hob plate is detected by the temperature sensor and regulated to an adjustable value.
  • Fig. 1 shows a detail of a hob according to a first embodiment of the invention
  • Fig. 2 shows a detail of a hob according to a second embodiment of the invention, in which a temperature sensor is connected via a heat transfer element with a hob plate.
  • FIG. 1 shows a hob with a hob plate 10 with a top 12 for setting up cookware 18 and with a temperature sensor 16 arranged in a temperature sensor region 14 on the underside of the hob plate 10.
  • the hob plate 10 is made of a black glass ceramic in the illustrated embodiment comprises a total of four heating zones, in each of which in the center of the heating zone corresponding area of the top 12 opposite region of a bottom 20 similar temperature sensor areas 14 are incorporated.
  • temperature sensor regions 14 correspond at least substantially to the temperature sensor region 14 described below, wherein the dimensions of the temperature sensor regions 14 correspond to the dimensions of the heating zones and / or can be adapted to a heat output of heating elements arranged below the heating zones.
  • the hob plate 10 has a reduced material thickness m in the temperature sensor region 14 compared to a material thickness M of an environment of the temperature sensor region 14.
  • the temperature sensor portion 14 is formed as a recess 22 in the bottom 20 of the hob plate 10, which has the shape of a blind hole with a circular cross section and a flat bottom surface 24.
  • the diameter 26 of the recess 22 is more than 1, 5 times as large as the depth 28 of the recess 22.
  • the diameter 26 of the recess 22 12mm and the depth 28 of the recess 22 is 2.5mm.
  • the hob plate 10 formed as a rectangular plate has a material thickness M of 4 mm everywhere except for the temperature sensor portion 14. Therefore, the material thickness is m, i. the distance between the bottom surface 24 of the temperature sensor portion 14 and the top 12 of the hob plate 10, in the temperature sensor region 14 1, 5mm.
  • the diameter 26 of the recess 22 is three times as large as the material thickness M of the hob plate 10 in the vicinity of the temperature sensor region fourteenth
  • the temperature sensor 16 is arranged in the depression 22, in the sense that its front, cylindrical sensor region 30 of the temperature sensor 16 engages in the depression 22.
  • the diameter 32 of the temperature sensor 16 is 8 mm and is thus smaller than a diameter 26 of the recess 22.
  • the temperature sensor 16 is centrally and concentrically positioned in the recess 22, so that between the cylinder jacket-shaped outer surface of the temperature sensor 16 and the cylinder jacket-shaped inner edge surface of the recess 22nd or the blind hole an annular space 34 is formed, the radial thickness is 2mm. In other embodiments, the thickness of the gap 34 may assume other values, for example 0.2 mm, 1 mm or 5 mm.
  • the temperature sensor 16 is designed as an NTC temperature sensor 16 and comprises a thermistor component, not shown here, which is enclosed in an aluminum jacket.
  • the Thermistor component is connected via connecting cable with a measuring circuit, and a control unit, not shown here, picks up a voltage drop across the thermistor component or a current flowing through the thermistor component. From the detected value of the voltage or the current, the control unit determines the temperature of the bottom surface 24 of the depression 22 of the temperature sensor region 14 as a function of a predetermined characteristic.
  • the hob plate 10 When installing the hob, first the hob plate 10 is glued to a mounting frame, not shown here, which surrounds the hob plate 10 on all four sides.
  • the temperature sensor 16 is fixedly connected to one of the mounted in the installed state under the hob plate 10 and under the corresponding heating zones Indukomsweimplantation 36, which in turn are arranged on a Induktorwithout not shown here.
  • the hob plate 10 provided with the mounting frame is connected to the inductor carrier, the temperature sensors 16 being inserted into the recesses 22 of the respective temperature sensor regions 14.
  • the recesses 22 and / or the outer surfaces of the temperature sensors 16 may be provided with a thermal grease 38.
  • the space 34 prevents stresses in the hob plate 10, which would be caused by the different thermal expansion behavior of the outer jacket of the temperature sensor 16 and the ceramic material of the hob plate 10, if the temperature sensor 16 would be inserted without clearance 34 or without play in the temperature sensor area 14.
  • the gap 34 between the temperature sensor 16 and the hob plate 10 in the assembled state is best completely filled with the thermal grease 38.
  • the depression 22 or the blind hole is introduced into the hob plate 10 in a laser processing method.
  • the ceramic material is evaporated in the region of the focus of a preferably pulsed laser beam, and the focus is moved so that gradually the recess 22 is formed.
  • the edge surface of the recess 22 is prepared by laser engraving before the ceramic material is removed.
  • laser engraving the focus of the laser is moved into the interior of the glass-ceramic material, so that a small volume inside the glass-ceramic material is heated very rapidly and strongly. Microscopic cracks develop which destabilize the material in the affected area and facilitate the removal of the material.
  • the material thickness m of the hob plate 10 is less than half as large as the material thickness M of the hob plate 10 in the vicinity of the temperature sensor region 14 according to the dimensions given above in the temperature sensor region 14.
  • the material thickness of the hob plate 10 in the temperature sensor region 14 is in advantageous embodiments of the invention between 0 , 8mm and 1, 5mm and the material thickness M of the hob plate 10 in the vicinity of the temperature sensor area 14 is between 4mm and 7mm depending on the material used.
  • the diameter 26 of the temperature sensor region 14 of 12 mm is greater than the material thickness M of 4 mm of the hob plate 10 in the vicinity of the temperature sensor region 14.
  • the diameter 32 of the temperature sensor 16 in the plane of extension of the hob plate 10 is 8mm, so that in the assembled state there is a gap 34 between the outer shell or the radial outer surface of the temperature sensor 16 and the inner radial surface of the blind hole.
  • This gap 34 may be filled with the thermal grease 38.
  • the diameter of a sacklock-like depression of a temperature sensor region is 18 mm and the material thickness m in the region of the depression is 0.8 mm, so that the depth of the depression is 3.2 mm.
  • FIG. 2 shows an alternative embodiment of the invention in which the temperature sensor 16 is connected to the temperature sensor region 14 of the cooktop via a heat-conducting element 40.
  • plate 10 is thermally conductively connected.
  • the heat-conducting element 40 comprises a projection 42, the shape of which corresponds at least substantially to a negative shape of the recess 22, ie in the present case is cylindrical.
  • the projection 42 of the insert or heat-conducting element 40 engages in the recess 22.
  • the heat-conducting element 40 may be glued or otherwise connected to the hob plate 10 before assembly. This can be done simultaneously with the bonding of the hob plate 10 with the mounting frame, so that the heat-conducting element 40 and the temperature sensor 16 are brought together only when connecting the mounting frame with the inductor.
  • the inventive design of the hob allows the use of a method for operating a hob, in which a temperature of 18 placed on the surface of the hob plate cookware 18 is detected by the temperature sensor 16 and is controlled to an adjustable value. While previous temperature sensors under cooktop panels due to the low thermal conductivity of the ceramic material can measure only the temperature of the cooktop itself, but which can differ especially in induction cooktops from the temperature of the cookware, by means of the sensor arrangement according to the invention, a temperature value can be detected, which is very strong the actual temperature of the bottom of the cookware 18 is correlated. Only in this way is a method for operating a hob, in which a temperature of cookware 18 set up on the surface of hob plate 10 via temperature sensor 16 detected and regulated to an adjustable value, possible in a meaningful manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

L'invention concerne un table de cuisson dotée d'un plan de cuisson (10) présentant une face supérieure (12) pour poser un ustensile de cuisine (18) et une zone de détection de température (14) sur une face inférieure (20) du plan de cuisson (10) pour disposer un capteur de température (16). L'invention vise à équiper une table de cuisson du type générique d'un système détecteur de température amélioré. A cet effet, le plan de cuisson (10) présente dans la zone de détection de température (14) une épaisseur de matériau (m) réduite comparativement à l'épaisseur de matériau (M) dans l'environnement de la zone de détection de température (14).
PCT/EP2008/052255 2007-03-13 2008-02-25 Table de cuisson dotée d'une zone de détection de température WO2008110447A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112008000231T DE112008000231A5 (de) 2007-03-13 2008-02-25 Kochfeld mit einem Temperatursensorbereich

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200700755A ES2321261B1 (es) 2007-03-13 2007-03-13 Campo de coccion con una zona de sensor de temperatura.
ESP200700755 2007-03-13

Publications (2)

Publication Number Publication Date
WO2008110447A2 true WO2008110447A2 (fr) 2008-09-18
WO2008110447A3 WO2008110447A3 (fr) 2009-03-26

Family

ID=40469913

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/052255 WO2008110447A2 (fr) 2007-03-13 2008-02-25 Table de cuisson dotée d'une zone de détection de température

Country Status (3)

Country Link
DE (1) DE112008000231A5 (fr)
ES (1) ES2321261B1 (fr)
WO (1) WO2008110447A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014140388A1 (fr) * 2013-03-12 2014-09-18 FARRAS GASSO, Mª Teresa Plan de travail pour équipement à induction
EP4198400A1 (fr) * 2021-12-17 2023-06-21 BSH Hausgeräte GmbH Dispositif d'appareil ménager, appareil ménager et procédé de fonctionnement d'un dispositif d'appareil ménager

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8801334U1 (de) * 1988-02-03 1988-03-17 Bosch-Siemens Hausgeräte GmbH, 8000 München Kochfeld
EP0464323A2 (fr) * 1990-07-03 1992-01-08 Bosch-Siemens HausgerÀ¤te GmbH Plaque de cuisson
EP0639743A2 (fr) * 1993-08-18 1995-02-22 Bosch-Siemens HausgerÀ¤te GmbH Table de cuisson
WO2005069693A1 (fr) * 2004-01-15 2005-07-28 Miele & Cie. Kg Procede pour commander un processus de cuisson sur une table de cuisson et table de cuisson permettant de mettre en oeuvre ce procede
DE102004041007A1 (de) * 2004-08-16 2006-02-23 E.G.O. Elektro-Gerätebau GmbH Kochfeldplatte sowie Kochfeld mit einer solchen Kochfeldplatte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8801334U1 (de) * 1988-02-03 1988-03-17 Bosch-Siemens Hausgeräte GmbH, 8000 München Kochfeld
EP0464323A2 (fr) * 1990-07-03 1992-01-08 Bosch-Siemens HausgerÀ¤te GmbH Plaque de cuisson
EP0639743A2 (fr) * 1993-08-18 1995-02-22 Bosch-Siemens HausgerÀ¤te GmbH Table de cuisson
WO2005069693A1 (fr) * 2004-01-15 2005-07-28 Miele & Cie. Kg Procede pour commander un processus de cuisson sur une table de cuisson et table de cuisson permettant de mettre en oeuvre ce procede
DE102004041007A1 (de) * 2004-08-16 2006-02-23 E.G.O. Elektro-Gerätebau GmbH Kochfeldplatte sowie Kochfeld mit einer solchen Kochfeldplatte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014140388A1 (fr) * 2013-03-12 2014-09-18 FARRAS GASSO, Mª Teresa Plan de travail pour équipement à induction
EP4198400A1 (fr) * 2021-12-17 2023-06-21 BSH Hausgeräte GmbH Dispositif d'appareil ménager, appareil ménager et procédé de fonctionnement d'un dispositif d'appareil ménager

Also Published As

Publication number Publication date
WO2008110447A3 (fr) 2009-03-26
ES2321261B1 (es) 2010-03-04
DE112008000231A5 (de) 2010-04-15
ES2321261A1 (es) 2009-06-03

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