EP0939578B1 - Screen printed heating device and manufacturing method therefor - Google Patents
Screen printed heating device and manufacturing method therefor Download PDFInfo
- Publication number
- EP0939578B1 EP0939578B1 EP19990400441 EP99400441A EP0939578B1 EP 0939578 B1 EP0939578 B1 EP 0939578B1 EP 19990400441 EP19990400441 EP 19990400441 EP 99400441 A EP99400441 A EP 99400441A EP 0939578 B1 EP0939578 B1 EP 0939578B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- track
- heating
- thermostat
- resistive
- resistivity
- 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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0269—For heating of fluids
-
- 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
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
-
- 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
- H05B3/78—Heating arrangements specially adapted for immersion heating
- H05B3/82—Fixedly-mounted immersion heaters
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/013—Heaters using resistive films or coatings
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/021—Heaters specially adapted for heating liquids
Definitions
- the present invention relates to a device for electric heating with screen-printed heating track.
- It also relates to a heated bottom, especially for an electric kettle, and a method of manufacture of such an electric heating device.
- Resistive tracks formed of a circuit thick film print on a good substrate thermal conductor heat the substrate when an electric current is distributed in these resistive tracks.
- the main quality of these elements screen printed is to present a very low inertia thermal.
- a thermostat is installed on resistive tracks heating, through insulation electric.
- the tracks resistives work at a stable temperature, which can be between 170 ° C and 230 ° C, depending on the substrate size and power.
- the set temperature of this thermostat must be such that it does not cut off the power supply when there is water, but it cuts it quickly, as soon as the temperature of the resistive track rises during a lack of water.
- the object of the present invention is to resolve the aforementioned drawbacks by allowing the use of standard thermostats as safety devices in heating devices with screen printed tracks.
- the electric heater includes a screen-printed heating track and a thermostat suitable for cutting the power supply to the track heating above a set temperature.
- this heating device is characterized in that at least a portion of the track conductive, with lower resistivity than resistivity of the heating track, is screen printed on an area of heating track, the thermostat being fixed in contact thermal with the heating track at the level of said zoned.
- the thermostat can be adjusted.
- a standard thermostat having a temperature of setpoint 10 ° to 60 ° C lower than the temperature of the heating track, can be used.
- a device for electric heating comprises a substrate 1 on which a resistive track 5 capable of heat up during the passage of an electric current.
- the resistive track is in known manner made of enamel loaded with silver particles and of palladium.
- the resistive track thus appears under the form of a thick film printed circuit, constituting generally a substantially symmetrical design by relative to a median axis of the substrate 1.
- the substrate 1 is intended to forming the heating base of an electrical appliance, such a kettle, the upper face of the substrate 1, opposite to that receiving the resistive track 5, being adapted to be in contact with the water to be heated.
- the substrate 1 generally consists of a metal good conductor of heat and covered with one or several layers of a dielectric material on which the resistive track is screen printed.
- the dielectric material can also be deposited by screen printing on one side of the support metallic.
- the conductive track is constituted enamel heavily loaded with silver particles, substantially zero resistivity.
- the pads 6 thus formed in conductive paste are non-heating zones.
- the disjoint portions of conductive track 6 are regularly arranged on the length of the resistive track 5, over portions parallels of concentric arcs formed by the resistive track 5.
- a thermostat 3 is fixed in thermal contact with the resistive track heating 5 in this zone A at temperature adjusted.
- thermostat 3 is fixed through an electrical insulator 2, as shown in Figure 3, and connection tabs 4 allow mounting thermostat 3 on the circuit resistive track power supply 5.
- Thermostat 3 is suitable for cutting the electrical supply of the heating track 5 beyond a predetermined set temperature.
- the resistive track 5 heats up to a temperature between 170 ° C and 230 ° C, the temperature of the resistive track 5 in the zone of the thermostat 3 is lowered.
- a standard thermostat, less expensive, calibrated to a lower set temperature can be used whatever the power required for the device electric heating.
- the set temperature may be lower from 10 ° to 60 ° C relative to the track temperature heating 5, depending on the proportion of conductive surface 6.
- This screen printing process is simple to put on in action.
- step b we also screen print electrical connection pads 7 of the heating track 5.
- This process is particularly well suited to the production of a kettle heating base electric: starting from a flat metal support, we successively deposits one or more layers of a electrically insulating material, then a track resistive heater 5 in the form of a circuit printed and finally one or more track portions conductive 6 to adjust the temperature of the area intended to receive a thermostat 3.
- a single portion of conductive track could be screen printed on part of the track resistive.
- the conductive track 6 could be screen printed directly on the dielectric layer of the substrate 1, the resistive heating track 6 being then screen printed.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Surface Heating Bodies (AREA)
- Control Of Resistance Heating (AREA)
Description
La présente invention concerne un dispositif de chauffage électrique à piste chauffante sérigraphiée.The present invention relates to a device for electric heating with screen-printed heating track.
Elle concerne également un fond chauffant, notamment pour bouilloire électrique, et un procédé de fabrication d'un tel dispositif de chauffage électrique.It also relates to a heated bottom, especially for an electric kettle, and a method of manufacture of such an electric heating device.
L'utilisation d'éléments chauffants sérigraphiés est connue, notamment dans les bouilloires électriques.The use of screen-printed heating elements is known, especially in electric kettles.
Des pistes résistives formées d'un circuit imprimé à film épais réalisé sur un substrat bon conducteur thermique permettent de chauffer le substrat lorsqu'un courant électrique est distribué dans ces pistes résistives. La principale qualité de ces éléments sérigraphiés est de présenter une très faible inertie thermique.Resistive tracks formed of a circuit thick film print on a good substrate thermal conductor heat the substrate when an electric current is distributed in these resistive tracks. The main quality of these elements screen printed is to present a very low inertia thermal.
Il est connu de chercher à protéger ces pistes contre des surchauffes accidentelles, telles qu'elles se produisent par exemple lors du fonctionnement sans eau dans une bouilloire.It is known to seek to protect these tracks against accidental overheating, such as occur for example during operation without water in a kettle.
Dans des dispositifs de chauffage classiques, un thermostat est mis en place sur des pistes résistives chauffantes, par l'intermédiaire d'un isolant électrique.In conventional heaters, a thermostat is installed on resistive tracks heating, through insulation electric.
Dans le cas d'une bouilloire, lorsqu'il y a de l'eau en contact avec le substrat chauffant, les pistes résistives travaillent à une température stable, qui peut être comprise entre 170°C et 230°C, selon la dimension du substrat et la puissance.In the case of a kettle, when there is water in contact with the heating substrate, the tracks resistives work at a stable temperature, which can be between 170 ° C and 230 ° C, depending on the substrate size and power.
Lorsqu'il n'y a plus d'eau, les pistes montent rapidement en température, car le substrat n'est plus refroidi, et le thermostat coupe alors l'alimentation électrique de la piste résistive chauffante.When there is no more water, the tracks go up quickly in temperature, because the substrate is no longer cooled, and the thermostat then turns off the power of the resistive heating track.
La température de consigne de ce thermostat doit être telle qu'il ne coupe pas l'alimentation électrique lorsqu'il y a de l'eau, mais qu'il la coupe rapidement, dès que la température de la piste résistive s'élève lors d'un manque d'eau.The set temperature of this thermostat must be such that it does not cut off the power supply when there is water, but it cuts it quickly, as soon as the temperature of the resistive track rises during a lack of water.
Du fait de la température élevée des pistes résistives, il est nécessaire d'utiliser des thermostats spécifiques, à température de consigne élevée, ce qui augmente le prix de revient des dispositifs de chauffage.Due to the high temperature of the slopes resistive, it is necessary to use thermostats specific, at high set temperature, which increases the cost price of the heater.
La présente invention a pour but de résoudre les inconvénients précités en permettant l'utilisation de thermostats standards comme organes de sécurité dans des dispositifs de chauffage à pistes sérigraphiées.The object of the present invention is to resolve the aforementioned drawbacks by allowing the use of standard thermostats as safety devices in heating devices with screen printed tracks.
Le dispositif de chauffage électrique comprend une piste chauffante sérigraphiée et un thermostat adapté à couper l'alimentation électrique de la piste chauffante au-delà d'une température de consigne.The electric heater includes a screen-printed heating track and a thermostat suitable for cutting the power supply to the track heating above a set temperature.
Selon l'invention, ce dispositif de chauffage est caractérisé en ce qu'au moins une portion de piste conductrice, de résistivité inférieure à la résistivité de la piste chauffante, est sérigraphiée sur une zone de piste chauffante, le thermostat étant fixé en contact thermique avec la piste chauffante au niveau de ladite zone.According to the invention, this heating device is characterized in that at least a portion of the track conductive, with lower resistivity than resistivity of the heating track, is screen printed on an area of heating track, the thermostat being fixed in contact thermal with the heating track at the level of said zoned.
Ainsi, la température de la zone où est mis en place le thermostat peut être réglée. En disposant une piste conductrice de résistivité inférieure, on abaisse localement la température de la zone recevant le thermostat.So the temperature of the area where is set place the thermostat can be adjusted. By having a conductive track of lower resistivity, we lower locally the temperature of the area receiving the thermostat.
Un thermostat standard, ayant une température de consigne inférieure de 10° à 60°C par rapport à la température de la piste chauffante, peut être utilisé.A standard thermostat, having a temperature of setpoint 10 ° to 60 ° C lower than the temperature of the heating track, can be used.
Selon une autre aspect de l'invention, un
procédé pour fabriquer un dispositif de chauffage est
caractérisé en ce qu'il comporte les étapes suivantes :
D'autres particularités et avantages de l'invention apparaítront encore dans la description ci-après.Other features and advantages of the invention will appear further in the description below.
Aux dessins annexés, donnés à titre d'exemples non limitatifs :
- la figure 1, est une vue d'un dispositif de chauffage conforme à l'invention, le thermostat étant ôté ;
- la figure 2 est une vue analogue à la figure 1, avec le thermostat ; et
- la figure 3 est une vue en coupe selon la ligne III-III à la figure 2.
- Figure 1 is a view of a heating device according to the invention, the thermostat being removed;
- Figure 2 is a view similar to Figure 1, with the thermostat; and
- FIG. 3 is a sectional view along line III-III in FIG. 2.
En référence à la figure 1, un dispositif de
chauffage électrique comprend un substrat 1 sur lequel
est sérigraphiée une piste résistive 5 susceptible de
s'échauffer lors du passage d'un courant électrique.With reference to FIG. 1, a device for
electric heating comprises a
La piste résistive est de manière connue constituée d'un émail chargé en particules d'argent et de palladium.The resistive track is in known manner made of enamel loaded with silver particles and of palladium.
La piste résistive se présente ainsi sous la
forme d'un circuit imprimé à film épais, constituant
généralement un dessin sensiblement symétrique par
rapport à un axe médian du substrat 1.The resistive track thus appears under the
form of a thick film printed circuit, constituting
generally a substantially symmetrical design by
relative to a median axis of the
Dans cet exemple, le substrat 1 est destiné à
former le fond chauffant d'un appareil électrique, tel
qu'une bouilloire, la face supérieure du substrat 1,
opposée à celle recevant la piste résistive 5, étant
adaptée à être en contact avec l'eau à chauffer.In this example, the
Le substrat 1 est généralement constitué d'un
métal bon conducteur de la chaleur et recouvert d'une ou
plusieurs couches d'un matériau diélectrique sur lequel
est sérigraphiée la piste résistive.The
Le matériau diélectrique peut également être déposé par sérigraphie sur une face du support métallique.The dielectric material can also be deposited by screen printing on one side of the support metallic.
Plusieurs portions 6 disjointes de piste conductrice sont disposées, par sérigraphie, sur une zone A de la piste chauffante, la résistivité de la piste conductrice étant inférieure à la résistivité de la piste chauffante.Several 6 disjoint portions of track conductive are arranged, by screen printing, on a zone A of the heating strip, the resistivity of the conductive track being less than the resistivity of the heating track.
Ces portions de piste conductrice permettent
d'abaisser localement la température dans une zone A de
la piste résistive, en court-circuitant le courant
électrique qui circule dans la piste résistive 5.These portions of conductive track allow
to locally lower the temperature in zone A of
the resistive track, by short-circuiting the current
electric which circulates in the
De préférence, la piste conductrice est constituée d'un émail fortement chargé en particules d'argent, de résistivité sensiblement nulle.Preferably, the conductive track is constituted enamel heavily loaded with silver particles, substantially zero resistivity.
Les plots 6 ainsi formés en pâte conductrice
sont des zones non chauffantes.The
Dans un tel exemple, les portions disjointes de
piste conductrice 6 sont disposées régulièrement sur la
longueur de la piste résistive 5, sur des portions
parallèles d'arcs de cercle concentriques formés par la
piste résistive 5.In such an example, the disjoint portions of
Dans la zone A de la piste chauffante 5 ainsi
pourvue de plots conducteurs 6, la température
correspond sensiblement à la moyenne des zones chaudes
de piste résistive 5 et des zones froides formées des
plots conducteurs 6.In zone A of the
En ajustant la proportion de surface conductrice
6 par rapport à la surface résistive chauffante, on peut
régler la température dans une zone A du dispositif de
chauffage.By adjusting the proportion of
Comme illustré à la figure 2, un thermostat 3
est fixé en contact thermique avec la piste résistive
chauffante 5 au niveau de cette zone A à température
ajustée.As illustrated in Figure 2, a
De manière classique, le thermostat 3 est fixé
par l'intermédiaire d'un isolant électrique 2, comme
représenté à la figure 3, et des pattes de connexion 4
permettent de monter le thermostat 3 sur le circuit
électrique d'alimentation de la piste résistive 5.Conventionally,
Le thermostat 3 est adapté à couper
l'alimentation électrique de la piste chauffante 5 au-delà
d'une température de consigne prédéterminée.Thermostat 3 is suitable for cutting
the electrical supply of the
Alors que la piste résistive 5 s'échauffe à une
température comprise entre 170°C et 230°C, la
température de la piste résistive 5 dans la zone du
thermostat 3 est abaissée.While the
Un thermostat standard, moins coûteux, calibré à une température de consigne plus basse est utilisable quelle que soit la puissance requise pour le dispositif de chauffage électrique.A standard thermostat, less expensive, calibrated to a lower set temperature can be used whatever the power required for the device electric heating.
La température de consigne peut être inférieure
de 10° à 60°C par rapport à la température de la piste
chauffante 5, selon la proportion de surface conductrice
6.The set temperature may be lower
from 10 ° to 60 ° C relative to the
Le procédé pour fabriquer un tel dispositif de
chauffage comporte les étapes suivantes :
Ce procédé par sérigraphie est simple à mettre en oeuvre.This screen printing process is simple to put on in action.
Lorsque la piste conductrice 6 est de même
nature que les plots de connexion électrique 7 de la
piste chauffante 5, il n'est pas nécessaire d'effectuer
une passe supplémentaire par rapport aux procédés
classiques de fabrication par sérigraphie d'un
dispositif de chauffage usuel.When the
Ainsi, à l'étape b, on sérigraphie en outre des
plots de connexion électrique 7 de la piste chauffante
5.Thus, in step b, we also screen print
Ce procédé est particulièrement bien adapté à la
fabrication d'un fond chauffant de bouilloire
électrique : en partant d'un support métallique plat, on
dépose successivement une ou plusieurs couches d'un
matériau électriquement isolant, puis une piste
résistive chauffante 5 sous la forme d'un circuit
imprimé et enfin une ou plusieurs portions de piste
conductrice 6 afin d'ajuster la température de la zone
destinée à recevoir un thermostat 3.This process is particularly well suited to the
production of a kettle heating base
electric: starting from a flat metal support, we
successively deposits one or more layers of a
electrically insulating material, then a track
Bien entendu, l'invention n'est pas limitée à l'exemple que l'on vient de décrire et on peut apporter à celui-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to the example that we just described and we can bring to this one many modifications without leaving the part of the invention.
Ainsi, une portion unique de piste conductrice pourrait être sérigraphiée sur une partie de la piste résistive.Thus, a single portion of conductive track could be screen printed on part of the track resistive.
En outre, la piste conductrice 6 pourrait être
sérigraphiée directement sur la couche diélectrique du
substrat 1, la piste résistive chauffante 6 étant
sérigraphiée ensuite.In addition, the
Claims (7)
- Electrical heater comprising a screen-printed heating track (5) and a thermostat (3) suitable for cutting off the electrical supply to the heating track (5) above a setpoint temperature, characterized in that at least one conducting track portion (6), of lower resistivity than the resistivity of the heating track (5), is screen-printed on a region (A) of the said heating track (5), the thermostat (3) being fastened in thermal contact with the said heating track (5) in the said region (A).
- Heater according to Claim 1, characterized in that the resistivity of the conducting track (6) is practically zero.
- Heater according to either of Claims 1 and 2, characterized in that it includes several discrete conducting track portions (6).
- Heater according to one of Claims 1 to 3, characterized in that discrete conducting track portions (6) are arranged uniformly over the length of a resistive track (5).
- Process for manufacturing a heater according to one of Claims 1 to 4, characterized in that it includes the following steps:a) screen printing of a heating resistive track (5) on a substrate (1);b) screen printing of at least one conducting track portion (6), of lower resistivity than the resistivity of the heating track, on a region (A) of the heating track (5); andc) fastening of a thermostat (3) in the said region (A) of the heating track (5).
- Process according to Claim 5, characterized in that, in step b), electrical connection pads (7) for connecting the heating track (5) are also screen-printed.
- Heating base, especially for an electric kettle, characterized in that it includes a heater according to one of Claims 1 to 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9802355A FR2775411B1 (en) | 1998-02-26 | 1998-02-26 | HEATED TRACK HEATING DEVICE AND METHOD FOR MANUFACTURING SUCH A DEVICE |
| FR9802355 | 1998-02-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0939578A1 EP0939578A1 (en) | 1999-09-01 |
| EP0939578B1 true EP0939578B1 (en) | 2002-05-08 |
Family
ID=9523412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19990400441 Expired - Lifetime EP0939578B1 (en) | 1998-02-26 | 1999-02-23 | Screen printed heating device and manufacturing method therefor |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0939578B1 (en) |
| DE (1) | DE69901406T2 (en) |
| FR (1) | FR2775411B1 (en) |
| RU (1) | RU2226750C2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10103299B4 (en) * | 2001-01-25 | 2010-08-05 | BSH Bosch und Siemens Hausgeräte GmbH | Kochmuldenheizvorrichtung |
| ES2564760B1 (en) * | 2014-09-24 | 2017-01-04 | BSH Electrodomésticos España S.A. | Home appliance device and procedure for manufacturing a home appliance device |
| DE102021211121A1 (en) * | 2021-10-01 | 2023-04-06 | E.G.O. Elektro-Gerätebau GmbH | Heater and method of manufacturing a heater |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2308921B (en) * | 1993-10-21 | 1997-09-17 | Otter Controls Ltd | Improvements relating to controls for electrical heating elements |
| GB9423900D0 (en) * | 1994-11-26 | 1995-01-11 | Pifco Ltd | Improvements to thick film elements |
| GB2318713B (en) * | 1996-10-22 | 2000-07-12 | Strix Ltd | Electric heaters |
-
1998
- 1998-02-26 FR FR9802355A patent/FR2775411B1/en not_active Expired - Fee Related
-
1999
- 1999-02-23 DE DE1999601406 patent/DE69901406T2/en not_active Expired - Lifetime
- 1999-02-23 EP EP19990400441 patent/EP0939578B1/en not_active Expired - Lifetime
- 1999-02-26 RU RU99103925/09A patent/RU2226750C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2775411A1 (en) | 1999-08-27 |
| DE69901406T2 (en) | 2002-10-02 |
| EP0939578A1 (en) | 1999-09-01 |
| RU2226750C2 (en) | 2004-04-10 |
| FR2775411B1 (en) | 2000-04-14 |
| DE69901406D1 (en) | 2002-06-13 |
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