WO2002097333A2 - Wärmezustandsanzeige bei einer gaskochstelle - Google Patents
Wärmezustandsanzeige bei einer gaskochstelle Download PDFInfo
- Publication number
- WO2002097333A2 WO2002097333A2 PCT/EP2002/005626 EP0205626W WO02097333A2 WO 2002097333 A2 WO2002097333 A2 WO 2002097333A2 EP 0205626 W EP0205626 W EP 0205626W WO 02097333 A2 WO02097333 A2 WO 02097333A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermocouple
- signal
- flame
- burner
- thermocouple signal
- Prior art date
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
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
Definitions
- the invention relates to a gas hob with at least one burner with an associated thermocouple for flame monitoring, which generates a thermocouple signal as a function of a flame of the burner and controls an electromagnetic valve which is arranged in a gas supply line leading to the burner.
- a glass ceramic cooktop with a cooking surface and at least one cooking zone which comprises an open, atmospheric gas burner as the focal point, and with a display device assigned to the cooking zone, which displays the the measurement signals processed by means of a suitable evaluation circuit are controlled by temperature sensors.
- the temperature sensors are mounted in the area of the burner body of the gas burner and are connected to this burner body directly, for example by screwing on or clamping or gluing to the burner body itself or indirectly, for example on the burner ring.
- a system is known from EP 0 918 196 for displaying the residual heat of at least one pot grate for a gas burner in a household cooking appliance.
- the gas burner is controlled by means of an electronic control device, the residual heat of the grate being measured indirectly by means of the electronic control device on the basis of data relating to the burner's power level set and to the length of time during which the power level is maintained. This data is corrected with the aid of a factor that takes into account the physical characteristics of the pot grate, so that a warning light is activated to indicate the residual heat if the residual heat of the pot grate exceeds a predetermined safety threshold.
- the object of the invention is to provide a gas hob in which a heat state of the gas hob can be displayed using simple means and in a simple method.
- the object of the invention is achieved by a gas hob with the features of claim 1 and by a method with the features of claim 7.
- the thermocouple is connected via a signal path to a heat display unit which, depending on the size of a thermocouple signal, indicates a thermal state of the gas hob.
- the thermocouple signal of the thermocouple not only serves to control an electromagnetic safety valve, but also to indicate the heat status of the gas hob.
- an additional temperature sensor in the area of the gas hob can be dispensed with and a reliable statement about the heat status of the gas hob can nevertheless be achieved.
- the residual heat of the gas hotplate can be displayed after a flame extinction on the burner.
- the fact is used that the size of the thermocouple signal after flame extinction not jumped to its zero value Rather, heat is transferred from the heated neighboring components, such as the burner body or the carrier grate, to the thermocouple, so that the thermocouple generates a thermocouple signal even after the flame has been extinguished , from.
- thermocouple signal As soon as the size of the thermocouple signal has fallen below a safety threshold, a warning signal, for example an optical or acoustic signal, goes out in the heat display unit. As a result, the user realizes that there is no fear of residual heat at the gas hob.
- the heat display unit can also have a segment display in which a number of segments light up depending on the size of the thermocouple signal.
- Optical warning displays can also be used which change their brightness depending on the size of the thermocouple signal.
- thermocouple signal After the flame has been extinguished, the course of the size of the thermocouple signal following an e-function is subject to greater fluctuations, which are caused by external influences. In order nevertheless to obtain a meaningful course of the thermocouple signal, it can be advantageous to follow the course of the Editing thermocouple signal, e.g. smoothing.
- an electronic evaluation unit is inserted in the signal path between the thermocouple and the heat display unit, which records the size of the thermocouple signal, processes it accordingly, in particular smoothes it, and forwards the smoothed thermocouple signal to the heat display unit.
- the electronic evaluation unit detects the quantities of the thermocouple signal within a detection time interval after the flame is extinguished and calculates a theoretical one
- Thermocouple waveform after flame extinction that follows an e-function.
- the heat display unit receives reliable information about the heat status of the gas hob even after the flame has been extinguished
- a start time of the detection time interval is preferably as close as possible to the time the flame is extinguished.
- the start of the detection time interval is, for example, between one and four minutes after the flame is extinguished.
- no sensible detection of the thermocouple signal is possible within about a minute after the flame has been extinguished, since the gradient of the thermocouple signal is too large for reliable calculation of the theoretical thermocouple signal curve.
- the start time of the detection time interval can be set at a time at which the size of the thermocouple signal is approximately 80-90% of the size of the thermocouple signal T when the flame is extinguished, while the detection time interval ends at a time at which the size of the thermocouple signal T is approximately 50% of the size of the thermocouple signal T is when the flame is extinguished.
- Figure 1 is a block diagram of a gas hob in a schematic
- FIG. 2 shows a course of a thermocouple signal T before and after the
- thermocouple signal curve Tu Flame extinguishing on a burner in the gas hob and a theoretical thermocouple signal curve Tu, according to
- the gas hob shown in FIG. 1 has a burner 1, above which a T-rack grate 2 arranged on which a food container (not shown) can be placed.
- the burner 1 is supplied with gas via a gas feed line 3.
- An electromagnetic valve 5, which is controlled by an electronic evaluation unit 15, is arranged in the gas feed line 3.
- the gas volume flow in the gas supply line 3 required for a desired burner heating power can be adjusted by a gas tap 7 which can be actuated with a rotary knob 11.
- a signal transmitter 9 is coupled to the rotary knob 11 and is in a signal connection with the electronic evaluation unit 15 via lines 13.
- the gas filter is also provided with a thermocouple 27 for flame monitoring, with which the presence of a flame on the burner 1 is detected.
- the thermocouple 27 has a corresponding material pair, in which a thermal voltage or a thermal current is generated as a function of a thermal state of the thermocouple 27 and which is conducted as a thermocouple signal T via a signal line 25 to the electronic evaluation unit 15.
- the electronic evaluation unit 15 is also in signal connection via a line 17 with an ignition device 19, which can control an ignition electrode 23 in order to ignite a flame on the burner 1.
- thermocouple 27 is in a signal connection with the heat display unit 31. That is, the thermocouple signal T from the thermocouple 27 via a line 25 into the electronic display unit 15 and from there it is fed to the heat display unit 31.
- the thermocouple signal T is optionally processed, for example smoothed or filtered, and then the processed thermocouple signal is passed on to the heat display unit 31.
- a power supply unit not shown, supplies the supply voltage for the electronic evaluation unit 15.
- the burner 1 of the gas hob is put into operation by a pushing or rotating movement of the rotary knob 11. Corresponding signals are thereby generated by the signal generator 9 and passed via the lines 13 to the electronic evaluation unit 15.
- the electronic evaluation unit 15 detects the signals of the signal transmitter 9, and controls the ignition device at 19, the ignition electrode 23, a flame - am - burner 1 - ignites - applied simultaneity - the - electronic "evaluation unit 15, the solenoid valve 5 with an external current to to open the gas supply line 3 to the burner 1. After the gas has ignited on the burner 1, the thermocouple 27 is heated by the flame of the burner 1.
- thermocouple signal T generated thereby ie the thermal voltage or the thermal current
- the thermocouple signal T is sent to the electronic evaluation unit 15 and from there off to the solenoid valve 5.
- the thermocouple signal has exceeded a certain size, it takes over the function of the external current and keeps the solenoid valve 5 open.
- thermocouple 27 After the flame on the burner 1 has been extinguished, the thermocouple 27 cools down, as a result of which the size of the thermocouple signal T is reduced. If the size of the thermocouple signal T falls below a value defined in the electronic evaluation unit 15, the electronic evaluation unit 15 closes the solenoid valve 5 and thus blocks the gas supply line 3.
- thermocouple signal T before and after flame extinction is shown in the diagram according to FIG. 2. It can be seen from this that the thermocouple signal T does not suddenly drop to a zero value at the time of the flame extinction. Rather, the thermocouple signal T gradually drops to zero, since it absorbs heat from neighboring components, such as burner 1 and support grate-2, even after the flame has been extinguished. It follows that the course of the Thermocouple signal T essentially follows an e-function in a cooling phase of the gas hob.
- thermocouple signal T is processed in the electronic evaluation unit 15 in order to smooth fluctuations in the signal profile, in particular after a flame has been extinguished or during a cooling phase of the gas hob.
- the electronic evaluation unit 15 detects the quantities of the thermocouple signal T in a detection time interval MM 2 after the flame has been extinguished and calculates an e-function from these quantities, which represents a theoretical thermocouple signal curve T th during the cooling phase.
- the electronic evaluation unit 15 forwards signals to the heat display unit 31, in which the heat state of the gas hob is displayed in accordance with the theoretical thermocouple signal curve Tu.
- a warning signal from the heat indicator unit 31 goes out after the theoretical thermocouple signal curve T th has fallen below a safety threshold value S1 defined in the evaluation unit 15. As a result, the user realizes that there is no fear of residual heat at the gas hob.
- the length of the acquisition time interval MM 2 is at least 20 seconds.
- the detection time interval MM 2 starts at a time which is between 1 min and 4 min after the flame has been extinguished.
- the start of the detection time interval is set to a time at which the size of the thermocouple signal is approximately 80-90% of the size of the thermocouple signal T when the flame is extinguished, while the detection time interval ends at a time at which the size of the thermocouple signal T is approximately 50 % of the size of the thermocouple signal T is when the flame is extinguished.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02747319A EP1395779A2 (de) | 2001-05-25 | 2002-05-22 | Wärmezustandsanzeige bei einer gaskochstelle |
AU2002317755A AU2002317755A1 (en) | 2001-05-25 | 2002-05-22 | Heat status display for a gas cooker point |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01440145 | 2001-05-25 | ||
EP01440145.9 | 2001-05-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002097333A2 true WO2002097333A2 (de) | 2002-12-05 |
WO2002097333A3 WO2002097333A3 (de) | 2003-05-01 |
Family
ID=8183224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/005626 WO2002097333A2 (de) | 2001-05-25 | 2002-05-22 | Wärmezustandsanzeige bei einer gaskochstelle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1395779A2 (de) |
AU (1) | AU2002317755A1 (de) |
WO (1) | WO2002097333A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2243145A1 (es) * | 2005-02-21 | 2005-11-16 | Bsh Electrodomesticos España, S.A. | Aparato de gas, en particular una placa de cocina de gas. |
US8307817B2 (en) | 2008-03-07 | 2012-11-13 | E.G.O. Elektro-Geraetebau Gmbh | Gas burner module for a gas cooktop, and gas cooktop |
EP3147566A1 (de) | 2015-09-22 | 2017-03-29 | Electrolux Appliances Aktiebolag | Gasbrenneranordnung für eine gaskochvorrichtung mit thermoelement |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0698214A1 (de) * | 1994-03-02 | 1996-02-28 | Abbott Laboratories | Hiv immunoassay unter verwendung rekombinanter proteine und synthetischer peptidreagenzien |
DE19646959A1 (de) * | 1996-11-13 | 1998-05-14 | Schott Glaswerke | Glaskeramikkochfeld mit sensorgesteuerten Anzeigeeinrichtungen für offene, atmosphärische Gasbrenner als Brennstellen umfassende Kochzonen und Verwendung solcher Sensoren |
EP0918196A2 (de) * | 1997-11-21 | 1999-05-26 | Whirlpool Corporation | Anzeigevorrichtung für die Restwärme von Topfträger bei Haushaltgaskochern |
FR2809164A1 (fr) * | 2000-05-19 | 2001-11-23 | Brandt Cooking | Systeme de visualisation de chaleur residuelle pour bruleur a gaz domestique |
-
2002
- 2002-05-22 WO PCT/EP2002/005626 patent/WO2002097333A2/de not_active Application Discontinuation
- 2002-05-22 AU AU2002317755A patent/AU2002317755A1/en not_active Abandoned
- 2002-05-22 EP EP02747319A patent/EP1395779A2/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0698214A1 (de) * | 1994-03-02 | 1996-02-28 | Abbott Laboratories | Hiv immunoassay unter verwendung rekombinanter proteine und synthetischer peptidreagenzien |
DE19646959A1 (de) * | 1996-11-13 | 1998-05-14 | Schott Glaswerke | Glaskeramikkochfeld mit sensorgesteuerten Anzeigeeinrichtungen für offene, atmosphärische Gasbrenner als Brennstellen umfassende Kochzonen und Verwendung solcher Sensoren |
EP0918196A2 (de) * | 1997-11-21 | 1999-05-26 | Whirlpool Corporation | Anzeigevorrichtung für die Restwärme von Topfträger bei Haushaltgaskochern |
FR2809164A1 (fr) * | 2000-05-19 | 2001-11-23 | Brandt Cooking | Systeme de visualisation de chaleur residuelle pour bruleur a gaz domestique |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2243145A1 (es) * | 2005-02-21 | 2005-11-16 | Bsh Electrodomesticos España, S.A. | Aparato de gas, en particular una placa de cocina de gas. |
US8307817B2 (en) | 2008-03-07 | 2012-11-13 | E.G.O. Elektro-Geraetebau Gmbh | Gas burner module for a gas cooktop, and gas cooktop |
DE102008014841B4 (de) * | 2008-03-07 | 2015-05-28 | E.G.O. Elektro-Gerätebau GmbH | Gasbrenner-Modul für ein Gaskochfeld sowie Gaskochfeld |
EP3147566A1 (de) | 2015-09-22 | 2017-03-29 | Electrolux Appliances Aktiebolag | Gasbrenneranordnung für eine gaskochvorrichtung mit thermoelement |
Also Published As
Publication number | Publication date |
---|---|
WO2002097333A3 (de) | 2003-05-01 |
AU2002317755A1 (en) | 2002-12-09 |
EP1395779A2 (de) | 2004-03-10 |
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