EP0433968B1 - Microwave household appliance - Google Patents
Microwave household appliance Download PDFInfo
- Publication number
- EP0433968B1 EP0433968B1 EP90124564A EP90124564A EP0433968B1 EP 0433968 B1 EP0433968 B1 EP 0433968B1 EP 90124564 A EP90124564 A EP 90124564A EP 90124564 A EP90124564 A EP 90124564A EP 0433968 B1 EP0433968 B1 EP 0433968B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microwave
- protection tube
- sensor protection
- temperature sensor
- tubular heater
- 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
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
- H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors
-
- 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
- F24C7/06—Arrangement or mounting of electric heating elements
Definitions
- the invention relates to a microwave domestic appliance with a thermal heating device with a tubular heater and microwave heating device, wherein a temperature sensor is arranged as a setpoint generator for controlling the thermal heating device.
- DE-U-88 12 765 shows the connection of a radiant heater with a temperature sensor protective tube
- the object of the invention is that the temperature sensor located in a sensor protection tube is connected to the grill body in such a way that no temperature distortion occurs in combined heating operation (microwave and thermal heating).
- a muffle wall 1 which has an enamel layer 2 on the oven side, is a fastening surface for a flange 3.
- a sensor protection tube 4 and a tubular heating element 5 are attached to the flange 3 mechanically and microwave-specifically fixed.
- the sensor protection tube 4 and the tubular heating element 5 are connected to one another by the flange 3 of the grill body.
- the electrical connection of the flange to the muffle is achieved by capacitive coupling. In the high-frequency field, the flange 3 is therefore at a defined potential.
- the parts of the tubular heating element 5 and the sensor protection tube 4 projecting parallel into the muffle act like a line short-circuited at the end. At the end of this, a current maximum occurs.
- the controller characteristic is therefore not affected by microwave operation.
- Q function of x.
- Q is the amount of heat absorbed by the carrier 6 by microwave energy when this carrier 6 is moved in the x direction.
- x (1/4 + n ⁇ 1/2) ⁇ there is a thermal energy minimum, since there are zero crossings for the induced cross current.
- n 0.1.2 ...
- ⁇ wavelength of the radio frequency used.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Resistance Heating (AREA)
Description
Die Erfindung bezieht sich auf ein Mikrowellen-Haushaltgerät mit thermischer Heizeinrichtung mit einem Rohrheizkörper und Mikrowellenheizeinrichtung, wobei ein Temperaturfühler als Sollwertgeber für die Steuerung der thermischen Heizeinrichtung angeordnet ist.The invention relates to a microwave domestic appliance with a thermal heating device with a tubular heater and microwave heating device, wherein a temperature sensor is arranged as a setpoint generator for controlling the thermal heating device.
Aus der DE-U-88 12 765 ist die Verbindung eines Strahlungsheizkörpers mit einem Temperaturfühler-Schutzrohr entnehmbarDE-U-88 12 765 shows the connection of a radiant heater with a temperature sensor protective tube
Der Befestigung von Temperaturfühlern an Rohrheizkörpern wurden also bisher vornehmlich Aspekte der mechanischen Fixierung und der richtigen Temperaturmessung zugrunde gelegt. Für Backöfen, die neben thermischen Heizeinrichtungen auch Mikrowellenheizeinrichtungen besitzen, also einen integrierten Betrieb ermöglichen, sind mechanische und meßtechnische Gesichtspunkte für die Fixierung von Temperaturfühler am Rohrheizkörper nicht hinreichend für die Verbindungsstelle. Die Temperaturfühler sind bei Herden mit integrierter Mikrowelle in einem Fühlerschutzrohr untergebracht. Bei Mikrowellenbetrieb heizt sichdie Verbindungsstelle bei einer nur den mechanischen Anforderungen genügenden Positionierung stark auf. Dadurch wird dem Temperaturfühler eine nicht den Umgebungstemperaturen entsprechende Wärmemenge zugeführt. Bei integriertem Betrieb wird somit die Reglerkennlinie verfälscht.So far, the attachment of temperature sensors to tubular heaters has primarily been based on aspects of mechanical fixation and correct temperature measurement. For ovens which, in addition to thermal heating devices, also have microwave heating devices, that is to say enable integrated operation, mechanical and measurement-technical considerations for fixing temperature sensors on the tubular heating element are not sufficient for the connection point. For stoves with an integrated microwave, the temperature sensors are housed in a sensor protection tube. In microwave operation, the connection point heats up strongly when the positioning is only sufficient for the mechanical requirements. As a result, an amount of heat not corresponding to the ambient temperatures is supplied to the temperature sensor. With integrated operation, the controller characteristic is falsified.
Die Aufgabe der Erfindung besteht darin, daß der in einem Fühlerschutzrohr befindliche Temperaturfühler so mit dem Grillkörper verbunden ist, daß keine Temperaturverfälschung bei kombiniertem Heizbetrieb (Mikrowelle und thermische Heizung) auftritt.The object of the invention is that the temperature sensor located in a sensor protection tube is connected to the grill body in such a way that no temperature distortion occurs in combined heating operation (microwave and thermal heating).
Die erfindungsgemäße Anordnung ist dadurch gekennzeichnet, daß der Rohrheizkörper und ein Temperaturfühlerschutzrohr, die an der Muffelwandseite befestigt und durch einen Flansch miteinander verbunden sind, durch mindestens einen Träger mechanisch und mikrowellenspezifisch fixiert und im Bereich gleicher Mikrowellenpotentiale verbunden sind, wobei die Verbindungsstelle zwischen dem Fühlerschutzrohr und dem Rohrheizkörper der Bedingung (1/4 + n . 1/2)λ genügt, mit λ als Wellenlänge der verwendeten Hochfrequenz, wobei für n = 0,1,2 ... gilt.The arrangement according to the invention is characterized in that the tubular heater and a temperature sensor protection tube, which are attached to the muffle wall side and are connected to one another by a flange, are mechanically and microwave-specifically fixed by at least one support and are connected in the region of the same microwave potentials, the connection point between the sensor protection tube and the tubular heater satisfies the condition (1/4 + n . 1/2) λ, with λ as the wavelength of the high frequency used, where n = 0.1.2 ... applies.
Ein Ausführungsbeispiel der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben.An embodiment of the invention is described below with reference to the drawing.
Es zeigt
- Fig. 1
- eine Anordnung von einem Fühlerschutzrohr und einem Rohrheizkörper,
- Fig. 2
- eine graphische Darstellung Q = f (x).
- Fig. 1
- an arrangement of a sensor protection tube and a tubular heater,
- Fig. 2
- a graphical representation Q = f (x).
Gemäß Fig. 1 ist eine Muffelwand 1, die an der Backofenseite eine Emailschicht 2 besitzt, Befestigungsfläche für einen Flansch 3. Am Flansch 3 befestigt ist ein Fühlerschutzrohr 4 und ein Rohrheizkörper 5. Über mindestens einen Träger 6 werden das Fühlerschutzrohr 4 und der Rohrheizkörper 5 mechanisch und mikrowellenspezifisch fixiert. Durch den Flansch 3 des Grillkörpers sind das Fühlerschutzrohr 4 und der Rohrheizkörper 5 miteinander verbunden. Die elektrische Verbindung des Flansches mit der Muffel wird durch kapazitive Kopplung erreicht. Im Hochfrequenzfeld liegt der Flansch 3 damit auf einem definierten Potential. Die parallel in die Muffel hineinragenden Teile des Rohrheizkörpers 5 und des Fühlerschutzrohres 4 wirken wie eine am Ende kurzgeschlossene Leitung. An deren Ende tritt ein Strommaximum auf. Dies wiederholt sich im Abstand einer 1/2 Wellenlänge. Wird an dieser Stelle oder in deren naher Umgebung eine Verbindung zwischen den beiden Teilen über einen Trägerbügel hergestellt, so heizt sich die Verbindungsstelle und damit auch das Fühlerschutzrohr 4 durch den dann fließenden Kurzschlußstrom extrem auf. Liegt die Verbindungsstelle hingegen im Bereich des Strom-Null-Durchganges, also bei (1/4 + n · 1/2) λ mit n = 0,1,2 ... λ = Wellenlänge, so bleibt das Fühlerschutzrohr von der Mikrowellenenergie nahezu unbeeinflußt.According to FIG. 1, a muffle wall 1, which has an enamel layer 2 on the oven side, is a fastening surface for a flange 3. A sensor protection tube 4 and a tubular heating element 5 are attached to the flange 3 mechanically and microwave-specifically fixed. The sensor protection tube 4 and the tubular heating element 5 are connected to one another by the flange 3 of the grill body. The electrical connection of the flange to the muffle is achieved by capacitive coupling. In the high-frequency field, the flange 3 is therefore at a defined potential. The parts of the tubular heating element 5 and the sensor protection tube 4 projecting parallel into the muffle act like a line short-circuited at the end. At the end of this, a current maximum occurs. This is repeated at intervals of 1/2 wavelength. Will on this Place or in the immediate vicinity of a connection between the two parts made via a support bracket, the connection point and thus the sensor protection tube 4 heats up extremely by the then flowing short-circuit current. If, on the other hand, the connection point is in the area of the current zero crossing, i.e. at (1/4 + n · 1/2) λ with n = 0.1.2 ... λ = wavelength, the sensor protection tube remains almost free of the microwave energy unaffected.
Die gezielte, den mikrowellentechnischen Erfordernissen genügende Positionierung der Verbindung von Rohrheizkörper 5 und Fühlerschutzrohr 4 verhindert eine Aufheizung des Fühlerschutzrohres 4 durch die Mikrowellenenergie. Die Reglerkennlinie wird durch den Mikrowellenbetrieb daher nicht beeinflußt.The targeted positioning of the connection between tubular heating element 5 and sensor protection tube 4, which meets the requirements of microwave technology, prevents heating of the sensor protection tube 4 by the microwave energy. The controller characteristic is therefore not affected by microwave operation.
Fig. 2 zeigt eine qualitative graphische Darstellung Q = Funktion von x. Dabei ist Q die durch Mikrowellenenergie vom Träger 6 aufgenommene Wärmemenge, wenn man diesen Träger 6 in x-Richtung verschiebt. Der Wertevorrat für x liegt dabei zwischen 0 ... und 1, wobei 1 = Länge des Fühlerschutzrohres 4 bedeutet. Für die x = (1/4 + n · 1/2) λ ergibt sich ein Wärmeenergieminimum, da hier Null-Durchgänge für den induzierten Querstrom liegen. Die polartigen Maxima liegen bei x = n · λ 1/2. Dabei gilt: n = 0,1,2 ...; λ = Wellenlänge der verwendeten Hochfrequenz.2 shows a qualitative graphical representation Q = function of x. Q is the amount of heat absorbed by the carrier 6 by microwave energy when this carrier 6 is moved in the x direction. The range of values for x lies between 0 ... and 1, where 1 = length of the sensor protection tube 4. For the x = (1/4 + n · 1/2) λ there is a thermal energy minimum, since there are zero crossings for the induced cross current. The pole-like maxima are at x = n · λ 1/2. The following applies: n = 0.1.2 ...; λ = wavelength of the radio frequency used.
Claims (2)
- Domestic microwave appliance with thermal heating equipment with a tubular heater element and microwave heating equipment, wherein a temperature sensor is arranged as target value generator for the control of the thermal heating equipment, characterised thereby, that the tubular heater element (5) and a temperature sensor protection tube (4), which are fastened at the muffle wall side and connected together by a flange (3), are fixed mechanically and specifically for microwaves by at least one carrier (6) and connected in the region of equal microwave potentials, wherein the point of connection between the temperature sensor protection tube (4) and the tubular heater element (5) meets the condition (1/4 + n.1/2) λ, with λ as wavelength of the high frequency used, wherein n = 0, 1, 2, ... applies.
- Domestic microwave appliance according to claim 1, characterised thereby, that the point of connection is preferably arranged at n = 0, i.e. 5/4 λ .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3942687 | 1989-12-22 | ||
| DE3942687A DE3942687A1 (en) | 1989-12-22 | 1989-12-22 | MICROWAVE HOUSEHOLD APPLIANCE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0433968A2 EP0433968A2 (en) | 1991-06-26 |
| EP0433968A3 EP0433968A3 (en) | 1991-09-25 |
| EP0433968B1 true EP0433968B1 (en) | 1994-02-23 |
Family
ID=6396264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90124564A Expired - Lifetime EP0433968B1 (en) | 1989-12-22 | 1990-12-18 | Microwave household appliance |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0433968B1 (en) |
| DE (2) | DE3942687A1 (en) |
| ES (1) | ES2049395T3 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3035747C2 (en) * | 1980-09-22 | 1982-10-21 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Microwave oven |
| DE8812765U1 (en) * | 1988-10-11 | 1988-11-24 | Bosch-Siemens Hausgeräte GmbH, 8000 München | oven |
-
1989
- 1989-12-22 DE DE3942687A patent/DE3942687A1/en active Granted
-
1990
- 1990-12-18 ES ES90124564T patent/ES2049395T3/en not_active Expired - Lifetime
- 1990-12-18 EP EP90124564A patent/EP0433968B1/en not_active Expired - Lifetime
- 1990-12-18 DE DE90124564T patent/DE59004685D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0433968A2 (en) | 1991-06-26 |
| EP0433968A3 (en) | 1991-09-25 |
| DE3942687C2 (en) | 1992-11-12 |
| ES2049395T3 (en) | 1994-04-16 |
| DE3942687A1 (en) | 1991-06-27 |
| DE59004685D1 (en) | 1994-03-31 |
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