JPH0727347A - Electric cooking device - Google Patents

Abstract

PURPOSE:To provide an electric cooking device in which the upper surface of a cooking plate consisting of glass ceramics is uniformly heated to effect the various grill cookings of hamburger, etc., producing a good taste and which is excellent in cleanability and productivity. CONSTITUTION:A uniformly heating layer 2 consisting of the ceramics good in heat conduction as a uniformly heating means is provided on the rear face of a cooking plate 1 consisting of glass ceramics, a metal foil heat generating body 3 for heating the cooking plate 1 is provided on the rear face of the uniformly heating layer 2, a fixing plate 4 consisting of a glass ceramic plate and having mounted thereon a thermal insulation sheet 10 excellent in heat resistance is provided on the rear face of the metal foil heat generating body 3 and a reflecting plate 5 is provided in close contact with the rear face of the fixing plate 4. A sensor 6 having a thermistor attached to the ceramic plate good in heat conduction is attached and fixed to the rear face of the cooking plate 1 as a temp. detecting means for detecting the temp. of the cooking plate 1 and a control part 7 is provided which controls the surface temp. of the cooking plate 1 based on a signal detected by the sensor 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cooker for directly performing grill cooking on a cooking plate made of glass ceramics.

[0002]

2. Description of the Related Art Conventionally, iron cooking plates have been widely used in electric cookers used for grilling grilled meat, hamburgers and the like. In order to properly cook the iron-based cooking plate, it is necessary to use a thick iron plate having a thickness of about 10 mm. Therefore, the temperature rise is poor, there is a problem in the thermal responsiveness, etc., and it is heavy and not easy to handle. In addition, when various kinds of cooking are carried out, the smell remains and there is a problem in cleanability.

In order to improve the cleaning performance and shorten the response time, a halogen lamp is provided under a cooking plate made of ceramics, a heat insulating material layer is provided under the halogen lamp, and the temperature response is responsive to the temperature of the cooking plate. Electric cooker provided with means (Japanese Patent Publication No. 10716/1992)
There is.

Further, in order to be able to cook with charcoal-grilled wind, to increase the capacity and shorten the cooking time, and to improve the cleanability, a far-infrared radiator is installed on the cooking plate, and a grill is placed above this. There is an electric cooker (Japanese Patent Application Laid-Open No. 3-210218) for grilling by grilling, and a metal foil heating element is sandwiched by a glass ceramic plate and a glass ceramic plate is adhered by a crystallized glass adhesive to heat the metal foil. There is a heating element with a fixed body (JP-A-2-220386).

[0005]

When a halogen lamp is provided under a ceramics cooking plate, heat and light from the halogen lamp easily pass through to cook directly on the surface of the cooking plate, which causes temperature unevenness. It is difficult to control, there is a problem in cooking deliciously, and there is a problem that the transmitted light flickers and it is annoying. Also, a far-infrared radiator installed on a cooking plate and a grill placed on top of it for grill cooking has a problem in that the temperature rise is poor and delicious cooking is performed. In addition, the number of heating elements sandwiching the metal foil heating element with the glass ceramic plate is 8
The workability was poor because it was necessary to fire at a high temperature of 00 ° C or higher.

In the present invention, the problems of the prior art are solved so that the temperature distribution of the cooking plate made of a glass ceramic plate is kept uniform, the temperature rises quickly, the thermal response is excellent, and the workability is improved. The present invention aims to provide an electric cooker which is easy to use and excellent in cleanability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the cooking plate is made of glass ceramics, and a heat detector such as aluminum nitride is used as a temperature detecting means for detecting the temperature of the cooking plate. A sensor with a thermistor attached to a ceramic plate with good conductivity is glued and fixed to the back of the cooking plate,
Equipped with a heating means for heating the cooking plate and a control unit for controlling the energization of the heating means based on the signal detected by the sensor to control the surface temperature of the cooking plate to the optimum cooking temperature, and the heating means heats the cooking plate. In the electric cooker that cooks the food directly on it,
On the back side of the cooking plate, a soaking layer made of ceramics such as aluminum nitride having high thermal conductivity and high electrical insulation resistance is provided as a soaking means, and a metal foil heating element is provided as a heating means on the back side of the soaking layer. A heat shield sheet made of ceramic fibers such as alumina-silica having excellent heat resistance is provided on the back surface of the foil heating element, and a fixing plate made of a glass ceramic plate is provided on the back surface of the heat shield sheet. A reflector is provided in close contact with the back surface of the plate.

[0008]

The electric cooker according to the present invention comprises the above-mentioned components, and the soaking layer and the metal foil heating element provided on the back surface of the glass ceramic cooking plate electrically insulates the metal foil heating element and the metal foil heating element. The heat radiated by the heat is evenly conducted to the cooking plate, the surface of the cooking plate is quickly and evenly heated, and the heat shield sheet, the fixing plate and the reflecting plate provided on the back surface of the heat equalizing layer are the heat from the metal foil heating element. Is prevented from being transmitted in the downward direction, and by sandwiching and fixing the metal foil heating element between the cooking plate and the fixing plate, deformation is prevented, abnormal heating is reduced, heat conduction to the back surface is reduced, and thermal efficiency is improved. . Moreover, the sensor and the control unit control the energization of the heating means based on the signal detected by the sensor to control the surface temperature of the cooking plate to the optimum cooking temperature and cook deliciously.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an essential part of an electric cooker according to an embodiment of the present invention, and FIG. 2 is a sectional view of an essential part of an electric cooker according to another embodiment.

In the figure, reference numeral 1 is a cooking plate made of glass ceramics, the heat resistance temperature of which is 600.
° C. and higher, the thermal expansion coefficient (alpha) withstands rapid thermal quenching low as -2 × 10 ~ ⁷ / ℃, thermal conductivity 1.3 kcal / m. hr.
It is as small as ℃ and its heat conduction is low.

A soaking layer 2 is provided on the back surface of the cooking plate 1 as a soaking means for making the surface temperature of the cooking plate 1 more uniform and preventing uneven temperature. The heat-uniforming layer 2 is made of a material having a thermal conductivity of 10 times or more of the thermal conductivity of glass ceramics (1.3 kcal / m.hr. ° C.) and a high electrical insulation resistance.
For example, aluminum nitride (heat conductivity 150 kcal / mhr
C.) or ceramic powder such as sialon and an inorganic polymer or an inorganic adhesive material such as aluminum phosphate are mixed to form a heat equalizing layer 2 on the back surface of the cooking plate 1.

Reference numeral 3 denotes a metal foil heating element provided as a heating means on the back surface of the soaking layer 2. The metal foil heating element 3 is a ferritic stainless steel foil (15Cr-4.5Al) or nickel chrome foil (80Ni-). 20Cr) etc.,
It is a material with high specific resistance and excellent heat resistance. The processing method is a method such as etching or punching press that can obtain a predetermined shape and resistance value. Reference numeral 4 denotes a fixing plate made of a glass ceramic plate, and the metal foil heating element 3 is sandwiched and fixed between the fixing plate 4 and the cooking plate 1. A reflecting plate 5 made of aluminum foil is provided on the lower surface of the fixing plate 4, and heat is reflected so that heat does not go downward so that the surface temperature of the cooking plate 1 becomes uniform.

On the back surface of the cooking plate 1, a sensor 6 having a thermistor attached to a ceramic plate of good heat conduction such as aluminum nitride is attached to the back surface of the cooking plate 1 so as to always detect temperature accurately. A control unit 7 is provided that is fixed and controls the temperature so as to maintain an optimum cooking temperature within a temperature range of 40 ° C. to a maximum temperature of 300 ° C. by a signal from the sensor 6. Reference numeral 8 denotes a machine body that constitutes the electric cooker by assembling the above components.

In FIG. 1, reference numeral 9 denotes a spring-shaped fixing base, which holds the fixing plate 4 from below and fixes it.

Further, in FIG. 2, 10 is a heat shield sheet provided on the back surface of the metal foil heating element 3 which is a heating means. The heat shield sheet 10 has a heat resistance of about 0.3 to 1.0 mm in thickness. It is made of excellent ceramic fiber such as alumina-silica and is effective in fixing the metal foil heating element 3 and insulating heat downward.

Next, the operation of the embodiment having the above configuration will be described.

In this cooker, when grilling, for example, hamburger is cooked, the control unit 7 controls the signal from the sensor 6 so as to maintain the optimum cooking temperature, and the cooking plate 1 is heated by the metal foil heating element 3 to 240 ° C. Heat it back and forth,
When a cooked item such as a hamburger is placed on the cooking plate 1, the cooking plate 1 temporarily lowers in temperature,
The heat from the metal foil heating element 3 has good thermal responsiveness through the soaking layer 2 and is quickly transferred to the cooking plate 1,
The temperature distribution is good and the hamburger is uniformly transmitted to the hamburger. Further, the heat reflection by the reflection plate 5 and the heat shield by the heat shield sheet 10 provide good thermal efficiency, and the hamburger can be finished in about 3 minutes without temperature unevenness.

Further, the surface of the cooking plate 1 is flat and excellent in cleaning property, and if the oil film is baked with salad oil before use, the cleaning property tends to be further improved.

Further, in the manufacturing method, the heat equalizing layer 2 is formed by coating the back surface of the cooking plate 1 with a material obtained by mixing a ceramic powder such as aluminum nitride powder having a good thermal conductivity with an inorganic adhesive that solidifies at a low temperature such as aluminum phosphate. Since the metal foil heating element 3 is formed, sandwiched by the fixing plate 4 made of a glass ceramic plate, and baked and fixed at 250 ° C., there is an advantage that the working temperature is low and the productivity is good.

[0020]

As described above, according to the present invention, a soaking layer made of aluminum nitride or the like and a metal foil heating element are provided on the back surface of a cooking plate made of a glass ceramic plate, and a heat shield sheet and a glass ceramic plate are provided on the lower surface thereof. Since a fixed plate consisting of the cooking plate is provided, and a sensor is attached to the back surface of the cooking plate to have a temperature control section, it is possible to directly cook on the flat surface of the glass ceramic cooking plate, which is excellent in cleanability. Moreover, the heat of the metal foil heating element is quickly and evenly transferred to the cooking plate by the heat equalizing layer, so that the temperature rise and temperature distribution are good, and the heat radiation to the lower part of the metal foil heating element is reduced, so that the heat efficiency is improved. Can be improved and delicious cooking can be done. Further, since the metal foil heating element is sandwiched and fixed by the cooking plate and the fixing plate, abnormal heating is reduced due to the deformation preventing effect, and durability is significantly improved.

Further, in the manufacturing method, on the back surface of the cooking plate, a material in which a ceramic powder having good heat conductivity is mixed with an inorganic adhesive which solidifies at low temperature is applied to form a soaking layer, and the metal foil heating element is fixed by a fixing plate. Since it is sandwiched and baked at 250 ° C. and fixed, there is an advantage that the working temperature is low and the productivity is good.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electric cooker to which an embodiment of the present invention is applied.

FIG. 2 is a sectional view of an essential part of an electric cooker to which another embodiment of the invention is applied.

[Explanation of symbols]

 1 Cooking Plate 2 Uniform Layer 3 Metal Foil Heating Element 4 Fixing Plate 5 Reflector 6 Sensor 7 Control Section 10 Heat Shield Sheet

Claims (4)

[Claims] 1. The cooking plate (1) is made of glass ceramics, heating means for heating the cooking plate (1), temperature detection means for detecting the temperature of the cooking plate (1), and this temperature detection means detect the temperature. The cooking plate (1) is heated by the heating means, and the heating means controls the energization of the heating means based on the signal to control the surface temperature of the cooking plate (1) to the optimum cooking temperature. In an electric cooker for directly cooking an object to be cooked, a metal foil heating element (3) is formed on the back surface of the cooking plate (1) as a heating means, and the metal foil heating element (3) is formed between the cooking plate (1) and the cooking plate (1). 3) A fixing plate (4) made of a glass-ceramic plate sandwiching the fixing plate (4) is provided, and a reflecting plate (5) is provided in close contact with the back surface of the fixing plate (4)
An electric cooker characterized in that the surface temperature of the cooking plate (1) is made uniform. 2. A soaking layer (2) made of ceramics such as aluminum nitride having good heat conduction and high electric insulation resistance is provided as a soaking means between the cooking plate (1) and the metal foil heating element (3). The electric cooker according to claim 1, wherein the electric cooker is provided so that heat radiated from the metal foil heating element (3) is uniformly conducted to the cooking plate (1). 3. The metal foil heating element (3) and a fixing plate (4).
A heat-shielding sheet made of ceramic fiber such as alumina-silica having excellent heat resistance as a heat-shielding means (1)
The electric cooker according to claim 1 or 2, wherein the heat conduction to the back surface of the metal foil heating element (3) is reduced by providing (0). 4. A sensor (6) having a thermistor attached to a ceramic plate having good heat conductivity such as aluminum nitride as a temperature detecting means for detecting the temperature of the cooking plate (1) is bonded to the back surface of the cooking plate (1). The electric cooker according to claim 1, 2 or 3, which is fixed by fixing.