JPH0737680A - Electric cooking device and manufacture of heater element for electric cooking device - Google Patents

Abstract

PURPOSE:To provide an electric cooking device keeping the temperature distribution of a cooking plate uniform and having a quick temperature rise, excellent thermal responsiveness, good operability, and excellent cleaning property. CONSTITUTION:A surface-treated layer 1-2 made of heat-conductive ceramic or the like is formed on the upper face of a cooking plate laid with its back face upward, a metal foil heating element 3 is arranged between the surface- treated layer 1-2 and a sheet-like insulating material 2 mixed with a heat- resistant adhesive in mica into a prepreg shape, and it is heated, pressurized, and molded. The cooking plate 1 and the metal foil heater element 3 are integrated to form a heater element 4. A glass ceramic plate 5 is provided on the lower face of the heater element 4, and the metal foil heater element 3 is sandwiched and fixed by the cooking plate 1 and the glass ceramic plate 5.

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 or the like on a cooking plate made of glass ceramics, and a method for manufacturing a heating element for the electric cooker.

[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 20 mm. Therefore, the temperature rise is bad, there is a problem in thermal response, and the handling is poor. In addition, when various kinds of cooking are performed, a smell remains and a problem remains 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 air, 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 also an electric cooker (Japanese Patent Application Laid-Open No. 3-210218) for performing grill cooking.

[0005]

In the case where the halogen lamp is provided under the ceramics cooking plate, heat and light from the halogen lamp are easily transmitted to cause uneven temperature when cooking directly on the surface of the cooking plate. Temperature control is difficult, there is a problem in cooking deliciously, and there is also a problem that transmitted light flickers and is troublesome. Further, a far infrared radiator is placed on the cooking plate and a grill is placed on the top of the cooking plate to perform grill cooking, but there is a problem in that the temperature rise is poor and delicious cooking is performed.

According to the present invention, the cooking plate made of a glass-ceramic plate has a uniform temperature distribution, has a rapid temperature rise, and has an excellent thermal response. It is intended to provide a cooking device.

[0007]

The present invention has been made to solve the above problems, and detects the temperature of a cooking plate made of glass ceramics to control the energization of a heating element to optimize the surface temperature of the cooking plate. In an electric cooker for directly cooking an object to be cooked on a cooking plate having a temperature control means for achieving a different cooking temperature, a surface treatment layer made of ceramics or the like having good heat conduction is provided on the upper surface of the cooking plate with the back surface facing upward. On the surface treatment layer, a heat-resistant adhesive is mixed with mica or the like on the surface-treated layer, and a metal foil heating element is sandwiched with a sheet-shaped insulating material in the form of a peripreg. This is a heating element produced by integrating a metal foil heating element.

Further, it is preferable that a glass ceramics plate is provided on the lower surface of the heating element in which the cooking plate and the metal foil heating element are joined and integrated, and the metal foil heating element is sandwiched and fixed by the cooking plate and the glass ceramics plate.

[0009]

The electric cooker of the present invention comprises the above-mentioned constituent elements, and has a surface treatment layer made of ceramics or the like formed on the back surface of the cooking plate, and a metal foil heating element arranged on the back surface of the surface treatment layer. A sheet-shaped insulating material made by mixing heat-resistant adhesive with mica to form a peri-preg, electrically insulates the metal foil heating element, makes the cooking plate surface uniform, and heats it quickly. By heat-press molding, a heating element in which the cooking plate and the metal foil heating element are integrated can be easily manufactured. The glass-ceramic plate prevents heat from the heating element from being transferred downward and improves thermal efficiency.

[0010]

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 schematic cross-sectional view of an electric cooker according to the present invention, and FIG. 2 is a main-part cross-sectional view for explaining a method of manufacturing a heating element used in the electric cooker.

In the figure, reference numeral 1 is a cooking plate made of glass ceramics, and its heat resistant temperature is 600.
℃ is high, the coefficient of thermal expansion (α) is as low as −2 × 10 ⁷ / ° C, and it can withstand rapid heating and quenching, and the thermal conductivity (λ) is 1.3 kcal / m.
hr. It is as small as ℃ and its heat conduction is low. The back surface of the cooking plate 1 is on the upper side, and the surface treatment layer 1-2 is provided on the upper surface of the cooking plate 1 so as to improve adhesion and heat conduction.
To form. The surface treatment layer 1-2 is an inorganic adhesive layer obtained by mixing ceramic powder with an inorganic adhesive material such as aluminum phosphate, a sprayed layer formed by spraying ceramics such as alumina, or a ceramic powder using a polysiloxane inorganic polymer as a binder. It is formed of a heat-resistant organic adhesive material layer mixed with.

As the above ceramic powder, the thermal conductivity of glass ceramics (λ = 1.3 kcal / m · h)
r. C. 2) or more, which has good thermal conductivity, and is mixed with a material having excellent thermal conductivity such as alumina, alumina-silica, sialon, or aluminum nitride (thermal conductivity λ = 150 kcal / mhr ° C.). Then, the surface treatment layer 1-2 having good thermal conductivity is formed.

Reference numeral 2 is a mica or the like mixed with a heat-resistant organic adhesive such as polysiloxane to form a peripreg, and has a thickness of 0.4.
It is a sheet-shaped insulating material of about mm. The metal foil heating element 3 is sandwiched by the sheet-shaped insulating material 2 and placed on the surface treatment layer 1-2 on the cooking plate 1 and heated for about 2 hours at a curing temperature of about 200 ° C. of a heat-resistant adhesive material such as a polysiloxane adhesive material. , The elastic body such as rubber is pressure-molded and uniformly molded on the cooking plate 1 to form the heating element 4.

The metal foil heating element 3 is made of ferritic stainless steel foil (15Cr-4.5Al) or nickel chrome foil (80Ni-20Cr) and has a high specific resistance.
It is also a material with excellent heat resistance. The processing method is a method such as etching or punching press that can obtain a predetermined shape and resistance value.

In the cooking plate 1 in which the heating element 4 is integrally formed, the orientation of the cooking plate 1 is changed so as to prevent the metal foil heating element 3 from being deformed by heat and not abnormally heated due to peeling or the like. The metal foil heating element 3 side is faced down, and the glass ceramics plate 5 is provided on the lower surface of the metal foil heating element 3 side to sandwich and fix it. Next, a heat insulating layer 6 is provided on the lower surface of the glass ceramic plate 5 to prevent heat from being conducted downward, thereby improving efficiency.

On the back surface of the cooking plate 1, a sensor 7 having a thermistor attached to a ceramic plate of good heat conductivity such as aluminum nitride is formed, and a spring or the like is provided so that the temperature of the cooking plate 1 can always be detected accurately. A control unit 8 is provided, which is used in pressure contact with the back surface of the cooking plate 1 and which controls the temperature by a signal from the sensor 7 so as to always maintain the optimum cooking temperature. Reference numeral 9 is a machine body that constitutes the electric cooker by assembling the above components.

Next, the operation of this embodiment will be described.

In this cooking device, when grilling, for example, hamburger is performed, the control unit 8 controls the signal from the sensor 7 so as to maintain the optimum cooking temperature, and the cooking plate 1 is heated by the metal foil heating element 3 to about 240 ° C. When the food to be cooked such as a hamburger is placed on the cooking plate 1 after being heated to, the temperature of the cooking plate 1 temporarily drops, but the metal foil heating element sandwiched by the sheet-shaped insulating material 2 under the cooking plate 1. Since 3 is joined and integrated to form the heating element 4, the thermal responsiveness is good and the heat is quickly transmitted to the cooking plate 1, the temperature distribution is good and the temperature is uniform, and the heat is evenly transmitted to the hamburger. The hamburger can be finished in a short time of about 3 minutes without uneven temperature.

Since the glass ceramic plate 5 is sandwiched and fixed to the lower surface of the heating element 4 to which the metal foil heating element 3 is joined and integrated, the metal foil heating element 3 is thermally deformed and abnormally heated by peeling or the like. The durability is greatly improved. Further, a sensor 7 is attached to the back surface of the cooking plate 1 and the control section 8 controls the cooking plate 1 by the signal from the sensor 7.
The surface temperature is controlled so as to maintain the optimum cooking temperature within the temperature range of 40 ° C to the maximum temperature of 300 ° C.

Further, since the heat insulating layer 6 is provided on the lower surface of the glass ceramic plate 5, heat is not conducted downward, and the efficiency is improved. In addition, the surface of the cooking plate 1 is flat and has excellent cleanability, and if the oil film is baked with salad oil or the like before use, the cleanability tends to be further improved.

Further, in the manufacturing method, the surface treatment layer 1-2 is formed on the cooking plate 1 placed in reverse, and the metal foil heating element 3 sandwiched by the sheet-shaped insulating material 2 is placed thereon, Since the heating element 4 is formed by heating and pressurizing to be uniformly integrated, workability is good and a heating element of high quality can be obtained.

[0022]

As described above, according to the present invention, since the metal foil heating element sandwiched by the sheet-shaped insulating material is joined and integrated under the cooking plate to form the heating element, the thermal response is good, The temperature distribution is good, the object to be heated can be finished in a short time without temperature unevenness, and the glass ceramic plate is sandwiched and fixed to the lower surface of the heating element that is integrated with the cooking plate. Durability is greatly improved without abnormal heating due to heat deformation and peeling, and the cooking plate surface can be quickly and efficiently heated with a uniform temperature distribution for direct and delicious cooking, and easy cleaning. An electric cooker having excellent and improved durability can be provided.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of essential parts for explaining a method for manufacturing a heating element used in the electric cooker.

[Explanation of Codes] 1 Cooking plate 1-2 Surface treatment layer 2 Sheet-shaped insulating material 3 Metal foil heating element 4 Heating element 5 Glass ceramic plate

Claims (3)

[Claims] 1. The cooking object is cooked directly on the cooking plate by detecting the temperature of the cooking plate and controlling the energization of the heating element to bring the surface temperature of the cooking plate to the optimum cooking temperature. In the electric cooker, the cooking plate (1) is made of glass ceramics, and a surface treatment layer (1-2) made of ceramics or the like having good heat conductivity is provided on the back surface of the cooking plate (1). The metallic foil heating element (3) is sandwiched between the sheet-shaped insulating material (2) formed by mixing a heat-resistant adhesive with mica or the like on the back surface of 1-2), and the cooking plate (1) and metallic foil heat generation are provided. An electric cooker comprising a heating element (4) in which the body (3) is integrated. 2. The heating element (4) in which the cooking plate (1) and the metal foil heating element (3) are joined and integrated.
The electric cooker according to claim 1, wherein a glass ceramic plate (5) is provided on the lower surface of the plate, and the metal foil heating element (3) is sandwiched and fixed by the cooking plate (1) and the glass ceramic plate (5). 3. A surface treatment layer (1-2) made of ceramics or the like having good thermal conductivity is formed on the upper surface of a cooking plate (1) with its back surface facing upward, and the surface treatment layer (1-
The metal foil heating element (3) is sandwiched between the sheet-shaped insulating material (2) formed by mixing a heat-resistant adhesive material with mica or the like on top of 2) and heat-pressed to form a cooking plate ( A method for producing a heating element for an electric cooker, which comprises producing a heating element (4) in which 1) and a metal foil heating element (3) are integrated.