JP2008279083A - Electromagnetic induction cooker using ceramic pot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic induction cooker allowed to be coated with a practical fluororesin coating thereon in the electromagnetic induction cooker such as a rice cooking earthen pot. <P>SOLUTION: The pot for the electromagnetic induction cooker coated with the practical fluororesin coating consists of an alumina film formed on the inner surface of the ceramic pot and containing metal and an metal oxide relative to those of the ceramic pot, and a fluororesin film formed on the upper face of the alumina film, wherein the alumina film is formed by previously roughening the surface of the ceramic pot by sand blast and then subjected to, for example, metallikon spraying or plasma spraying so as to prevent easy peeling of the fluororesin film. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electromagnetic induction heating cooker, and more particularly to an electromagnetic induction heating cooker using a ceramic pan.

  Today, ceramic pots for cooking are representative of clay pots, but in recent years, with the spread of electromagnetic induction heaters, clay pots are required to be coated with non-viscous fluororesin.

In Patent Document 1, a non-adhesive layer mainly composed of a fluororesin is provided on the inner surface of a cooking container, and a soaking layer made of a nonmagnetic metal material having a predetermined thickness and having a predetermined thickness is provided on the rear surface of the cooking container. It is an invention of a heating cooker.
JP 11-99064 A

  However, unlike general cooking, electromagnetic induction heating has a rapid temperature rise in the magnetic part and the like, and peeling due to repeated overheating occurs due to poor heat dispersion in the earthenware pot. For this reason, substantial realization of a fluororesin film has not been made as an electromagnetic induction heating cooker.

  Moreover, the cooking pot for general use performs a sandblasting process on the earthen pot and roughens it, for example, applies an undercoating paint containing polyethylene rufone, fluorinated ethylene propylene or the like, and applies a fluororesin thereon. However, it cannot be used as a cooker for electromagnetic induction heating, and peels off from the undercoat surface, and a practical fluororesin coating film including a rice cooking pot has not been obtained.

  Then, an object of this invention is to implement | achieve the electromagnetic induction heating cooking appliance which enables practical fluororesin coating to electromagnetic induction heating cooking appliances, such as a clay pot for rice cooking.

  According to the present invention, there is provided an electromagnetic wave comprising an alumina film formed on the surface of a ceramic pan, containing an amount of metal and metal oxide more than the ceramic pan, and a fluororesin film formed on the surface of the alumina film. This can be achieved by providing an induction cooker.

  The alumina film is formed after the ceramic pan is roughened by sandblasting, for example.

Moreover, the said fluororesin film | membrane is comprised by the lower layer of the fluororesin formed, for example on the surface of the said ceramic film | membrane, and the upper layer of the fluororesin formed on this lower layer.
Moreover, the roughening of roughness 2-10 microns is the structure formed in the surface of the said ceramic pan, for example.

  The lower layer of the fluororesin is 5 to 15 microns, and the upper layer of the fluororesin is 30 to 60 microns.

  Furthermore, a film made of alumina or the like containing more metal and metal oxide than the ceramic pot is formed between the surface of the ceramic pot and the fluorine resin film.

  According to the present invention, after the surface of the ceramic pan is previously roughened by sandblasting, an alumina film is formed using, for example, metallicon spraying or plasma spraying, the heat dispersion effect of the alumina film, and adhesion to the fluororesin film Due to the effect, a pan for the electromagnetic induction heating cooker can be provided in which a fluororesin film is subsequently formed, the peeling of the fluororesin film is eliminated, and a practical fluororesin coating is applied.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a configuration of an electromagnetic induction heating cooker used in the present embodiment. In addition, this example demonstrates using the example of an electromagnetic induction heating rice cooker as an electromagnetic induction heating cooker.

  The electromagnetic induction heating rice cooker 1 includes a main body 2 and a lid portion 3, and a ceramic pan 4 is provided in the main body 2. A heating coil 5 for electromagnetic induction heating is disposed on the lower surface of the ceramic pan 4. The heating coil 5 is swirled in a spiral shape and connected in series to a high-frequency power source, and is configured to supply a high-frequency current to the heating coil 5. The heating coil 5 is driven and controlled by a control unit (not shown) to adjust the heating of the ceramic pan 4. I do.

  FIG. 2 is a view for explaining the structure of the ceramic pan 4. The ceramic pan 4 is a ceramic pan 8 made of alumina or the like formed on the inner surface (surface) of the clay pan 7 with the electromagnetic induction heating pan (hereinafter simply referred to as a clay pan) 7 as a base. 9, and an upper layer 10 of the fluororesin is formed on the lower layer 9 of the fluororesin.

  Further, FIG. 3 is a diagram showing a cross-sectional configuration of the ceramic pan 4. When the ceramic film 8 such as alumina is formed, the surface 7a of the clay pan 7 is roughened by sandblasting, and then, for example, alumina having an aluminum content of 95% or more. It is generated by metal spraying (Thermal Spray) or plasma spraying. Specifically, the ceramic film 8 is generated by spraying alumina (ceramic) melted by a heat source such as plasma onto the clay pot 7 whose surface 7a is roughened as described above.

  The fluororesin lower layer 9 and the fluororesin upper layer 10 formed on the upper surface of the ceramic film 8 are undercoated with a fluororesin coating on the ceramic film 8 and then baked at 400 ° C. for about 20 minutes, for example. Is generated. The electromagnetic induction heating rice cooker 1 manufactured in this way has a sufficient life as a cooker having functions of adhesion and heat dispersion. In addition, as a fluororesin, tetrafluoroethylene resin etc. are used, for example.

By comprising in this way, the adhesiveness of the fluororesin with respect to the ceramic pan 4 can be improved. In addition, by diffusing heat quickly, suppressing the partial temperature rise between the fluororesin and the earthenware pot material, and suppressing the generation and impregnation of vapor at the ceramic interface, practical fluororesin processing with a long life is applied. The electromagnetic induction heating rice cooker 1 made can be provided.
In the description of the above embodiment, the electromagnetic induction heating cooker of the present invention has been described as the electromagnetic induction heating rice cooker 1, but is not limited to the electromagnetic induction heating rice cooker 1 and is applicable to all cookers adopting the electromagnetic induction heating method. It can be done.

Further, in the description of the above embodiment, for example, alumina is used as the ceramic. However, titania, chromium oxide, or the like may be used as another ceramic material.
Furthermore, the formation of the fluorine film on the alumina may be one layer.

It is sectional drawing which shows the structure of the electromagnetic induction heating cooking appliance used by this embodiment. It is a figure explaining the structure of a ceramic pan. It is a figure which shows the cross-sectional structure of a ceramic pan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic induction heating rice cooker 2 ... Main body 3 ... Cover part 4 ... Ceramic pan 5 ... Heating coil 7 ... Earth pan 8 for electromagnetic induction heating ... Ceramic film 9 ...・ Lower layer of fluororesin 10 ・ ・ Lower layer of fluororesin

Claims (7)

An alumina film formed on the surface of the ceramic pan and containing more metal and metal oxide than the ceramic pan;
A fluororesin film formed on the upper surface of the alumina film;
An electromagnetic induction heating cooker comprising: The electromagnetic induction heating cooker according to claim 1, wherein the alumina film is formed after the ceramic pan is roughened by sandblasting. 3. The electromagnetic wave according to claim 1, wherein the fluororesin film is composed of a lower layer of a fluororesin formed on the surface of the ceramic film and an upper layer of the fluororesin formed on the lower layer. Induction heating cooker. The electromagnetic induction heating cooker according to claim 2, wherein a roughening having a roughness of 2 to 10 microns is formed on a surface of the ceramic pan. The electromagnetic induction heating cooker according to claim 3, wherein the lower layer of the fluororesin is formed thinner than the upper layer of the fluororesin. A method for coating a ceramic pan with a fluororesin, comprising forming a film of alumina or the like containing more metal and metal oxide than the ceramic pan between the surface of the ceramic pan and a fluororesin film. The electromagnetic induction heating cooker according to claim 2, wherein, when a single layer of the fluororesin film is coated on the alumina film, the fluororesin film is thicker than the roughening of the ceramic.

Images