JPH10229941A - Pot for electromagnetic cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to manufacture at a low cost and earthen or stone pot in using for electromagnetic cooking, to prevent any damage caused due to a difference in a thermal expansion coefficient and to enhance a heating efficiency. SOLUTION: A hole is opened on the bottom surface of the trunk of a ceramic- or stone-made pot, into which a carbon-made 2 bottom board member is bonded by an adhesive 4 and unified into one unit. This hole opened on the bottom surface of the pot is made to form the different levels of a larger diameter at the top and a smaller diameter at the bottom or a reverse truncated cone. The carbon-made 2 bottom board member forming a difference in levels or a reverse truncated cone so as to be fitted well into this hole is bonded by an adhesive 4 and unified into one unit with the pot bottom. Ceramics are deposit-coated over the top surface of the carbon-made 2 bottom board member. A fixing agent is soaked both into this deposit-coated layer and the carbon to fix them together to have a hardened surface 3 whose hardness is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot for an electromagnetic cooker in which a carbon plate is attached to an earthen pot, a stone pot, a glass pot, a synthetic resin container, etc. so that a non-metal container can be heated by the electromagnetic cooker. It is used in the food service industry and ordinary households.

[0002]

2. Description of the Related Art According to Japanese Patent Application Laid-Open No. 7-303569, there is provided a tableware for an electromagnetic cooker in which a carbon plate is fixed to an inner or outer surface of a tableware made of pottery, stone, synthetic resin, or the like. It is shown. In this case, since a flat carbon plate needs to be fixed to the inside or outside of the tableware, the inside or outside of the bottom surface of the tableware needs to be provided flat and as wide as possible. For this reason, the body and bottom of the earthenware pot were angular like a tub, and it was necessary to make the body as if it were steep from the bottom. This has the drawback that it takes time and effort to manufacture the earthen pot, easily generates defective products due to distortion and the like, and increases the cost.

According to Japanese Patent Application Laid-Open No. 61-116096, a circular hole is made in the bottom of an earthen pot to form a step, and a metal magnetic material that fits into the hole and the step is elastically bonded with an adhesive. Fixed earthen pots for electromagnetic cookers have been proposed. In this case, since the heating element uses a magnetic material made of metal that has a much higher coefficient of thermal expansion than the pottery pottery, the metal expands due to the heat generation and applies a force that expands around the pot from the inside. Will be. For this reason, there was a drawback that the durability of the clay pot was problematic.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive clay pot or stone pot using carbon as a heating element.

[0005]

SUMMARY OF THE INVENTION The inventor of the present invention has disclosed that an earthen pot which is slightly floated and fixed inside a carbon earthen pot according to Japanese Patent Application Laid-Open No. 7-303569 has a temperature at the bottom of the earthen pot of 10%.
It was noted that the temperature did not exceed 0 ° C. I noticed that this was because the temperature of the carbon itself as the heating element was cooled by water in the earthen pot and did not reach a temperature much higher than 100 ° C.

Therefore, the plate of carbon is slightly floated inside the earthen pot to stop being fixed at the peripheral portion, and the pot bottom such as an earthen pot or a stone pot is cut off horizontally, or a hole is drilled at the bottom from the beginning. Then, the bottom made of a carbon plate was attached to the hole with an adhesive to fix and integrate. That is,
A pot bottom made of a ceramic earthenware pot or a stone pot was cut off, and a bottom made of a carbon plate was fixed to a body part of the earthen pot or a stone pot with an adhesive to be integrated. In this case, the hole may be drilled without removing the entire bottom portion of the earthen pot or the stone pot, leaving the peripheral portion, or of course, may be formed in such a shape from the beginning. Further, the hole is a stepped hole or a conical hole having a large upper part and a small one at the lower part, and a carbon bottom plate member having a stepped part or a conical part so as to be engaged with the hole is bonded. It may be fixed by an agent and integrated. Further, the problem was solved by spraying ceramics on the surface of the carbon and fixing the sprayed layer and the carbon with a fixing agent to increase the surface hardness of the carbon.

[0007]

In general, the coefficient of thermal expansion of iron is about ^{24.times.10.sup.-6} , and the coefficient of thermal expansion of carbon and ceramics is about 8.times.10.sup.- ⁶ . When a metal several times larger than the thermal expansion is fixed to the bottom of the ceramic having a small thermal expansion, a force due to the thermal expansion of the metal is applied to the ceramic. However, when carbon having a small thermal expansion is used, there is no concern about this, and the durability of the pottery can be increased.

Further, since carbon has good heat conductivity,
Even with a carbon plate having a thickness of 5 mm, the temperature difference between the front and back sides is about 10 ° C. or less when the temperature is about 100 ° C. Therefore,
If one side of the carbon is inside the pot and cooled with cooking ingredients or water, the back of the 5mm thick carbon plate is also 100 ° C
To the extent that the safety device of the electromagnetic cooker operates around 200 ° C, it will not be very much. Therefore, the bottom of the earthen pot is made of carbon, and even if this carbon generates heat, it does not affect the electromagnetic cooker unless it is cooked empty. Further, as the adhesive for bonding the carbon and the clay pot body, for example, Allore Ceramic W of Toa Gosei Chemical Industry Co., Ltd. can be used, and KE-18 of Shin-Etsu Chemical as an organic adhesive can be used.
30 can also be used.

[0009]

FIG. 1 shows an embodiment of the present invention. After shaving the bottom of a pot and flattening the periphery, an adhesive 4 such as a Shin-Etsu Chemical adhesive is attached to the cut surface of the body 1 of the pot. Agent KE
-1830 was placed thereon, and the bottom surface made of carbon 2 having a hardened surface 3 was pressed and then hardened to be integrated.

FIG. 2 shows another embodiment, in which the clay pot body 1 and the periphery of the carbon 2 are fixed with a ceramic adhesive 4, and a silicone rubber is used as a sealing material 5 at the joint between the carbon 2 and the clay pot. This is an example in which the seal is used. in this case,
It can be used with an electromagnetic cooker, even when heated with gas,
A ceramic-based adhesive is used so that the adhesive can withstand gas flames. The inside is sealed with a silicon-based sealing material so as not to be wet.

The thickness of the carbon varies depending on the capacity of the pot, but is preferably about 3 to 8 mm. If the length is 3 mm or less, the heat generation efficiency of the electromagnetic cooker is deteriorated, and if the length is 8 mm or more, the earthen pot becomes heavy. In addition, since the thickness of the clay pot is usually as thick as 5 mm or more, if the glue alone can sufficiently support the contents of the clay pot, as long as the glue is firm,
Don't worry about leaking from the bottom. The size of the earthen pot is 1
It can handle from 5cm No.5 to 30cm No.10.

When the bottom of the stone pot is horizontally cut off to form only the body, and the bottom is made of carbon, the thickness of the stone pot is 10 to 15 mm.
If it is about 5 mm, it can be made in a well-balanced manner. Alternatively, the bottom of the stone pot may be hollowed out and a carbon disc-shaped bottom may be fitted therein and fixed with an adhesive. Alternatively, a plate having a thickness of about 1 mm may be made from a stone in a stone pot and stuck on the inner surface of the carbon so that the carbon does not appear. Alternatively, the inner side of the bottom of the carbon can be made concave like a concave lens. Even if the thickness of carbon becomes 15 mm, if a stone plate is not stuck, the temperature on the back side of the carbon bottom surface is about 100 ° C., and when the stone is stuck, the temperature of the carbon rises depending on the thickness of the stone. Therefore, it is necessary to reduce the thickness of the stone to several millimeters.

FIG. 3 shows still another embodiment of the present invention. In the case where a hole is provided at the bottom of the body 1 of a clay pot or a stone pot, a large stepped hole is provided at the top and a small step is provided at the bottom. A bottom plate member made of carbon 2 having a stepped portion to be locked is fitted and fixed with an adhesive 4 to be integrated. By doing so, the thickness of the carbon 2 can be reduced, the amount of carbon material used can be reduced, the cost can be reduced, and falling off can be prevented. For the same purpose, the hole may be a conical hole having a wide upper part and a narrow lower part. In any case, it is preferable to form a hardened portion 3 in which the surface hardness of carbon is increased by spraying ceramics on the surface of the carbon 2 plate, as in the above embodiment. In addition, a sealing material 5 similar to that of the above embodiment is provided inside. In FIG. 3, the thickness of the carbon 2 may be the same as the thickness of the bottom of the pot, or may be slightly reduced.

[0014]

As described above, according to the present invention, since the bottom portion of the earthen pot is scraped off, it is not necessary to make the bottom of the earthen pot flat, so that there is no need to change the conventional manufacturing process of the earthen pot. Accordingly, a commercially available clay pot can be processed and used for an electromagnetic cooker, so that the cost is reduced. In addition, since the bottom portion is scraped off and a carbon plate is attached to a flat portion, it is easy to manufacture. Also, since there is almost no gap between the surface of the electromagnetic cooker and the carbon heating element, sufficient heat generation efficiency can be expected. Also, since only the heat of boiling water is applied to the earthen pot, there is no need to use earth having a small thermal expansion especially for an electromagnetic cooker. In addition, since the structure is simple, there is no breakage portion and the device can be used for a long time.

Further, the surface of carbon is protected by a solidified sprayed layer of ceramics, and there is no fear that black stains of carbon will adhere even if it rubs against other materials. In addition, the surface of the hardened ceramic can be colored to a desired color with a heat-resistant paint, so that the appearance can be beautiful.

In particular, mass production is possible because the bottom of a commercially available earthen pot is simply cut off and a carbon disk having a hardened surface is attached. The shape of the pottery is easily distorted in the firing process, but can be used even if there is some distortion due to machining. These features have made it possible to make an earthenware pot for an electromagnetic cooker using carbon as a heating element at a lower price. In addition, when the clay pot is manufactured, if only the body without the bottom is manufactured from the beginning, the cost can be further reduced. In particular, in the case of a stone pot, it is only necessary to cut out a bottomless material from the beginning, which has a great economic effect. The present invention can be applied to a heat-resistant glass pan, a heat-resistant synthetic resin pan, and the like.

The hole at the bottom of the pot is a large stepped hole or a small stepped hole or conical hole at the bottom, and a stepped or conical part is formed so as to engage with this hole. The bottom plate member may be fixed with an adhesive to be integrated, and in this case, the carbon plate thickness can be reduced, the amount of carbon material used can be reduced, and the cost can be reduced. In addition, it is possible to prevent the falling off.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment in which the bottom of a clay pot of the present invention is cut off, and a bottom made of a carbon plate is fixed to a cut surface of a body portion of the clay pot.

FIG. 2 shows another embodiment of the present invention, in which the bottom made of a carbon plate is fixed to the body of the earthen pot from which the bottom has been cut off, and the joint between the inner carbon and the earthen pot is sealed using silicone rubber. It is sectional drawing of the Example which performed.

FIG. 3 is still another embodiment of the present invention, in which a hole formed in the bottom is stepped, and a bottom made of a carbon plate is fixed to the stepped portion and fixed with an adhesive. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body part of clay pot 2 Carbon of heating element 3 Hardened part of carbon surface 4 Adhesive 5 Sealing material

Claims (3)

[Claims] 1. A pot for an electromagnetic cooker, wherein a pot is made of a ceramic or stone pot, and a bottom is provided with a hole, and a carbon bottom plate member is fixed to the hole with an adhesive. 2. A carbon-made pot having a stepped hole or a conical hole having a large hole at the top and a small hole at the bottom, and a stepped portion or a conical portion formed so as to be engaged with the hole. 2. The bottom plate member according to claim 1, wherein the bottom plate member is fixed by an adhesive and integrated.
A pot for an electromagnetic cooker as described. 3. A carbon material whose surface hardness is increased by spraying ceramic onto the surface of a carbon bottom plate member, and impregnating and fixing a spraying agent to the sprayed layer and carbon. Item 4. A pot for an electromagnetic cooker according to item 1 or 2.