JP2001203070A - Heating and warmth keeping plate utilizing electromagnetic induction heating and cooking vessel having same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating unit that can be manufactured at low cost and that is not easily exfoliated. SOLUTION: A heating unit 5 made of magnetic material is composed of eight sector plates 6, and these sector plates 6 are joined to the bottom surface of a cooking pot body 2 made of non-magnetic material and form an induction heater(IH) cooking pot 1 having the sector plates 6 disposed in circular shape at the bottom of the cooking pot body 2. In this IH cooking pot 1, the thermal stress is dispersed to individual small sector plates 6 and the thermal distortion of the sector plates 6, i.e., the heating unit 5, becomes small, thereby making full use of the material of the sector plates 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulation plate utilizing electromagnetic induction heating and a container for electromagnetic induction cooking, and more particularly to a structure of a heating element.

[0002]

2. Description of the Related Art An IH cooker that heats and cooks a container such as a pot by an electromagnetic induction heating (hereinafter, abbreviated as "IH") method does not use a fire as a heating source, and thus is compared with a gas stove or the like. It is very popular recently because it has the advantages of high safety and high efficiency, and has the advantage that the indoor air is not polluted by gas combustion, and that it has good thermal efficiency and energy saving. .

When a non-magnetic material such as an aluminum alloy is used as a material for an IH cooking container used in such an IH cooking device, a plate made of a magnetic material such as iron or magnetic stainless steel is cast into the bottom of the container body. The heating element is provided by bonding such as brazing or hot pressing, or by spraying metal powder such as iron powder to form a coating.

For example, Japanese Patent Application Laid-Open No. Hei 5-177336 discloses a technique in which a heating element made of a magnetic metal plate is joined to the bottom of a container body by casting.

Japanese Patent Application Laid-Open No. 61-33612 discloses a method in which a projection formed on the bottom of a container body is fitted into a hole formed in a heating element made of a magnetic metal plate, and the heating element is connected to the container body by caulking or spot welding. A technique for bonding to a bottom surface is disclosed.

[0006] Japanese Patent No. 2880635 discloses a technique in which a heating element made of a magnetic metal plate is joined by hot pressing.

On the other hand, when a container made of a non-magnetic material is used as it is without joining a heating element, a heating plate to which the heating element is joined is prepared separately from the container, and this heating plate is placed on an IH cooker. It is also used to put a container on it.

As shown in FIG. 13A, the heating element 101 as described above is currently formed in a circular shape in accordance with the shape of the bottom surface of a container body 103 of a container 102 such as a pot. As shown in FIG. 13 (b),
It is formed by punching a long and narrow rectangular plate 104 made of a magnetic material into a circular shape with a press.

[0009]

However, when the heating element 101 is formed by punching a circular shape from an elongated rectangular band-shaped plate 104 as described above, as shown in FIG. 13B, many residual portions 105 remain after the punching. As a result, the yield is about 70%, depending on the size of the heating element 101. The remaining part of the remaining 30% 1
05 has no choice but to be disposed of, resulting in a large amount of waste of material, which leads to an increase in cost and is extremely uneconomical.

Further, as shown in FIG. 12A, an eddy current 106 generated by electromagnetic induction flows in a circle through the heating element 101 on the bottom surface of the container body 103 as indicated by a broken arrow. Since the heating element 101 is a single circular object, the heating element 101 may be damaged by deterioration of the bonding or external force.
When peeled off from the bottom surface of the container 3 (the peeled portion is indicated by a broken line in FIG. 12B and denoted by reference numeral 107), heat radiation to the bottom surface of the container body 103 is prevented at the peeled portion 107, but the eddy current 106 is peeled off. To keep flowing through part 107,
The exfoliated portion 107 is overheated and glows red, and becomes a dangerous state. Even if this peeling is partial and small at first, the thermal distortion increases due to overheating and the whole progresses at a stretch, so that the container becomes unusable.

Further, since the magnetic material, which is the material of the heating element 101, and the non-magnetic material, which is the material of the container body 103, are dissimilar metals, they have different coefficients of thermal expansion. For example, when the heating element 101 is made of iron or magnetic stainless steel and the container body 103 is made of an aluminum alloy, the coefficient of thermal expansion of the aluminum alloy is about twice as high as that of iron or the like. Thermal stress is generated in the body 101, and this thermal stress causes peeling of the heating element 101. In particular, since the heating element 101 is a single sheet, the thermal stress increases in proportion to the magnitude thereof, the thermal distortion increases, and the exfoliation becomes easy.

The present invention has been made in view of the foregoing, and an object of the present invention is to make a heating element inexpensive and to make it difficult to peel off.

[0013]

To achieve the above object, the present invention is characterized in that the heating element is divided into a plurality of heating elements.

[0014] Specifically, the present invention is directed to a heating and heating plate and an IH cooking container using IH, and has taken the following solutions.

That is, the invention according to claims 1 to 6 is
When the former heat-insulating plate using IH, that is, a container made of a non-magnetic material is used as it is without joining a heating element, it can be used by intervening between the IH cooking device and the container, or can be used for IH cooking in advance. The present invention relates to a heating and heat retaining plate used for heating a vessel, lowering it from an IH cooker, and placing a dish, a pan, a dish, etc. thereon to keep the temperature warm. The invention includes a plate body made of a non-magnetic material and a heating element joined to the plate body and made of a magnetic material, wherein the heating element is made up of a plurality of divided plates, and these divided plates are attached to the plate body. It is characterized by being arranged in a circle.

According to the first aspect of the present invention, since the heating element is composed of a plurality of divided plates arranged in a circular shape, the heating element is largely circular like a single heating element. Each small split plate is made by punching or cutting with a close gap between them, so that the remaining waste that remains after punching or cutting is reduced, the yield is improved, and the material is improved. Waste is reduced, resulting in an economical and inexpensive heating element.

Further, when a part of the divided plate constituting the heating element is separated from the plate main body due to deterioration of bonding or external force, the eddy current flows avoiding the separated portion, so that the separated portion does not generate heat and is not heated. The danger is avoided, and the peeling does not proceed without an increase in thermal strain due to overheating, and the expansion of the peeled portion is suppressed.

Furthermore, the thermal stress acting on the divided plate due to the difference in the coefficient of thermal expansion between the divided plate and the plate body is dispersed in each of the small divided plates and compared with the case of a single large heating element. Therefore, the heat distortion is not so large, and the split plate is difficult to peel off.

According to a second aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, adjacent divided plates are arranged at a predetermined interval from each other.

According to the above configuration, in the invention according to the second aspect, the adjacent divided plates do not contact each other, and the influence of peeling does not affect the adjacent divided plates.

According to a third aspect of the present invention, in the heating and heat retaining plate utilizing the IH according to the first aspect, each of the divided plates has a rectangular band-shaped plate on one side so that its shape is alternately reversed. By cutting diagonally from the long side to the other long side, the cut line becomes a parting line and is composed of a cut-out plate that is separated and cut from an adjacent divided plate.

According to the above configuration, in the third aspect of the present invention, the divided plates are cut out from the belt-shaped plate in a state where they are arranged without any gap, and the yield is almost 100%.

According to a fourth aspect of the present invention, in the heating and heat retaining plate utilizing the IH according to the first aspect, each of the divided plates has a triangular shape, a trapezoidal shape, a sectoral shape, or a shape similar to these shapes. It is characterized by being formed.

[0024] With the above arrangement, according to the fourth aspect of the present invention, the shape of the split plate is embodied.
A plurality of divided plates are arranged in a circular shape and packed without leaving a large gap between adjacent divided plates, so that thermal efficiency does not decrease.

According to a fifth aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, a large number of small holes are formed in each divided plate.

According to the fifth aspect of the present invention, when the divided plate is cast into the plate body, the molten metal penetrates into the small holes of the divided plate, and the divided plate is firmly joined to the plate body. Is done.

According to a sixth aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, each of the divided plates is any one of cast-in, brazing, hot pressing, cold pressing, and caulking. Characterized in that it is joined to the plate body.

According to the above configuration, in the invention described in claim 6, the manner of joining the divided plate to the plate main body is embodied.

The invention according to claims 7 to 13 is characterized in that the latter I
The present invention relates to an H cooking container, that is, a container of a type in which a heating element is joined to the bottom surface of a container body made of a non-magnetic material, and is directly mounted on an IH cooking device for use. Claim 1 to the bottom of the container body made of non-magnetic material
6. A heating and heat retaining plate utilizing IH according to any one of 6.

According to the above configuration, the seventh aspect of the invention can provide the same functions and effects as the first to sixth aspects of the invention.

The invention according to claim 8 presupposes an IH cooking container composed of a container body made of a non-magnetic material and a heating element joined to the bottom surface of the container body and made of a magnetic material.
The heating element includes a plurality of divided plates, and the divided plates are arranged in a circle on the bottom surface of the container body.

With the above arrangement, the eighth aspect of the invention has the same function and effect as the first aspect of the invention.

According to a ninth aspect of the present invention, in the container for IH cooking according to the eighth aspect, the adjacent divided plates are
It is characterized by being arranged at a predetermined interval from each other.

According to the above configuration, the ninth aspect of the invention has the same function and effect as the second aspect of the invention.

According to a tenth aspect of the present invention, in the IH cooking container according to the eighth aspect, each of the divided plates has a rectangular band-shaped plate on one long side so that the shape thereof is alternately reversed. By cutting diagonally from the other long side, the cut line is a parting line, which is a cutout plate separated and cut from an adjacent divided plate.

According to the above configuration, in the tenth aspect, the same operation and effect as those of the third aspect can be obtained.

According to an eleventh aspect of the present invention, in the IH cooking container according to the eighth aspect, each of the divided plates is formed in any one of a triangular shape, a trapezoidal shape, a sectoral shape, and shapes similar to these shapes. It is characterized by being.

According to the above configuration, the eleventh aspect of the invention has the same function and effect as the fourth aspect of the invention.

According to a twelfth aspect of the present invention, in the IH cooking container according to the eighth aspect, a large number of small holes are formed in each divided plate.

According to the above configuration, the twelfth aspect of the invention has the same function and effect as the fifth aspect of the invention.

According to a thirteenth aspect of the present invention, in the IH cooking container according to the eighth aspect, each of the divided plates is formed by any one of cast-in, brazing, hot pressing, cold pressing, and caulking. It is characterized by being joined to the bottom surface.

According to the above arrangement, the thirteenth aspect of the invention has the same function and effect as the sixth aspect of the invention.

[0043]

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

FIG. 7 shows a state in which the pot 1 as an IH cooking container according to one embodiment of the present invention is placed on an IH cooking device 11. The IH cooker 11 includes a case 13 in which a top plate 12 made of heat-resistant glass is provided at an upper part,
An induction coil 14 is spirally arranged below the top plate 12, and a high-frequency current generator 1 is arranged below the induction coil 14.
5 are arranged. In the IH cooking device 11, when a high-frequency current is supplied from the high-frequency current generator 15 to the induction coil 14, magnetic lines of force 16 are generated so as to cross a heating element 5 (divided plate 6) of the pan 1 which will be described later. An eddy current 17 (shown in FIG. 10) is generated inside the (split plate 6). When the eddy current 17 is converted into Joule heat, the heating element 5 (divided plate 6) generates heat and heats the pot 1.

On the other hand, the pot 1 is provided with a pot body 2 as a container body made of a non-magnetic material such as an aluminum alloy, a copper alloy, and a magnesium alloy. The heating element 5 of the present invention, which is made of a magnetic material such as steel, is joined to the heating element 5.

As shown in FIG. 1A, the heating element 5
Is an eight-division type composed of eight division plates 6. These eight divided plates 6 have a shape in which the vertex at the apex side of the isosceles triangle is chipped, and the missing part is directed to the center of the bottom of the pot body 2, and the bottom side is positioned at the outer periphery of the bottom of the pot body 2. The pot body 2 is arranged in a circle around the center of the bottom surface. The arrangement area of the dividing plate 6 covers almost the entire area of the bottom surface of the pot body 2 except for the central portion of the bottom surface of the pot body 2 surrounded by the missing portions of the eight dividing plates 6 and the outer peripheral portion of the bottom surface of the pot body 2. The adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited, and may be determined within a range that does not affect the thermal efficiency. As described above, the split plate 6, that is, the absence of the heat generation region at the center portion of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooking device 11.

As shown in FIG. 1B, each of the divided plates 6 has an elongated rectangular band-shaped plate 7 from one long side to the other long side such that the shape thereof is alternately reversed. By hanging and cutting obliquely, the cut line becomes a parting line and is formed of a cutout plate that is separated and cut from the adjacent divided plate 6. In this example, each of the divided plates 6 is a cutting operation in which the operation of cutting the slender rectangular band-shaped plate 7 obliquely along a straight line inclined to the right and the operation of cutting obliquely along a straight line inclined to the left are adjacent cutting operations. By repeating the process at equal intervals alternately so that the ends of the lines do not touch each other, the individual lines are cut into substantially isosceles triangles.

The heating element 5 composed of the eight divided plates 6 is directly joined to the bottom surface of the pot main body 2 by means of a press-fit casting to be arranged in a circle, and the IH cooking pot according to one embodiment of the present invention. 1 is produced.

The procedure for assembling the heating element 5 is as follows.
As shown in FIG. 8A, after eight divided plates 6 are arranged in a circle at the center of the bottom surface of the cavity 22 of the lower mold 21,
A molten metal 23 made of a non-magnetic material such as an aluminum alloy is injected into the cavity 22 with a ladle 24. Then
As shown in FIG. 8B, the upper mold 25 is lowered and clamped, and the molten metal 23 is pressed to wait for the molten metal 23 to solidify. Thereafter, as shown in FIG.
5 is lifted, and the pot 1 as a molded product is released from the mold. Thus, the IH cooking pot 1 in which the heating element 5 (divided plate 6) is directly joined to the bottom of the pot body 2 is manufactured.

As a method of joining the heating element 5 (divided plate 6) to the bottom surface of the pot body 2, besides casting, the pot body 2 cast in the press lower mold 26 is turned upside down as shown in FIG. After placing the brazing material 27 thereon and the heating element 5 (divided plate 6) thereon, the upper press 28 and the lower press 26 press in a high-temperature furnace to generate heat. The IH cooking pot 1 in which the body 5 (divided plate 6) is directly joined to the bottom of the pot body 2 may be manufactured. Also,
Instead of using the brazing material 27, hot pressing or cold pressing such as pressure welding forging technology or the like may be adopted. Furthermore, the heating element 5 (divided plate 6) may be joined to the bottom of the pot body 2 by caulking. Good.

As described above, in this embodiment, since the heating element 5 is constituted by the eight divided plates 6 arranged in a circular shape, each small divided plate 6 is cut at a narrow interval. As compared with the case where a single heating element is punched out in a large circle, the residual portion to be disposed of is greatly reduced, and the yield can be improved. Therefore, the heating element 5 can be manufactured economically and inexpensively by using the material without waste, and by extension, the low-cost I
H cooking pot 1 can be used.

When the IH cooking pot 1 in this embodiment is used by being placed on an IH cooking device 11, FIG.
As shown in (a), eddy current 1 generated by electromagnetic induction
7 flows in a circle through the heating element 5 (divided plate 6) on the bottom surface of the pot main body 2 as indicated by a broken arrow. In this case, when a part of the divided plates 6 constituting the heating element 5 is peeled off from the bottom surface of the pot body 2 due to deterioration of bonding or external force, etc. (the peeled portion is indicated by a broken line in FIG. Since the eddy current 17 flows while avoiding the peeled portion 8, heat generation of the peeled portion 8 can be avoided, and the peeled portion 8 expands without risk of overheating and progress of peeling due to increased thermal distortion. Can be suppressed.

Further, in this embodiment, the thermal stress acting on the dividing plate 6 due to the difference in the coefficient of thermal expansion between the dividing plate 6 and the bottom surface of the pot main body 2 is distributed to the individual small dividing plates 6. (1) Since the size of the heating element can be reduced as compared with the case of a single large heating element, thermal distortion does not increase and the split plate 6 can be hardly peeled off. Further, since there is a space between the adjacent divided plates 6, it is possible to avoid the influence of the separated divided plates 6 from being brought into contact with each other so as not to affect the adjacent divided plates 6. In addition, the gap is not large, and the adjacent divided plates 6
Are packed as close as possible, so that a decrease in thermal efficiency can be prevented.

In addition, in this embodiment, each of the divided plates 6 is formed by diagonally extending a rectangular band-shaped plate 7 from one long side to the other long side so that the shape thereof is alternately reversed. This cutting line is a parting line, which is a parting line that is cut off from the adjacent divided plate 6 as a parting line, so that the divided plate 6 can be cut out from the strip-shaped plate 7 in a state where they are arranged without gaps. As a result, the yield can be made nearly 100%.

The heating element 5 is not limited to the eight-division type as described above, and the shape of the divided plate 6 constituting the heating element 5 is not limited to the substantially isosceles triangle as described above. Next, some of the modified examples are illustrated in FIGS. In the five modified examples shown in FIGS. 2 to 6, the same operation and effects as those of the above-described embodiment can be obtained.

(Modification 1) As shown in FIG. 2A, the heating element 5 of this example is an eight-segment type composed of eight divided plates 6 like the heating element 5 of FIG. However, the shape of each divided plate 6 is an isosceles triangle with no vertices missing. These eight divided plates 6 are arranged in a circle around the center of the bottom surface of the pot body 2 with the apexes facing the center of the bottom surface of the pot body 2 and the bottom side facing the outer periphery of the bottom surface of the pot body 2. The vertex of each division plate 6 approaches the center of the bottom of the pot body 2, and the arrangement area of the division plate 6 is
Except for the outer peripheral portion of the bottom surface of the pot main body 2, it covers almost the entire area of the bottom surface of the pot main body 2, and adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. According to this, since the vertices of the eight split plates 6 are close to the center of the bottom surface of the pot main body 2, it is possible to increase the heat generation area of the center portion of the bottom surface of the pan main body 2.

As shown in FIG. 2 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 whose shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Is slightly different, so cut it out as follows. That is, in this example, each divided plate 6
The diagonal cutting of the elongated rectangular strip 7 along the straight line inclined to the right and the diagonal cutting along the straight line inclined to the left are performed so that the ends of the adjacent cutting lines are in contact with each other. By alternately repeating the process, the image is cut out into an independent isosceles triangle.

(Modification 2) As shown in FIG. 3A, the heating element 5 of this embodiment is also an eight-segment type comprising eight split plates 6 like the heating element 5 of FIG. However, the shape of each division plate 6 is a sector shape. These eight divided plates 6 direct an arc portion having a small radius of curvature and a short arc length toward the center of the bottom surface of the pot body 2, and an arc portion having a large radius of curvature and a long arc length are formed on the bottom surface of the pot body 2. The pot is arranged in a circle around the center of the bottom of the pot body 2 toward the outer periphery. The arrangement area of the divided plates 6 includes a center portion of the bottom surface of the pot body 2 surrounded by an inner arc portion having a small radius of curvature of the eight divided plates 6 and a short arc length, and an outer peripheral portion of the bottom surface of the pot body 2. Except for almost the entire area of the bottom surface of the pot body 2 excluding, adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the split plate 6 at the center of the bottom of the pot main body 2, that is, the absence of the heating area is caused by the IH cooking device 11.
Corresponding to the spiral shape of the induction coil 14, which has already been described in the above-described embodiment. According to this, the outer arc portions having a large radius of curvature and a long arc length of the eight split plates 6 are located at equal intervals and circularly along the outer periphery of the bottom surface of the pot main body 2, and the IH cooking device 11. Of the induction coil 14, it is possible to increase the heat generation area of the outer peripheral portion of the bottom surface of the pot main body 2.

As shown in FIG. 3 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Is slightly different, so cut it out as follows. That is, in this example, each divided plate 6
Is to cut the slender rectangular band-shaped plate 7 obliquely along a straight line inclined to the right and to cut it obliquely along a straight line inclined to the left so that the ends of adjacent cutting lines do not come into contact with each other. Repeatedly and alternately at equal intervals, cut the narrower one between adjacent cutting lines into an arc shape with a smaller radius of curvature and a shorter arc length, and the wider one on the opposite side with a larger radius of curvature. By cutting into an arc shape with a long arc length, it is cut out into an independent fan shape individually.

(Modification 3) As shown in FIG. 4 (a), the heating element 5 of this example is also an eight-segment type composed of eight divided plates 6 like the heating element 5 of FIG. 1 (a). However, the shape of each divided plate 6 is approximated to a triangular shape by cutting two sides in an arc shape with the same direction and the same radius of curvature in the isosceles triangular divided plate 6 in FIG. It has a shape. The eight divided plates 6 are arranged such that the straight line portion with a narrow interval between the two arc portions is directed toward the center of the bottom surface of the pot main body 2 and the straight line portion with a wide interval is directed toward the outer periphery of the bottom surface of the pot main body 2. Are arranged in a circle around the center. The arrangement area of the division plate 6 is substantially the bottom surface of the pan body 2 excluding the center portion of the bottom surface of the pan body 2 surrounded by the straight line portion on the inner side with a narrow interval between the eight division plates 6 and the outer peripheral portion of the bottom surface of the pan body 2. The divided plate 6 extends over the entire area and is spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the absence of the split plate 6, that is, the heat-generating region at the center of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooker 11, which is the same as the above-described one. This has already been described in the embodiment. According to this, a design effect can be expected by the combination of the linear portion and the curved portion.

As shown in FIG. 4 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Are different, so cut out as follows. That is, in this example, each split plate 6
The operation of obliquely cutting the elongated rectangular strip 7 along an arc inclined to the right and the operation of obliquely cutting along an arc inclined to the left are alternately performed so that the ends of adjacent cutting lines do not touch each other. By performing the process repeatedly at equal intervals, each is cut out into a substantially independent isosceles triangle.

(Modification 4) As shown in FIG. 5A, the heating element 5 of the present example is different from the heating element 5 described above.
This is a 5-split type composed of a plurality of split plates 6, and each split plate 6 has a trapezoidal shape. These five divided plates 6 are arranged such that the upper side which is the short side is directed toward the center of the bottom surface of the pot body 2 and the lower bottom which is the long side is directed toward the outer periphery of the bottom surface of the pot body 2, around the center of the bottom surface of the pot body 2. They are arranged in a circle. The arrangement area of the dividing plate 6 covers almost the entire area of the bottom surface of the pot body 2 excluding the central portion of the bottom surface of the pot body 2 surrounded by the upper bottoms of the five dividing plates 6 and the outer peripheral portion of the bottom surface of the pot body 2. The adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the absence of the split plate 6, that is, the heat-generating region at the center of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooker 11, which is the same as the above-described one. This has already been described in the embodiment.

As shown in FIG. 5 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line, and is made of a cut-out plate separated and cut from the adjacent divided plate 6. The shape of the split plate 6 of this example is a shape obtained by widening the split plate 6 of FIG. 1A in the horizontal direction. Therefore, basically, as described with reference to FIG. The work of diagonally cutting the elongated rectangular band-shaped plate 7 along a straight line inclined to the right and the work of diagonally cutting the straight plate inclined to the left so that the ends of adjacent cutting lines do not come into contact with each other, and By making the intervals of the cutting lines wider and alternately repeating them at an equal interval, the individual pieces are cut out into independent trapezoids.

(Modification 5) As shown in FIG. 6 (a), the heating element 5 of this embodiment is an eight-segment type composed of eight divided plates 6 like the heating element 5 of FIG. 1 (a). The shape of each divided plate 6 is such that a large number of small holes 6a are formed on the entire surface of the divided plate 6 of an isosceles triangle in FIG. The presence of the small holes 6a allows the molten metal to penetrate into the small holes 6a when joining the divided plates 6 to the bottom of the pot body 2 by casting to enhance the joining property of the divided plates 6 to the bottom of the pot body 2. Can be.

The number of the divided plates 6 is not limited to the above examples, but can be appropriately increased or decreased according to the size of the container such as the pot 1 or the intended use, and the shape thereof can be similarly changed.

In the above, the heating element 5 (divided plate 6) is directly joined to the bottom of the pot body 2 and is arranged in a circle. However, as shown in FIG. 11, the heating element 5 made of a magnetic material is used.
The plate body 4 made of a non-magnetic material (split plate 6)
To form the heating / warming plate 3 in which the divided plates 6 are arranged in a circle, and this may be used as one independent product. When the pot 1 made of a non-magnetic material is used as it is without joining the heating element, the heating / heating plate 3 is interposed between the IH cooker 11 and the pot 1 for use. Alternatively, the heat insulation plate 3 is
After heating on the H cooker 11, the heated heat-insulating plate 3 is lowered from the IH cooker 11,
Place pots, dishes, etc. and use it for heat retention. Also in this case, the number and shape of the divided plates 6 and the method of cutting out from the belt-shaped plate 7 are the same as described above.

Although not shown, the heating and heat retaining plate 3 constructed as described above may be used as a product independent of the pot 1, but depending on the shape and structure of the pot 1, the heating and heat retaining plate 3 may be used as a pot body. The two bottom surfaces may be integrally joined and used.

Further, the above-described one embodiment and the first modified example
In FIG. 5, the pot 1 is exemplified as an IH cooking container, but the present invention can be applied to any other cooking containers.

[0069]

As described above, according to the present invention, a heating element made of a magnetic material is composed of a plurality of divided plates, and these divided plates are circularly arranged on a plate body made of a non-magnetic material. Either a heating and heating plate using IH, or this heating and heating plate is integrally joined to the bottom of the container body, or a heating element composed of a plurality of divided plates is directly joined to the bottom of the container body. I
H Cooking container. Therefore, a small divided plate can be cut out in a packed state without punching the heating element into one large piece, and an economical and inexpensive heating element can be obtained with good yield by using no material. Further, since the eddy current flows while avoiding the separated portion of the split plate, danger due to overheating of the separated portion and progress of the separation can be suppressed. Further, the thermal strain is distributed to the small divided plates divided into a plurality of plates, so that the divided plates can be hardly peeled off.

[Brief description of the drawings]

FIG. 1A is a bottom view of a pot showing an arrangement state of divided plates constituting a heating element in one embodiment of the present invention;
(B) is a figure explaining the point which cuts out the above-mentioned division plate from a strip plate.

FIG. 2A is a diagram corresponding to FIG. 1A of Modification Example 1, and FIG.
FIG. 3 is a diagram corresponding to FIG.

3A is a diagram corresponding to FIG. 1A of Modification Example 2, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 4A is a diagram corresponding to FIG. 1A of Modification Example 3, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 5A is a diagram corresponding to FIG. 1A of Modification Example 4, and FIG.
FIG. 7 is a diagram corresponding to FIG.

6A is a diagram corresponding to FIG. 1A of Modification Example 5, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 7 is a schematic configuration diagram of an IH cooking device in a state where an IH cooking pot is placed thereon.

8A to 8C are process diagrams for explaining a method of joining the heating elements by casting, wherein FIG. 8A is a pouring process diagram, FIG. 8B is a pressing process diagram, and FIG. 8C is a demolding process diagram.

FIG. 9 is a diagram illustrating a method of joining the heating elements by brazing.

FIG. 10 (a) is a bottom view of a pot showing an eddy current flow before peeling occurs in the heating element in one embodiment of the present invention, and FIG. 10 (b) is a heating element in Embodiment 1 of the present invention. FIG. 4 is a bottom view of the pan showing how eddy currents flow after separation occurs in the pan.

FIG. 11 is a schematic configuration diagram of an IH cooking device in a state where a heating and heat retaining plate is used.

FIG. 12A is a bottom view of a pot showing how an eddy current flows before a heating element is separated in a conventional example, and FIG. 12B is an eddy current after the heating element is separated in the conventional example. It is a bottom view of the pot showing how to flow.

FIG. 13 (a) is a bottom view of a pot showing a state in which a heating element is joined in a conventional example, and FIG. 13 (b) is a view for explaining how to cut the heating element from a strip plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pot (container) 2 Pot main body (container main body) 3 Heat insulation plate 4 Plate main body 5 Heating element 6 Split plate 6a Small hole 7 Strip plate

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[Procedure amendment]

[Submission date] November 8, 2000 (200.11.
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Heat insulation plate using electromagnetic induction heating and container for electromagnetic induction heating cooking

[Claims]

3. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein each of the divided plates is formed into any one of a triangle, a trapezoid, a sector, and a shape similar to these shapes. Heat insulation plate using electromagnetic induction heating.

4. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein a number of small holes are opened in each of the divided plates. .

5. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein each of the divided plates is joined to the plate body by any of cast-in, brazing, hot pressing, cold pressing, and caulking. A heat insulation plate using electromagnetic induction heating.

6. An electromagnetic induction heating cooking, wherein the heating and heat retaining plate utilizing electromagnetic induction heating according to any one of claims 1 to 5 is joined to a bottom surface of the container body made of a non-magnetic material. Container.

7. An electromagnetic induction heating cooking container comprising a container body made of a non-magnetic material and a heating element joined to a bottom surface of the container body and made of a magnetic material, wherein the heating element comprises a plurality of heating elements. It consists of divided plates, and these divided plates are arranged in a circle on the bottom surface of the container body , and each divided plate has its shape alternately reversed.
The rectangular strip from one long side to the other
By cutting it diagonally over the long side of
Separated from adjacent split plates as parting lines
Ri out electromagnetic induction heating cooking container according to claim Rukoto such a cut plate.

8. The electromagnetic induction heating cooking container according to claim 7 , wherein adjacent divided plates are arranged at a predetermined interval from each other.

9. The electromagnetic induction heating cooking container according to claim 7, wherein each of the divided plates, characterized triangular, trapezoidal, that are formed in any shape of shape similar to the fan and these shapes Container for electromagnetic induction heating cooking.

[Claim 1 0] In the electromagnetic induction heating cooking container according to claim 7, wherein, in each division plate, the electromagnetic induction heating cooking container, wherein a number of small holes are opened.

[Claim 1 1] In the electromagnetic induction heating cooking container according to claim 7, wherein each of the divided plates, insert casting, brazing, hot bonding, are bonded to the container body bottom by either cold crimping and swaging A container for electromagnetic induction heating and cooking.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulation plate utilizing electromagnetic induction heating and a container for electromagnetic induction cooking, and more particularly to a structure of a heating element.

[0002]

2. Description of the Related Art An IH cooker that heats and cooks a container such as a pot by an electromagnetic induction heating (hereinafter, abbreviated as "IH") method does not use a fire as a heating source, and thus is compared with a gas stove or the like. It is very popular recently because it has the advantages of high safety and high efficiency, and has the advantage that the indoor air is not polluted by gas combustion, and that it has good thermal efficiency and energy saving. .

When a non-magnetic material such as an aluminum alloy is used as a material for an IH cooking container used in such an IH cooking device, a plate made of a magnetic material such as iron or magnetic stainless steel is cast into the bottom of the container body. The heating element is provided by bonding such as brazing or hot pressing, or by spraying metal powder such as iron powder to form a coating.

For example, Japanese Patent Application Laid-Open No. Hei 5-177336 discloses a technique in which a heating element made of a magnetic metal plate is joined to the bottom of a container body by casting.

Japanese Patent Application Laid-Open No. 61-33612 discloses a method in which a projection formed on the bottom of a container body is fitted into a hole formed in a heating element made of a magnetic metal plate, and the heating element is connected to the container body by caulking or spot welding. A technique for bonding to a bottom surface is disclosed.

[0006] Japanese Patent No. 2880635 discloses a technique in which a heating element made of a magnetic metal plate is joined by hot pressing.

On the other hand, when a container made of a non-magnetic material is used as it is without joining a heating element, a heating plate to which the heating element is joined is prepared separately from the container, and this heating plate is placed on an IH cooker. It is also used to put a container on it.

As shown in FIG. 13A, the heating element 101 as described above is currently formed in a circular shape in accordance with the shape of the bottom surface of a container body 103 of a container 102 such as a pot. As shown in FIG. 13 (b),
It is formed by punching a long and narrow rectangular plate 104 made of a magnetic material into a circular shape with a press.

[0009]

However, when the heating element 101 is formed by punching a circular shape from an elongated rectangular band-shaped plate 104 as described above, as shown in FIG. 13B, many residual portions 105 remain after the punching. As a result, the yield is about 70%, depending on the size of the heating element 101. The remaining part of the remaining 30% 1
05 has no choice but to be disposed of, resulting in a large amount of waste of material, which leads to an increase in cost and is extremely uneconomical.

Further, as shown in FIG. 12A, an eddy current 106 generated by electromagnetic induction flows in a circle through the heating element 101 on the bottom surface of the container body 103 as indicated by a broken arrow. Since the heating element 101 is a single circular object, the heating element 101 may be damaged by deterioration of the bonding or external force.
When peeled off from the bottom surface of the container 3 (the peeled portion is indicated by a broken line in FIG. 12B and denoted by reference numeral 107), heat radiation to the bottom surface of the container body 103 is prevented at the peeled portion 107, but the eddy current 106 is peeled off. To keep flowing through part 107,
The exfoliated portion 107 is overheated and glows red, and becomes a dangerous state. Even if this peeling is partial and small at first, the thermal distortion increases due to overheating and the whole progresses at a stretch, so that the container becomes unusable.

Further, since the magnetic material, which is the material of the heating element 101, and the non-magnetic material, which is the material of the container body 103, are dissimilar metals, they have different coefficients of thermal expansion. For example, when the heating element 101 is made of iron or magnetic stainless steel and the container body 103 is made of an aluminum alloy, the coefficient of thermal expansion of the aluminum alloy is about twice as high as that of iron or the like. Thermal stress is generated in the body 101, and this thermal stress causes peeling of the heating element 101. In particular, since the heating element 101 is a single sheet, the thermal stress increases in proportion to the magnitude thereof, the thermal distortion increases, and the exfoliation becomes easy.

The present invention has been made in view of the foregoing, and an object of the present invention is to make a heating element inexpensive and to make it difficult to peel off.

[0013]

In order to achieve the above-mentioned object, the present invention is characterized in that the heating element is divided into a plurality of parts and the way of division is devised.

[0014] Specifically, the present invention is directed to a heating and heating plate and an IH cooking container using IH, and has taken the following solutions.

That is, the invention according to claims 1 to 5 is
When the former heat-insulating plate using IH, that is, a container made of a non-magnetic material is used as it is without joining a heating element, it can be used by intervening between the IH cooking device and the container, or can be used for IH cooking in advance. The present invention relates to a heating and heat retaining plate used for heating a vessel, lowering it from an IH cooker, and placing a dish, a pan, a dish, etc. thereon to keep the temperature warm. The invention includes a plate body made of a non-magnetic material and a heating element joined to the plate body and made of a magnetic material, wherein the heating element is made up of a plurality of divided plates, and these divided plates are attached to the plate body. Each of the divided plates is obliquely cut from one long side to the other long side so that the divided plates are alternately inverted in shape. , Characterized in that the cutting line is made of cut plate is cut out and separated from the divided adjacent plates becomes parting line.

According to the first aspect of the present invention, since the heating element is composed of a plurality of divided plates arranged in a circular shape, the heating element is largely circular like a single heating element. Each small split plate is made by punching or cutting with a close interval between them, so that there is less waste left after punching or cutting and the yield is better, Waste is reduced, resulting in an economical and inexpensive heating element. Further, the divided plates are cut out from the band-shaped plate in a state where they are arranged without gaps, and the yield becomes almost 100%.

Further, when a part of the divided plate constituting the heating element is separated from the plate main body due to deterioration of bonding or external force, the eddy current flows avoiding the separated portion, so that the separated portion does not generate heat and is not heated. The danger is avoided, and the peeling does not proceed without an increase in thermal strain due to overheating, and the expansion of the peeled portion is suppressed.

Furthermore, the thermal stress acting on the divided plate due to the difference in the coefficient of thermal expansion between the divided plate and the plate body is dispersed in each of the small divided plates and compared with the case of a single large heating element. Therefore, the heat distortion is not so large, and the split plate is difficult to peel off.

According to a second aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, adjacent divided plates are arranged at a predetermined interval from each other.

According to the above configuration, in the invention according to the second aspect, the adjacent divided plates do not contact each other, and the influence of peeling does not affect the adjacent divided plates.

According to a third aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, each of the divided plates has a shape of any one of a triangle, a trapezoid, a sector, and a shape similar to these shapes. It is characterized by being formed.

According to the above configuration, in the invention according to the third aspect, the shape of the divided plate is embodied.
A plurality of divided plates are arranged in a circular shape and packed without leaving a large gap between adjacent divided plates, so that thermal efficiency does not decrease.

According to a fourth aspect of the present invention, in the heating and heat retaining plate using the IH according to the first aspect, a large number of small holes are formed in each of the divided plates.

According to the above construction, when the divided plate is cast into the plate body, the molten metal penetrates into the small holes of the divided plate and the divided plate is firmly joined to the plate body. Is done.

According to a fifth aspect of the present invention, in the heating and heat retaining plate utilizing the IH according to the first aspect, each of the divided plates is any one of cast-in, brazing, hot pressing, cold pressing and caulking. Characterized in that it is joined to the plate body.

According to the above configuration, in the invention described in claim 5, the manner of joining the divided plate to the plate body is embodied.

[0027] The inventions according to claims 6 to 11 are the latter.
The present invention relates to an H cooking container, that is, a container of a type in which a heating element is joined to the bottom surface of a container main body made of a non-magnetic material, and is used directly mounted on an IH cooking device. Claim 1 to the bottom of the container body made of non-magnetic material
A heating and heat-insulating plate using the IH according to any one of the items 5 is joined.

According to the above configuration, in the invention described in claim 6, the same operation and effect as those in the inventions described in claims 1 to 5 can be obtained.

The invention according to claim 7 is based on the premise that an IH cooking container comprises a container body made of a non-magnetic material and a heating element joined to the bottom surface of the container body and made of a magnetic material.
The heating element is composed of a plurality of divided plates, these divided plates are arranged in a circle on the bottom surface of the container body, and each divided plate has a rectangular band-like plate so that its shape is alternately reversed. By cutting diagonally from the long side to the other long side, the cut line becomes a parting line and is composed of a cut-out plate separated and cut from an adjacent divided plate.

According to the above configuration, the seventh aspect of the invention can provide the same functions and effects as the first aspect of the invention.

The invention according to claim 8 is the container for IH cooking according to claim 7, wherein the adjacent divided plates are
It is characterized by being arranged at a predetermined interval from each other.

With the above arrangement, the eighth aspect of the invention has the same function and effect as the second aspect of the invention.

According to a ninth aspect of the present invention, in the IH cooking container according to the seventh aspect, each of the divided plates is formed into any one of a triangular shape, a trapezoidal shape, a sectoral shape, and a shape similar to these shapes. It is characterized by being.

According to the above configuration, the ninth aspect of the invention has the same function and effect as the third aspect of the invention.

According to a tenth aspect of the present invention, in the IH cooking container according to the seventh aspect, a large number of small holes are formed in each divided plate.

According to the above configuration, in the tenth aspect, the same operation and effect as those of the fourth aspect can be obtained.

According to an eleventh aspect of the present invention, in the IH cooking container according to the seventh aspect, each of the divided plates is formed by any of cast-in, brazing, hot pressing, cold pressing, and caulking. It is characterized by being joined to the bottom surface.

According to the above configuration, the invention described in claim 11 has the same operation and effect as the invention described in claim 5.

[0039]

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

FIG. 7 shows a state in which a pot 1 as an IH cooking container according to an embodiment of the present invention is placed on an IH cooking device 11. The IH cooker 11 includes a case 13 in which a top plate 12 made of heat-resistant glass is provided at an upper part,
An induction coil 14 is spirally arranged below the top plate 12, and a high-frequency current generator 1 is arranged below the induction coil 14.
5 are arranged. In the IH cooking device 11, when a high-frequency current is supplied from the high-frequency current generator 15 to the induction coil 14, magnetic lines of force 16 are generated so as to cross a heating element 5 (divided plate 6) of the pan 1 which will be described later. An eddy current 17 (shown in FIG. 10) is generated inside the (split plate 6). When the eddy current 17 is converted into Joule heat, the heating element 5 (divided plate 6) generates heat and heats the pot 1.

On the other hand, the pot 1 is provided with a pot body 2 as a container body made of a non-magnetic material such as an aluminum alloy, a copper alloy, and a magnesium alloy. The heating element 5 of the present invention, which is made of a magnetic material such as steel, is joined to the heating element 5.

As shown in FIG. 1A, the heating element 5
Is an eight-division type composed of eight division plates 6. These eight divided plates 6 have a shape in which the vertex at the apex side of the isosceles triangle is chipped, and the missing part is directed to the center of the bottom of the pot body 2, and the bottom side is positioned at the outer periphery of the bottom of the pot body 2. The pot body 2 is arranged in a circle around the center of the bottom surface. The arrangement area of the dividing plate 6 covers almost the entire area of the bottom surface of the pot body 2 except for the central portion of the bottom surface of the pot body 2 surrounded by the missing portions of the eight dividing plates 6 and the outer peripheral portion of the bottom surface of the pot body 2. The adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited, and may be determined within a range that does not affect the thermal efficiency. As described above, the split plate 6, that is, the absence of the heat generation region at the center portion of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooking device 11.

As shown in FIG. 1 (b), each of the divided plates 6 has an elongated rectangular band-shaped plate 7 from one long side to the other long side such that the shape thereof is alternately reversed. By hanging and cutting obliquely, the cut line becomes a parting line and is formed of a cutout plate that is separated and cut from the adjacent divided plate 6. In this example, each of the divided plates 6 is a cutting operation in which the operation of cutting the slender rectangular band-shaped plate 7 obliquely along a straight line inclined to the right and the operation of cutting obliquely along a straight line inclined to the left are adjacent cutting operations. By repeating the process at equal intervals alternately so that the ends of the lines do not touch each other, the individual lines are cut into substantially isosceles triangles.

The heating element 5 composed of the eight divided plates 6 is directly joined to the bottom surface of the pot main body 2 by means of a press-fit casting and arranged in a circle, and the IH cooking pot according to one embodiment of the present invention. 1 is produced.

The procedure for assembling the heating element 5 is as follows.
As shown in FIG. 8A, after eight divided plates 6 are arranged in a circle at the center of the bottom surface of the cavity 22 of the lower mold 21,
A molten metal 23 made of a non-magnetic material such as an aluminum alloy is injected into the cavity 22 with a ladle 24. Then
As shown in FIG. 8B, the upper mold 25 is lowered and clamped, and the molten metal 23 is pressed to wait for the molten metal 23 to solidify. Thereafter, as shown in FIG.
5 is lifted, and the pot 1 as a molded product is released from the mold. Thus, the IH cooking pot 1 in which the heating element 5 (divided plate 6) is directly joined to the bottom of the pot body 2 is manufactured.

As a method of joining the heating element 5 (divided plate 6) to the bottom of the pot body 2, besides casting, the pot body 2 cast into the lower press die 26 is turned upside down as shown in FIG. After placing the brazing material 27 thereon and the heating element 5 (divided plate 6) thereon, the upper press 28 and the lower press 26 press in a high-temperature furnace to generate heat. The IH cooking pot 1 in which the body 5 (divided plate 6) is directly joined to the bottom of the pot body 2 may be manufactured. Also,
Instead of using the brazing material 27, hot pressing or cold pressing such as pressure welding forging technology or the like may be adopted. Furthermore, the heating element 5 (divided plate 6) may be joined to the bottom of the pot body 2 by caulking. Good.

As described above, in this embodiment, since the heating element 5 is constituted by the eight divided plates 6 arranged in a circular shape, the individual small divided plates 6 are cut with a narrow interval therebetween. As compared with the case where a single heating element is punched out in a large circle, the residual portion to be disposed of is greatly reduced, and the yield can be improved. Therefore, the heating element 5 can be manufactured economically and inexpensively by using the material without waste, and by extension, the low-cost I
H cooking pot 1 can be used.

Further, when the IH cooking pot 1 in this embodiment is used by placing it on the IH cooking device 11, FIG.
As shown in (a), eddy current 1 generated by electromagnetic induction
7 flows in a circle through the heating element 5 (divided plate 6) on the bottom surface of the pot main body 2 as indicated by a broken arrow. In this case, when a part of the divided plates 6 constituting the heating element 5 is peeled off from the bottom surface of the pot body 2 due to deterioration of bonding or external force, etc. (the peeled portion is indicated by a broken line in FIG. Since the eddy current 17 flows while avoiding the peeled portion 8, heat generation of the peeled portion 8 can be avoided, and the peeled portion 8 expands without risk of overheating and progress of peeling due to increased thermal distortion. Can be suppressed.

Further, in this embodiment, the thermal stress acting on the dividing plate 6 due to the difference in the coefficient of thermal expansion between the dividing plate 6 and the bottom surface of the pot body 2 is distributed to the individual small dividing plates 6. (1) Since the size of the heating element can be reduced as compared with the case of a single large heating element, thermal distortion does not increase and the split plate 6 can be hardly peeled off. Further, since there is a space between the adjacent divided plates 6, it is possible to avoid the influence of the separated divided plates 6 from being brought into contact with each other so as not to affect the adjacent divided plates 6. In addition, the gap is not large, and the adjacent divided plates 6
Are packed as close as possible, so that a decrease in thermal efficiency can be prevented.

In addition, in this embodiment, each of the divided plates 6 has a rectangular band-shaped plate 7 extending obliquely from one long side to the other long side so that the shape thereof is alternately opposite. This cutting line is a parting line, which is a parting line that is cut off from the adjacent divided plate 6 as a parting line, so that the divided plate 6 can be cut out from the strip-shaped plate 7 in a state where they are arranged without gaps. As a result, the yield can be made nearly 100%.

The heating element 5 is not limited to the eight-division type as described above, and the shape of the divided plate 6 constituting the heating element 5 is not limited to the above-described substantially isosceles triangle. Next, some of the modified examples are illustrated in FIGS. In the five modified examples shown in FIGS. 2 to 6, the same operation and effects as those of the above-described embodiment can be obtained.

(Modification 1) As shown in FIG. 2A, the heating element 5 of this example is an eight-segment type comprising eight divided plates 6 in the same manner as the heating element 5 of FIG. However, the shape of each divided plate 6 is an isosceles triangle with no vertices missing. These eight divided plates 6 are arranged in a circle around the center of the bottom surface of the pot body 2 with the apexes facing the center of the bottom surface of the pot body 2 and the bottom side facing the outer periphery of the bottom surface of the pot body 2. The vertex of each division plate 6 approaches the center of the bottom of the pot body 2, and the arrangement area of the division plate 6 is
Except for the outer peripheral portion of the bottom surface of the pot main body 2, it covers almost the entire area of the bottom surface of the pot main body 2, and adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. According to this, since the vertices of the eight split plates 6 are close to the center of the bottom surface of the pot main body 2, it is possible to increase the heat generation area of the center portion of the bottom surface of the pan main body 2.

As shown in FIG. 2 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Is slightly different, so cut it out as follows. That is, in this example, each divided plate 6
The diagonal cutting of the elongated rectangular strip 7 along the straight line inclined to the right and the diagonal cutting along the straight line inclined to the left are performed so that the ends of the adjacent cutting lines are in contact with each other. By alternately repeating the process, the image is cut out into an independent isosceles triangle.

(Modification 2) As shown in FIG. 3 (a), the heating element 5 of this example is also an eight-segment type composed of eight divided plates 6 like the heating element 5 of FIG. 1 (a). However, the shape of each division plate 6 is a sector shape. These eight divided plates 6 direct an arc portion having a small radius of curvature and a short arc length toward the center of the bottom surface of the pot body 2, and an arc portion having a large radius of curvature and a long arc length are formed on the bottom surface of the pot body 2. The pot is arranged in a circle around the center of the bottom of the pot body 2 toward the outer periphery. The arrangement area of the divided plates 6 includes a center portion of the bottom surface of the pot body 2 surrounded by an inner arc portion having a small radius of curvature of the eight divided plates 6 and a short arc length, and an outer peripheral portion of the bottom surface of the pot body 2. Except for almost the entire area of the bottom surface of the pot body 2 excluding, adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the split plate 6 at the center of the bottom of the pot main body 2, that is, the absence of the heating area is caused by the IH cooking device 11.
Corresponding to the spiral shape of the induction coil 14, which has already been described in the above-described embodiment. According to this, the outer arc portions having a large radius of curvature and a long arc length of the eight split plates 6 are located at equal intervals and circularly along the outer periphery of the bottom surface of the pot main body 2, and the IH cooking device 11. Of the induction coil 14, it is possible to increase the heat generation area of the outer peripheral portion of the bottom surface of the pot main body 2.

As shown in FIG. 3 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Is slightly different, so cut it out as follows. That is, in this example, each divided plate 6
Is to cut the slender rectangular band-shaped plate 7 obliquely along a straight line inclined to the right and to cut it obliquely along a straight line inclined to the left so that the ends of adjacent cutting lines do not come into contact with each other. Repeatedly and alternately at equal intervals, cut the narrower one between adjacent cutting lines into an arc shape with a smaller radius of curvature and a shorter arc length, and the wider one on the opposite side with a larger radius of curvature. By cutting into an arc shape with a long arc length, it is cut out into an independent fan shape individually.

(Modification 3) As shown in FIG. 4 (a), the heating element 5 of this embodiment is also an eight-segment type consisting of eight divided plates 6, similarly to the heating element 5 of FIG. 1 (a). However, the shape of each divided plate 6 is approximated to a triangular shape by cutting two sides in an arc shape with the same direction and the same radius of curvature in the isosceles triangular divided plate 6 in FIG. It has a shape. The eight divided plates 6 are arranged such that the straight line portion with a narrow interval between the two arc portions is directed toward the center of the bottom surface of the pot main body 2 and the straight line portion with a wide interval is directed toward the outer periphery of the bottom surface of the pot main body 2. Are arranged in a circle around the center. The arrangement area of the division plate 6 is substantially the bottom surface of the pan body 2 excluding the center portion of the bottom surface of the pan body 2 surrounded by the straight line portion on the inner side with a narrow interval between the eight division plates 6 and the outer peripheral portion of the bottom surface of the pan body 2. The divided plate 6 extends over the entire area and is spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the absence of the split plate 6, that is, the heat-generating region at the center of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooker 11, which is the same as the above-described one. This has already been described in the embodiment. According to this, a design effect can be expected by the combination of the linear portion and the curved portion.

As shown in FIG. 4 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 whose shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line and is separated from the adjacent divided plate 6 and cut out. Are different, so cut out as follows. That is, in this example, each split plate 6
The operation of obliquely cutting the elongated rectangular strip 7 along an arc inclined to the right and the operation of obliquely cutting along an arc inclined to the left are alternately performed so that the ends of adjacent cutting lines do not touch each other. By performing the process repeatedly at equal intervals, each is cut out into a substantially independent isosceles triangle.

(Modification 4) As shown in FIG. 5A, the heating element 5 of this embodiment is different from the heating element 5 described above.
This is a 5-split type composed of a plurality of split plates 6, and each split plate 6 has a trapezoidal shape. These five divided plates 6 are arranged such that the upper side which is the short side is directed toward the center of the bottom surface of the pot body 2 and the lower bottom which is the long side is directed toward the outer periphery of the bottom surface of the pot body 2, around the center of the bottom surface of the pot body 2. They are arranged in a circle. The arrangement area of the dividing plate 6 covers almost the entire area of the bottom surface of the pot body 2 excluding the central portion of the bottom surface of the pot body 2 surrounded by the upper bottoms of the five dividing plates 6 and the outer peripheral portion of the bottom surface of the pot body 2. The adjacent divided plates 6 are spaced apart from each other by a predetermined distance. This interval is, for example, about 1 to 2 mm, but is not limited as in the above-described embodiment. As described above, the absence of the split plate 6, that is, the heat-generating region at the center of the bottom surface of the pot main body 2 corresponds to the spiral shape of the induction coil 14 of the IH cooker 11, which is the same as the above-described one. This has already been described in the embodiment.

As shown in FIG. 5 (b), each of the divided plates 6 is, like the divided plate 6 of FIG. 1 (a), an elongated rectangular band-shaped plate 7 so that its shape is alternately reversed. Is cut obliquely from one long side to the other long side, so that the cut line becomes a parting line, and is made of a cut-out plate separated and cut from the adjacent divided plate 6. The shape of the split plate 6 of this example is a shape obtained by widening the split plate 6 of FIG. 1A in the horizontal direction. Therefore, basically, as described with reference to FIG. The work of diagonally cutting the elongated rectangular band-shaped plate 7 along a straight line inclined to the right and the work of diagonally cutting the straight plate inclined to the left so that the ends of adjacent cutting lines do not come into contact with each other, and By making the intervals of the cutting lines wider and alternately repeating them at an equal interval, the individual pieces are cut out into independent trapezoids.

(Modification 5) As shown in FIG. 6A, the heating element 5 of this example is an eight-segment type composed of eight divided plates 6 like the heating element 5 of FIG. The shape of each divided plate 6 is such that a large number of small holes 6a are formed on the entire surface of the divided plate 6 of an isosceles triangle in FIG. The presence of the small holes 6a allows the molten metal to penetrate into the small holes 6a when joining the divided plates 6 to the bottom of the pot body 2 by casting to enhance the joining property of the divided plates 6 to the bottom of the pot body 2. Can be.

The number of the divided plates 6 is not limited to the above examples, but can be appropriately increased or decreased according to the size of the container such as the pan 1 or the intended use, and the shape thereof can be similarly changed.

In the above, the heating element 5 (divided plate 6) is directly joined to the bottom of the pot body 2 and is arranged in a circle. However, as shown in FIG. 11, the heating element 5 made of a magnetic material is used.
The plate body 4 made of a non-magnetic material (split plate 6)
To form the heating / warming plate 3 in which the divided plates 6 are arranged in a circle, and this may be used as one independent product. When the pot 1 made of a non-magnetic material is used as it is without joining the heating element, the heating / heating plate 3 is interposed between the IH cooker 11 and the pot 1 for use. Alternatively, the heat insulation plate 3 is
After heating on the H cooker 11, the heated heat-insulating plate 3 is lowered from the IH cooker 11,
Place pots, dishes, etc. and use it for heat retention. Also in this case, the number and shape of the divided plates 6 and the method of cutting out from the belt-shaped plate 7 are the same as described above.

Although not shown, the heating and heat retaining plate 3 configured as described above may be used as a product independent of the pot 1, but depending on the shape and structure of the pot 1, the heating and heat retaining plate 3 may be used as a pot body. The two bottom surfaces may be integrally joined and used.

Further, the above-described embodiment and the first modified example
In FIG. 5, the pot 1 is exemplified as an IH cooking container, but the present invention can be applied to any other cooking containers.

[0065]

As described above, according to the present invention, a heating element made of a magnetic material is composed of a plurality of divided plates, and these divided plates are circularly arranged on a plate body made of a non-magnetic material. Either a heating and heating plate using IH, or this heating and heating plate is integrally joined to the bottom of the container body, or a heating element composed of a plurality of divided plates is directly joined to the bottom of the container body. I
H Cooking container. Therefore, a small divided plate can be cut out in a packed state without punching the heating element into one large piece, and an economical and inexpensive heating element can be obtained with good yield by using no material. Further, since the eddy current flows while avoiding the separated portion of the split plate, danger due to overheating of the separated portion and progress of the separation can be suppressed. Further, the thermal strain is distributed to the small divided plates divided into a plurality of plates, so that the divided plates can be hardly peeled off. Further, each of the divided plates is cut obliquely by cutting a rectangular band-shaped plate obliquely from one long side to the other long side so that the shape thereof is alternately reversed. Since it is composed of the cut-out plate that is separated and cut out from the adjacent divided plate as a line, the divided plate can be cut out from the belt-shaped plate in a state where the divided plates are arranged without a gap, and the yield can be made nearly 100%.

[Brief description of the drawings]

FIG. 1A is a bottom view of a pot showing an arrangement state of divided plates constituting a heating element in one embodiment of the present invention;
(B) is a figure explaining the point which cuts out the above-mentioned division plate from a strip plate.

FIG. 2A is a diagram corresponding to FIG. 1A of Modification Example 1, and FIG.
FIG. 3 is a diagram corresponding to FIG.

3A is a diagram corresponding to FIG. 1A of Modification Example 2, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 4A is a diagram corresponding to FIG. 1A of Modification Example 3, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 5A is a diagram corresponding to FIG. 1A of Modification Example 4, and FIG.
FIG. 7 is a diagram corresponding to FIG.

6A is a diagram corresponding to FIG. 1A of Modification Example 5, and FIG.
FIG. 7 is a diagram corresponding to FIG.

FIG. 7 is a schematic configuration diagram of an IH cooking device in a state where an IH cooking pot is placed thereon.

8A to 8C are process diagrams for explaining a method of joining the heating elements by casting, wherein FIG. 8A is a pouring process diagram, FIG. 8B is a pressing process diagram, and FIG. 8C is a demolding process diagram.

FIG. 9 is a diagram illustrating a method of joining the heating elements by brazing.

FIG. 10 (a) is a bottom view of a pot showing an eddy current flow before peeling occurs in the heating element in one embodiment of the present invention, and FIG. 10 (b) is a heating element in Embodiment 1 of the present invention. FIG. 4 is a bottom view of the pan showing how eddy currents flow after separation occurs in the pan.

FIG. 11 is a schematic configuration diagram of an IH cooking device in a state where a heating and heat retaining plate is used.

FIG. 12A is a bottom view of a pot showing how an eddy current flows before a heating element is separated in a conventional example, and FIG. 12B is an eddy current after the heating element is separated in the conventional example. It is a bottom view of the pot showing how to flow.

FIG. 13 (a) is a bottom view of a pot showing a state in which a heating element is joined in a conventional example, and FIG. 13 (b) is a view for explaining how to cut the heating element from a strip plate.

[Description of Signs] 1 Pan (container) 2 Pan main body (container main body) 3 Heat insulation plate 4 Plate main body 5 Heating element 6 Split plate 6a Small hole 7 Strip plate

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Okamura 3-44-17-8 Nagatsuka, Asaminami-ku, Hiroshima-shi, Hiroshima F-term in Hiroshima Aluminum Industry Co., Ltd. (Reference) 3K051 AB04 AD35 CD42 CD43 4B055 AA09 AA13 BA13 BA15 BA21 CA03 CB16 CB27 CC46 FA02 FB04 FB05 FC06 FE05

Claims (13)

[Claims] 1. A heating apparatus comprising: a plate body made of a non-magnetic material; and a heating element joined to the plate body and made of a magnetic material, wherein the heating element comprises a plurality of divided plates, and the divided plates are formed of the plate. A heat insulation plate using electromagnetic induction heating, which is arranged in a circular shape on the main body. 2. The heating and heating plate utilizing electromagnetic induction heating according to claim 1, wherein adjacent divided plates are arranged at a predetermined interval from each other. Insulation plate. 3. The heat-insulating plate using electromagnetic induction heating according to claim 1, wherein each of the divided plates has a rectangular band-shaped plate from one long side to the other so that the shape thereof is alternately reversed. Heat insulation using electromagnetic induction heating, characterized in that the cut line is a parting line, which is cut off as a parting line by cutting it obliquely over the long side. plate. 4. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein each of the divided plates is formed in any one of a triangular shape, a trapezoidal shape, a fan shape, and a shape similar to these shapes. Heat insulation plate using electromagnetic induction heating. 5. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein a number of small holes are opened in each of the divided plates. . 6. The heat insulation plate using electromagnetic induction heating according to claim 1, wherein each of the divided plates is joined to the plate body by any of cast-in, brazing, hot pressing, cold pressing, and caulking. A heat insulation plate using electromagnetic induction heating. 7. The electromagnetic induction heating cooking, wherein the heating and keeping plate using electromagnetic induction heating according to claim 1 is joined to the bottom of the container body made of a non-magnetic material. Container. 8. An electromagnetic induction heating and cooking container comprising a container body made of a non-magnetic material and a heating element joined to a bottom surface of the container body and made of a magnetic material, wherein the heating element comprises a plurality of heating elements. A container for electromagnetic induction heating and cooking comprising divided plates, wherein the divided plates are arranged in a circle on the bottom surface of the container main body. 9. The container for electromagnetic induction heating and cooking according to claim 8, wherein adjacent divided plates are arranged at a predetermined interval from each other. 10. The electromagnetic induction heating cooking container according to claim 8, wherein each of the divided plates has a rectangular band-shaped plate from one long side to the other long side such that the shape thereof is alternately reversed. A cutting plate that is cut off diagonally by cutting the plate into a parting line and cut out from an adjacent divided plate. 11. The electromagnetic induction heating cooking container according to claim 8, wherein each of the divided plates is formed in any one of a triangle, a trapezoid, a sector, and a shape similar to these shapes. Container for electromagnetic induction heating cooking. 12. The electromagnetic induction heating cooking container according to claim 8, wherein a number of small holes are formed in each of the divided plates. 13. The container for electromagnetic induction heating and cooking according to claim 8, wherein each of the divided plates is joined to the bottom surface of the container body by any of cast-in, brazing, hot pressing, cold pressing, and caulking. A container for electromagnetic induction heating cooking, characterized in that: