JP6453256B2 - Cooker using electromagnetic induction heating method - Google Patents

Description

  The present invention relates to a cooker that uses an electromagnetic induction heating method.

  Conventionally, as in Patent Document 1, a cooking device using an electromagnetic induction heating method has been proposed.

JP 2003-102616 A

  In such a cooker, a magnetic heating element is attached by caulking or the like to the bottom surface of the non-magnetic pot body. However, with only caulking, there is a risk that the joining state of both will be loosened and heat from the heating element will not be transmitted. is there.

  Accordingly, an object of the present invention is to provide a cooking device in which heat from a heating element is easily transmitted.

  The cooker using the electromagnetic induction heating method according to the present invention includes a pan body, a heating element having a hardness higher than at least the bottom surface of the pan body, and a heating element attached to the bottom surface. A plurality of rings protruding toward the bottom surface are integrally formed on the surface of the inner ring, and the outer peripheral wall of the inner ring among the plurality of rings is in a positional relationship facing the inner peripheral wall of the outer ring. The heating element is fixed to the bottom surface by pressing the surface on the opposite side of the surface of the heating element that contacts the bottom surface and caulking so that the ring of the metal bites into the bottom surface.

  By pressing the top surface of the heating element and causing the plurality of rings in the heating element to bite into the bottom surface of the pan body, primary fixing (first fixing) to the bottom surface of the heating element is performed, and further, Secondary fixing (second fixing) to the bottom surface is performed.

  For this reason, it is easy to maintain the fixed state of the bottom face and the heating element as compared with the form in which the heating element is fixed to the bottom face only by caulking without providing the ring-shaped protrusion.

  Further, since the contact area between the bottom surface and the heating element can be increased by the amount of the plurality of ring-shaped protrusions, the efficiency of heat conduction from the heating element to the pan body can be increased.

  Preferably, a ring-shaped recess is provided on the surface of the heating element opposite to the side in contact with the bottom surface.

  The deformation of the recess absorbs the difference in expansion between the pan body and the heating element, and even when the pot body expands or contracts greatly, the fixing state of the heating element and the pan body can be easily maintained.

  Preferably, the heating element has a hollow disk shape, and the circular shape of the inner peripheral edge of the hollow disk shape and the plurality of rings are arranged concentrically.

  More preferably, a first protrusion and a second protrusion used for caulking are provided on the bottom surface, the first protrusion has a hollow column shape, and the second protrusion is a first protrusion. The heating element has a hollow column shape surrounding the side surface of the protrusion, and is mounted between the first protrusion and the second protrusion, and between the first protrusion and the second protrusion on the bottom surface, In the vicinity of the first protrusion, a first groove is provided in which an inner protrusion ring provided on the inner peripheral edge of the heating element is fitted, and between the first protrusion and the second protrusion on the bottom surface, In the vicinity of the two protrusions, a second groove is provided in which an outer protruding ring provided on the outer peripheral edge of the heating element is fitted.

  Preferably, the bottom surface is provided with a first protrusion and a second protrusion used for caulking, the first protrusion has a hollow column shape, and the second protrusion is The heating element has a hollow column shape surrounding the side surface of one protrusion, and is mounted between the first protrusion and the second protrusion, and between the first protrusion and the second protrusion on the bottom surface, In the vicinity of the first protrusion, there is provided a first groove part into which an inner protruding ring provided on the heating element is fitted, and is between the first protrusion part and the second protrusion part on the bottom surface, and the second protrusion part. Is provided with a second groove for fitting the outer protruding ring provided on the side closer to the outer peripheral edge of the heating element as compared with the inner protruding ring, on the opposite side to the side in contact with the bottom surface of the inner protruding ring The surface of the ring is provided with a ring-shaped first recess and is opposite to the side of the outer protruding ring that contacts the bottom surface. On the surface, it is provided a ring-shaped second recess.

  Preferably, among the plurality of rings, the ring closest to the outer peripheral edge portion has a larger amount of protrusion toward the bottom surface than the other rings.

  By increasing the amount of protrusion of the ring close to the peripheral edge, the contact area with the bottom surface can be increased, and it is easy to conduct heat conduction to the position of the pan body away from the heating element (for example, the side of the pan body). It becomes possible.

  Preferably, the tips of the plurality of rings have a thinner shape than the root portion.

  The method of manufacturing a cooker using the electromagnetic induction heating method according to the present invention includes a heat generation in which a heating element having a hollow plate shape is inserted between protrusions used for caulking provided on the bottom surface of a pan body. Opposite to the surface of the heating element in contact with the bottom surface so that a plurality of rings that are formed integrally with the body insertion step and the surface of the heating element that contacts the bottom surface and protrude toward the bottom surface bite into the bottom surface A pressing step of pressing the side surface, and a crimping step of crimping by deforming the protrusion so as to cover the outer peripheral edge and the inner peripheral edge of the hollow plate shape.

  As described above, according to the present invention, it is possible to provide a cooking device in which heat from a heating element is easily transmitted.

In the cooking appliance in 1st Embodiment, it is a perspective view which shows the state before a heat generating body is attached to a pan main body. It is a perspective view of the heat generating body of the state which faced up the surface (lower surface) on the side which contacts the bottom face in 1st Embodiment. It is a cross-sectional block diagram of the heat generating body of the state which faced up the surface (lower surface) on the side which contacts the bottom face in 1st Embodiment. It is a perspective view which shows the pan main body and heat generating body after the heat generating body insertion process in 1st Embodiment. It is a perspective view which shows the pan body and heat generating body after the pushing process in 1st Embodiment. It is a perspective view which shows the pan main body, the heat generating body, the 1st crimping jig, and the 2nd crimping jig after the fitting process in 1st Embodiment. It is a perspective view which shows the pan main body, the heat generating body, the 1st crimping jig, and the 2nd crimping jig after the crimping process in 1st Embodiment. It is a perspective view which shows the pan main body and heat generating body after the removal process in 1st Embodiment. It is a perspective view which shows the pan main body and heat generating body after the scraping process in 1st Embodiment. In the cooking device in a 1st embodiment, it is a section lineblock diagram showing the state before a heating element is attached to a pan body. It is a cross-sectional block diagram which shows the pan body and the heat generating body after the heat generating body insertion process in 1st Embodiment. It is a section lineblock diagram showing the pan body after a pushing process in a 1st embodiment, and a heating element. It is a cross-sectional block diagram which shows the pan main body, the heat generating body, the 1st crimping jig, and the 2nd crimping jig after the fitting process in 1st Embodiment. It is a section lineblock diagram showing the pan main part after a caulking process in the 1st embodiment, a heating element, the 1st caulking jig, and the 2nd caulking jig. It is a cross-sectional block diagram which shows the pan main body and heat generating body after the removal process in 1st Embodiment. It is a section lineblock diagram showing the pan body after a shaving process in a 1st embodiment, and a heating element. FIG. 6 is a cross-sectional configuration diagram of a heating element in a state where a surface (lower surface) on the side in contact with the bottom surface in the second embodiment is faced up, including a ring with a thin tip and a large amount of protrusion near an outer peripheral edge. . A heating element with the surface (bottom surface) on the side in contact with the bottom surface in the second embodiment facing up, including a ring with a thin tip and a large amount of protrusion, but close to the outer peripheral edge, It is a cross-sectional block diagram which shows the thing after a scraping process. In a cooking device in a 3rd embodiment, it is a section lineblock diagram showing the state before a heating element is attached to a pan body. It is a cross-sectional block diagram which shows the pan main body and heat generating body after the heat generating body insertion process in 3rd Embodiment. It is a section lineblock diagram showing the pan body after a pushing process in a 3rd embodiment, and a heating element. It is a cross-sectional block diagram which shows the pan main body, the heat generating body, the 1st crimping jig | tool, and the 2nd crimping jig | tool after the fitting process in 3rd Embodiment. It is a section lineblock diagram showing the pan main part after a caulking process in the 3rd embodiment, a heating element, the 1st caulking jig, and the 2nd caulking jig. It is a cross-sectional block diagram which shows the pan main body and heat generating body after the removal process in 3rd Embodiment. It is a section lineblock diagram showing the pan body after a shaving process in a 3rd embodiment, and a heating element. It is a perspective view which shows the pan main body and heat generating body after the scraping process in 3rd Embodiment. It is a section lineblock diagram showing a pan main part and a heating element when a heating element in a 3rd embodiment expands. It is a section lineblock diagram showing a pan main part and a heating element when a heating element contracts in a 3rd embodiment.

  Hereinafter, the first embodiment will be described with reference to the drawings. The cooker 1 using the electromagnetic induction heating method in the first embodiment includes a pan body (a container for putting a cooking object) 10 and a heating element 20 (see FIGS. 1 to 18). Moreover, when attaching the heat generating body 20 to the pan main body 10, the 1st crimping jig | tool 51 and the 2nd crimping jig | tool 52 are used. In 1st Embodiment, although the structure of the cooking appliance 1 is demonstrated using a pan, the other cooking appliances 1 such as a frying pan may be sufficient.

  In addition, in order to make it easy to distinguish from other members, in FIGS. 1 and 4 to 9, the upper surface 20 a of the heating element 20 (the surface opposite to the surface (the lower surface 20 b) on the side in contact with the bottom surface 11). However, the hatching is not indispensable for carrying out the present invention.

  The pan body 10 is made of a non-magnetic material such as an aluminum alloy, and a first protrusion portion 11a to a third protrusion portion 11c, a first groove portion 12a, and a second groove portion that are used to attach the heating element 20 to the bottom surface 11. 12b is provided.

  The first protrusion 11a has a substantially hollow column shape (for example, a hollow cylinder shape), and the height of the substantially hollow column shape is longer than the height of the heat generating member 20 before the heating element 20 is attached. Have

  The second protruding portion 11b has a substantially hollow column shape (for example, a hollow column shape) surrounding the side surface of the first protruding portion 11a. In the state before the heating element 20 is attached, the height of the substantially hollow column shape is It has a dimension longer than the height of the heating element 20.

  The 3rd projection part 11c has the substantially hollow column shape (for example, hollow cylinder shape) surrounding the side surface of the 2nd projection part 11b.

  The first space 101 surrounded by the first protrusion 11a and the bottom surface 11 is a lower part (bottom surface of the first crimping jig 51) so that the first crimping jig 51 can be fitted inside the first protrusion 11a. 11 (part on the side in contact with 11) (substantially cylindrical shape in the first embodiment).

  The second space 102 surrounded by the first protrusion 11a, the second protrusion 11b, and the bottom surface 11 is heated so that the heating element 20 can be inserted between the first protrusion 11a and the second protrusion 11b. It has substantially the same shape (in the first embodiment, a substantially donut shape) as the lower surface 20b of the body 20 (the surface on the side in contact with the bottom surface 11).

  A ring in which an inner protruding ring 21a provided on the inner peripheral edge of the heating element 20 is fitted between the first protrusion 11a and the second protrusion 11b on the bottom surface 11 and in the vicinity of the first protrusion 11a. A first groove 12a having a shape is provided.

  A ring in which an outer protruding ring 21b provided on the outer peripheral edge of the heating element 20 is fitted in the vicinity of the second protrusion 11b between the first protrusion 11a and the second protrusion 11b on the bottom surface 11. A second groove portion 12b having a shape is provided.

Between the 1st groove part 12a and the 2nd groove part 12b in the bottom face 11, it has a planar shape which protrudes rather than the 1st groove part 12a or the 2nd groove part 12b (the groove | channel corresponding to 1st ring a1-5th ring a5 is provided. Absent).
The projecting amount of the planar shape is the same as the projecting amount of the inner projecting ring 21a and the outer projecting ring 21b, and is smaller than the projecting amount of the first projecting portion 11a and the second projecting portion 11b.

  A third space surrounded by the second protrusion 11b, the third protrusion 11c, and the bottom surface 11 so that the second crimping jig 52 can be fitted between the second protrusion 11b and the third protrusion 11c. 103 has substantially the same shape (substantially donut shape in the first embodiment) as the lower part of the second crimping jig 52 (the part on the side in contact with the bottom surface 11).

  The heating element 20 including the inner protruding ring 21a, the outer protruding ring 21b, the first ring a1 to the fifth ring a5 is integrally formed of a magnetic material such as ferritic stainless steel having a hardness higher than that of the bottom surface 11 of the pan body 10. And has a hollow plate shape (for example, a hollow disc shape) having a thickness of 2.0 mm to 2.5 mm.

  An inner protrusion ring 21 a that protrudes toward the bottom surface 11 is integrally formed on the inner peripheral edge portion of the surface (lower surface 20 b) of the heating element 20 that contacts the bottom surface 11. A plurality of rings (first ring a1) projecting toward the bottom surface 11 and surrounding the side surface of the inner projecting ring 21a are formed integrally with the outer projecting ring 21b. To fifth ring a5) are integrally formed.

The first ring a1 surrounds the side surface of the inner protruding ring 21a, and the outer peripheral wall of the inner protruding ring 21a is in a positional relationship facing the inner peripheral wall of the first ring a1.
The second ring a2 surrounds the side surface of the first ring a1, and the outer peripheral wall of the first ring a1 is in a positional relationship facing the inner peripheral wall of the second ring a2.
The third ring a3 surrounds the side surface of the second ring a2, and the outer peripheral wall of the second ring a2 is in a positional relationship facing the inner peripheral wall of the third ring a3.
The fourth ring a4 surrounds the side surface of the third ring a3, and the outer peripheral wall of the third ring a3 is in a positional relationship facing the inner peripheral wall of the fourth ring a4.
The fifth ring a5 surrounds the side surface of the fourth ring a4, and the outer peripheral wall of the fourth ring a4 is in a positional relationship facing the inner peripheral wall of the fifth ring a5.
The outer protruding ring 21b surrounds the side surface of the fifth ring a5, and the outer peripheral wall of the fifth ring a5 is in a positional relationship facing the inner peripheral wall of the outer protruding ring 21b.

  The inner protruding ring 21a, the first ring a1, the second ring a2, the third ring a3, the fourth ring a4, the fifth ring a5, and the outer protruding ring 21b are holes 21c (inner peripheral edge formed inside the inner peripheral edge. Are arranged concentrically around an axis LX passing through the center of the circle.

  On the lower surface 20b, a first groove g1 is formed between the inner projecting ring 21a and the first ring a1, and a second groove g2 is formed between the first ring a1 and the second ring a2. A third groove g3 is formed between the second ring a2 and the third ring a3, a fourth groove g4 is formed between the third ring a3 and the fourth ring a4, and a fourth ring a4. The fifth groove g5 is formed between the fifth ring a5 and the sixth groove g6 is formed between the fifth ring a5 and the outer protruding ring 21b.

  Except for the first groove g1 to the sixth groove g6, the transverse section of the heating element 20 has a hollow circular shape, and the longitudinal section of the heating element 20 has a trapezoidal shape with a lower side corresponding to the lower surface 20b. A trapezoidal shape in which a taper of a trapezoidal leg is provided such that it is longer than the upper side corresponding to the surface (upper surface 20a) opposite to the lower surface 20b of the heating element 20, and the upper surface 20a overlaps inside the lower surface 20b when viewed from the vertical direction. Have

  Further, instead of the taper, a step may be provided on the upper surface 20a so that the outer peripheral edge portion and the inner peripheral edge portion are thinner than other regions, and the longitudinal section may have a convex shape.

  The heating element 20 is attached between the first protrusion 11a and the second protrusion 11b on the bottom surface 11, and is fixed by pressing the first ring a1 to the fifth ring a5 and caulking.

  Specifically, by pressing the upper surface 20a of the heating element 20, the inner protruding ring 21a of the heating element 20 is fitted into the first groove portion 12a in the bottom surface 11, and the outer protruding ring 21b is fitted into the second groove portion 12b of the bottom surface 11. The first ring a1 to the fifth ring a5 are pushed into the plane between the first groove portion 12a and the second groove portion 12b on the bottom surface 11 to perform primary fixing (first fixing to the bottom surface 11 of the heating element 20). ) Is performed.

  After the first fixing, the protrusions (first protrusion 11a and second protrusion 11b) provided around the region where the heating element 20 is attached so as to cover the tapered portion of the peripheral edge of the heating element 20. Secondary fixing (second fixing) to the bottom surface 11 of the heating element 20 is performed by the caulking to be deformed.

  When caulking is performed, the protrusions (first space 101 and third space 103) on the side surfaces (first space 101 and third space 103) that are not adjacent to the heating element 20 on the side surfaces of the protrusions (first protrusion 11a and second protrusion 11b). Jigs (first caulking jig 51 and second caulking jig 52) are attached to the first space 101 and the third space 103 so that the projecting part 11a and the second projecting part 11b) are not deformed.

  The first caulking jig 51 has a substantially columnar shape (for example, a cylindrical shape), the second caulking jig 52 has a substantially hollow columnar shape (for example, a hollow columnar shape), and the heating element 20 is attached to the pan body 10. Used as a caulking jig when attaching to the bottom surface 11.

  The first caulking jig 51 and the second caulking jig 52 are made of a material that is harder than the first protrusion 11a and the second protrusion 11b.

  Next, a procedure for attaching the heating element 20 to the bottom surface 11 of the pan body 10 will be described.

  With the bottom surface 11 of the pan body 10 facing up (see FIGS. 1 and 10), the heating element 20 is inserted into the second space 102 so that the first protrusion 11a enters the hole 21c (heating element insertion step). FIG. 4 and FIG. 11). In this state, the heating element 20 has the tip portions of the first ring a1 to the fifth ring a5 in contact with the bottom surface 11, but other regions (tips of the inner protruding ring 21a and the outer protruding ring 21b, the first grooves g1 to the first groove 6 grooves g6) do not contact.

  The upper surface 20a of the heating element 20 is pushed so that the heating element 20 approaches the bottom surface 11, the inner projecting ring 21a of the heating element 20 is fitted into the first groove 12a in the bottom surface 11, and the outer projecting ring 21b is the second on the bottom surface 11. The first ring a1 to the fifth ring a5 are pushed into the plane between the first groove part 12a and the second groove part 12b on the bottom surface 11 to fit the groove part 12b, and the leading end of the inner protruding ring 21a and the outer protruding ring 21b or the first The grooves g1 to g6 are brought into contact with the bottom surface 11 (pushing step (first fixing), see FIGS. 5 and 12).

  Since the pot body 10 is softer than the heating element 20 (the hardness of the heating element 20 is higher than the hardness of the pot body 10 (at least the bottom surface 11 thereof)), the first ring a1 to the fifth ring a5 are subjected to the pressing step. Bite into the bottom surface 11.

  In 1st Embodiment, although the 1st ring a1-5th ring a5 show the form in which the thickness of a front-end | tip and a root part has the same shape, in order to make it bite into reliably, 1st ring a1-5th ring The form (2nd Embodiment) which has the shape (refer FIG. 17, FIG. 18) where the front-end | tip of a5 was thinly sharp compared with the root part may be sufficient.

  The first crimping jig 51 is fitted into the first space 101, and the second crimping jig 52 is fitted into the third space 103 (fitting process, see FIGS. 6 and 13). In addition, the form by which a heat generating body insertion process and a pushing process are performed after a fitting process may be sufficient.

  With the first caulking jig 51 fitted into the first space 101 and the second caulking jig 52 fitted into the third space 103, the outer peripheral edge portion and the inner peripheral edge portion of the hollow plate shape of the heating element 20 are formed. The first protrusion 11a and the second protrusion 11b are deformed so as to cover the tapered portion, and the heating element 20 inserted into the second space 102 is fixed (caulking process (second fixing), FIG. (See FIG. 14).

  The first caulking jig 51 and the second caulking jig 52 are removed (see the removal process, FIGS. 8 and 15).

  After fixing by caulking, the surfaces of the first protrusion 11a, the heating element 20, the second protrusion 11b, and the third protrusion 11c are flattened (the tips are substantially straight when viewed from the side). (Refer to FIGS. 9 and 16).

  Even after the scraping step, caulking using the first protrusion 11a (a part of the deformed first protrusion 11a covers and fixes the tapered portion of the inner peripheral edge of the heating element 20), The heating element is maintained so that crimping using the second protrusion 11b (part of the deformed second protrusion 11b covers and fixes the tapered portion of the outer peripheral edge of the heating element 20) is maintained. The thickness of 20 and the dimension of the peripheral edge, the height of the first protrusion 11a and the second protrusion 11b, the amount of scraping, and the like are determined.

  In the first embodiment, the top surface of the heating element 20 is pushed, and a plurality of ring-shaped protrusions (the first ring a1 to the fifth ring a5) in the heating element 20 are bitten into the bottom surface 11 of the pan body 10, thereby generating heat. Primary fixing (first fixing) to the bottom surface 11 of the body 20 is performed, and secondary fixing (second fixing) to the bottom surface 11 of the heating element 20 is further performed by caulking.

  For this reason, it is easy to maintain the fixed state of the bottom face 11 and the heat generating body 20 compared with the form which fixes the heat generating body 20 to the bottom face 11 only by caulking without providing the said ring-shaped protrusion.

  Further, since the contact area between the bottom surface 11 and the heating element 20 can be increased by the amount of the plurality of ring-shaped protrusions, the efficiency of heat conduction from the heating element 20 to the pan body 10 can be increased.

  Also, the amount of protrusion (depth) of the ring-shaped projections (the first ring a1 to the fifth ring a5) is increased, the amount of biting into the bottom surface 11 is increased, and the primary fixing is strengthened. Can also be easily done.

  By using the first caulking jig 51 and the second caulking jig 52, there is an advantage that the deformation direction by caulking can be easily guided in a predetermined direction (shape).

  In 1st Embodiment, although the protrusion amount of 1st ring a1-5th ring a5 was demonstrated, the ring (here 5th ring a5) nearest to an outer periphery part is another ring (outer periphery). It is also possible to adopt a form in which the amount of protrusion is larger than that of the ring that is far from the center and close to the center (see FIGS. 17 and 18).

  By increasing the amount of protrusion of the ring close to the peripheral edge, the contact area with the bottom surface 11 can be increased, and heat conduction to the side of the pan body 10 away from the heating element 20 (for example, the side of the pan body 10 is performed). It becomes possible to make it easier.

The inner projecting ring 21a is not limited to the form provided on the inner peripheral edge as shown in the first embodiment, but the side closer to the inner peripheral edge of the heating element 20, for example, the second ring a2 and the third ring The form provided in the position pinched | interposed between the rings a3 may be sufficient (refer 3rd Embodiment and FIGS. 19-28).
Similarly, the outer projecting ring 21b is not limited to the form provided on the outer peripheral edge as shown in the first embodiment, but the side close to the outer peripheral edge of the heating element 20, for example, the third ring a3 and the second ring The form provided in the position pinched | interposed between 4 rings a4 may be sufficient.

  19 to 28, in the lower surface 20b, a first groove g1 is formed between the first ring a1 and the second ring a2, and a second groove a2 is formed between the second ring a2 and the inner protruding ring 21a. A second groove g2 is formed, a third groove g3 is formed between the inner protruding ring 21a and the third ring a3, and a fourth groove g4 is formed between the third ring a3 and the outer protruding ring 21b. An example in which a fifth groove g5 is formed between the outer protruding ring 21b and the fourth ring a4, and a sixth groove g6 is formed between the fourth ring a4 and the fifth ring a5. Indicates.

  In the first embodiment, the form in which the upper surface 20a of the heating element 20 is a flat surface having no protrusions or recesses has been described. However, as shown in the third embodiment, a ring-shaped recess (first recess h1, 2 recesses h2) may be provided.

  19 to 28 show an example in which the concave portion is provided on the upper surface side (the side opposite to the side in contact with the bottom surface) of the inner protruding ring 21a and the outer protruding ring 21b.

  The first ring a1, the second ring a2, the inner protruding ring 21a, the first recess h1, the third ring a3, the outer protruding ring 21b, the second recess h2, the fourth ring a4, and the fifth ring a5 It arrange | positions concentrically centering on the axis | shaft LX which passes along the center of the hole 21c (circle which forms the external shape of an inner peripheral part) formed inside.

When the temperature of the bottom surface of the pan body 10 rises, such as when the cooking device 1 becomes empty, and the heating element 20 expands more than the pan body 10, the opening of the recess becomes narrow (see FIG. 27).
Moreover, when the temperature of the bottom face of the pan body 10 falls, for example, when the cooking device 1 is put in water, and the heating element 20 contracts more than the pan body 10, the bottom face of the recess (opposite the opening, the pan body 10 (The side close to the bottom surface) becomes narrow (see FIG. 28).

  That is, due to the deformation of the concave portion, the expansion difference between the pan body 10 and the heating element 20 is absorbed, and the fixed state of the heating element 20 and the pan body 10 can be easily maintained even when the pot body 10 expands or contracts greatly.

DESCRIPTION OF SYMBOLS 1 Cooker 10 Pan body 11 Bottom surface 11a-11c 1st protrusion part-3rd protrusion part 12a, 12b 1st groove part, 2nd groove part 20 Heating element 20a The upper surface (surface on the side which does not contact a bottom face)
20b Lower surface of heating element (surface on the side in contact with the bottom surface)
21a Inner projecting ring 21b Outer projecting ring 21c Hole 51, 52 First caulking jig, second caulking jig 101-103 First space to third space a1 to a5 First ring to fifth ring g1 to g6 First groove -6th groove h1, h2 1st recessed part, 2nd recessed part LX The axis | shaft which passes along the center of the hole formed inside the inner peripheral edge part

Claims (8)

The pan body,
Having a hardness higher than at least the bottom surface of the pan body, and a heating element attached to the bottom surface,
A plurality of rings protruding toward the bottom surface are integrally formed on the surface of the heating element that contacts the bottom surface,
Among the plurality of rings, the outer peripheral wall of the inner ring is in a positional relationship facing the inner peripheral wall of the outer ring,
The heating element is fixed to the bottom surface by pressing the surface opposite to the surface of the heating element in contact with the bottom surface so that the plurality of rings bite into the bottom surface,
Wherein the surface opposite to the side in contact with the bottom surface of the heating element, for absorbing differential expansion of the heating element and the pot body, electromagnetic induction heating, wherein Rukoto provided a ring-shaped recess Cooker that uses the method. According to claim 1 on a surface opposite to the side in contact with the bottom surface of the projecting ring provided between the ring ring and the outer side of the inner it is characterized in that the ring-shaped recess is provided Cooker. The heating element has a hollow disk shape,
The cooker according to claim 1, wherein the circular shape of the inner peripheral edge of the hollow disc shape and the plurality of rings are arranged concentrically. The pan body,
Having a hardness higher than at least the bottom surface of the pan body, and a heating element attached to the bottom surface,
A plurality of rings protruding toward the bottom surface are integrally formed on the surface of the heating element that contacts the bottom surface,
Among the plurality of rings, the outer peripheral wall of the inner ring is in a positional relationship facing the inner peripheral wall of the outer ring,
The heating element is fixed to the bottom surface by pressing the surface opposite to the surface of the heating element in contact with the bottom surface so that the plurality of rings bite into the bottom surface,
The plurality of rings are arranged concentrically,
The bottom surface is provided with a first protrusion and a second protrusion used to perform the caulking,
The first protrusion has a hollow column shape,
The second protrusion has a hollow column shape surrounding a side surface of the first protrusion,
The heating element is attached between the first protrusion and the second protrusion,
An inner projecting ring provided on the heating element is provided between the first projecting portion and the second projecting portion on the bottom surface and closer to the first projecting portion than the second projecting portion. A first groove to be fitted is provided;
Between the first protrusion and the second protrusion on the bottom surface , closer to the second protrusion than the first protrusion, the heat generating element is closer to the inner protrusion ring . cooker utilizing electromagnetic induction heating system which outer protruding ring provided on the outer side, characterized in that the second groove to be fitted is provided. The pan body,
Having a hardness higher than at least the bottom surface of the pan body, and a heating element attached to the bottom surface,
A plurality of rings protruding toward the bottom surface are integrally formed on the surface of the heating element that contacts the bottom surface,
Among the plurality of rings, the outer peripheral wall of the inner ring is in a positional relationship facing the inner peripheral wall of the outer ring,
The heating element is fixed to the bottom surface by pressing the surface opposite to the surface of the heating element in contact with the bottom surface so that the plurality of rings bite into the bottom surface,
The plurality of rings are arranged concentrically,
The bottom surface is provided with a first protrusion and a second protrusion used to perform the caulking,
The first protrusion has a hollow column shape,
The second protrusion has a hollow column shape surrounding a side surface of the first protrusion,
The heating element is attached between the first protrusion and the second protrusion,
An inner projecting ring provided on the heating element is provided between the first projecting portion and the second projecting portion on the bottom surface and closer to the first projecting portion than the second projecting portion. A first groove to be fitted is provided;
Between the first protrusion and the second protrusion on the bottom surface , closer to the second protrusion than the first protrusion, the heat generating element is closer to the inner protrusion ring. A second groove is provided in which an outer protruding ring provided on the side close to the outer peripheral edge is fitted;
A ring-shaped first recess is provided on a surface opposite to the side in contact with the bottom surface of the inner projecting ring,
A cooker using an electromagnetic induction heating method, characterized in that a ring-shaped second recess is provided on a surface of the outer protruding ring opposite to a side in contact with the bottom surface. The pan body,
Having a hardness higher than at least the bottom surface of the pan body, and a heating element attached to the bottom surface,
A plurality of rings protruding toward the bottom surface are integrally formed on the surface of the heating element that contacts the bottom surface,
Among the plurality of rings, the outer peripheral wall of the inner ring is in a positional relationship facing the inner peripheral wall of the outer ring,
The heating element is fixed to the bottom surface by pressing the surface opposite to the surface of the heating element in contact with the bottom surface so that the plurality of rings bite into the bottom surface,
Among the plurality of rings, a ring closest to the outer peripheral edge has a larger amount of protrusion toward the bottom surface than other rings, and the cooker uses an electromagnetic induction heating method .   The cooker according to claim 1, wherein tips of the plurality of rings have a thin shape as compared with a root portion. A heating element insertion step of inserting a heating element having a hollow plate shape between the protrusions used for caulking provided on the bottom surface of the pan body,
A surface of the heating element that is in contact with the bottom surface, and is formed integrally with a surface of the heating element that contacts the bottom surface, and a plurality of rings protruding toward the bottom surface bite into the bottom surface; A pressing process of pressing the opposite surface;
A caulking step for caulking by deforming the protrusion so as to cover the outer peripheral edge and the inner peripheral edge of the hollow plate shape ,
In the pushing step, a protruding ring provided between the plurality of rings is fitted into a groove provided in the bottom surface,
Wherein on a surface opposite to the side in contact with the bottom surface of the projecting ring, cooker method for producing utilizing electromagnetic induction heating system, wherein Rukoto provided a ring-shaped recess.

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