JP2005296492A - Electromagnetic cooking vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic cooking vessel for securing joining strength of the vessel and a heating plate even if heating/cooling is repeated over a long time. <P>SOLUTION: This electromagnetic cooking vessel has the heating plate 21 for fixing a support shaft 22 and composed of a magnetic material, and the vessel 23 of insert-molding this heating plate 21 and composed of a nonmagnetic material. The support shaft 22 is provided with a locking part 31 for locking the vessel 23 on its side wall 30. Thus, even if the vessel 23 and the heating plate 21 repeat the heating and cooling over a long time, since the locking part 31 is arranged on the support shaft 22, a material of the vessel 23 bites in its part, and the sufficient joining strength can be secured by the anchor effect in the separating direction, and the vessel 23 and the heating plate 21 are integrated, and can be stably used over a long time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic cooking device such as a pan, a frying pan, or a hot platen.

Conventionally, as this kind of electromagnetic cooking utensils, the whole utensil is made of an inexpensive nonmagnetic material excellent in heat conduction, for example, aluminum or its alloy, and a heating plate made of a magnetic material such as stainless steel is positioned on the bottom back surface thereof. What is joined is known (for example, refer to Patent Document 1).
JP-A-11-221161

  However, in the conventional configuration, the container and the heat generating plate are positioned and bonded. However, if heating and cooling are repeated for a long time, the bonding strength between the container and the heat generating plate is inferior, and a gap is generated between the two. When the heat of the heat generating plate that has become high due to induction heating becomes difficult to be transmitted to the main body of the equipment, even if only the temperature of the heat generating plate rises, the temperature of the main body of the equipment does not become high, and the temperature of the main body of the equipment reaches the set temperature. The heat generating plate has a problem that the temperature rises more than necessary.

  An object of the present invention is to solve the conventional problems described above, and an object of the present invention is to provide an electromagnetic cooking utensil that ensures the bonding strength between an utensil and a heating plate even when heating and cooling are repeated for a long time.

  In order to solve the above-mentioned conventional problems, the electromagnetic cooking device of the present invention has a heating plate made of a magnetic material having a support shaft fixed thereto, and a vessel made of a non-magnetic material in which the heating plate is insert-molded. The support shaft is provided with a locking portion for locking the container on the side wall thereof.

  As a result, even if the container and the heating plate are repeatedly heated and cooled for a long time, the support shaft is provided with a locking portion. As a result, sufficient bonding strength can be ensured, and the container and the heating plate can be integrated and used stably for a long time.

  Even if heating and cooling are repeated for a long time, the electromagnetic cooking device of the present invention can secure a sufficient bonding strength between the device and the heating plate, and can be used stably for a long time.

  1st invention has the heat generating plate which consists of a magnetic material which fixed the support shaft, and the instrument which consists of a nonmagnetic material which insert-molded this heat generating plate, and the said support shaft latches the said instrument on the side wall. By using an electromagnetic cooking utensil provided with a locking part, the support shaft is provided with a locking part even if the appliance and the heating plate are repeatedly heated and cooled for a long time. As a result of the anchor effect in the direction of biting and peeling, sufficient bonding strength can be secured, and the container and the heating plate can be integrated and used stably for a long time.

  In the second invention, in particular, in the first invention, the upper end of the support shaft is made the same as the bottom surface of the container, so that when the heat generating plate is inserted into the mold, the position of the heat generating plate is surely secured to the bottom of the container. It can be manufactured in a controlled manner, and the material of the equipment will not wrap around the back side of the heat generating plate, so that the electromagnetic induction will not be interrupted by the material of the material in the middle and will reach the heat generating plate all the way Heating efficiency is improved.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the support shaft has a shape in which the upper surface is pressed downward by the material during casting of the container, so that the support shaft is thermally expanded during insert molding. The phenomenon which swells to the bottom surface side of can be prevented. It is sufficient that the support shaft has a substantially conical shape, a substantially truncated cone shape, or a spherical shape on the upper surface.

  In the fourth invention, in particular, in the first or second invention, the support shaft is made of the same material as the container, so that the temperature rises when the container is heated or when the container is coated. Since the thermal expansion coefficient of the shaft is the same, the container can be prevented from swelling or denting in the vicinity of the support shaft.

  In the fifth aspect of the invention, in particular, in any one of the first to third aspects of the invention, the support shaft is made of a material having a higher purity than the container, so that the support shaft is softer than the container and the support shaft is expanded. This prevents the container from being deformed.

  In the sixth aspect of the invention, in particular, in the first or second aspect of the invention, the support shaft is formed in an acute angle shape with respect to the flow direction of the material during casting, so that the material of the vessel is supported even when flowing at a high pressure. Reduces the resistance that the shaft receives from the material of the object, reduces the stress that the support shaft receives in the mold, prevents the support shaft from becoming thicker, reduces the clamping force of the mold, and is manufactured at low cost can do.

  According to a seventh aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, the number of the support shafts on the side close to the inlet through which the material flows is increased compared to the other side when casting the container. Because the pressure applied to the heat generating plate is high at the part where the flow of the container is touched early, and the pressure applied to the heat generating plate is low at the part where the flow of the container is slow to touch, the heat generating plate is not made uniform. Therefore, it is not necessary to increase the number of support shafts more than necessary.

  In the eighth invention, in particular, in any one of the first to seventh inventions, the heat generating plate is divided into a plurality of concentric circles, so that the distance of expansion when the heat generating plate becomes high is shortened and supported. The stress applied to the shaft is reduced, the thickness of the support shaft can be reduced, and the support shaft can be provided at a low cost.

  In the ninth invention, in particular, in any one of the first to eighth inventions, a part of the heat generating plate protrudes from the outer back surface of the container, so that the heat generating plate comes into contact with the mold. The pressure applied when the material of the container flows is supported by the mold in addition to the support shaft, so that even if the support shaft is thinned or the number of support shafts is reduced, the heat generating plate is stabilized in the mold. be able to.

  In a tenth aspect of the invention, in particular, in any one of the first to ninth aspects, when the heat generating plate is provided with a plurality of opening holes for allowing the material of the container to enter, the heat generating plate is at a high temperature. The deviation of the thermal expansion of the heat generating plate can be suppressed by the material portion of the object that has entered the plurality of opening holes, and the generation of a gap between the object and the heat generating plate can be suppressed.

  In the eleventh aspect of the invention, in particular, in the first aspect of the invention, the support shaft is made larger than the dimension of the attachment portion with the container, so that the heating plate can be securely fixed to the back surface of the container in the mold.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
1 to 4 show an electromagnetic cooking appliance according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a plurality of support shafts 22 are fixed by caulking to a heat generating plate 21 formed by pressing a magnetic material, for example, a stainless steel plate. As shown in FIG. 4, the heat generating plate 21 is formed by casting inserted into the mold 20, and is attached to the equipment bottom 24 of the equipment 23 such as a pan, a frying pan, or a hot plate by joining at a joining surface 25. Yes.

  Here, the material of the container 23 is made of a nonmagnetic material that is cheaper and has better thermal conductivity than stainless steel, for example, aluminum or an alloy thereof.

  As shown in FIG. 2, the support shaft 22 is fixed to the heat generating plate 21 by caulking and inserting a lower convex portion 29 into a hole 28 provided in the heat generating plate 21, The surface of the plate 21 is the same plane. Further, the side wall 30 of the support shaft 22 is provided with a locking portion 31 including a concave portion for locking the object 23. As shown in FIG. 3, a plurality of the support shafts 22 are equally provided on the heat generating plate 21.

  In FIG. 4, when the heat generating plate 21 with the support shaft 22 fixed by caulking is inserted into the mold 20 and the container 23 is cast, the lower surface of the heat generating plate 21 and the front end surface of the convex portion 29 of the support shaft 22 are The bottom surface 26 and the bottom surface 26 are flush with each other. An upper wall 32 of the container 23 is provided on the upper end of the support shaft 22 so that the upper end of the support shaft 22 does not protrude from the bottom surface 27 of the container 23.

  Further, the heat generating plate 21 is flush with the container bottom 33 on the outer periphery of the heat generating plate 21. Further, on the outer periphery of the bowl bottom 33, there are provided legs 34 that allow the heating plate 21 to provide a distance from the cooker body when the bowl 23 is placed on the cooker body.

  The operation | movement and effect | action are demonstrated below about the electromagnetic cooking appliance comprised as mentioned above.

  When the container 23 is placed on an induction heating cooker and induction heated, only the heat generating plate 21 made of magnetic material is heated. Since the heat generating plate 21 and the container bottom 24 are joined by the joint surface 25, the heat of the heat generating plate 21 is transmitted to the container bottom 24, and the temperature of the bottom surface 27 rises so that cooking can be performed.

  At this time, since the container 23 is formed of a material having good thermal conductivity, the heat of the heat generating plate 21 is transmitted from the container bottom 24 to the entire surface of the container bottom 24, and the entire container 23 generates heat.

  Further, when the heating plate 21 and the container 23 are heated, since they are dissimilar metals, the coefficients of thermal expansion are different, and stress is generated at the joint surface 25 to cause separation. Since a plurality of support shafts 22 are embedded in the container bottom 24, the stress between the heat generating plate 21 and the container bottom 24 can be suppressed, and deviation can be prevented. As for the stress in the vertical direction of the container bottom 24, when the heating plate 21 is restricted from extending in the horizontal direction, it tends to warp downward, but the locking portion provided on the side wall 30 of the support shaft 22 31 is configured such that the material of the container 23 enters, so that the stress that the support shaft 22 tends to come off from the container bottom 24 is suppressed by the undercut shape of the locking portion 31, and the support shaft 22 can be easily removed from the container bottom 24. To avoid misalignment. Thereby, the heat generating plate 21 can prevent a gap or the like from being generated at the joint surface 25.

  Moreover, since the thermal expansion coefficient of the container 23 and the support shaft 22 is the same because the support shaft 22 is made of the same material as that of the container 23, the temperature rises when the container 23 is heated or when the container 23 is coated. The container 23 can be prevented from being swollen or dented in the vicinity of the support shaft 22. Furthermore, by forming the support shaft 22 at the same time as casting the container 23, the number of molding steps can be reduced, and the container can be provided at a low cost.

  Furthermore, the container 23 is made of an aluminum alloy, and the material of the support shaft 22 is aluminum and the material has a higher purity than that of the container 23, so that the support shaft 22 becomes softer than the container 23, and the container 23 is supported at a high temperature. It is possible to prevent the shape of the container bottom 24 from being deformed by the expansion of the shaft 22 due to the temperature rise. Further, the bottom back surface 26 of the container 23 is floated by the legs 34 when placed on the main body of the cooker, so that the heat generating plate 21 is not impacted and the heat generating plate 21 is integrated with the container bottom 24. Even if it is slightly warped, the stability is not inferior because there is a gap.

  Even if a nonmagnetic stainless material is used for the heat generating plate 21, substantially the same effect can be obtained. In addition, iron materials or materials obtained by applying aluminum plating or zinc plating to steel can also be used. Further, although the support shaft 22 is fixed to the heat generating plate 21 by caulking, the support shaft 22 may be provided with a screw, the hole 28 of the heat generating plate 21 may be subjected to burring, and the screw may be provided.

(Embodiment 2)
FIG. 5 shows a main part of the electromagnetic cooking appliance according to Embodiment 2 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the present embodiment, the lower portion of the support shaft 37 is inserted into the hole 28 provided in the heat generating plate 21 and fixed by caulking. The support shaft 37 is buried in the interior of the container bottom 24 and cast. Further, as in the first embodiment, the support shaft 37 is provided with a locking portion 39 on the side wall 38. The upper end of the support shaft 37 is the same as the bottom surface 27 of the container 23.

  Regarding the electromagnetic cooking utensil configured as described above, the support shaft 37 comes into contact with both surfaces of the mold 20 when the heating plate 21 to which the support shaft 22 is fixed is inserted into the mold 20. For this reason, even if the casting material of the container 23 flows into the mold 20 at a high pressure and the heat generating plate 21 and the support shaft 37 are subjected to stress due to the material flow, the support shaft 37 is supported by the mold 20. The position of the heat generating plate 21 can be reliably regulated to the bottom of the container 23 without being displaced.

  Further, by supporting the support shaft 22 on both sides of the mold 20, the lower surface of the heat generating plate 21 is less likely to float from the surface of the mold 20, and the material of the container 23 flows under the heat generating plate 21 when the material flows into the mold. The material can be prevented from wrapping around. Thereby, electromagnetic induction is not interrupted by the material of the container 23 in the middle, and reaches all of the heat generating plate 21 to improve induction heating efficiency.

(Embodiment 3)
6 and 7 show the main part of an electromagnetic cooking utensil according to Embodiment 3 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In FIG. 6, the support shaft 40 has an upper surface 42 having a substantially frustoconical shape so that the material 23 is pressed downward by the material at the time of casting, so that the support shaft 40 is thermally expanded at the time of insert molding. This prevents the phenomenon of swelling toward the bottom surface 27 side. That is, the temperature of the support shaft 40 becomes 700 ° C. or higher when the container 23 is insert-molded, and the temperature rises more than when the container 23 is cooked, but the upper surface 42 of the support shaft 40 is substantially truncated cone. Due to the shape, when the material flows in the lateral direction in the vicinity 43 of the support shaft 40, the upper surface 42 of the support shaft 40 receives a pressure that is pressed downward, and can prevent the phenomenon of swelling upward. . The anchor effect at the locking portion 41 of the support shaft 40 is the same as in the first embodiment.

  In FIG. 7, the support shaft 44 is provided with a locking portion 45 on the side wall, the upper surface 46 has a substantially truncated cone shape, and the upper portion of the upper surface 46 has a small area on the bottom surface 27 of the container bottom 24. Appears.

  For the electromagnetic cooking utensils configured as described above, when the material flows in the lateral direction in the vicinity 47 of the support shaft 44, the same effect as in FIG. 6 is obtained and the support shaft 44 is fixed by caulking. When the heat generating plate 21 is inserted into the mold 20, the support shaft 44 is supported on both surfaces of the mold 20, so that the heat generating plate 21 can be fixed in the mold 20. In addition, since the area where the support shaft 44 is exposed on the surface of the container bottom 24 is small, even if the material of the support shaft 44 is an inexpensive aluminum alloy grade, it hardly swells due to thermal expansion, and the container 23 can be made at low cost. Can do.

  Here, the same effect can be obtained by making the upper surfaces 42 and 46 of the support shafts 40 and 44 into a substantially conical shape, a spherical shape or the like in addition to the substantially truncated cone shape.

(Embodiment 4)
FIG. 8 shows a main part of an electromagnetic cooking utensil according to Embodiment 4 of the present invention.

  In the present embodiment, the container 50 is formed by casting, and the material flows as indicated by an arrow from the gate 51 through which the material flows during casting. At that time, the heating element 53 is attached in the mold, but a plurality of support shafts 54 are fixed to the heating plate 53. The casting of the container 50 is the same as in the first embodiment.

  Here, the support shaft 54 has a triangular shape as viewed from above at the upper part corresponding to the position buried in the bottom of the container, and the acute angle shape 55 faces the material flow direction 52.

  In the electromagnetic cooking utensil configured as described above, even if the material of the container 50 is flowed at a high pressure in a short time, the resistance that the support shaft 54 receives from the flow of the material of the container 50 can be reduced. Less stress in the mold. As a result, the support shaft 54 can be thinned to reduce the material cost, and the molding time can be shortened, so that it can be manufactured at low cost.

(Embodiment 5)
FIG. 9 shows a main part of the electromagnetic cooking appliance according to Embodiment 5 of the present invention.

  In the present embodiment, the support shaft 59 of the heat generating plate 58 is obtained by increasing the number of sides closer to the inlet 57 through which the material 56 flows when compared with the other side.

  As a result, the pressure applied to the heat generating plate 58 is high at the entrance 57 portion where the flow of the container 56 touches quickly, and the heat generating plate 58 is likely to be displaced or deformed. However, by increasing the number of the support shafts 59, It is possible to prevent deformation due to such pressure. Since the pressure applied to the heat generating plate 56 is low at a position away from the entrance 57 where the flow of the container 56 is slow to touch, it is not necessary to increase the number of support shafts 59 more than necessary.

  In this way, by not making the number of support shafts 59 uniform, the position of the heat generating plate 56 can be regulated stably, and it is not necessary to increase the number of support shafts 59 more than necessary, and performance and cost reduction are realized. can do.

(Embodiment 6)
FIG. 10 shows a main part of an electromagnetic cooking appliance according to Embodiment 6 of the present invention.

  In the present embodiment, the heat generating plate insert-molded in the container 60 is divided into an inner heat generating plate 61 and an outer heat generating plate 62 concentrically, and a plurality of support shafts 63 are fixed to the respective heat generating plates 61 and 62. Is. The heat generating plate may be divided into three or more.

  In the electromagnetic cooking device configured as described above, even if the heat generating plates 61 and 62 become high temperature, the width of the heat generating plate is substantially halved, so the distance that changes due to thermal expansion at high temperature and normal temperature is short. Become. For this reason, the stress applied to the support shaft 63 is reduced, the thickness of the support shaft 63 can be reduced, and the support shaft 63 can be produced at low cost.

(Embodiment 7)
FIG. 11 shows a main part of the electromagnetic cooking appliance according to Embodiment 7 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the present embodiment, a part of the thickness of the end surface 65 of the heat generating plate 21 is covered with the container bottom 33, and a part of the heat generating plate 21 is protruded from the bottom rear surface 26 of the container 23.

  In the electromagnetic cooking utensil configured as described above, a part of the heat generating plate 21 abuts on the mold, so that the pressure received when the material of the utensil 23 flows is supported by the mold in addition to the support shaft 22. Even if the support shaft 22 is made thin or the number of the support shafts 22 is reduced, the heat generating plate 21 can be stabilized in the mold.

  In the present embodiment, a part of the thickness of the end face 65 of the heat generating plate 21 protrudes from the bottom back surface 26 of the container 23. However, a protrusion is provided on a part of the heat generating plate 21 to contact the mold. Even if it does, the same effect is acquired.

(Embodiment 8)
12 and 13 show the main part of an electromagnetic cooking utensil according to Embodiment 8 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the present embodiment, the heating plate 21 is provided with a plurality of opening holes 68 for allowing the material of the container 23 to enter.

  In the electromagnetic cooking utensil configured as described above, since the material of the utensil 23 is contained in the plurality of opening holes 68 of the heating plate 21, the heat of the heating plate 21 when the heating plate 21 becomes high temperature. In addition to the support by the support shaft 22, the displacement of the expansion can be suppressed by the material portion of the opening hole 68, and the generation of a gap between the container 23 and the heating plate 21 can be suppressed.

(Embodiment 9)
FIG. 14 shows a main part of an electromagnetic cooking utensil according to Embodiment 9 of the present invention.

  In the present embodiment, the overall dimension A of the support shaft 71 of the heat generating plate 21 is larger than the dimension B of the attachment portion with the container 23.

  In the electromagnetic cooking device configured as described above, when the heat generating plate 21 to which the support shaft 71 is attached is inserted into the mold, the overall dimension A of the support shaft 71 is larger than the attachment portion dimension B of the support shaft 71. Therefore, the heat generating plate 21 can be reliably fixed to the bottom back surface of the container 23 in the mold.

  Note that the configurations of the above-described first to ninth embodiments can be used in appropriate combinations as needed, and are not limited to the embodiments themselves.

  As described above, the electromagnetic cooking utensil according to the present invention can ensure sufficient bonding strength between the utensil and the heating plate even if heating and cooling are repeated for a long time, and can be used stably for a long time. It can also be used for cooking, such as frying pans, flat plates for grilled meat, grooved plates for grilled meat, perforated plates, tempura dishes, or cheese fondue, shabu-shabu, sukiyaki. Further, since the heating plate is hardly cracked by heating, it is possible to provide a cooking device that can be used not only for a 100V power source for home use but also for a 200V high power device for kitchen use. Moreover, it can expand | deploy for business use by making the equipment of a cast instrument rigid.

Sectional drawing of the electromagnetic cooking appliance in Embodiment 1 of this invention Partial sectional view of the support shaft and heating plate of the same electromagnetic cooking utensil Top view of the heating plate of the same electromagnetic cooking utensil Partial sectional view showing the casting state of the electromagnetic cooking utensil Sectional drawing of the principal part of the electromagnetic cooking appliance in Embodiment 2 of this invention Sectional drawing of the principal part of an example of the electromagnetic cooking appliance in Embodiment 3 of this invention Main part sectional drawing of other examples of the same electromagnetic cooking utensils The back view of the electromagnetic cooking appliance in Embodiment 4 of this invention The back view of the electromagnetic cooking appliance in Embodiment 5 of this invention The back view of the electromagnetic cooking appliance in Embodiment 6 of this invention Sectional drawing of the principal part of the electromagnetic cooking appliance in Embodiment 7 of this invention The top view of the heat generating plate of the electromagnetic cooking appliance in Embodiment 8 of this invention Cross-sectional view of the main part of the electromagnetic cooking utensil Sectional drawing of the principal part of the electromagnetic cooking appliance in Embodiment 9 of this invention

Explanation of symbols

20 type 21, 53, 58, 61, 62 Heating plate 22, 37, 40, 44, 54, 59, 63, 71 Support shaft 23, 50, 56, 60 Equipment 24 Equipment bottom 25 Joint surface 26 Bottom back surface 27 Bottom surface 30 Side wall 31, 39, 41, 45 Locking part 33 Container bottom part 55 Sharp angle shape 68 Opening hole

Claims (11)

A heating plate made of a magnetic material with a support shaft fixed thereto, and a container made of a non-magnetic material in which the heating plate is insert-molded. The support shaft has a locking portion for locking the tool on its side wall. Electric cooking equipment. The electromagnetic cooking appliance according to claim 1, wherein the upper end of the support shaft is the same as the bottom surface of the appliance. The electromagnetic cooking appliance according to claim 1 or 2, wherein the support shaft has a shape whose upper surface is pressed downward by the material when casting the appliance. The electromagnetic cooking appliance according to claim 1 or 2, wherein the support shaft is made of the same material as the appliance. The electromagnetic cooking appliance according to any one of claims 1 to 3, wherein the support shaft is made of a material having a higher purity than the appliance. The electromagnetic cooking appliance according to claim 1 or 2, wherein the support shaft has an acute shape with respect to a direction in which the material flows when the appliance is cast. The electromagnetic cooking appliance according to any one of claims 1 to 6, wherein the support shaft has an increased number of sides closer to an inlet through which the material flows when compared to the other side. The electromagnetic cooking appliance according to any one of claims 1 to 7, wherein the heat generating plate is divided into a plurality of concentric circles. The electromagnetic cooking appliance according to any one of claims 1 to 8, wherein a part of the heating plate is protruded from the outer back surface of the appliance. The electromagnetic cooking appliance according to any one of claims 1 to 9, wherein the heating plate is provided with a plurality of opening holes for allowing the ingredients of the appliance to enter. The electromagnetic cooking appliance according to claim 1, wherein the support shaft is larger than a size of an attachment portion with the appliance.

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